============问题描述============

我想要在应用弹出对话框，程序在后台运行，当达到条件后弹出对话框并有震动和铃声，但是在锁屏状态下却没反应，有什么办法解决吗？

============解决方案1============

// 解锁KeyguardManager manager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);if( manager.inKeyguardRestrictedInputMode() ){//处于锁定界面,界面则通过KeyguardLock类方法来解锁KeyguardLock keyguard = manager.newKeyguardLock(getLocalClassName());keyguard.disableKeyguard();}

解锁需要权限：
<uses-permission android:name="android.permission.DISABLE_KEYGUARD"/>

//点亮屏幕PowerManager pm = (PowerManager)getSystemService(POWER_SERVICE);mWakelock = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP |PowerManager.SCREEN_DIM_WAKE_LOCK, "SimpleTimer");mWakelock.acquire();//.......mWakelock.release();

点亮屏幕需要权限：
<uses-permission android:name="android.permission.WAKE_LOCK"/>

============解决方案2============

按照LS的方法 请求强制打开锁，会出现按Power键,系统也不会进入Sleep的现象

建议参考如下方法，让对话框在锁屏界面上方显示
onCreate方法时使用
    requestWindowFeature(Window.FEATURE_NO_TITLE); //hide title
    Window win = getWindow();
    WindowManager.LayoutParams winParams = win.getAttributes();
    winParams.flags |= (WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD
            | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
            | WindowManager.LayoutParams.FLAG_ALLOW_LOCK_WHILE_SCREEN_ON
            | WindowManager.LayoutParams.FLAG_TURN_SCREEN_ON);
    setRequestedOrientation(0);

在OnResume时使用
     protected void onResume() {
        super.onResume();
        acquireWakeLock();
     }
    
     private void acquireWakeLock() {
         if (mWakelock == null) {
             Log.i(TAG, "Activity begin start ");
             PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
             mWakelock = pm.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK,     this.getClass().getCanonicalName());
             mWakelock.acquire();
    }

在onPause
     protected void onPause() {
         super.onPause();
         ......
         releaseWakeLock();
     }
     
     private void releaseWakeLock() {
        if (mWakelock != null && mWakelock.isHeld()) {
            mWakelock.release();
            mWakelock = null;
     }
希望对LZ有所帮助！