Java Code Examples for android.view.ViewGroup#setDrawingCacheEnabled()

/**
     * 获取触点所在条目的位置
     * 获取选中条目的图片
     * 事件的拦截机制
     *
     * @param ev
     * @return
     */
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
//识别动作
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
//获取触点的坐标
                int x = (int) ev.getX();
                int y = (int) ev.getY();
//这样就可以计算我按到哪个条目上了
                mStartPosition = mEndPosition = pointToPosition(x, y);
//判断触点是否在logo的区域
                ViewGroup itemView = (ViewGroup) getChildAt(mStartPosition - getFirstVisiblePosition());
//记录手指在条目中的相对Y坐标
                dragPoint = y - itemView.getTop();
//ListView在屏幕中的Y坐标
                dragOffset = (int) (ev.getRawY() - y);
//拖动的图标
                View dragger = itemView.findViewById(R.id.guide_shape_im); //有修改
//判断触点是否在logo区域
                if (dragger != null && x < dragger.getRight() + 10) {
//定义ListView的滚动条目
//上
                    upScroll = getHeight() / 3;
//下
                    downScroll = getHeight() * 2 / 3;
//获取选中的图片/截图
                    itemView.setDrawingCacheEnabled(true);
//获取截图
                    Bitmap bitMap = itemView.getDrawingCache();
//图片滚动
                    startDrag(bitMap, y);
                }
                break;
        }
//还会传递事件到子View
        return false;
    }
 

private boolean showBlur() {
    if (!blurBackground) {
        return false;
    }

    //set invisible to avoid be blurred that resulting in show the blurred button edge when expanded,
    //must be called before do blur
    setVisibility(INVISIBLE);

    final ViewGroup root = (ViewGroup) getRootView();
    root.setDrawingCacheEnabled(true);
    Bitmap bitmap = root.getDrawingCache();
    checkBlurRadius();

    blur.setParams(new Blur.Callback() {
        @Override
        public void onBlurred(Bitmap blurredBitmap) {
            blurImageView.setImageBitmap(blurredBitmap);
            root.setDrawingCacheEnabled(false);
            root.addView(blurImageView, new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT));

            blurAnimator = ObjectAnimator.ofFloat(blurImageView, "alpha", 0.0f, 1.0f).setDuration(expandAnimDuration);
            if (blurListener != null) {
                blurAnimator.removeListener(blurListener);
            }
            blurAnimator.start();

            root.addView(maskView);
            maskAttached = true;
            maskView.reset();
            maskView.initButtonRect();
            maskView.onClickMainButton();
        }
    }, getContext(), bitmap, blurRadius);
    blur.execute();

    return true;
}
 

private Bitmap computeBitmap(ViewGroup viewGroup) {
    Bitmap bitmap;
    Rect rect = new Rect();
    viewGroup.getWindowVisibleDisplayFrame(rect);
    viewGroup.destroyDrawingCache();
    viewGroup.setDrawingCacheEnabled(true);
    viewGroup.buildDrawingCache(true);
    bitmap = viewGroup.getDrawingCache(true);
    /**
     * After rotation, the DecorView has no height and no width. Therefore
     * .getDrawingCache() return null. That's why we  have to force measure and layout.
     */
    if (bitmap == null) {
        viewGroup.measure(
                MeasureSpec.makeMeasureSpec(getWidth(), MeasureSpec.EXACTLY),
                MeasureSpec.makeMeasureSpec(mCoverHeight * 2, MeasureSpec.EXACTLY)
        );
        viewGroup.layout(0, 0, viewGroup.getMeasuredWidth(),
                viewGroup.getMeasuredHeight());
        viewGroup.destroyDrawingCache();
        viewGroup.setDrawingCacheEnabled(true);
        viewGroup.buildDrawingCache(true);
        bitmap = viewGroup.getDrawingCache(true);
    }
    if (bitmap == null) {
        return Bitmap.createBitmap(2, 2, Bitmap.Config.ARGB_8888);
    } else {
        return bitmap.copy(Bitmap.Config.ARGB_8888, false);
    }
}
 

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
	
	if ((mDragListener != null || mDropListener != null) 
			&& ev.getAction() == MotionEvent.ACTION_DOWN) {
		int x = (int) ev.getX();
		int y = (int) ev.getY();
		int itemnum = pointToPosition(x, y);
		if (itemnum != AdapterView.INVALID_POSITION) {

			ViewGroup item = (ViewGroup) getChildAt(itemnum - getFirstVisiblePosition());
			Log.d("DnD view", "Start dragging at " + (itemnum - getFirstVisiblePosition()) + " for "+ itemnum + " # "+ getFirstVisiblePosition());
			mDragPoint = y - item.getTop();
			mCoordOffset = ((int) ev.getRawY()) - y;
			View dragger = item.findViewById(grabberId);
			if(dragger == null || dragger.getVisibility() == View.GONE) {
			    return super.onInterceptTouchEvent(ev);
			}
			Rect r = mTempRect;
			r.left=dragger.getLeft();
			r.right=dragger.getRight();
			r.top=dragger.getTop();
			r.bottom=dragger.getBottom();   

			if ((r.left<x) && (x<r.right)) {
				item.setDrawingCacheEnabled(true);
				// Create a copy of the drawing cache so that it does
				// not get recycled
				// by the framework when the list tries to clean up
				// memory
				Bitmap bitmap = Bitmap.createBitmap(item.getDrawingCache());
				startDragging(bitmap, y);
				mDragPos = itemnum;
				mFirstDragPos = mDragPos;
				mHeight = getHeight();
				int touchSlop = mTouchSlop;
				mUpperBound = Math.min(y - touchSlop, mHeight / 3);
				mLowerBound = Math.max(y + touchSlop, mHeight * 2 / 3);
				item.setDrawingCacheEnabled(false);
				return false;
			}
			mDragView = null;
		}
	}
	return super.onInterceptTouchEvent(ev);
}
 

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    if (mDragListener != null || mDropListener != null) {
        switch (ev.getAction()) {
            case MotionEvent.ACTION_DOWN:
                int x = (int) ev.getX();
                int y = (int) ev.getY();
                int itemnum = pointToPosition(x, y);
                if (itemnum == AdapterView.INVALID_POSITION) {
                    break;
                }
                ViewGroup item = (ViewGroup) getChildAt(itemnum - getFirstVisiblePosition());
                mDragPoint = y - item.getTop();
                mCoordOffset = ((int) ev.getRawY()) - y;
                View dragger = item.findViewById(R.id.grabber);
                Rect r = mTempRect;
                dragger.getDrawingRect(r);
                if (shouldStartDragging(x, r.width())) {
                    // Fix x position while dragging
                    int[] itemPos = new int[2];
                    item.getLocationOnScreen(itemPos);

                    item.setDrawingCacheEnabled(true);
                    // Create a copy of the drawing cache so that it does
                    // not get recycled
                    // by the framework when the list tries to clean up
                    // memory
                    Bitmap bitmap = Bitmap.createBitmap(item.getDrawingCache());
                    startDragging(bitmap, itemPos[0], y);
                    mDragPos = itemnum;
                    mFirstDragPos = mDragPos;
                    mHeight = getHeight();
                    int touchSlop = mTouchSlop;
                    mUpperBound = Math.min(y - touchSlop, mHeight / 3);
                    mLowerBound = Math.max(y + touchSlop, mHeight * 2 / 3);
                    return false;
                }
                stopDragging();
                break;
        }
    }
    return super.onInterceptTouchEvent(ev);
}