我做了一个简单的应用程序,一旦按下按钮就可以打开和关闭屏幕,代码不会出现任何错误,但它什么也没做。这是代码:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = (Button) findViewById(R.id.button1);
button.setOnClickListener(new View.OnClickListener() {
@SuppressLint("Wakelock")
@Override
public void onClick(View arg0) {
Log.d(TAG, String.valueOf(screenWakeLock));
if (screenWakeLock != null) {
if(screenWakeLock.isHeld())
Log.d(TAG, "wavelock held");
screenWakeLock.release();
screenWakeLock = null;
}else{
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
screenWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "screenWakeLock");
screenWakeLock.acquire();
Log.d(TAG, String.valueOf(screenWakeLock));
}
}
});
}
以及清单文件中的权限:
<uses-permission android:name="android.permission.WAKE_LOCK"></uses-permission>
<uses-permission android:name="android.permission.DEVICE_POWER"></uses-permission>
没有错误,但屏幕上没有任何反应。有谁知道为什么?
先感谢您!