本文章主要介绍了Android之音量调节，具有不错的的参考价值，希望对您有所帮助，如解说有误或未考虑完全的地方，请您留言指出，谢谢！
main.xml布局文件
<? xml version = " 1.0 " encoding = " utf-8 " ?>
< LinearLayout xmlns:android = " http://schemas.android.com/apk/res/android "
android:orientation = " vertical " android:layout_width = " fill_parent "
android:layout_height = " fill_parent " >
< Button android:id = " @+id/btnPlay "
android:layout_width = " fill_parent "
android:layout_height = " wrap_content "
android:text = " 播放音乐 " />
< LinearLayout android:orientation = " horizontal "
android:layout_width = " wrap_content "
android:layout_height = " wrap_content "
android:layout_gravity = " center_horizontal " >
< ToggleButton android:id = " @+id/tbMute "
android:layout_width = " fill_parent "
android:layout_height = " wrap_content "
android:textOn = " 静音 "
android:textOff = " 正常 "
android:checked = " true "
android:layout_gravity = " center_vertical " />
< Button android:id = " @+id/btnUpper "
android:text = " 增大音量 "
android:layout_width = " wrap_content "
android:layout_height = " wrap_content " />
< Button android:id = " @+id/btnLower "
android:text = " 减小音量 "
android:layout_width = " wrap_content "
android:layout_height = " wrap_content " />
</ LinearLayout >
</ LinearLayout >
AudioActivity类
package com.ljq.activity;
import android.app.Activity;
import android.app.Service;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.ToggleButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
public class AudioActivity extends Activity {
private Button btnPlay = null , btnUpper = null , btnLower = null ;
private ToggleButton tbMute = null ;
private MediaPlayer mediaPlayer = null ; // 声频
private AudioManager audioManager = null ; // 音频
@Override
public void onCreate(Bundle savedInstanceState) {
super .onCreate(savedInstanceState);
setContentView(R.layout.main);
audioManager = (AudioManager)getSystemService(Service.AUDIO_SERVICE);
btnPlay = (Button)findViewById(R.id.btnPlay);
btnUpper = (Button)findViewById(R.id.btnUpper);
btnLower = (Button)findViewById(R.id.btnLower);
btnPlay.setOnClickListener(listener);
btnUpper.setOnClickListener(listener);
btnLower.setOnClickListener(listener);
tbMute = (ToggleButton)findViewById(R.id.tbMute);
tbMute.setOnCheckedChangeListener( new OnCheckedChangeListener(){
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
audioManager.setStreamMute(AudioManager.STREAM_MUSIC, ! isChecked); // 设置是否静音
}
});
}
View.OnClickListener listener = new View.OnClickListener(){
public void onClick(View v) {
@SuppressWarnings( " unused " )
Button btn = (Button)v;
switch (v.getId()) {
case R.id.btnPlay: // 播放音乐
mediaPlayer = MediaPlayer.create(AudioActivity. this , R.raw.music);
mediaPlayer.setLooping( true ); // 设置循环播放
mediaPlayer.start(); // 播放声音
break ;
case R.id.btnUpper: // 增多音量
// adjustStreamVolume: 调整指定声音类型的音量
audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_RAISE,
AudioManager.FLAG_SHOW_UI); // 调高声音
break ;
case R.id.btnLower: // 减少音量
// 第一个参数：声音类型
// 第二个参数：调整音量的方向
// 第三个参数：可选的标志位
audioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_LOWER,
AudioManager.FLAG_SHOW_UI); // 调低声音
break ;
}
}
};
}
运行结果
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