javaandroidhome-button

Android: associate a method to home button of smartphone


how can I associate a method to home button of smartphone? I want that checking this botton my Android app does a specific method. I read that to disable home button there is the method:

getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

but it isn't useful for me. How can I solve this problem?


Solution

  • Use this code:

    HomeWatcher mHomeWatcher = new HomeWatcher(this);
    mHomeWatcher.setOnHomePressedListener(new OnHomePressedListener() {
        @Override
        public void onHomePressed() {
            // do something here...
        }
        @Override
        public void onHomeLongPressed() {
        }
    });
    mHomeWatcher.startWatch();
    

    HomeWatcher:

    import android.content.BroadcastReceiver;
    import android.content.Context;
    import android.content.Intent;
    import android.content.IntentFilter;
    import android.util.Log;
    
    public class HomeWatcher {
    
        static final String TAG = "hg";
        private Context mContext;
        private IntentFilter mFilter;
        private OnHomePressedListener mListener;
        private InnerRecevier mRecevier;
    
        public HomeWatcher(Context context) {
            mContext = context;
            mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
        }
    
        public void setOnHomePressedListener(OnHomePressedListener listener) {
            mListener = listener;
            mRecevier = new InnerRecevier();
        }
    
        public void startWatch() {
            if (mRecevier != null) {
                mContext.registerReceiver(mRecevier, mFilter);
            }
        }
    
        public void stopWatch() {
            if (mRecevier != null) {
                mContext.unregisterReceiver(mRecevier);
            }
        }
    
        class InnerRecevier extends BroadcastReceiver {
            final String SYSTEM_DIALOG_REASON_KEY = "reason";
            final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions";
            final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";
            final String SYSTEM_DIALOG_REASON_HOME_KEY = "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(SYSTEM_DIALOG_REASON_KEY);
                    if (reason != null) {
                        Log.e(TAG, "action:" + action + ",reason:" + reason);
                        if (mListener != null) {
                            if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {
                                mListener.onHomePressed();
                            } else if (reason.equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {
                                mListener.onHomeLongPressed();
                            }
                        }
                    }
                }
            }
        }
    }
    

    OnHomePressedListener:

    public interface OnHomePressedListener {
        public void onHomePressed();
    
        public void onHomeLongPressed();
    }