Android 如何监听音量按钮事件？

Question

我知道你们可能已经厌倦了这些类型的帖子，但是当我按下音量时为什么没有任何反应？我只是想编写一个简单的代码，但显然它不起作用。

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

我不知道你是否可以获得硬件键的长按事件。

我之前用这个代码来监听音量按钮。

@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什么设备。

科特林

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

Answer 2

另一种方法

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
    int action = event.getAction();
    int keyCode = event.getKeyCode();
        switch (keyCode) {
        case KeyEvent.KEYCODE_VOLUME_UP:
            if (action == KeyEvent.ACTION_DOWN) {
                //TODO
            }
            return true;
        case KeyEvent.KEYCODE_VOLUME_DOWN:
            if (action == KeyEvent.ACTION_DOWN) {
                //TODO
            }
            return true;
        default:
            return super.dispatchKeyEvent(event);
        }
    }

Answer 3

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if ((keyCode == KeyEvent.KEYCODE_VOLUME_DOWN)) {
        // ... your code
        return true;
    } else if ((keyCode == KeyEvent.KEYCODE_VOLUME_UP)) {
        // ... your code
        return true;
    } else
        return super.onKeyDown(keyCode, event);
}

Answer 4

试试这些。刚刚对它们进行了测试：

@Override
public boolean onKeyLongPress(int keyCode, KeyEvent event) {
    super.onKeyLongPress(keyCode, event);
    if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
        Log.w("LightWriter", "I WORK BRO.");
        return true;
    }
    return false;
}

public boolean onKeyDown(int keyCode, KeyEvent event) {
    super.onKeyDown(keyCode, event);
    if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
        Log.w("LightWriter", "I WORK BRO.");
        return true;
    }
    return true;
}

Answer 5

使用此代码处理音量键事件

@Override
public boolean onKeyUp(int keyCode, KeyEvent event) {
    super.onKeyUp(keyCode, event);
    if (keyCode == KeyEvent.KEYCODE_VOLUME_UP)
    {
        Toast.makeText(MainActivity.this,"Up working",Toast.LENGTH_SHORT).show();
        return true;
    }
    return false;
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
    super.onKeyDown(keyCode, event);
    if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN)
    {
        Toast.makeText(MainActivity.this,"Down working",Toast.LENGTH_SHORT).show();
        return true;
    }
    return false;
}