首先要在AndroidManifest中加許可權

    <uses-permission android:name="android.permission.WAKE_LOCK"/>
    <uses-permission android:name="android.permission.DEVICE_POWER" />

import android.os.BatteryStats.Uid.Wakelock;
import android.os.PowerManager;
import android.os.PowerManager.WakeLock;

getActivity()去獲取<pre name="code" class="java">getActivity().getSystemService
 

public class DoovTimerFragment extends DeskClockFragment

		mPowerManager = (PowerManager)getActivity().getSystemService(Context.POWER_SERVICE);
		mWakelock= mPowerManager.newWakeLock(PowerManager.FULL_WAKE_LOCK, "My Lock");
		
		screenOn=(Switch)v.findViewById(R.id.ScreenOn);
		if(screenOn.isChecked())
		{
			mWakelock.acquire();
		}
		screenOn.setOnCheckedChangeListener(new OnCheckedChangeListener() {
			
			@Override
			public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
				// TODO Auto-generated method stub
				
				if(screenOn.isChecked())
				{
					mWakelock.acquire();
				}else
				{
					mWakelock.release();
				}
			}
		});