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我正在尝试将多个自定义视图添加到框架布局,但它总是占用框架布局的整个宽度和高度。自定义视图只包含一个 50x50 的图像,我希望它能够在框架布局中移动,但由于自定义视图占据了整个空间并相互重叠,我无法选择其他自定义视图,因此我希望将其包裹起来。

这是我添加自定义视图的方式:

OverlayView overlayView = new OverlayView(EditorActivity.this, themeFilter.drawable);
frameLayout.addView(overlayView, 1, new FrameLayout.LayoutParams(FrameLayout.LayoutParams.WRAP_CONTENT, FrameLayout.LayoutParams.WRAP_CONTENT));

这是 OverlayView :

public class OverlayView extends View {

    Bitmap bitmap;
    float x,y;
    float centerX, centerY;

    public OverlayView(Context context, int drawable) {
        super(context);
    bitmap = BitmapFactory.decodeResource(context.getResources(), drawable);
    centerX = (float)getWidth() /2;
    centerY = (float)getHeight() /2;
    x = centerX;
    y = centerY;
}

@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    if (x != centerX && y != centerY) {
        canvas.drawBitmap(bitmap, x-bitmap.getWidth()/2, y-bitmap.getHeight()/2, null);
    } else {
        //INITIALIZE BITMAP ON CENTER OF SCREEN
        canvas.drawBitmap(bitmap, (float)getWidth()/2 - bitmap.getWidth()/2, (float)getHeight()/2 -bitmap.getHeight()/2, null);
    }
}

@Override
public boolean onTouchEvent(MotionEvent event) {
    switch(event.getAction()) {
        case MotionEvent.ACTION_DOWN :
            break;
        case MotionEvent.ACTION_MOVE :
            x = event.getX();
            y = event.getY();
            invalidate();
            break;
        case MotionEvent.ACTION_UP :
            x = event.getX();
            y = event.getY();
            invalidate();
    }
    return true;
}

}

现在我在想的是保持原样。意思是,OverlayView 占据了整个屏幕,我只需要在其他 OverlayViews 之间切换焦点就可以移动它们(我什至不知道这是否可能——在堆叠的 OverlayViews 之间切换焦点)但我担心浪费的空间影响内存和性能,因为图像只有 50x50。

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1 回答 1

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OverlayView 的大小在 onMeasure() 中计算。试试这个实现:

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) 
{
    int width = View.MeasureSpec.makeMeasureSpec(bitmap.getWidth(), MeasureSpec.EXACTLY);
    int height = View.MeasureSpec.makeMeasureSpec(bitmap.getHeight(), MeasureSpec.EXACTLY);
    setMeasuredDimension(width, height);
}

另请查看onMeasure的此实现。

于 2019-03-14T16:28:24.053 回答