发表7 分钟读完 (大约1018个字)

Aria下载器源码分析

Aria下载器源码分析

Aria 中文文档: https://aria.laoyuyu.me/aria_doc/

版本：3.8.15

0x01 注册流程

在Activity的onCreate、fragment的onCreate、java的构造函数中使用Aria.download(this).register()便可以实现注册。

0x0101 Aria类，下载库的统一入口

Aria类仅一个私有的构造方法，无法实例化

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private Aria() {}

0x0102 Aria类的download方法

Aria类中的2个主要静态方法 download, upload, 对应下载和上传两种类型

以下载方法为例，下载，在当前类中调用Aria方法，参数需要使用this，返回对象是 DownloadReceiver

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public static DownloadReceiver download(Object obj) {
    if (AriaManager.getInstance() != null) {
      return AriaManager.getInstance().download(obj);
    }
    return get(convertContext(obj)).download(obj);
}
  1. AriaManager是个单例
  2. 首次会走get方法，最终执行AriaManager#init()方法进行初始化
  3. convertContext()方法会判断当前参数obj是否是Context对象，并返回Context
  4. 最后都会执行AriaManager单例对象的download()方法，返回一个DownloadReceiver对象

0x0103 AriaManager初始化

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@SuppressLint("StaticFieldLeak") 
private static volatile AriaManager INSTANCE = null;

private AriaManager(Context context) {
  APP = context.getApplicationContext();
}

public static AriaManager getInstance() {
  return INSTANCE;
}

static AriaManager init(Context context) {
  if (INSTANCE == null) {
    synchronized (LOCK) {
      if (INSTANCE == null) {
        INSTANCE = new AriaManager(context);
        INSTANCE.initData();
      }
    }
  }
  return INSTANCE;
}

private void initData() {
  mConfig = AriaConfig.init(APP);
  initDb(APP);
  regAppLifeCallback(APP);
  initAria();
}

  1. init()方法，双空判断加锁实现AriaManager单例
  2. 初始化调用 initData() 方法
  3. 初始化 AriaConfig
  4. 初始化DB
  5. 注册APP生命周期回调，Activity销毁自动移除当前对象的receiver
  6. Aria初始化，异常处理，日志，命令处理器 CommandManager 初始化

0x0104 AriaManager类的download

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private Map<String, AbsReceiver> mReceivers = new ConcurrentHashMap<>();
/**
* 处理下载操作
*/
DownloadReceiver download(Object obj) {
    IReceiver receiver = mReceivers.get(getKey(ReceiverType.DOWNLOAD, obj));
    if (receiver == null) {
        receiver = putReceiver(ReceiverType.DOWNLOAD, obj);
    }
    return (receiver instanceof DownloadReceiver) ? (DownloadReceiver) receiver : null;
}

private IReceiver putReceiver(ReceiverType type, Object obj) {
    final String key = getKey(type, obj);
    IReceiver receiver = mReceivers.get(key);

    if (receiver == null) {
      AbsReceiver absReceiver =
          type.equals(ReceiverType.DOWNLOAD) ? new DownloadReceiver(obj) : new UploadReceiver(obj);
      mReceivers.put(key, absReceiver);
      receiver = absReceiver;
    }
    return receiver;
}
  1. 调用download方法，根据obj和ReceiverType.DOWNLOAD类型生成key，查询mReceivers是否已经存在当前对象的下载功能接收器DownloadReceiver，存在直接返回
  2. 首次调用，会走到putReceiver方法，新生成一个下载功能接收器DownloadReceiver，并存储在mReceivers中

0x0105 将当前对象注册到Aria

  1. 调用DownloadReceiver#register()方法
  2. 通过DOWNLOAD注解或者实现DownloadTaskListener接口，调用TaskSchedulers.getInstance().register()将当前类注册到Aria

0x0106 TaskSchedulers注册(TODO)

TaskSchedulers 事件调度器，用于处理任务状态的调度

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private Map<String, Map<TaskEnum, Object>> mObservers = new ConcurrentHashMap<>();
/**
 * 将当前类注册到Aria
 *
 * @param obj 观察者类
 * @param taskEnum 任务类型 {@link TaskEnum}
 */
public void register(Object obj, TaskEnum taskEnum) {
  String targetName = obj.getClass().getName();
  Map<TaskEnum, Object> listeners = mObservers.get(getKey(obj));

  if (listeners == null) {
    listeners = new ConcurrentHashMap<>();
    mObservers.put(getKey(obj), listeners);
  }

  if (!hasProxyListener(listeners, taskEnum)) {
    if (obj instanceof TaskInternalListenerInterface) {
      listeners.put(taskEnum, obj);
      return;
    }
    String proxyClassName = targetName + taskEnum.proxySuffix;
    ISchedulerListener listener = createListener(proxyClassName);
    if (listener != null) {
      listener.setListener(obj);
      listeners.put(taskEnum, listener);
    } else {
      ALog.e(TAG, "注册错误，没有【" + proxyClassName + "】观察者");
    }
  }
}

0x02 下载流程(TODO)

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long taskId = Aria.download(this)
    .load(DOWNLOAD_URL)     //读取下载地址
    .setFilePath(DOWNLOAD_PATH) //设置文件保存的完整路径
    .create();   //启动下载

01 DownloadReceiver.load()
1 HttpBuilderTarget.create()
2 BuilderController.create()
3 CmdHelper.createNormalCmd()
4 NormalCmdFactory.createCmd() -> StartCmd
5 EventMsgUtil.getDefault().post(StartCmd) -> mEventQueue.take()
6 EventMsgUtil.sendEvent()
7 StartCmd.executeCmd() -> AbsNormalCmd.startTask()
8 DTaskQueue.createTask(DTaskWrapper wrapper)
9 TaskWrapperManager.getInstance().putTaskWrapper(wrapper)
10 AbsTaskQueue.startTask()
11 DLoadExecutePool.putTask()
12 AbsTask.start()
13 HttpDLoaderUtil.start() -> AbsNormalLoaderUtil.start()
14 NormalLoader.run() -> AbsNormalLoader.run()
15 AbsNormalLoader.startFlow() -> NormalLoader.handleTask()// 启动单线程任务
16 NormalLoader.startThreadTask()
17 NormalTTBuilder.buildThreadTask()
18 ThreadTaskManager.getInstance().startThread()
19 AbsNormalLoader.startTimer() // 启动进度获取定时器

21 ThreadTask.call() // 线程池执行任务回调
22 AbsThreadTaskAdapter.call()
23 HttpDThreadTaskAdapter.handlerThreadTask() // 正式建立Http连接，下载任务
24 HttpDThreadTaskAdapter.readNormal()

25 HttpDThreadTaskAdapter.handleComplete()
26 ThreadTask.updateCompleteState()
27 NormalThreadStateManager.callback -> STATE_COMPLETE
28 BaseListener.onComplete() // 对应的实体类是BaseDListener
29 BaseListener.sendInState2Target() // 将任务状态发送给下载器

0x03 完成事件逆行分析

  1. IDLoadListener.onComplete()
  2. NormalLoader.addComponent(IRecordHandler recordHandler) -> ILoaderVisitor.addComponent(IRecordHandler recordHandler) // 处理任务记录
  3. RecordHandler.checkTaskCompleted() // 检查任务是否已完成
  4. 遍历TaskRecord中所有的ThreadRecord.isComplete就认为下载完成

0x04 M3U8文件下载过程

M3U8ThreadTaskAdapter.readDynamicFile(InputStream is) // 动态长度文件读取方式
M3U8ThreadTaskAdapter.handleComplete() // 处理完成
ThreadTask.updateCompleteState() // 组装Message消息，发送给VodStateManager.callback -> Handler.Callback
VodStateManager.callback -> STATE_COMPLETE
BaseListener.onComplete() // 对应的实体类是M3U8Listener

发表1 分钟读完 (大约147个字)

RecyclerView滑动到指定Item并置顶

RecyclerView滑动到指定Item并置顶

0x01 TopLinearSmoothScroller

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import android.content.Context
import androidx.recyclerview.widget.LinearSmoothScroller

class TopLinearSmoothScroller(context: Context?) : LinearSmoothScroller(context) {
    public override fun getVerticalSnapPreference(): Int {
        return SNAP_TO_START
    }

    override fun getHorizontalSnapPreference(): Int {
        return SNAP_TO_START
    }
}

0x02 TopScrollLinearLayoutManager

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import android.content.Context
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView

class TopScrollLinearLayoutManager(context: Context?, orientation: Int, reverseLayout: Boolean) :
    LinearLayoutManager(context, orientation, reverseLayout) {

    override fun smoothScrollToPosition(
        recyclerView: RecyclerView?,
        state: RecyclerView.State?,
        position: Int
    ) {
        val linearSmoothScroller = TopLinearSmoothScroller(recyclerView?.context)
        linearSmoothScroller.targetPosition = position
        startSmoothScroll(linearSmoothScroller)
    }
}

0x03 RecyclerView中使用

设置recyclerView的layoutManager为自定义的TopScrollLinearLayoutManager，然后直接调用 smoothScrollToPosition() 方法就可以滚动到指定的位置并且置顶了。

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recyclerView.layoutManager = TopScrollLinearLayoutManager(
    this,
    LinearLayoutManager.HORIZONTAL,
    false
)
// ...
recyclerView.smoothScrollToPosition(1)
发表4 分钟读完 (大约542个字)

ExoPlayer简易播放器

ExoPlayer简易播放器

一个简单的基于ExoPlayer的播放器。
ExoPlayer官网：https://exoplayer.dev/
使用ExoPlayer版本：2.18.2

实现功能：通过url播放视频，简易自定义controller，监听播放器状态变化，首帧时间打印，错误信息打印。

如果需要深层次的UI定制，建议不要用exo_ui库下面的布局，用SurfaceView和TextureView完全自定义。具体代码如下:

1.播放器Fragment

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import android.os.Bundle
import android.util.Log
import android.view.LayoutInflater
import android.view.View
import android.view.ViewGroup
import androidx.fragment.app.Fragment
import com.google.android.exoplayer2.ExoPlayer
import com.google.android.exoplayer2.MediaItem
import com.google.android.exoplayer2.PlaybackException
import com.google.android.exoplayer2.Player
import com.google.android.exoplayer2.Player.Listener
import com.google.android.exoplayer2.ui.StyledPlayerView

class ExoPlayerFragment : Fragment() {

    companion object {
        fun newInstance(url: String): ExoPlayerFragment {
            val args = Bundle()
            args.putString(EXO_URI, url)
            val fragment = ExoPlayerFragment()
            fragment.arguments = args
            return fragment
        }

        private const val TAG = "ExoPlayerFragment"
        private const val EXO_URI = "EXO_URI"
    }

    private var videoUri: String? = null
    private var player: ExoPlayer? = null

    private val listener = object : Listener {

        override fun onEvents(player: Player, events: Player.Events) {
            super.onEvents(player, events)
            Log.d(TAG, "onEvents->${events}:")
        }

        override fun onPlaybackStateChanged(playbackState: Int) {
            val stateString: String = when (playbackState) {
                ExoPlayer.STATE_IDLE -> "ExoPlayer.STATE_IDLE"
                ExoPlayer.STATE_BUFFERING -> "ExoPlayer.STATE_BUFFERING"
                ExoPlayer.STATE_READY -> "ExoPlayer.STATE_READY"
                ExoPlayer.STATE_ENDED -> "ExoPlayer.STATE_ENDED"
                else -> "UNKNOWN_STATE"
            }
            Log.d(TAG, "onPlaybackStateChanged: state=$stateString")
            super.onPlaybackStateChanged(playbackState)
            printPlayerTimeLine("onPlaybackStateChanged:")
        }

        override fun onRenderedFirstFrame() {
            super.onRenderedFirstFrame()
            printPlayerTimeLine("onRenderedFirstFrame:")
        }

        override fun onPlayerError(error: PlaybackException) {
            super.onPlayerError(error)
            printPlayerTimeLine("onPlayerError:")
            error.printStackTrace()
        }
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        videoUri = arguments?.getString(EXO_URI)
        val root = inflater.inflate(R.layout.exo_player_fragment, container, false)
        val playerView = root.findViewById<StyledPlayerView>(R.id.styled_player_view)
        initPlayerView(playerView)
        return root
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        startPlay()
    }

    private fun initPlayerView(playerView: StyledPlayerView) {
        Log.d(TAG, "initPlayerView: ")
        player = ExoPlayer.Builder(requireContext()).build()
        player?.addListener(listener)
        // Bind the player to the view.
        playerView.player = player

        // back
        playerView.findViewById<View>(R.id.back).setOnClickListener {
            fragmentManager?.popBackStack()
            val ft = fragmentManager?.beginTransaction()
            ft?.remove(this@ExoPlayerFragment)
            ft?.commitAllowingStateLoss()
        }
    }

    private var prepareTime: Long = 0L
    private fun printPlayerTimeLine(method: String) {
        val c = System.currentTimeMillis()
        val duration = if (prepareTime == 0L) 0 else c - prepareTime
        prepareTime = c
        Log.i(TAG, "printPlayerTimeLine: method=$method, duration=$duration, uri=${videoUri}")
    }

    private fun startPlay() {
        Log.d(TAG, "startPlay: ")
        videoUri?.let {
            // Build the media item.
            val mediaItem: MediaItem = MediaItem.fromUri(it)

            // Set the media item to be played.
            player?.setMediaItem(mediaItem)

            // Prepare the player.
            player?.prepare()
            printPlayerTimeLine("player->prepare:")

            // Start the playback.
            player?.play()
//            calPlayerTimeLine("player->play:")
        }
    }

    override fun onDestroy() {
        player?.release()
        super.onDestroy()
    }
}

2.播放器布局

exo_player_fragment.xml

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<?xml version="1.0" encoding="utf-8"?>

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/black"
    android:clickable="true">

    <com.google.android.exoplayer2.ui.StyledPlayerView
        android:id="@+id/styled_player_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:keepScreenOn="true"
        app:animation_enabled="false"
        app:controller_layout_id="@layout/custom_player_control_view"
        app:use_controller="true" />

</FrameLayout>

3.自定义的controller布局

custom_player_control_view.xml

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<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="bottom"
    android:background="#00000000"
    android:layoutDirection="ltr"
    android:orientation="vertical"
    tools:targetApi="28">

    <ImageView
        android:id="@+id/back"
        android:layout_width="42dp"
        android:layout_height="42dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:background="#33000000"
        android:scaleType="centerInside"
        android:src="@mipmap/back"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <LinearLayout
        android:id="@id/exo_bottom_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#33000000"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        android:paddingTop="4dp"
        android:paddingBottom="4dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent">


        <ImageButton
            android:id="@id/exo_prev"
            style="@style/ExoStyledControls.Button.Center.Previous"
            android:padding="8dp" />

        <ImageButton
            android:id="@id/exo_play_pause"
            style="@style/ExoStyledControls.Button.Center.PlayPause"
            android:padding="8dp" />

        <ImageButton
            android:id="@id/exo_next"
            style="@style/ExoStyledControls.Button.Center.Next"
            android:padding="8dp" />

        <TextView
            android:id="@id/exo_position"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:includeFontPadding="false"
            android:paddingLeft="4dp"
            android:paddingRight="4dp"
            android:textColor="#FFBEBEBE"
            android:textSize="14sp"
            android:textStyle="bold" />

        <com.google.android.exoplayer2.ui.DefaultTimeBar
            android:id="@id/exo_progress"
            android:layout_width="0dp"
            android:layout_height="26dp"
            android:layout_weight="1" />

        <TextView
            android:id="@id/exo_duration"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:includeFontPadding="false"
            android:paddingLeft="4dp"
            android:paddingRight="4dp"
            android:textColor="#FFBEBEBE"
            android:textSize="14sp"
            android:textStyle="bold" />

    </LinearLayout>


</androidx.constraintlayout.widget.ConstraintLayout>
发表2 分钟读完 (大约319个字)

SystemBarUtil 工具类

SystemBarUtil 工具类

工具类，提供了系统栏高度和屏幕宽高获取方法

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import android.app.Activity
import android.content.Context
import android.graphics.Point
import android.os.Build
import android.view.View
import android.view.ViewGroup
import android.view.WindowManager

/**
* 工具类，提供了系统栏高度和屏幕宽高获取方法
*/
object SystemBarUtil {

    /**
     * 获取状态栏高度
     */
    @JvmStatic
    fun getStatusBarHeight(context: Context): Int {
        var height = 0
        try {
            val resourceId = context.applicationContext.resources.getIdentifier(
                "status_bar_height",
                "dimen",
                "android"
            )
            if (resourceId > 0) {
                height =
                    context.applicationContext.resources.getDimensionPixelSize(resourceId)
            }
        } catch (e: Exception) {
        }
        return height
    }

    /**
     * 获取系统导航栏高度
     */
    @JvmStatic
    fun getNavigationBarHeight(context: Context): Int {
        var height = 0
        try {
            val resourceId = context.applicationContext.resources.getIdentifier(
                "navigation_bar_height",
                "dimen",
                "android"
            )
            if (resourceId > 0) {
                height =
                    context.applicationContext.resources.getDimensionPixelSize(resourceId)
            }
        } catch (e: Exception) {
        }
        return height
    }

    private const val NAVIGATION = "navigationBarBackground"

    // 该方法需要在View完全被绘制出来之后调用
    @JvmStatic
    private fun isNavigationBarVisible(activity: Activity): Boolean {
        val vp = activity.window.decorView as ViewGroup?
        if (vp != null) {
            for (i in 0 until vp.childCount) {
                vp.getChildAt(i).context.packageName
                if (vp.getChildAt(i).id !== View.NO_ID &&
                    NAVIGATION == activity.resources.getResourceEntryName(vp.getChildAt(i).id)
                ) {
                    return true
                }
            }
        }
        return false
    }

    /**
     * 获取屏幕的物理大小 px
     */
    @JvmStatic
    fun getDeviceScreenSize(context: Context): Point {
        val appContext = context.applicationContext
        val wm = appContext.getSystemService(Context.WINDOW_SERVICE) as WindowManager
        val point = Point(0, 0)
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
            wm.defaultDisplay.getRealSize(point)
        } else {
            wm.defaultDisplay.getSize(point)
        }
        return point
    }

    /**
     * 获取显示屏幕的宽高 px
     */
    @JvmStatic
    fun getDisplaySize(context: Context): Point {
        val point = Point(0, 0)
        val dm = context.applicationContext.resources.displayMetrics
        point.x = dm.widthPixels
        point.y = dm.heightPixels
        return point
    }
}
发表1 分钟读完 (大约216个字)

Android 13 监控网络连接状态

Android 13 监控网络连接状态

获取瞬时状态

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val cm = context.applicationContext.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
val currentNetwork = cm.activeNetwork
if (currentNetwork != null) {
    val caps = cm.getNetworkCapabilities(currentNetwork)
    val linkProperties = cm.getLinkProperties(currentNetwork)
}

监听网络事件

将 NetworkCallback 类与 ConnectivityManager.registerDefaultNetworkCallback(NetworkCallback) 及 ConnectivityManager.registerNetworkCallback(NetworkCallback) 结合使用。

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val cm = context.applicationContext.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
cm.registerDefaultNetworkCallback(object : ConnectivityManager.NetworkCallback() {
    override fun onAvailable(network: Network) {
        Log.e(TAG, "The default network is now: " + network)
    }

    override fun onLost(network: Network) {
        Log.e(TAG, "The application no longer has a default network. The last default network was " + network)
        handle(null)
    }

    override fun onCapabilitiesChanged(
        network: Network,
        networkCapabilities: NetworkCapabilities
    ) {
        Log.d(TAG, "The default network changed capabilities: " + networkCapabilities)
        handle(networkCapabilities)
    }

    override fun onLinkPropertiesChanged(network: Network, linkProperties: LinkProperties) {
        Log.i(TAG, "The default network changed link properties: " + linkProperties)
    }
})

解析NetworkCapabilities的网络状态信息

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 private fun handle(caps: NetworkCapabilities?) {
    if (caps != null) {
        if (caps.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED)) {
            if (
                caps.hasTransport(NetworkCapabilities.TRANSPORT_WIFI) ||
                caps.hasTransport(NetworkCapabilities.TRANSPORT_WIFI_AWARE)
            ) {
                setResult(STATE_WIFI)
                return
            } else if (
                caps.hasTransport(NetworkCapabilities.TRANSPORT_CELLULAR) ||
                caps.hasTransport(NetworkCapabilities.TRANSPORT_ETHERNET)
            ) {
                setResult(STATE_MOBILE)
                return
            }
        }
    }
    setResult(STATE_UNKNOWN)
    return
}
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