Android 安卓-谷歌地图圈内视图

我想在圆形视图中显示地图，圆形的外部区域用颜色填充。我推荐了一个帖子。但现在的问题是触摸事件。地图可以通过外圆视图触摸，而我需要的地图只能从内圆视图（地图可见）触摸（缩放或移动）

我所尝试的，

setEnabled=false

可点击=错误

但仍然可以从外圆视图触摸地图

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
    }
}

这是可能实现的，地图可以从内圆视图触摸

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:

---

任何帮助都将不胜感激

您可以将

视图设置为您的
RadiusOverlayView
，并计算
RadiusOverlayView
是否需要管理触摸事件。
在本例中，我通过测试是否触摸了
RadiusOverlayView
颜色来计算它！=0（可能您希望对此进行改进）：

只是澄清一下，如果我总是返回false，它就不会向右移动吗？不，如果你总是返回true，地图就不会移动。返回true意味着RadiusOverlayView的侦听器已使用该事件，从而避免将其传播到映射。唯一困难的是找到圆内外的xy（圆形状）并返回布尔值。你能帮我看一下吗，这样我就可以确保触摸发生在圆圈区域之外。我的示例的颜色检查是不够的？对不起，我的错误，我不理解返回值，但现在我理解了。。它工作得很好。