package com.example.timing;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.os.PowerManager;import android.os.PowerManager.WakeLock;public class TimingActivity extends Activity {	PowerManager manager = null;	WakeLock lock = null;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_timing);		manager = (PowerManager) this.getSystemService(Context.POWER_SERVICE);		lock = manager.newWakeLock(PowerManager.SCREEN_DIM_WAKE_LOCK, "mylock");		// PARTIAL_WAKE_LOCK :保持CPU 运转，屏幕和键盘灯有可能是关闭的。		// SCREEN_DIM_WAKE_LOCK ：保持CPU 运转，允许保持屏幕显示但有可能是灰的，允许关闭键盘灯		// SCREEN_BRIGHT_WAKE_LOCK ：保持CPU 运转，允许保持屏幕高亮显示，允许关闭键盘灯		// FULL_WAKE_LOCK ：保持CPU 运转，保持屏幕高亮显示，键盘灯也保持亮度	}	@Override	protected void onPause() {		super.onPause();		lock.release();// 关闭长亮	}	@Override	protected void onResume() {		super.onResume();		lock.acquire();// 打开长亮	}}