【移动应用开发技术】Android中怎么监听屏幕是否锁屏

【移动应用开发技术】Android中怎么监听屏幕是否锁屏

本篇文章给大家分享的是有关Android中怎么监听屏幕是否锁屏，在下觉得挺实用的，因此分享给大家学习，希望大家阅读完这篇文章后可以有所收获，话不多说，跟着在下一起来看看吧。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package

com.app.lib;

import

android.content.BroadcastReceiver;

import

android.content.Context;

import

android.content.Intent;

import

android.content.IntentFilter;

import

android.os.PowerManager;

/**

*

Created

by

${zyj}

on

2016/6/21.

*/

public

class

ScreenListener

{

private

Context

mContext;

private

ScreenBroadcastReceiver

mScreenReceiver;

private

ScreenStateListener

mScreenStateListener;

public

ScreenListener(Context

context)

{

mContext

=

context;

mScreenReceiver

=

new

ScreenBroadcastReceiver();

}

/**

*

screen状态广播接收者

*/

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))

{

//

开屏

mScreenStateListener.onScreenOn();

}

else

if

(Intent.ACTION_SCREEN_OFF.equals(action))

{

//

锁屏

mScreenStateListener.onScreenOff();

}

else

if

(Intent.ACTION_USER_PRESENT.equals(action))

{

//

解锁

mScreenStateListener.onUserPresent();

}

}

}

/**

*

开始监听screen状态

*

*

@param

listener

*/

public

void

begin(ScreenStateListener

listener)

{

mScreenStateListener

=

listener;

registerListener();

getScreenState();

}

/**

*

获取screen状态

*/

private

void

getScreenState()

{

PowerManager

manager

=

(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

*/

public

void

unregisterListener()

{

mContext.unregisterReceiver(mScreenReceiver);

}

/**

*

启动screen状态广播接收器

*/

private

void

registerListener()

{

IntentFilter

filter

=

new

IntentFilter();

filter.addAction(Intent.ACTION_SCREEN_ON);

filter.addAction(Intent.ACTION_SCREEN_OFF);

filter.addAction(Intent.ACTION_USER_PRESENT);

mContext.registerReceiver(mScreenReceiver,

filter);

}

public

interface

ScreenStateListener

{//

返回给调用者屏幕状态信息

public

void

onScreenOn();

public

void

onScreenOff();

public

void

onUserPresent();

}

}2、使用：package

com.app.lib;

import

android.support.v7.app.AppCompatActivity;

import

android.os.Bundle;

import

android.widget.Toast;

public

class

MainActivity

extends

AppCompatActivity

{

private

ScreenListener

screenListener

;

@Override

protected

void

onCreate(Bundle

savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

screenListener

=

new

ScreenListener(

MainActivity.this

)

;

screenListener.begin(new

ScreenListener.ScreenStateListener()

{

@Override

public

void

onScreenOn()

{

Toast.makeText(

MainActivity.this

,

"屏幕打开了"

,

Toast.LENGTH_SHORT

).show();

}

@Override

public

void

onScreenOff()

{

Toast.makeText(

MainActivity.this

,

"屏幕关闭了"

,

Toast.LENGTH_SHO