Android - Google CircleView 内的地图

Question

我想在圆形视图内显示地图，其中圆形的外部区域填充了一种颜色。我提到了 post Draw transparent circle filled outside。但现在的问题是触摸事件。可以通过外部圆形视图触摸地图，而我需要只能在内部圆形视图（地图可见）中触摸（缩放或移动）地图。

我试过的，

1. setEnabled=false
2. 可点击=假

但仍然从外部圆形视图触摸地图。

是否可以实现从圆形视图内可以触摸地图。

public class RadiusOverlayView extends LinearLayout {
    private Bitmap windowFrame;

    public RadiusOverlayView(Context context) {
        super(context);
    }

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

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

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public RadiusOverlayView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        super.dispatchDraw(canvas);

        if (windowFrame == null) {
            createWindowFrame(); // Lazy creation of the window frame, this is needed as we don't know the width & height of the screen until draw time
        }
        canvas.drawBitmap(windowFrame, 0, 0, null);
    }

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

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

    protected void createWindowFrame() {
        windowFrame = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888); // Create a new image we will draw over the map
        Canvas osCanvas = new Canvas(windowFrame); // Create a   canvas to draw onto the new image

        RectF outerRectangle = new RectF(0, 0, getWidth(), getHeight());

        Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); // Anti alias allows for smooth corners
        paint.setColor(Color.CYAN); // This is the color of your activity background
        osCanvas.drawRect(outerRectangle, paint);

        //paint.setColor(Color.TRANSPARENT); // An obvious color to help debugging
        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_OUT)); // A out B http://en.wikipedia.org/wiki/File:Alpha_compositing.svg
        float centerX = getWidth() / 2;
        float centerY = getHeight() / 2;
        float radius = Math.min(getWidth(), getHeight()) / 2 - 50;
        osCanvas.drawCircle(centerX, centerY, radius, paint);
    }

    @Override
    public boolean isInEditMode() {
        return true;
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        windowFrame = null; // If the layout changes null our frame so it can be recreated with the new width and height
    }
}

XML布局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">
    <!--loading map in container-->
    <FrameLayout
        android:id="@+id/container"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

    <mypackage.RadiusOverlayView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_centerInParent="true"
        />
</RelativeLayout>

结果：

如有任何帮助，我们将不胜感激。

Answer 1

您可以为您的RadiusOverlayView设置一个View.OnTouchListener并计算RadiusOverlayView是否需要管理触摸事件。 在这个例子中，我通过测试触摸的 RadiusOverlayView 颜色是否为 != 0（也许你想改进它）来计算：

final RadiusOverlayView radiusOverlayView = (RadiusOverlayView) findViewById(R.id.radiusView);
radiusOverlayView.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(final View view, final MotionEvent motionEvent) {
        view.setDrawingCacheEnabled(true);
        Bitmap bmp = Bitmap.createBitmap(view.getDrawingCache());
        view.setDrawingCacheEnabled(false);

        return bmp.getPixel((int) motionEvent.getX(), (int) motionEvent.getY()) != 0;
    }
});