发表3 分钟读完 (大约482个字)

Problems专题之Gradle

Problems专题之Gradle

0x01 More than one file was found with OS independent path ‘META-INF/webview_release.kotlin_module’

这是因为第三方库中存在很多重名的META-INF文件，在打包的时候去除即可

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android {
  // ...
  packagingOptions {
      exclude 'META-INF/webview_release.kotlin_module'
      exclude 'META-INF/proguard/androidx-annotations.pro'
      exclude 'META-INF/gradle/incremental.annotation.processors'
      exclude 'META-INF/DEPENDENCIES'
      exclude 'META-INF/LICENSE'
      exclude 'META-INF/LICENSE.txt'
      exclude 'META-INF/license.txt'
      exclude 'META-INF/NOTICE'
      exclude 'META-INF/NOTICE.txt'
      exclude 'META-INF/notice.txt'
      exclude 'META-INF/ASL2.0'
      // ...
  }
}

0x02 Certificate for <x.x.x> doesn’t match any of the subject alternative names

在执行gradlew命令打包时遇到这个错误，肯定是https证书有问题。

解决方案：如果支持http的话就使用http

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> Could not resolve com.bytedanceapi:ttsdk-ttmp:1.36.2.25.pcdn.
   Required by:
      project :player > com.bytedanceapi:ttsdk-player_premium:1.36.2.25.pcdn > com.bytedanceapi:ttsdk-ttplayer:1.36.2.25.pcdn
   > Could not resolve com.bytedanceapi:ttsdk-ttmp:1.36.2.25.pcdn.
      > Could not get resource 'https://artifact.bytedance.com/repository/Volcengine/com/bytedanceapi/ttsdk-ttmp/1.36.2.25.pcdn/ttsdk-ttmp-1.36.2.25.pcdn.pom'.
         > Could not GET 'https://artifact.bytedance.com/repository/Volcengine/com/bytedanceapi/ttsdk-ttmp/1.36.2.25.pcdn/ttsdk-ttmp-1.36.2.25.pcdn.pom'.
            > Certificate for <artifact.bytedance.com> doesn't match any of the subject alternative names: [*.alicdn.com, *.cmos.greencompute.org, cmos.greencompute.org, m.intl.taob
ao.com, *.mobgslb.tbcache.com, alikunlun.com, *.alikunlun.com, s.tbcdn.cn, *.django.t.taobao.com, alicdn.com]

把项目根目录的build.gradle文件中所有的https://artifact.bytedance.com/替换为http://artifact.bytedance.com/即可

Ox03 module java.base does not “opens java.io” to unnamed module

升级到 Java 16 以上，AndroidStudio编译遇到错误。

Unable to make field private final java.lang.String java.io.File.path accessible: module java.base does not “opens java.io” to unnamed module @fb04536

解决方案一：

  1. 将 gradle-wrapper 属性中的 gradle 版本更改为 7.1.1（6.x 不支持 java 16）
  2. 在 gradle.properties 中添加以下行
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org.gradle.jvmargs=-Xmx1536m \
--add-exports=java.base/sun.nio.ch=ALL-UNNAMED \
--add-opens=java.base/java.lang=ALL-UNNAMED \
--add-opens=java.base/java.lang.reflect=ALL-UNNAMED \
--add-opens=java.base/java.io=ALL-UNNAMED \
--add-exports=jdk.unsupported/sun.misc=ALL-UNNAMED

解决方案二：

升级build-gradlew版本。 将项目根目录的 build.gradle文件中
classpath 'com.android.tools.build:gradle:4.2.2'
升级为
classpath 'com.android.tools.build:gradle:7.2.1'

发表2 分钟读完 (大约235个字)

Problems专题：Provider

Problems专题：Provider

0x01 FileProvider：Failed to find configured root that contains /…/**.jpeg

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java.lang.IllegalArgumentException: Failed to find configured root that contains /storage/emulated/0/DCIM/Camera/**.jpeg
	at androidx.core.content.FileProvider$SimplePathStrategy.getUriForFile(FileProvider.java:800)
	at androidx.core.content.FileProvider.getUriForFile(FileProvider.java:442)
	at com.luck.picture.lib.tools.PictureFileUtils.parUri(PictureFileUtils.java:533)
	at com.luck.picture.lib.PictureBaseActivity.startOpenCameraImage(PictureBaseActivity.java:705)
	at com.luck.picture.lib.PictureSelectorActivity.startCamera(PictureSelectorActivity.java:926)
	at com.luck.picture.lib.PictureSelectorActivity.onTakePhoto(PictureSelectorActivity.java:1473)
	at com.luck.picture.lib.adapter.PictureImageGridAdapter.lambda$onBindViewHolder$0$PictureImageGridAdapter(PictureImageGridAdapter.java:155)
	at com.luck.picture.lib.adapter.-$$Lambda$PictureImageGridAdapter$0EODmJcP4VP0lqmkEhQ1dzLbHi8.onClick(Unknown Source:2)
	at android.view.View.performClick(View.java:6608)
	at android.view.View.performClickInternal(View.java:6585)
	at android.view.View.access$3100(View.java:785)
	at android.view.View$PerformClick.run(View.java:25921)
	at android.os.Handler.handleCallback(Handler.java:873)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:201)
	at android.app.ActivityThread.main(ActivityThread.java:6810)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
Back traces end.

问题分析

  1. FileProvider 路径配置文件被互相覆盖
  2. FileProvider 路径配置文件id重复，导致覆盖

解决方案

发表4 分钟读完 (大约635个字)

Problems专题：编译环境

Problems专题：编译环境

0x01 java.lang.AssertionError: Could not delete caches dir

CreateProcess error=206, El nombre del archivo o la extensión es demasiado largo

Caused by: java.lang.AssertionError: Could not delete caches dir YourProjectPath\build\kotlin\compileDebugTestingKotlin

临时解决

打开任务管理器，结束 java.exe 或者 OpenJDK Platform Binary

降级 Android Studio

Notice: This happens with the newer AndroidStudio 4.2.x.

Google hasn’t provide us a fix, so you’ll need to downgrade to an older version which works for you. 4.1.3 seems to be working fine.

参考链接：https://stackoverflow.com/questions/65832868/caused-by-java-lang-assertionerror-could-not-delete-caches-dir-yourproject-bui

0x02 Please close other application using ADB:Monitor, DDMS, Eclip

Warning:debug info can be unavailable. Please close other application using ADB:Monitor, DDMS, Eclipse.

方案一：

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$ adb usb

方案二：

打开任务管理器，结束adb.exe进程。

方案三：

重启 adb 服务

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$ adb kill-server
$ adb start-server

0x03 能安装apk却无法查看log[真机偶现]

能安装apk却无法在Logcat查看log，即使重启Android studio，重启adb服务都无法解决。最后通过重启手机搞定

0x04 platform-tools/api/api-versions.xml java.io.IOException: Stream closed

在 android studio 更新到 v2020.3.1 后遇到

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cannot load api descriptions from ../Android/android-sdk/platform-tools/api/api-versions.xml java.io.IOException: Stream closed

问题的原因与类SdkUtils (请参阅the source file)相关。SdkUtils类具有对文件platform-tools/api/api-versions.xml的硬引用，但是在最新的平台工具(31.0.3)中，该文件不再存在。

从platforms/android-31/data/api-versions.xml复制文件到platform-tools/api/api-versions.xml。

如果是CI编译，可以尝试以下脚本：

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steps:
  - bash: |
    echo Android sdk location: $ANDROID_SDK_ROOT
    mkdir $ANDROID_SDK_ROOT/platform-tools/api/
    cp $ANDROID_SDK_ROOT/platforms/android-30/data/api-versions.xml $ANDROID_SDK_ROOT/platform-tools/api/

0x05 Installed Build Tools revision 31.0.0 is corrupted. Remove and install again using the SDK Manager.

升级android sdk api 版本到31，适配android 12 ，遇到这个问题。当前开发环境：

android studio 版本： 2020.3.1

AGP 版本： 4.1.2 （classpath "com.android.tools.build:gradle:4.1.2"）

SDK 版本

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android {
  compileSdkVersion 31
  buildToolsVersion '31.0.0'

  defaultConfig {
      minSdkVersion 21
      targetSdkVersion 31
  }
}

SDK Manager更新对应版本都正常下载，编译过程出现异常

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Installed Build Tools revision 31.0.0 is corrupted. Remove and install again using the SDK Manager.

是 Build Tools 升级之后，DX 变成了 D8。而 AGP 4.x 的版本使用的还是DX。

解决的方案：

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# change below to your Android SDK path
cd ~/Library/Android/sdk/build-tools/31.0.0 \
  && mv d8 dx \
  && cd lib  \
  && mv d8.jar dx.jar

将 C:\Users\user\AppData\Local\Android\Sdk\build-tools\31.0.0\d8.bat 改为 dx.bat
将 C:\Users\user\AppData\Local\Android\Sdk\build-tools\31.0.0\lib\d8.jar 改为 dx.jar

PS:也可以尝试升级 AGP 到 7.x

发表13 分钟读完 (大约1985个字)

Problems专题：ViewPager2

ViewPager2

0x01 FragmentManager is already executing transactions

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java.lang.IllegalStateException: FragmentManager is already executing transactions
	at androidx.fragment.app.FragmentManager.ensureExecReady(FragmentManager.java:1778)
	at androidx.fragment.app.FragmentManager.execSingleAction(FragmentManager.java:1814)
	at androidx.fragment.app.BackStackRecord.commitNow(BackStackRecord.java:297)

	at androidx.viewpager2.adapter.FragmentStateAdapter.removeFragment(FragmentStateAdapter.java:464)
	at androidx.viewpager2.adapter.FragmentStateAdapter.gcFragments(FragmentStateAdapter.java:228)
	at androidx.viewpager2.adapter.FragmentStateAdapter.restoreState(FragmentStateAdapter.java:569)
	at androidx.viewpager2.widget.ViewPager2.restorePendingState(ViewPager2.java:350)
	at androidx.viewpager2.widget.ViewPager2.dispatchRestoreInstanceState(ViewPager2.java:375)

	at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3829)
	at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3829)
	at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3829)
	at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3829)
	at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3829)

	at android.view.View.restoreHierarchyState(View.java:18613)

	at androidx.fragment.app.Fragment.restoreViewState(Fragment.java:573)
	at androidx.fragment.app.FragmentStateManager.restoreViewState(FragmentStateManager.java:356)
	at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1189)
	at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1356)
	at androidx.fragment.app.FragmentManager.moveFragmentToExpectedState(FragmentManager.java:1434)
	at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1497)
	at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2625)
	at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:2577)

	at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:247)

	at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:541)
	at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:210)
	at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1392)
	at android.app.Activity.performStart(Activity.java:7260)
	at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3009)

	at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:180)
	at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:165)
	at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:142)
	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:70)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1840)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loop(Looper.java:207)
	at android.app.ActivityThread.main(ActivityThread.java:6878)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:876)

解决方案

如果在 Fragment 中使用 ViewPager2，那么 FragmentStateAdapter 应该使用 childFragmentManager。将

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FragmentStateAdapter viewPagerAdapter = new FragmentStateAdapter(getActivity().getSupportFragmentManager(), titles);

改为

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FragmentStateAdapter viewPagerAdapter = new FragmentStateAdapter(getChildFragmentManager(), titles);

0x02 ViewPager2+FragmentStateAdapter 的 notifyDataSetChanged 方法失效

原因分析：

因为 FragmentStateAdapter 会保存所有 Fragment 实例，当调用 Adapter.notifyDataSetChanged() 方法时，Fragment 并没有走 onCreate 方法。

解决方案：

方案一（这个方法会导致内存泄漏，不推荐）

在调用 notifyDataSetChanged 之前，清空 FragmentStateAdapter 的 Fragment 列表。

方案二

重写 getItemId() containsItem() 这两个方法，并确保 getItemId() 的值是唯一的。

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override fun createViewPagerAdapter(): RecyclerView.Adapter<*> {
    val items = items // avoids resolving the ViewModel multiple times
    return object : FragmentStateAdapter(this) {
        override fun createFragment(position: Int): PageFragment {
            val itemId = items.itemId(position)
            val itemText = items.getItemById(itemId)
            return PageFragment.create(itemText)
        }
        override fun getItemCount(): Int = items.size
        override fun getItemId(position: Int): Long = items.itemId(position)
        override fun containsItem(itemId: Long): Boolean = items.contains(itemId)
    }
}

/** A very simple collection of items. Optimized for simplicity (i.e. not performance). */
class ItemsViewModel : ViewModel() {
    private var nextValue = 1L

    private val items = (1..9).map { longToItem(nextValue++) }.toMutableList()

    fun getItemById(id: Long): String = items.first { itemToLong(it) == id }
    fun itemId(position: Int): Long = itemToLong(items[position])
    fun contains(itemId: Long): Boolean = items.any { itemToLong(it) == itemId }
    fun addNewAt(position: Int) = items.add(position, longToItem(nextValue++))
    fun removeAt(position: Int) = items.removeAt(position)
    fun createIdSnapshot(): List<Long> = (0 until size).map { position -> itemId(position) }
    val size: Int get() = items.size

    private fun longToItem(value: Long): String = "item#$value"
    private fun itemToLong(value: String): Long = value.split("#")[1].toLong()
}

0x03 Design assumption violated

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java.lang.IllegalStateException: Design assumption violated.
    at androidx.viewpager2.widget.ViewPager2.updateCurrentItem(ViewPager2.java:538)
    at androidx.viewpager2.widget.ViewPager2$4.onAnimationsFinished(ViewPager2.java:518)
    at androidx.recyclerview.widget.RecyclerView$ItemAnimator.isRunning(RecyclerView.java:13244)
    at androidx.viewpager2.widget.ViewPager2.onLayout(ViewPager2.java:515)
    at android.view.View.layout(View.java:15596)

解决方案：

如果重写了 getItemId() containsItem() 这两个方法，确保 getItemId() 的值是唯一的。代码同 0x02

0x04 ViewPager2 嵌套 RecyclerView 手势冲突问题

img

原因分析：

同方向滚动事件被 ViewPager2 拦截了。

解决方案：

方案一 自定义 NestedScrollableHost

采用官方提供的自定义 NestedScrollableHost 来包一层 RecyclerView

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import android.content.Context
import android.util.AttributeSet
import android.view.MotionEvent
import android.view.View
import android.view.ViewConfiguration
import android.widget.FrameLayout
import androidx.viewpager2.widget.ViewPager2
import androidx.viewpager2.widget.ViewPager2.ORIENTATION_HORIZONTAL
import kotlin.math.absoluteValue
import kotlin.math.sign

/**
 * Layout to wrap a scrollable component inside a ViewPager2. Provided as a solution to the problem
 * where pages of ViewPager2 have nested scrollable elements that scroll in the same direction as
 * ViewPager2. The scrollable element needs to be the immediate and only child of this host layout.
 *
 * This solution has limitations when using multiple levels of nested scrollable elements
 * (e.g. a horizontal RecyclerView in a vertical RecyclerView in a horizontal ViewPager2).
 */
class NestedScrollableHost : FrameLayout {
    constructor(context: Context) : super(context)
    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)

    private var touchSlop = 0
    private var initialX = 0f
    private var initialY = 0f
    private val parentViewPager: ViewPager2?
    get() {
        var v: View? = parent as? View
        while (v != null && v !is ViewPager2) {
            v = v.parent as? View
        }
        return v as? ViewPager2
    }

    private val child: View? get() = if (childCount > 0) getChildAt(0) else null

    init {
        touchSlop = ViewConfiguration.get(context).scaledTouchSlop
    }

    private fun canChildScroll(orientation: Int, delta: Float): Boolean {
        val direction = -delta.sign.toInt()
        return when (orientation) {
            0 -> child?.canScrollHorizontally(direction) ?: false
            1 -> child?.canScrollVertically(direction) ?: false
            else -> throw IllegalArgumentException()
        }
    }

    override fun onInterceptTouchEvent(e: MotionEvent): Boolean {
        handleInterceptTouchEvent(e)
        return super.onInterceptTouchEvent(e)
    }

    private fun handleInterceptTouchEvent(e: MotionEvent) {
        val orientation = parentViewPager?.orientation ?: return

        // Early return if child can't scroll in same direction as parent
        if (!canChildScroll(orientation, -1f) && !canChildScroll(orientation, 1f)) {
            return
        }

        if (e.action == MotionEvent.ACTION_DOWN) {
            initialX = e.x
            initialY = e.y
            parent.requestDisallowInterceptTouchEvent(true)
        } else if (e.action == MotionEvent.ACTION_MOVE) {
            val dx = e.x - initialX
            val dy = e.y - initialY
            val isVpHorizontal = orientation == ORIENTATION_HORIZONTAL

            // assuming ViewPager2 touch-slop is 2x touch-slop of child
            val scaledDx = dx.absoluteValue * if (isVpHorizontal) .5f else 1f
            val scaledDy = dy.absoluteValue * if (isVpHorizontal) 1f else .5f

            if (scaledDx > touchSlop || scaledDy > touchSlop) {
                if (isVpHorizontal == (scaledDy > scaledDx)) {
                    // Gesture is perpendicular, allow all parents to intercept
                    parent.requestDisallowInterceptTouchEvent(false)
                } else {
                    // Gesture is parallel, query child if movement in that direction is possible
                    if (canChildScroll(orientation, if (isVpHorizontal) dx else dy)) {
                        // Child can scroll, disallow all parents to intercept
                        parent.requestDisallowInterceptTouchEvent(true)
                    } else {
                        // Child cannot scroll, allow all parents to intercept
                        parent.requestDisallowInterceptTouchEvent(false)
                    }
                }
            }
        }
    }
}

对应的 layout 代码：

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical">
... 水平
    <androidx.viewpager2.integration.testapp.NestedScrollableHost
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="8dp">
        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/first_rv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="#FFFFFF" />
    </androidx.viewpager2.integration.testapp.NestedScrollableHost>
 ... 竖直
    <androidx.viewpager2.integration.testapp.NestedScrollableHost
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_marginLeft="20dp"
        android:layout_marginRight="20dp"
        android:layout_marginTop="8dp"
        android:layout_weight="1">
        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/second_rv"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#FFFFFF" />
    </androidx.viewpager2.integration.testapp.NestedScrollableHost>

</LinearLayout>

方案二 自定义 RecyclerView

自定义 NestedRecyclerView 的分发事件通过 requestDisallowInterceptTouchEvent() 方法来限制父布类的拦截事件

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public class NestedRecyclerView extends RecyclerView {
    public NestedRecyclerView(@NonNull Context context) {
        super(context);
    }
    public NestedRecyclerView(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }
    public NestedRecyclerView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }

    private int startX, startY;

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                startX = (int) ev.getX();
                startY = (int) ev.getY();
                getParent().requestDisallowInterceptTouchEvent(true);
                break;
            case MotionEvent.ACTION_MOVE:
                int endX = (int) ev.getX();
                int endY = (int) ev.getY();
                int disX = Math.abs(endX - startX);
                int disY = Math.abs(endY - startY);

                if (disX > disY) {
                    getParent().requestDisallowInterceptTouchEvent(canScrollHorizontally(startX - endX));
                } else {
                    getParent().requestDisallowInterceptTouchEvent(canScrollVertically(startX - endX));
                }
                break;
            case MotionEvent.ACTION_UP:
            case MotionEvent.ACTION_CANCEL:
                getParent().requestDisallowInterceptTouchEvent(false);
                break;
        }
        return super.dispatchTouchEvent(ev);
    }
}

方法三 使用 ViewPager

降级，使用 ViewPager 来嵌套 RecyclerView ，可以避免事件冲突，亲测有效。

0x05 ViewPager2 两边保留上一页预览

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import android.os.Bundle
import android.view.LayoutInflater
import android.view.ViewGroup
import android.widget.Toast
import androidx.fragment.app.FragmentActivity
import androidx.recyclerview.widget.RecyclerView
import androidx.viewpager2.widget.ViewPager2

class PreviewPagesActivity : FragmentActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_viewpager2)
        findViewById<ViewPager2>(R.id.view_pager).apply {
            // Set offscreen page limit to at least 1, so adjacent pages are always laid out
            offscreenPageLimit = 1
            val recyclerView = getChildAt(0) as RecyclerView
            recyclerView.apply {
                clipToPadding = false
                val leftPadding = resources.getDimensionPixelOffset(R.dimen.halfPageMargin) +
                resources.getDimensionPixelOffset(R.dimen.peekOffset)
                // setting padding on inner RecyclerView puts overscroll effect in the right place
                // TODO: expose in later versions not to rely on
                //  getChildAt(0) which might break
                setPadding(leftPadding, 0, leftPadding, 0)
            }
            adapter = Adapter()
        }
    }

    class ViewHolder(parent: ViewGroup) : RecyclerView.ViewHolder(
        LayoutInflater.from(parent.context).inflate(R.layout.item_preview_pages, parent, false)
    )

    class Adapter : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
        override fun getItemCount(): Int {
            return 10
        }

        override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
            return ViewHolder(parent)
        }

        override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
            holder.itemView.tag = position
            holder.itemView.setOnClickListener {
                Toast.makeText(it.context, "position=$position", Toast.LENGTH_LONG).show()
            }
        }
    }
}

0x06 Fragment no longer exists for key f1

在 Fragment 中使用 ViewPager 的时候，切换 Fragment 导致 ViewPager 无法正确恢复异常

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java.lang.IllegalStateException: Fragment no longer exists for key f1: unique id 55efaee5-a65c-4e57-9281-7c8f8f6e4156
    at androidx.fragment.app.FragmentManager.getFragment(FragmentManager.java:960)
    at androidx.fragment.app.FragmentStatePagerAdapter.restoreState(FragmentStatePagerAdapter.java:328)
    at androidx.viewpager.widget.ViewPager.onRestoreInstanceState(ViewPager.java:1461)
    at android.view.View.dispatchRestoreInstanceState(View.java:20032)
    at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3922)
    at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:3928)
    at android.view.View.restoreHierarchyState(View.java:20010)
    at androidx.fragment.app.Fragment.restoreViewState(Fragment.java:639)
    at androidx.fragment.app.Fragment.restoreViewState(Fragment.java:3010)
    at androidx.fragment.app.Fragment.performActivityCreated(Fragment.java:3001)
    at androidx.fragment.app.FragmentStateManager.activityCreated(FragmentStateManager.java:580)
    at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:285)
    at androidx.fragment.app.FragmentManager.executeOpsTogether(FragmentManager.java:2189)
    at androidx.fragment.app.FragmentManager.removeRedundantOperationsAndExecute(FragmentManager.java:2100)
    at androidx.fragment.app.FragmentManager.execPendingActions(FragmentManager.java:2002)
    at androidx.fragment.app.FragmentManager$5.run(FragmentManager.java:524)
    at android.os.Handler.handleCallback(Handler.java:883)
    at android.os.Handler.dispatchMessage(Handler.java:100)
    at android.os.Looper.loop(Looper.java:230)
    at android.app.ActivityThread.main(ActivityThread.java:8018)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:526)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1034)

20240301183554

在这个页面中，内容列表使用 ViewPager 嵌套 Fragment 实现，并和时间选择 Tab 绑定。切换【即将上线】和【播出时间表】Tab，实际是使用 FragmentManager 的 replace 方法，动态切换两个 Fragment，然后就报了上面的异常。

网上流行的解决方案是使用 FragmentPagerAdapter 或者添加

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@Override
public Parcelable saveState() {
    return null;
}

但是这样处理会导致 ViewPager 中的 fragments 全部无法恢复，导致 ViewPager 白屏。

本例中的解决方案是：

在切换【即将上线】和【播出时间表】Tab 时，不使用 FragmentManager 的 replace 方法，而采用动态的 Hide 和 show 方法暂时规避 Fragment 被回收的问题。

发表5 分钟读完 (大约793个字)

Problems专题：RecyclerView

Problems专题：RecyclerView

0x01 Called attach on a child which is not detached

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java.lang.IllegalArgumentException: Called attach on a child which is not detached: BaseViewHolder{2b241e1 position=12 id=-1, oldPos=-1, pLpos:-1} androidx.recyclerview.widget.RecyclerView{afecb06 VFED..... ......ID 0,0-1080,2055 #7f09236e app:id/recycler_view_xxx}, adapter:com.xxxx.adapter.XxxAdapter@cfc75c7, layout:androidx.recyclerview.widget.LinearLayoutManager@24af7f4, context:com.xxxx.XxxActivity@1ed75e2
	at androidx.recyclerview.widget.RecyclerView$5.attachViewToParent(RecyclerView.java:917)
	at androidx.recyclerview.widget.ChildHelper.attachViewToParent(ChildHelper.java:239)
	at androidx.recyclerview.widget.RecyclerView.addAnimatingView(RecyclerView.java:1438)
	at androidx.recyclerview.widget.RecyclerView.animateDisappearance(RecyclerView.java:4377)
	at androidx.recyclerview.widget.RecyclerView$4.processDisappeared(RecyclerView.java:616)
	at androidx.recyclerview.widget.ViewInfoStore.process(ViewInfoStore.java:242)
	at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep3(RecyclerView.java:4210)
	at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java:3864)
	at androidx.recyclerview.widget.RecyclerView.onLayout(RecyclerView.java:4410)
	at android.view.View.layout(View.java:22213)
	at android.view.ViewGroup.layout(ViewGroup.java:6340)
	at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1131)
	at android.view.View.layout(View.java:22213)
	at android.view.ViewGroup.layout(ViewGroup.java:6340)
	at androidx.viewpager.widget.ViewPager.onLayout(ViewPager.java:1775)
	at android.view.View.layout(View.java:22213)
	at android.view.ViewGroup.layout(ViewGroup.java:6340)
	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1829)
	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
	at android.widget.LinearLayout.onLayout(LinearLayout.java:1582)
	at android.view.View.layout(View.java:22213)
	at android.view.ViewGroup.layout(ViewGroup.java:6340)
	at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1131)
	at android.view.View.layout(View.java:22213)
	at android.view.ViewGroup.layout(ViewGroup.java:6340)
	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
	at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
	at android.view.View.layout(View.java:22213)
	at android.view.ViewGroup.layout(ViewGroup.java:6340)
	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1829)
	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
	at android.widget.LinearLayout.onLayout(LinearLayout.java:1582)
	at android.view.View.layout(View.java:22213)
	at android.view.ViewGroup.layout(ViewGroup.java:6340)
	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
	at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
	at android.view.View.layout(View.java:22213)
	at android.view.ViewGroup.layout(ViewGroup.java:6340)
	at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1829)
	at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1673)
	at android.widget.LinearLayout.onLayout(LinearLayout.java:1582)
	at android.view.View.layout(View.java:22213)
	at android.view.ViewGroup.layout(ViewGroup.java:6340)
	at android.widget.FrameLayout.layoutChildren(FrameLayout.java:332)
	at android.widget.FrameLayout.onLayout(FrameLayout.java:270)
	at com.android.internal.policy.DecorView.onLayout(DecorView.java:905)
	at android.view.View.layout(View.java:22213)
	at android.view.ViewGroup.layout(ViewGroup.java:6340)
	at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:3286)
	at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2757)
	at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1865)
	at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7933)
	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1018)
	at android.view.Choreographer.doCallbacks(Choreographer.java:837)
	at android.view.Choreographer.doFrame(Choreographer.java:767)
	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1003)
	at android.os.Handler.handleCallback(Handler.java:883)
	at android.os.Handler.dispatchMessage(Handler.java:100)
	at android.os.Looper.loop(Looper.java:230)
	at android.app.ActivityThread.main(ActivityThread.java:7951)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:526)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1034)

问题分析

对同一个 position 位置同时进行notifyItemRemoved(position) 和 notifyItemInserted(position) 操作导致。

解决方案

避免同时对同一个位置先 notifyItemRemoved 再 notifyItemInserted，使用 notifyItemChanged。

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adapter?.notifyItemChanged(position)

0x02 RecyclerView设置最大高度、宽度

当RecyclerView属性设置为wrap_content+maxHeight时，maxHeight没有效果。

问题分析

当RecyclerView的LayoutManager#isAutoMeasureEnabled()返回true时，RecyclerView高度取决于children view的布局高度，并非取决于RecyclerView自身的测量高度。

解决方案

因此，我们只需要重写LayoutManager的public void setMeasuredDimension(Rect childrenBounds, int wSpec, int hSpec)方法即可为RecyclerView设置最大宽高。

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recyclerView.layoutManager = object : LinearLayoutManager(context, RecyclerView.VERTICAL, false) {
    override fun setMeasuredDimension(childrenBounds: Rect?, wSpec: Int, hSpec: Int) {
        val height = View.MeasureSpec.getSize(hSpec)
        val maxHeight = getScreenHeight() * 4 / 5
        val realHeight = height.coerceAtMost(maxHeight)
        val realHeightSpec = View.MeasureSpec.makeMeasureSpec(realHeight, AT_MOST)
        super.setMeasuredDimension(childrenBounds, wSpec, realHeightSpec)
    }
}

作者：猫爸iYao
链接：https://www.jianshu.com/p/0dec79ff70df
来源：简书
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。

发表6 分钟读完 (大约838个字)

Problems专题：Parcel

Problems专题：Parcel

0x01 Unmarshalling unknown type

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Thread Name: 'main' 
java.lang.RuntimeException: Parcel android.os.Parcel@bbfcc04: Unmarshalling unknown type code 2131296928 at offset 1088
	at android.os.Parcel.readValue(Parcel.java:2750)
	at android.os.Parcel.readSparseArrayInternal(Parcel.java:3126)
	at android.os.Parcel.readSparseArray(Parcel.java:2354)
	at android.os.Parcel.readValue(Parcel.java:2728)
	at android.os.Parcel.readArrayMapInternal(Parcel.java:3045)
	at android.os.BaseBundle.initializeFromParcelLocked(BaseBundle.java:288)
	at android.os.BaseBundle.unparcel(BaseBundle.java:232)
	at android.os.Bundle.getSparseParcelableArray(Bundle.java:1010)
	at com.android.internal.policy.PhoneWindow.restoreHierarchyState(PhoneWindow.java:2133)
	at android.app.Activity.onRestoreInstanceState(Activity.java:1173)
	at android.app.Activity.performRestoreInstanceState(Activity.java:1128)
	at android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1318)
	at android.app.ActivityThread.handleStartActivity(ActivityThread.java:3025)
	at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:180)
	at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:165)
	at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:142)
	at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:70)
	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1840)
	at android.os.Handler.dispatchMessage(Handler.java:106)
	at android.os.Looper.loop(Looper.java:207)
	at android.app.ActivityThread.main(ActivityThread.java:6878)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:876)

问题分析

情况1 Parcelable 对象为空，反序列化异常

情况2 Parcelable 序列化和反序列化的字段和顺序没有完全对应

情况3 自定义View的数据保存与恢复

解决方案

情况1 Parcelable 对象在序列化和反序列化增加 null 值判断

情况2 Parcelable 对象 read 和 write 字段的类型和顺序保持一直

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public class Account implements Parcelable {
    public Account(Parcel in) {
        this.name = in.readString();
        this.type = in.readInt();
        if (TextUtils.isEmpty(name)) {
            throw new android.os.BadParcelableException("the name must not be empty: " + name);
        }
        // ...
        this.accessId = in.readString();
        // ...
    }

    public int describeContents() {
        return 0;
    }

    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(name);
        dest.writeInt(type);
        dest.writeString(accessId);
    }
    // ...
}

情况3 自定义View的数据保存与恢复

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override fun onSaveInstanceState(): Parcelable? {
    Log.d("NavigationBar", "onSaveInstanceState: selectedId=${mSelectedId}")
    return SavedState(super.onSaveInstanceState(), mSelectedId)
}

override fun onRestoreInstanceState(state: Parcelable?) {
    if (state is SavedState) {
        val id = state.selectedId
        Log.d("NavigationBar", "onRestoreInstanceState: selectedId=${state.selectedId}")
        super.onRestoreInstanceState(state.superState)
        select(id)
        return
    }
    return super.onRestoreInstanceState(state)
}

internal class SavedState : BaseSavedState {
    var selectedId: Int = View.NO_ID

    constructor(source: Parcel) : super(source) {
        selectedId = source.readInt()
        Log.d("NavigationBar", "readFromParcel: selectedId=$selectedId")
    }

    constructor(superState: Parcelable?, selectedId: Int) : super(superState) {
        this.selectedId = selectedId
    }

    override fun writeToParcel(parcel: Parcel, flags: Int) {
        super.writeToParcel(parcel, flags)
        parcel.writeInt(selectedId)
        Log.d("NavigationBar", "writeToParcel: selectedId=$selectedId")
    }

    override fun describeContents(): Int {
        return 0
    }

    companion object CREATOR : Parcelable.Creator<SavedState> {
        override fun createFromParcel(parcel: Parcel): SavedState {
            return SavedState(parcel)
        }

        override fun newArray(size: Int): Array<SavedState?> {
            return arrayOfNulls(size)
        }
    }
}

0x02 android.os.TransactionTooLargeException

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java.lang.RuntimeException: android.os.TransactionTooLargeException: data parcel size 542688 bytes
	at android.app.servertransaction.PendingTransactionActions$StopInfo.run(PendingTransactionActions.java:160)
	at android.os.Handler.handleCallback(Handler.java:873)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:207)
	at android.app.ActivityThread.main(ActivityThread.java:6878)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:876)
Caused by: android.os.TransactionTooLargeException: data parcel size 542688 bytes
	at android.os.BinderProxy.transactNative(Native Method)
	at android.os.BinderProxy.transact(BinderProxy.java:479)
	at android.app.IActivityManager$Stub$Proxy.activityStopped(IActivityManager.java:3941)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.taobao.monitor.impl.common.c.invoke(ActivityManagerHook.java:89)
	at java.lang.reflect.Proxy.invoke(Proxy.java:1006)
	at $Proxy2.activityStopped(Unknown Source)
	at android.app.servertransaction.PendingTransactionActions$StopInfo.run(PendingTransactionActions.java:144)
	... 7 more
android.os.TransactionTooLargeException: data parcel size 542688 bytes
	at android.os.BinderProxy.transactNative(Native Method)
	at android.os.BinderProxy.transact(BinderProxy.java:479)
	at android.app.IActivityManager$Stub$Proxy.activityStopped(IActivityManager.java:3941)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.taobao.monitor.impl.common.c.invoke(ActivityManagerHook.java:89)
	at java.lang.reflect.Proxy.invoke(Proxy.java:1006)
	at $Proxy2.activityStopped(Unknown Source)
	at android.app.servertransaction.PendingTransactionActions$StopInfo.run(PendingTransactionActions.java:144)
	at android.os.Handler.handleCallback(Handler.java:873)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:207)
	at android.app.ActivityThread.main(ActivityThread.java:6878)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:876)

问题分析

1 Intent 传递的数据过大。

2 onSaveInstance 保存的数据过大。

解决方案

尽可能的使用少量的数据。

大数据考虑持久化和其他传递形式。

发表3 分钟读完 (大约432个字)

Problems专题：Dialog

Problems专题：Dialog

0x01 OnKeyDown部分机型无法监听

问题分析

监听返回键和音量键，重载OnKeyDown()方法，部分机型会失效。

解决方案

给相应的Dialog监听setOnKeyListener()。

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// 解决不同机型版本兼容问题，onKeyDown 可能被拦截
setOnKeyListener { dialog, keyCode, event ->
 Log.d(TAG, "setOnKeyListener: keyCode = $keyCode, event = $event")
 if (keyCode == KeyEvent.KEYCODE_VOLUME_UP || keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
     handleKeyEvent(keyCode)
     true
 } else {
     false
 }
}

注意区分keycode，防止业务层重复处理

0x02 DialogFragment不能自动弹出软键盘

方案一：延迟弹出软键盘
在dialog显示之后，延迟200ms再显示软键盘

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//强制显示或者关闭系统键盘
public static void toggleKeyboard(final EditText editText, final boolean status) {
    if (editText == null) return;
    Timer timer = new Timer();
    timer.schedule(new TimerTask() {
        @Override
        public void run() {
            InputMethodManager m = (InputMethodManager)
                ApplicationExtKt.getAppContext().getSystemService(Context.INPUT_METHOD_SERVICE);
            if (status) {
                m.showSoftInput(editText, InputMethodManager.SHOW_FORCED);
            } else {
                IBinder windowToken = editText.getWindowToken();
                if (windowToken != null) {
                    m.hideSoftInputFromWindow(windowToken, 0);
                }
            }
        }
    }, status ? 200 : 100);
}

方案二：设置 SoftInputMode 为 SOFT_INPUT_STATE_ALWAYS_VISIBLE

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getDialog().getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
inputEditText.requestFocus();

0x03 关闭DialogFragment无法关闭软键盘

问题分析

一般情况下，在onPause或者dismiss方法直接调用hideKeyboard就可以

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override fun onPause() {
    KeyBoardUtils.hideKeyboard(binding.etSearch)
    super.onPause()
}

但是，在某些时候还是会存在关闭不成功的情况。这是由于Dialog下面的Activity或Fragment存在EditText等抢占焦点，导致在DialogFragment在调用dismiss方法时，键盘已经被抢占焦点，所以无法关闭。

解决方案

在DialogFragment的dismiss方法回调

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override fun onDismiss(dialog: DialogInterface) {
    listener?.onDialogDismiss()
    super.onDismiss(dialog)
}

在前一个Activity或者Fragment中重新关闭键盘。

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// 消除弹框遗留下来的keyboard
private fun onDialogDismiss() {
    // 消除弹框
    Handler().postDelayed({
        KeyBoardUtils.hideKeyboard(binding.root)
    }, 200)
}
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