Android如何收听音量按钮事件？ [英] Android How to listen for Volume Button events?

问题描述

我知道你们可能已经厌倦了这些帖子，但是为什么当我按下音量时没有任何事情发生？我只是想制作一个简单的代码，但显然它不起作用。

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.");
}

}

推荐答案

我不知道您是否可以获得硬件密钥的长按事件。

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

我之前使用此代码来监听音量按钮。

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;
    }

如果这对您不起作用，请告诉我们您正在测试的设备on。

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

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