Android監聽Home鍵、多任務鍵

實作方式

監聽BroadcastReceiver

事件

• Intent.ACTION_CLOSE_SYSTEM_DIALOGS

具體實作

• 1、建立監聽接口

public interface HomeStatusListener {
    
    void onHomeKey();

    void onRecentApps();
}
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實作兩個方法：home鍵、最近app

• 2、建立工具類

public class HomeStatusController {

    //定義監聽傳回常量
    private static final String SYSTEM_DIALOG_REASON_KEY = "reason";
    private static final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";
    private static final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";
    
    private Context mContext;
    private IntentFilter mHomeStatusFilter = null;
    private HomeStatusListener mHomeStatusListener;
    
    /**
     * 構造函數執行個體IntentFilter對象
     * @param context
     */
    public HomeStatusController(Context context) {
        mContext = context;
        mHomeStatusFilter = new IntentFilter();
        mHomeStatusFilter.addAction(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
    }
    
    private BroadcastReceiver mHomeStatusReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (Intent.ACTION_CLOSE_SYSTEM_DIALOGS.equals(action)) {
                String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);
                if (TextUtils.isEmpty(reason)) {
                    return;
                }
                if (SYSTEM_DIALOG_REASON_HOME_KEY.equals(reason)) {
                    if(mHomeStatusListener!=null){
                        mHomeStatusListener.onHomeKey();
                    }
                } else if (reason.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
                    if(mHomeStatusListener!=null){
                        mHomeStatusListener.onRecentApps();
                    }
                }

            }
        }
    };
    
    
    //設定監聽
    public void setHomeStatusListener(HomeStatusListener l) {
        mHomeStatusListener = l;
    }
    
    //開始監聽
    public void startListen() {
        if (mContext != null) {
            mContext.registerReceiver(mHomeStatusReceiver, mHomeStatusFilter);
        }
    }

    //結束監聽
    public void stopListen() {
        if (mContext != null) {
            mContext.unregisterReceiver(mHomeStatusReceiver);
        }
    }
    
}

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控制工具主要是實作了廣播的注冊和回收，并處理廣播事件

• 3、廣播實作

public class MainActivity extends Activity{
    private HomeStatusController  mHomeStatusController = null;
     
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
        //TODO
        
        mHomeStatusController = new HomeStatusController(this);
        mHomeStatusController.setHomeStatusListener(new HomeStatusListener() {
            @Override
            public void onHomeKey() {
            }

            @Override
            public void onRecentApps() {

            }
        });
        mHomeStatusController.startListen();
    }
    
    @Override
    protected void onDestroy() {
        mHomeStatusController.stopListen();
        super.onDestroy();
        
    }
}
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實作按下Home鍵的效果

Intent intent= new Intent(Intent.ACTION_MAIN);  
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK); //如果是服務裡調用，必須加入new task辨別    
intent.addCategory(Intent.CATEGORY_HOME);
startActivity(intent);  
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