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我想尝试使用系统服务,如wakelock,但由于某种原因,当我运行它的错误说“系统服务不可用的onCreate()之前的活动()”我试着改变一点点wakelock通过将newWakeLock移动到oncreate()
来解决问题,但这仍然无效,有什么可以解决这个问题?Android系统服务不可用错误
public class MainActivity extends ListActivity {
String[] activities = {"package1", "package2", "package3"};
private PowerManager powerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
//@SuppressWarnings("deprecation")
private PowerManager.WakeLock wakeLock; //= powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK, "My Tag");
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
wakeLock = powerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK, "My Tag");
wakeLock.acquire();
this.setListAdapter(new ArrayAdapter (this, android.R.layout.simple_expandable_list_item_1, activities));
}
public void onPause(){
wakeLock.release();
}
public void onResume(){ }
public void onDestroy(){ }
/* public void onListItemClick(ListView, View, int, long){ }*/
}