Question

当屏幕打开时，我想检查电源按钮是否激活它，如果是，它将自动关闭键盘锁并运行吐司。

当屏幕关闭时，将重新启用键盘锁。（代码可以在这里工作）

但是，当屏幕关闭时，按下“音量调高”按钮，屏幕会亮起。（但它进入循环，它检测到“电源”按钮被按下）。

当按下其他按钮（“电源”按钮除外）时，应该不应激活“关闭键盘锁”。

任何帮助都非常感谢解决这个错误：）

另一个问题 - 如何在服务中使用FLAG_DISMISS_KEYGUARD？

public class myService extends Service{

@Override
public IBinder onBind(Intent arg0) {
    // TODO Auto-generated method stub
    return null;
}

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

}

@Override
public void onStart(Intent intent, int startId) {
    boolean screenOn = intent.getBooleanExtra("screen_state", false);
    boolean pressed = false;       
    Vibrator myVib;

    //screen is turned on
    if (!screenOn) 
    {
        pressed = onKeyDown(26, null);

        //if it turned on by power button. bug = always go into this loop
        if(pressed)
        {
            Context context = getApplicationContext();
            CharSequence text = "Service started. power button pressed";
            int duration = Toast.LENGTH_SHORT;

            Toast toast = Toast.makeText(context, text, duration);
            toast.show();               

            //dimiss keyguard
            KeyguardManager keyguardManager = (KeyguardManager)getSystemService(Activity.KEYGUARD_SERVICE);
            KeyguardLock lock = keyguardManager.newKeyguardLock(KEYGUARD_SERVICE);
            lock.disableKeyguard();


            Context context2 = getApplicationContext();
            CharSequence text2 = "SCREEN ON";
            int duration2 = Toast.LENGTH_SHORT;

            Toast toast2 = Toast.makeText(context2, text2, duration2);
            toast2.show();

        }           
        else
        {
            Context context = getApplicationContext();
            CharSequence text = "Service started. NOT power button pressed";
            int duration = Toast.LENGTH_SHORT;

            Toast toast = Toast.makeText(context, text, duration);
            toast.show();
        }

    }

    //screen is turned off
    else {
        myVib = (Vibrator) this.getSystemService(VIBRATOR_SERVICE);
        myVib.vibrate(500);

        KeyguardManager keyguardManager = (KeyguardManager)getSystemService(Activity.KEYGUARD_SERVICE);
        KeyguardLock lock = keyguardManager.newKeyguardLock(KEYGUARD_SERVICE);
        lock.reenableKeyguard();

    }
}

 public boolean onKeyDown(int keyCode, KeyEvent event) {
     if(keyCode == KeyEvent.KEYCODE_POWER)
         return true;
     else
        return false;
 }
}//end of myService class

Answer 1

好的，所以这并不像看起来那么简单服务实际上不能拥有当前正在运行的活动，但您需要一个活动来获取对窗口的引用

所以你可以通过几种不同的方式做到这一点。

Turning off the screen from a service
在这个问题的答案中，创建了一个虚拟活动（一个没有膨胀的）并且用来获得窗口（但是工作但是不确定如果未充气的活动导致泄漏或其他问题。再加上看起来有点像肮脏的黑客）

或者.....

CommonWares方式

how can i get the current foreground activity from a service
您可以在服务广播意图时触发的回调中处理实际的窗口操作对将要做这件事的活动。（更好的设计，但更多的archetectural返工） Example

一旦你决定你想做什么（我会建议＃2）以下应该可以工作，但请注意我没有测试过。

//Get the window from the context
WindowManager wm = Context.getSystemService(Context.WINDOW_SERVICE);

//Unlock
//http://developer.android.com/reference/android/app/Activity.html#getWindow()
Window window = getWindow();  
window.addFlags(wm.LayoutParams.FLAG_DISMISS_KEYGUARD);  

//Lock device
DevicePolicyManager mDPM;
mDPM = (DevicePolicyManager)getSystemService(Context.DEVICE_POLICY_SERVICE);

KeyguardManager FLAG_DISMISS_KEYGUARD服务

1 个答案:

CommonWares方式