创建系统覆盖窗口(始终在顶部) [英] Creating a system overlay window (always on top)

问题描述

我正在尝试创建一个始终位于顶部的按钮/可点击图像它始终位于所有窗口的顶部.

I'm trying to create an always-op-top button/clickable-image which stays on top of all the windows all the time.

证明概念是

• 这里 - 智能任务栏(在 AppBrain 上)
• 和这里 V1.4.0 侧边栏样式 SWKey - 按钮救星(在 xda-developers)

我已经成功并且现在有一个正在运行的服务.服务一直在屏幕左上角显示一些文字，同时用户可以以正常方式自由地与其他应用程序交互.

I have been successful and have a running service now. The service displays some text on top left corner of screen all the time while user can freely interact with rest of apps in normal manner.

我是什么做的是子类 ViewGroup 并将其添加到根窗口管理器标志 TYPE_SYSTEM_OVERLAY.现在我想添加一个按钮/可点击图像代替这个可以接收触摸事件的文本.一世尝试为整个 ViewGroup 覆盖onTouchEvent"，但确实如此不接收任何事件.

What I'm doing is subclass ViewGroup and add it to root window manager with flag TYPE_SYSTEM_OVERLAY. Now I want to add a button/clickable-image in place of this text which can receive touch events on itself. I tried overriding "onTouchEvent" for the whole ViewGroup but it does not receive any event.

如何只接收特定部分的事件我总是在顶部视图组?请建议.

How can I receive events only on certain parts of my always-on-top view group? Kindly suggest.

public class HUD extends Service {
    HUDView mView;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Toast.makeText(getBaseContext(),"onCreate", Toast.LENGTH_LONG).show();
        mView = new HUDView(this);
        WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
                0,
//              WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
//                      | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
                PixelFormat.TRANSLUCENT);
        params.gravity = Gravity.RIGHT | Gravity.TOP;
        params.setTitle("Load Average");
        WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
        wm.addView(mView, params);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Toast.makeText(getBaseContext(),"onDestroy", Toast.LENGTH_LONG).show();
        if(mView != null)
        {
            ((WindowManager) getSystemService(WINDOW_SERVICE)).removeView(mView);
            mView = null;
        }
    }
}

class HUDView extends ViewGroup {
    private Paint mLoadPaint;

    public HUDView(Context context) {
        super(context);
        Toast.makeText(getContext(),"HUDView", Toast.LENGTH_LONG).show();

        mLoadPaint = new Paint();
        mLoadPaint.setAntiAlias(true);
        mLoadPaint.setTextSize(10);
        mLoadPaint.setARGB(255, 255, 0, 0);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        canvas.drawText("Hello World", 5, 15, mLoadPaint);
    }

    @Override
    protected void onLayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) {
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        //return super.onTouchEvent(event);
        Toast.makeText(getContext(),"onTouchEvent", Toast.LENGTH_LONG).show();
        return true;
    }
}

推荐答案

这可能是一个愚蠢的解决方案.但它有效.如果你能改进它，请告诉我.

This might be a stupid solution. But it works. If you can improve it, please let me know.

您的服务的创建:我使用了 WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH 标志.这是服务的唯一变化.

OnCreate of your Service: I have used WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH flag. This is the only change in service.

@Override
    public void onCreate() {
        super.onCreate();
        Toast.makeText(getBaseContext(),"onCreate", Toast.LENGTH_LONG).show();
        mView = new HUDView(this);
        WindowManager.LayoutParams params = new WindowManager.LayoutParams(
                WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY,
                WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH,
                PixelFormat.TRANSLUCENT);
        params.gravity = Gravity.RIGHT | Gravity.TOP;
        params.setTitle("Load Average");
        WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
        wm.addView(mView, params);
    }

现在，您将开始获取每个点击事件.因此，您需要在事件处理程序中进行纠正.

Now, you will start getting each and every click event. So, you need to rectify in your event handler.

在您的 ViewGroup 触摸事件中

In your ViewGroup touch event

@Override
public boolean onTouchEvent(MotionEvent event) {

    // ATTENTION: GET THE X,Y OF EVENT FROM THE PARAMETER
    // THEN CHECK IF THAT IS INSIDE YOUR DESIRED AREA


    Toast.makeText(getContext(),"onTouchEvent", Toast.LENGTH_LONG).show();
    return true;
}

此外，您可能还需要将此权限添加到清单中:

Also you may need to add this permission to your manifest:

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" />

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