android ScreenObserver 实现打开锁屏键时，跳到指定的页面

package com.EleMenu_YuanXu_v12.Util;

import java.lang.reflect.Method;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.PowerManager;
import android.util.Log;

/**
* 实现当屏幕锁定时，打开会跳到制定的开始页面
* @author linyuancong
*
*/
public class ScreenObserver{
private static String TAG = "ScreenObserver";
private Context mContext;
//---屏幕广播接收
private ScreenBroadcastReceiver mScreenReceiver;
//---屏幕状态监听器
private ScreenStateListener mScreenStateListener;
private static Method mReflectScreenState;

public ScreenObserver(Context context){
mContext = context;
mScreenReceiver = new ScreenBroadcastReceiver();
try {
mReflectScreenState = PowerManager.class.getMethod("isScreenOn",
new Class[] {});
} catch (NoSuchMethodException nsme) {
Log.d(TAG, "API < 7," + nsme);
}
}

/**
* screen鐘舵�骞挎挱鎺ユ敹鑰� * @author zhangyg
*
*/
private class ScreenBroadcastReceiver extends BroadcastReceiver{
private String action = null;
@Override
public void onReceive(Context context, Intent intent) {
action = intent.getAction();
if(Intent.ACTION_SCREEN_ON.equals(action)){
mScreenStateListener.onScreenOn();
}else if(Intent.ACTION_SCREEN_OFF.equals(action)){
mScreenStateListener.onScreenOff();
}
}
}

/**
* 璇锋眰screen鐘舵�鏇存柊
* @param listener
*/
public void requestScreenStateUpdate(ScreenStateListener listener) {
mScreenStateListener = listener;
startScreenBroadcastReceiver();

firstGetScreenState();
}

/**
* 绗竴娆¤姹俿creen鐘舵�
*/
private void firstGetScreenState(){
PowerManager manager = (PowerManager) mContext
.getSystemService(Activity.POWER_SERVICE);
if (isScreenOn(manager)) {
if (mScreenStateListener != null) {
mScreenStateListener.onScreenOn();
}
} else {
if (mScreenStateListener != null) {
mScreenStateListener.onScreenOff();
}
}
}

/**
* 鍋滄screen鐘舵�鏇存柊
*/
public void stopScreenStateUpdate(){
mContext.unregisterReceiver(mScreenReceiver);
}

/**
* 鍚姩screen鐘舵�骞挎挱鎺ユ敹鍣� */
private void startScreenBroadcastReceiver(){
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
mContext.registerReceiver(mScreenReceiver, filter);
}

/**
* screen鏄惁鎵撳紑鐘舵�
* @param pm
* @return
*/
private static boolean isScreenOn(PowerManager pm) {
boolean screenState;
try {
screenState = (Boolean) mReflectScreenState.invoke(pm);
} catch (Exception e) {
screenState = false;
}
return screenState;
}

public interface ScreenStateListener {
public void onScreenOn();
public void onScreenOff();
}

}

、-------下面是实现改类的方法

private ScreenObserver mScreenObserver;//---屏幕监听

//======初始化屏幕监听
private void initScreen() {
mScreenObserver = new ScreenObserver(this);

mScreenObserver.requestScreenStateUpdate(new ScreenStateListener() {
@Override
public void onScreenOn() {
doSomethingOnScreenOn();
}

@Override
public void onScreenOff() {
doSomethingOnScreenOff();
}

});

}
//当屏幕获得焦点时需要做的事情
private void doSomethingOnScreenOn() {

}
//当屏幕锁定时需要做的事情
private void doSomethingOnScreenOff() {
//------从这里修改需要显示的首页--------
Intent intent = new Intent(this,EleMenu_YuanXu_v12Activity.class);
startActivity(intent);
MainActivity.this.finish();
}
//----当销毁时要停止屏幕监听
@Override
protected void onDestroy() {
super.onDestroy();
//鍋滄鐩戝惉screen鐘舵�
mScreenObserver.stopScreenStateUpdate();
}

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