android 音量按键,Android 音量键的监听

实践后的结论:

下面两种都可以获取到音量键的东西,  测试的时候,发现

KeyEvent.KEYCODE_VOLUME_UP 一直按住的时候, 三星的一款平板计数到200,就不在触发该事件;

所以改为 KeyEvent.ACTION_DOWN 时启动一个方法用来计数, KeyEvent.ACTION_UP的停止技数;

package com.akm.testvolume;

import android.app.Activity;

import android.os.Bundle;

import android.view.KeyEvent;

import android.widget.TextView;

public class MainActivity extends Activity {

private TextView tv;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

tv = (TextView) findViewById(R.id.tv);

}

int count = -1;

@Override

public boolean dispatchKeyEvent(KeyEvent event) {

int action = event.getAction();

if (action ==KeyEvent.ACTION_DOWN) {

tv.setText(