Android 监听屏幕是否锁屏的实例代码
今天，简单讲讲如何监听手机屏幕是否锁屏。
实现方法：
1）通过BroadcastReceiver接收广播Intent.ACTION_SCREEN_ON和Intent.ACTION_SCREEN_OFF可以判断屏幕状态是否锁屏，但是只有屏幕状态发生改变时才会发出广播；
2）如果要在屏幕状态发生改变之前就想获取屏幕状态，可以通过反射机制调用PowerManager的isScreenOn方法。
具体实现，见代码：
直接上代码：
1.定义一个接收广播的类
packagecom.app.lib;
importandroid.content.BroadcastReceiver;
importandroid.content.Context;
importandroid.content.Intent;
importandroid.content.IntentFilter;
importandroid.os.PowerManager;
/**
*Createdby${zyj}on2016/6/21.
*/
publicclassScreenListener{
privateContextmContext;
privateScreenBroadcastReceivermScreenReceiver;
privateScreenStateListenermScreenStateListener;
publicScreenListener(Contextcontext){
mContext=context;
mScreenReceiver=newScreenBroadcastReceiver();
}
/**
*screen状态广播接收者
*/
privateclassScreenBroadcastReceiverextendsBroadcastReceiver{
privateStringaction=null;
@Override
publicvoidonReceive(Contextcontext,Intentintent){
action=intent.getAction();
if(Intent.ACTION_SCREEN_ON.equals(action)){//开屏
mScreenStateListener.onScreenOn();
}elseif(Intent.ACTION_SCREEN_OFF.equals(action)){//锁屏
mScreenStateListener.onScreenOff();
}elseif(Intent.ACTION_USER_PRESENT.equals(action)){//解锁
mScreenStateListener.onUserPresent();
}
}
}
/**
*开始监听screen状态
*
*@paramlistener
*/
publicvoidbegin(ScreenStateListenerlistener){
mScreenStateListener=listener;
registerListener();
getScreenState();
}
/**
*获取screen状态
*/
privatevoidgetScreenState(){
PowerManagermanager=(PowerManager)mContext
.getSystemService(Context.POWER_SERVICE);
if(manager.isScreenOn()){
if(mScreenStateListener!=null){
mScreenStateListener.onScreenOn();
}
}else{
if(mScreenStateListener!=null){
mScreenStateListener.onScreenOff();
}
}
}
/**
*停止screen状态监听
*/
publicvoidunregisterListener(){
mContext.unregisterReceiver(mScreenReceiver);
}
/**
*启动screen状态广播接收器
*/
privatevoidregisterListener(){
IntentFilterfilter=newIntentFilter();
filter.addAction(Intent.ACTION_SCREEN_ON);
filter.addAction(Intent.ACTION_SCREEN_OFF);
filter.addAction(Intent.ACTION_USER_PRESENT);
mContext.registerReceiver(mScreenReceiver,filter);
}
publicinterfaceScreenStateListener{//返回给调用者屏幕状态信息
publicvoidonScreenOn();
publicvoidonScreenOff();
publicvoidonUserPresent();
}
}
2、使用：
packagecom.app.lib;
importandroid.support.v7.app.AppCompatActivity;
importandroid.os.Bundle;
importandroid.widget.Toast;
publicclassMainActivityextendsAppCompatActivity{
privateScreenListenerscreenListener;
@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
screenListener=newScreenListener(MainActivity.this);
screenListener.begin(newScreenListener.ScreenStateListener(){
@Override
publicvoidonScreenOn(){
Toast.makeText(MainActivity.this,"屏幕打开了",Toast.LENGTH_SHORT).show();
}
@Override
publicvoidonScreenOff(){
Toast.makeText(MainActivity.this,"屏幕关闭了",Toast.LENGTH_SHORT).show();
}
@Override
publicvoidonUserPresent(){
Toast.makeText(MainActivity.this,"解锁了",Toast.LENGTH_SHORT).show();
}
});
}
}
总结
以上所述是小编给大家介绍的Android监听屏幕是否锁屏的实例代码，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对毛票票网站的支持！