本文实例讲述了android实现音量调节的方法。分享给大家供大家参考。具体如下:
main.xml布局文件:
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<?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>
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audioactivity类:
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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 ;
}
}
};
}
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运行结果:
希望本文所述对大家的android程序设计有所帮助。