Android专栏-SmartRefreshLayout

Android专栏-SmartRefreshLayout

0x01 加载结束之后底部多出一段空白位置

SmartRefreshLayout 嵌套 ViewPager2 上拉加载更多，在 finishLoadMore() 方法之后，底部加载 Loading 位置会多出一段空白不消失。

解决方案：

smartRefreshLayout.setEnableScrollContentWhenLoaded(false)

0x02 下拉刷新+PAG动画

自定义下拉刷新头部，使用 PAGView 做动画，可以在 onMoving(boolean b, float v, int i, int i1, int i2) 方法中设置 pagView.setProgress(v); 添加手势动画。

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;

import androidx.annotation.ColorInt;
import androidx.annotation.NonNull;

import com.scwang.smartrefresh.layout.api.RefreshHeader;
import com.scwang.smartrefresh.layout.api.RefreshKernel;
import com.scwang.smartrefresh.layout.api.RefreshLayout;
import com.scwang.smartrefresh.layout.constant.RefreshState;
import com.scwang.smartrefresh.layout.constant.SpinnerStyle;

import org.libpag.PAGFile;
import org.libpag.PAGView;

public class CommonRefreshHeader extends RelativeLayout implements RefreshHeader {
    public static final String DEFAULT_LOADING_FILE = "load_bubble.pag";

    protected View mView;
    protected ImageView sdv_background;
    private int mFinishDuration = 300;
    private ViewGroup rootLayout;
    private PAGView pagView;
    private TextView toastTv;

    public CommonRefreshHeader(Context context) {
        super(context);
        initView(context);
    }

    public CommonRefreshHeader(Context context, AttributeSet attrs) {
        super(context, attrs);
        initView(context);
    }

    public CommonRefreshHeader(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initView(context);
    }

    public int getLayoutId() {
        return R.layout.layout_refresh_head;
    }

    protected void initView(Context context) {
        mView = LayoutInflater.from(context).inflate(getLayoutId(), this);
        toastTv = mView.findViewById(R.id.tv_toast);
        rootLayout = mView.findViewById(R.id.rootLayout);
        sdv_background = mView.findViewById(R.id.sdv_background);
        PAGFile file = PAGFile.Load(context.getAssets(), DEFAULT_LOADING_FILE);
        pagView = new PAGView(getContext());
        LayoutParams params = new LayoutParams(UiUtils.dip2px(39), UiUtils.dip2px(39));
        params.addRule(RelativeLayout.CENTER_IN_PARENT);
        pagView.setLayoutParams(params);
        pagView.setFile(file);
        pagView.setRepeatCount(0);
        rootLayout.addView(pagView);
    }

    public void setMarginTop(int marginTop) {
        if (mView == null) return;
        ViewGroup root = mView.findViewById(R.id.rootLayout);
        if (root != null && root.getLayoutParams() instanceof MarginLayoutParams) {
            MarginLayoutParams params = (MarginLayoutParams) root.getLayoutParams();
            params.topMargin = marginTop;
            root.setLayoutParams(params);
        }
    }

    @NonNull
    @Override
    public View getView() {
        return mView;
    }

    @Override
    public SpinnerStyle getSpinnerStyle() {
        return SpinnerStyle.Translate;
    }

    @Override
    public void setPrimaryColors(@ColorInt int... colors) {

    }

    @Override
    public void onInitialized(@NonNull RefreshKernel kernel, int height, int maxDragHeight) {

    }

    @Override
    public void onMoving(boolean b, float v, int i, int i1, int i2) {
        /**
         * 【仅限框架内调用】手指拖动下拉（会连续多次调用，添加isDragging并取代之前的onPulling、onReleasing）
         * @param isDragging true 手指正在拖动 false 回弹动画
         * @param percent 下拉的百分比 值 = offset/footerHeight (0 - percent - (footerHeight+maxDragHeight) / footerHeight )
         * @param offset 下拉的像素偏移量  0 - offset - (footerHeight+maxDragHeight)
         * @param height 高度 HeaderHeight or FooterHeight (offset 可以超过 height 此时 percent 大于 1)
         * @param maxDragHeight 最大拖动高度 offset 可以超过 height 参数 但是不会超过 maxDragHeight
         */
        if (pagView != null && !pagView.isPlaying()) {
            pagView.setProgress(v);
            pagView.flush();
        }
    }

    @Override
    public void onReleased(@NonNull RefreshLayout refreshLayout, int i, int i1) {

    }

    @Override
    public void onHorizontalDrag(float percentX, int offsetX, int offsetMax) {

    }

    @Override
    public void onStartAnimator(RefreshLayout layout, int height, int extendHeight) {
        LogUtils.e("RefreshHeader", "onStartAnimator");
        if (pagView != null) pagView.play();
    }

    @Override
    public int onFinish(RefreshLayout layout, boolean success) {
        LogUtils.e("RefreshHeader", "onFinish");
        if (pagView != null) pagView.stop();
        return mFinishDuration;//延迟500毫秒之后再弹回
    }

    @Override
    public boolean isSupportHorizontalDrag() {
        return false;
    }

    @Override
    public void onStateChanged(RefreshLayout refreshLayout, RefreshState oldState, RefreshState newState) {
        switch (newState) {
            case None:
            case PullDownToRefresh:
            case Refreshing:
                if (pagView != null) pagView.setVisibility(VISIBLE);
                if (toastTv != null) toastTv.setVisibility(GONE);
                break;
            case ReleaseToRefresh:
                break;
            case RefreshFinish:
                if (pagView != null) pagView.setVisibility(GONE);
                if (toastTv != null) toastTv.setVisibility(VISIBLE);
                break;
        }
    }

    public void setToastText(String str) {
        if (StringUtils.isEmpty(str)) return;
        if (toastTv != null) {
            toastTv.setText(str);
        }
    }

    public void setFinishDuration(int finishDuration) {
        this.mFinishDuration = finishDuration;
    }
}