按下键盘上的App按钮

Question

I'm trying to map a button in my fragment layout as a keypress on a keyboard. This is my button press:

Button down = (Button)(myView.findViewById(R.id.btnDOWN));

    down.setOnTouchListener(new View.OnTouchListener(){
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            Log.i(TAG, "Down pressed");
            return false;
        }
    });

I wasn't able to find any library which would allow me to do so, all I've found was reverse case, when a keyboard or controller press would be sent to device.

What I'm trying to generally do here, is an app that acts like a controller for RetroPie by using the phone as a bluetooth keyboard, with only the keys necessary for a specific controller.

Answer 1

The method you're using is not correct. you should use the setOnClickListener :

Here an example from Android official guide :

 public class MyActivity extends Activity {
     protected void onCreate(Bundle icicle) {
         super.onCreate(icicle);

         setContentView(R.layout.content_layout_id);

         final Button button = findViewById(R.id.button_id);
         button.setOnClickListener(new View.OnClickListener() {
             public void onClick(View v) {
                 // Perform action on click
             }
         });
     }
 }

If you're looking for continuos aka long click, you should change it to setOnLongClickListener :

down.setOnLongClickListener(new OnLongClickListener() { 
        @Override
        public boolean onLongClick(View v) {
            // TODO Auto-generated method stub
            return true;
        }
    });

It wasn't hard to find in this case the solution on this site