android 黑屏状态下，开屏代码

public class WakeUpScreen extends Activity {    PowerManager.WakeLock wakeLock;    String TAG="started";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);        KeyguardManager keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);        KeyguardLock keyguardLock = keyguardManager.newKeyguardLock("");        if( !pm.isScreenOn() )        {            wakeLock = pm.newWakeLock(PowerManager.ACQUIRE_CAUSES_WAKEUP |PowerManager.SCREEN_DIM_WAKE_LOCK, this.getClass().getCanonicalName());            wakeLock.acquire();                keyguardLock.disableKeyguard();        }else{            keyguardLock.reenableKeyguard();        }        Intent intent=new Intent();        intent.setClass(this, AgainstTheft.class);        startActivity(intent);        this.lockScreen();    }    @Override    protected void onPause() {        super.onPause();        wakeLock.release();    }    @Override    protected void onDestroy() {        super.onDestroy();    }}
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