Android Facebook锁屏通知

Question

在Android应用程序的最新版本Facebook上显示锁定屏幕通知功能,就像在这个截图上:

有没有人试图实现这个？

我知道在锁定屏幕上显示Activity很简单,但遗憾的是它不适用于半透明背景.基本上它工作,但在我们的活动下面,我们看到启动器屏幕,而不是锁定屏幕(在这种情况下像锁屏也将是透明的).

我现在尝试的是:

getWindow().addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);

在我的活动中.

我也试过这个例子:https://gist.github.com/daichan4649/5352944

正如我所描述的 - 一切正常但没有透明度.

根据我的观察,Facebook使用主题:

@android:style/Theme.Translucent.NoTitleBar

并且没有许可:

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

此外,我注意到锁定屏幕通知会获取触摸,因此我们无法通过手势显示状态栏中的通知.

任何想法如何在Android L发布之前创建这种通知.

Answer 1

实际上,ferdy182是/正在做什么.

这是我使用的android.permission.SYSTEM_ALERT_WINDOW:

所以,我不能这样做Activity.它只是行不通.我必须实现一个Service添加了View使用的WindowManager.

一个可能的工作流程是:您的接收广播BroadcastReceiver=>它启动服务=>服务添加所需的视图.

现在,代码(评论解释了一些事情):

public class MyService extends Service {

    View mView;

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

    @Override
    public void onCreate() {
        super.onCreate();

        // instance of WindowManager
        WindowManager mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);

        LayoutInflater mInflater = (LayoutInflater) 
                                      getSystemService(Context.LAYOUT_INFLATER_SERVICE);

        // inflate required layout file
        mView = mInflater.inflate(R.layout.abc, null);

        // attach OnClickListener
        mView.findViewById(R.id.some_id).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // you can fire an Intent accordingly - to deal with the click event
                // stop the service - this also removes `mView` from the window
                // because onDestroy() is called - that's where we remove `mView`
                stopSelf();
            }
        });

        // the LayoutParams for `mView`
        // main attraction here is `TYPE_SYSTEM_ERROR`
        // as you noted above, `TYPE_SYSTEM_ALERT` does not work on the lockscreen
        // `TYPE_SYSTEM_OVERLAY` works very well but is focusable - no click events
        // `TYPE_SYSTEM_ERROR` supports all these requirements
        WindowManager.LayoutParams mLayoutParams = new WindowManager.LayoutParams(
            ViewGroup.LayoutParams.WRAP_CONTENT, 
            ViewGroup.LayoutParams.WRAP_CONTENT, 0, 0,
            WindowManager.LayoutParams.TYPE_SYSTEM_ERROR,
            WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                    | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
                    | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON
                    | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, 
                      PixelFormat.RGBA_8888);

        // finally, add the view to window
        mWindowManager.addView(mView, mLayoutParams);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();

        // remove `mView` from the window
        removeViewFromWindow();
    }

    // Removes `mView` from the window
    public void removeNow() {
        if (mView != null) {
            WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);
            wm.removeView(mView);
        }
    }
}

最后,将权限添加到应用的清单中:

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