【Android 進階】Android Home 鍵監聽

標籤：靜態   null   tac   end   bool   textutils   取出   比較   roi   

Android Home鍵監聽

Android 普通索引值可以直接在dispatchKeyEvent（）中處理，但Home鍵，比較特殊，需要單獨監聽其廣播，且必須為動態廣播，其靜態廣播無效；

需求：Home鍵，設定 Kill 自己，但設定中有多個Activity，在每個Activiy 中年監聽Home鍵廣播不現實，必須把監聽廣播抽取出來在同一個類中實現，考慮到BaseActivity；

public class BaseActivity extends Activity {    private HomeWatcherReceiver mHomeWatcherReceiver = null;    private boolean isNeedFinish = false;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        registerReceiver();    }    public void setBackFinish(boolean flag) {        isNeedFinish = flag;    }    private void registerReceiver() {        mHomeWatcherReceiver = new HomeWatcherReceiver();        IntentFilter filter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);        registerReceiver(mHomeWatcherReceiver, filter);    }    @Override    public boolean dispatchKeyEvent(KeyEvent event) {        int KeyCode = event.getKeyCode();        if (event.getAction() == KeyEvent.ACTION_DOWN) {            if (event.getKeyCode() == KeyEvent.KEYCODE_BACK) {                this.finish();                System.gc();                return true;            }        }        return super.dispatchKeyEvent(event);    }    public class HomeWatcherReceiver extends BroadcastReceiver {        private static final String SYSTEM_DIALOG_REASON_KEY = "reason";        private static final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";        @Override        public void onReceive(Context context, Intent intent) {            String intentAction = intent.getAction();            Log.i(MyAPP, "intentAction =" + intentAction);            if (TextUtils.equals(intentAction, Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {                String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);                Log.i(MyAPP, "reason =" + reason);                if (TextUtils.equals(SYSTEM_DIALOG_REASON_HOME_KEY, reason)) {                    BaseActivity.this.finish();                }            }        }    }    @Override    protected void onDestroy() {        super.onDestroy();        if (mHomeWatcherReceiver != null) {            try {                unregisterReceiver(mHomeWatcherReceiver);            }            catch (Exception e) {                e.printStackTrace();            }        }    }}

 

【Android 進階】Android Home 鍵監聽