Android通过Intent.ACTION_CLOSE_SYSTEM_DIALOGS监听Home按键消息

逆水行舟用力撑,一篙松劲退千寻。这篇文章主要讲述Android通过Intent.ACTION_CLOSE_SYSTEM_DIALOGS监听Home按键消息相关的知识,希望能为你提供帮助。
android对屏幕下方经常使用的四个按键消息处理是不一致的:
1、搜索按键的消息在onKeyDown或者onKeyUp中接收;
2、菜单按键的消息在onCreateOptionsMenu、onKeyDown或onKeyUp方法中接收;
3、返回按键的消息能够在onBackPressed、onKeyDown或onKeyUp方法中接收。


@Override public boolean onKeyDown(int keyCode, KeyEvent event) { switch( keyCode ){ case KeyEvent.KEYCODE_BACK:{} break; case KeyEvent.KEYCODE_MENU:{} break; case KeyEvent.KEYCODE_SEARCH:{} break; default:{} break; } return super.onKeyDown(keyCode, event); }@Override public boolean onKeyUp(int keyCode, KeyEvent event) { switch( keyCode ){ case KeyEvent.KEYCODE_BACK:{} break; case KeyEvent.KEYCODE_MENU:{} break; case KeyEvent.KEYCODE_SEARCH:{} break; default:{} break; } return super.onKeyUp(keyCode, event); }@Override public boolean onCreateOptionsMenu(Menu menu) { return true; }@Override public void onBackPressed() { super.onBackPressed(); }

    对于Home按键消息的处理,既不能通过onKeyDown、onKeyUp接收到,android也没有提供专有的方法接收按键消息,个人预计home按键算是一个app异常信息处理的后门,比方ANR后,按其他button没有比按Home按键好使。所以android为了可以提供更好的用户体验,没有提供供用户监听home按键消息的方法。
注:网上提供了各种各样监听Home按键消息的方法,但仅仅有这个比較好使。



    但办法总是有的,在每次点击Home按键时都会发出一个action为Intent.ACTION_CLOSE_SYSTEM_DIALOGS的广播,它是关闭系统Dialog的广播,我们能够通过注冊它来监听Home按键消息。我自己定义了一个home按键监听工具类。代码例如以下。使用说明參见类名上方的使用说明:

import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; /** * Home按键监听类 * 使用说明: * 1、初始化HomeListen * HomeListen homeListen = new HomeListen( this ); * homeListen.setOnHomeBtnPressListener( new setOnHomeBtnPressListener(){ *@Override *public void onHomeBtnPress( ){ *// 按下Home按键回调 *} * *@Override *public void onHomeBtnLongPress( ){ *// 长按Home按键回调 *} * }); * * 2、在onResume方法中启动HomeListen广播: * homeListen.start(); * * 3、在onPause方法中停止HomeListen广播: * homeListen.stop( ); * */ public class HomeListen { public HomeListen(Context context) { mContext = context; mHomeBtnReceiver = new HomeBtnReceiver( ); mHomeBtnIntentFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS); } public void setOnHomeBtnPressListener( OnHomeBtnPressLitener onHomeBtnPressListener ){ mOnHomeBtnPressListener = onHomeBtnPressListener; } public void start( ){ mContext.registerReceiver( mHomeBtnReceiver, mHomeBtnIntentFilter ); } public void stop( ){ mContext.unregisterReceiver( mHomeBtnReceiver ); } class HomeBtnReceiver extends BroadcastReceiver{ @Override public void onReceive(Context context, Intent intent) { receive( context, intent ); } } private void receive(Context context, Intent intent){ String action = intent.getAction(); if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) { String reason = intent.getStringExtra( " reason" ); if (reason != null) { if( null != mOnHomeBtnPressListener ){ if( reason.equals( " homekey" ) ){ // 按Home按键 mOnHomeBtnPressListener.onHomeBtnPress( ); }else if( reason.equals( " recentapps" ) ){ // 长按Home按键 mOnHomeBtnPressListener.onHomeBtnLongPress( ); } } } } } public interface OnHomeBtnPressLitener{ public void onHomeBtnPress( ); public void onHomeBtnLongPress( ); } private Context mContext = null; private IntentFilter mHomeBtnIntentFilter = null; private OnHomeBtnPressLitener mOnHomeBtnPressListener = null; private HomeBtnReceiver mHomeBtnReceiver = null; }


在Activity中做例如以下调用就可以:

public class HomeListenActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_home_listen_layout); initHomeListen( ); }@Override protected void onResume( ) { super.onResume(); mHomeListen.start( ); }@Override protected void onPause() { super.onPause(); mHomeListen.stop( ); }private void initHomeListen( ){ mHomeListen = new HomeListen( this ); mHomeListen.setOnHomeBtnPressListener( new OnHomeBtnPressLitener( ) { @Override public void onHomeBtnPress() { showToast( " 按下Home按键!" ); }@Override public void onHomeBtnLongPress() { showToast( " 长按Home按键!" ); } }); }private void showToast( String toastInfoStr ){ Toast.makeText( this, toastInfoStr, Toast.LENGTH_LONG ).show( ); }private HomeListen mHomeListen = null; }



Demo程序下载地址:Android监听Home按键
【Android通过Intent.ACTION_CLOSE_SYSTEM_DIALOGS监听Home按键消息】