今天，簡單講講如何監聽手機屏幕是否鎖屏。

實現方法：1）通過BroadcastReceiver接收廣播Intent.ACTION_SCREEN_ON和Intent.ACTION_SCREEN_OFF可以判斷屏幕狀態是否鎖屏，但是只有屏幕狀態發生改變時才會發出廣播；

2）如果要在屏幕狀態發生改變之前就想獲取屏幕狀態，可以通過反射機制調用PowerManager的isScreenOn方法 。

具體實現，見代碼：

直接上代碼：

1.定義一個接收廣播的類

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狀態廣播接收者*/private class ScreenBroadcastReceiver extends BroadcastReceiver {private String action = null;@Overridepublic void onReceive(Context context, Intent intent) {action = intent.getAction();if (Intent.ACTION_SCREEN_ON.equals(action)) { // 開屏mScreenStateListener.onScreenOn();} else if (Intent.ACTION_SCREEN_OFF.equals(action)) { // 鎖屏mScreenStateListener.onScreenOff();} else if (Intent.ACTION_USER_PRESENT.equals(action)) { // 解鎖mScreenStateListener.onUserPresent();}}}/*** 開始監聽screen狀態** @param listener*/public void begin(ScreenStateListener listener) {mScreenStateListener = listener;registerListener();getScreenState();}/*** 獲取screen狀態*/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狀態監聽*/public void unregisterListener() {mContext.unregisterReceiver(mScreenReceiver);}/*** 啟動screen狀態廣播接收器*/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 {// 返回給調用者屏幕狀態信息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 ;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);screenListener = new ScreenListener( MainActivity.this ) ;screenListener.begin(new ScreenListener.ScreenStateListener() {@Overridepublic void onScreenOn() {Toast.makeText( MainActivity.this , "屏幕打開了" , Toast.LENGTH_SHORT ).show();}@Overridepublic void onScreenOff() {Toast.makeText( MainActivity.this , "屏幕關閉了" , Toast.LENGTH_SHORT ).show();}@Overridepublic void onUserPresent() {Toast.makeText( MainActivity.this , "解鎖了" , Toast.LENGTH_SHORT ).show();}});}}

android 監聽屏幕是否鎖屏就講完了。

就這么簡單。

總結

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