Android How to listen for Volume Button events?

Question

I know you guys are probably tired of these kinds of posts, but why doesn't anything happen when I press volume down? I'm just trying to make a simple code, but apparently it's not working.

package com.cakemansapps.lightwriter; import android.app.Activity; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.FrameLayout; import android.view.KeyEvent; import android.util.Log;  public class LightWriter extends Activity implements OnTouchListener { private static final String TAG = "Touch" ; @Override public void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.main);   FrameLayout main = (FrameLayout) findViewById(R.id.main_view); }  @Override public boolean onKeyLongPress(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN)  {     Log.w("LightWriter", "I WORK BRO.");     return true; } return super.onKeyLongPress(keyCode, event); }  public boolean onTouch(View view, MotionEvent me) {     throw new UnsupportedOperationException("Not supported yet."); }  } 

Answer 1

I don't know if you can get long press events for the hardware keys.

I've used this code to listen for the volume button before.

@Override public boolean onKeyDown(int keyCode, KeyEvent event) {     if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN){         // Do something     }     return true; } 

If that doesn't work for you let us know what device you are testing on.

Kotlin

override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {     if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {          // Do something     }     return true }