Question

我在adapter RecyclerView中有此代码：

holder.image.setOnLongClickListener(new View.OnLongClickListener() {
  @Override
  public boolean onLongClick(View v) {
    int[] loc = new int[2];
    holder.image.getLocationInWindow(loc);
    ((FeedFragment) fragment).blurBackground(getBitmapFromView(holder.image), loc[0], loc[1]);
    Toast.makeText(context.getApplicationContext(), "Long press started", Toast.LENGTH_SHORT).show();
    isLongPressed = true;
    return true;
  }
});

holder.image.setOnTouchListener(new View.OnTouchListener() {
  @Override
  public boolean onTouch(View v, MotionEvent event) {
    v.onTouchEvent(event);
    // We're only interested in when the button is released.
    if (event.getAction() == MotionEvent.ACTION_UP) {
      // We're only interested in anything if our speak button is currently pressed.
      if (isLongPressed) {
        // ((FeedFragment) fragment).removeBlur();
        ((FeedFragment) fragment).showAllGalleries(String.valueOf(photo.getPk()));
        Toast.makeText(context.getApplicationContext(), "Long press ended", Toast.LENGTH_SHORT).show();
        // Do something when the button is released.
        isLongPressed = false;
      }
    }
    return false;
  }
});

所以我想做的是：一旦长按开始，我想调用一种方法来模糊屏幕，除了长时间点击发生的图像，这种模糊（改变背景的alpha）发生在400毫秒。

问题是，blurBackground()方法被调用两次。因此，当我删除onActivityResult中的模糊时，我只删除最后添加的图层，而由于方法被调用两次而存在另一层模糊。我希望blurBackground()方法只能被调用一次。

这种行为的原因是什么？如何修复？

以下是其他方法：

public void blurBackground(Bitmap bitmapFromView, int left, int top) {
  LogUtil.i(TAG, "blurBackground called");

  int statusBarHeight = (int) Math.ceil(25 * getActivity().getResources().getDisplayMetrics().density);

  RelativeLayout overlay = new RelativeLayout(getActivity());
  ID_OVERLAY = ViewIDGenerator.generateViewId();
  LogUtil.i(TAG, "ID = " + ID_OVERLAY);
  overlay.setId(ID_OVERLAY);
  overlay.setBackgroundColor(Color.parseColor("#000000"));
  RelativeLayout.LayoutParams overlayParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT, RelativeLayout.LayoutParams.MATCH_PARENT);
  overlay.setLayoutParams(overlayParams);

  ImageView snapshot = new ImageView(getActivity());
  snapshot.setImageBitmap(bitmapFromView);
  RelativeLayout.LayoutParams snapshotParams = new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
  snapshotParams.setMargins(left, top-statusBarHeight, 0, 0);
  snapshot.setLayoutParams(snapshotParams);

  overlay.addView(snapshot);
  container.addView(overlay);

  AlphaAnimation alphaAnimation = new AlphaAnimation(0.0f, 0.7f);
  alphaAnimation.setDuration(400);
  alphaAnimation.setFillAfter(true);
  overlay.startAnimation(alphaAnimation);
}

public void removeBlur() {
  LogUtil.i(TAG, "removeBlur called");
  LogUtil.i(TAG, "ID = " + ID_OVERLAY);
  View namebar = container.findViewById(ID_OVERLAY);
  ((ViewGroup) namebar.getParent()).removeView(namebar);
}

Answer 1

如果您唯一的问题是blurBackground被调用两次，您可以举起一个标志！

Boolean isBlurred = false;

然后在blurBackground

public void blurBackground(Bitmap bitmapFromView, int left, int top) {
  if (!isBlurred)
  { 
    LogUtil.i(TAG, "blurBackground called");

    ...
    isBlurred = true;
  }
}

Answer 2

为onTouch方法返回true，这样您就可以告诉您已处理该事件。

public boolean onTouch(View v, MotionEvent event) {
    doSomething();
    return true;
}

函数在OnLongClickListener中被调用了2次

2 个答案: