android音量控制测试

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android=""
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView
    android:layout_width="fill_parent"
    android:id="@+id/volumenum" android:layout_height="fill_parent" android:gravity="center" android:text="play" android:textSize="40dp"/>
</LinearLayout>

源码：

package com.demo;

import android.app.Activity;
import android.content.Context;
import android.media.AudioManager;
import android.media.SoundPool;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;

public class VolumeControl extends Activity {
    private AudioManager audioManager;
    private SoundPool spool;
    private int hit;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        setTitle("点击play播放，使用音量加减键来调节音量！");
        final TextView volumenum = (TextView) findViewById(R.id.volumenum);

        // 创建对象
        // 第一个参数指定音频池的最大音频流数目为10
        // 第三个参数，声音品质为5
        spool = new SoundPool(10, AudioManager.STREAM_SYSTEM, 10);

        // 从资源或者文件截入音频流
        hit = spool.load(this, R.raw.msg, 0);

        volumenum.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                // 播放音频，可以对左右音量分别设置，可以设置优先级，循环次数以及速率
                // 速率最高2，最低0.5，正常为1
                float volumeNum = (float) getVolume() / 7;
                int streamID = spool.play(hit, 1, 1, 0, 0, (float) 1.4);
                spool.setVolume(streamID, volumeNum, volumeNum);
            }
        });
    }

    // 获得当前系统音量 0~7
    private int getVolume() {
        int volume = -1;

        audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
        volume = audioManager.getStreamVolume(AudioManager.STREAM_RING);
        Log.i("STREAM_RING", "" + volume);

        return volume;
    }
}