Android實現廣播監聽HOME鍵操作

先寫了個Service，在服務中通過廣播來監聽HOME鍵操作:
public class HomeService extends Service{
private MonitoHomeReceiver mHomeBroadcastReceiver;
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onCreate() {
super.onCreate();
mHomeBroadcastReceiver = new MonitoHomeReceiver();
/**

Android對屏幕下方常用按鍵消息處理是不一致的：
1、搜索按鍵的消息在onKeyDown或者onKeyUp中接收；
2、菜單按鍵的消息在onCreateOptionsMenu、onKeyDown或onKeyUp方法中接收；
3、返回按鍵的消息可以在onBackPressed、onKeyDown或onKeyUp方法中接收。
對于Home按鍵消息的處理，既不能通過onKeyDown、onKeyUp接收到，android也沒有提供專有的方法接收按鍵消息
但辦法總是有的，點擊Home按鍵時都會發出一個action為Intent.ACTION_CLOSE_SYSTEM_DIALOGS的廣播，通過注冊它來監聽Home按鍵消息
*/
IntentFilter homeFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
registerReceiver(mHomeBroadcastReceiver, homeFilter);
}
public class MonitoHomeReceiver extends BroadcastReceiver{
final String HOME_DIALOG_REASON = "homereason";
final String HOME_DIALOG_REASON_HOME = "homekey";

@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {
String reason = intent.getStringExtra(HOME_DIALOG_REASON);
if (reason != null && reason.equals(HOME_DIALOG_REASON_HOME)) {
Toast.makeText(getApplicationContext(), "點擊Home鍵", Toast.LENGTH_SHORT).show();
return;
}
}
}
}
@Override
public void onDestroy() {
unregisterReceiver(mHomeBroadcastReceiver);
mHomeBroadcastReceiver = null;
super.onDestroy();
}
}
然后在Activity中啟動Service:
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/*按鈕點擊事件/
findViewById(R.id.test_home_btn).setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this,HomeService.class);
startService(intent);
}
});
}
}
最后就是個簡單的布局文件：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android&quot;
    xmlns:tools="http://schemas.android.com/tools&quot;
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

<Button
    android:id="@+id/test_home_btn"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="測試Home鍵" />


</LinearLayout>
最后不要忘記在AndroidManifest.xml中用<Service></Service>標簽注冊HomeService 服務。
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