怎样在安卓中实现在锁屏状态下弹出对话框，并可以震动和铃声，就像闹钟似的？

Question

// 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"/>

Answer 1

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！