Android应用--简、美音乐播放器增加音量控制，Android程序员必会
}
public void setDuration(long duration) {
this.duration = duration;
}
public
《Android学习笔记总结+最新移动架构视频+大厂安卓面试真题+项目实战源码讲义》
【docs.qq.com/doc/DSkNLaERkbnFoS0ZF】 完整内容开源分享
long getSize() {
return size;
}
public void setSize(long size) {
this.size = size;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getLrcTitle() {
return lrcTitle;
}
public void setLrcTitle(String lrcTitle) {
this.lrcTitle = lrcTitle;
}
public String getLrcSize() {
return lrcSize;
}
public void setLrcSize(String lrcSize) {
this.lrcSize = lrcSize;
}
}
这篇博客要增加的功能是控制音量，其实已经非常简单了，不过这里用到了动画还是可以用来讲讲的。
运行效果截图：
点击左下角的那个音频按钮就可以显示出控制音量的面板，滑动拖动条就可以控制音量了。
控制音量面板的布局代码：
android:id="@+id/ll_player_voice"
android:layout_width=“fill_parent”
android:layout_height=“wrap_content”
android:layout_below="@id/header_layout"
android:background="@drawable/player_progresslayout_bg"
android:visibility=“gone” >
android:id="@+id/iv_player_min_voice"
android:layout_width=“wrap_content”
android:layout_height=“wrap_content”
android:layout_alignParentLeft=“true”
android:layout_centerVertical=“true”
android:background="@drawable/volume_min_icon" />
android:id="@+id/iv_player_max_voice"
android:layout_width=“wrap_content”
android:layout_height=“wrap_content”
android:layout_alignParentRight=“true”
android:layout_centerVertical=“true”
android:background="@drawable/volume_max_icon" />
android:id="@+id/sb_player_voice"
android:layout_width=“fill_parent”
android:layout_height=“wrap_content”
android:layout_centerVertical=“true”
android:layout_toLeftOf="@id/iv_player_max_voice"
android:layout_toRightOf="@id/iv_player_min_voice"
android:background="@drawable/voice_seekbar_bg"
android:paddingLeft=“5dp”
android:paddingRight=“5dp”
android:progressDrawable="@drawable/voice_seekbar_progress"
android:thumb="@drawable/voice_seekbar_thumb" />
/drawable/voice_seekbar_progress.xml
这个用来显示进度条，用到了图层资源
android:drawable="@drawable/voice_seekbar_bg">
/drawable、voice_seekbar_thumb.xml
拖动条滑块的选择器
写到这里，我想到了可能令开发者头痛的应该是没有合适的素材，其实这些素材并不一定要自己去做，况且也不一定能做到美观，也没那么多时间。所以我们可以就地取材，这时候反编译的技术就有用了，下载一些你认为你需要用到的素材的应用的APK文件，进行反编译，就可以得到大量的素材。把这些素材用到你的应用就行啦。反正小巫一直都是这么做的，小巫没办法自己去做。
接着：定义相应的变量
private AudioManager am; //音频管理引用，提供对音频的控制
RelativeLayout ll_player_voice; //音量控制面板布局
int currentVolume; //当前音量
int maxVolume; //最大音量
ImageButton ibtn_player_voice; //显示音量控制面板的按钮
SeekBar sb_player_voice; //控制音量大小
// 音量面板显示和隐藏动画
private Animation showVoicePanelAnimation;
private Animation hiddenVoicePanelAnimation;
获取对象
showVoicePanelAnimation = AnimationUtils.loadAnimation(PlayerActivity.this, R.anim.push_up_in);
hiddenVoicePanelAnimation = AnimationUtils.loadAnimation(PlayerActivity.this, R.anim.push_up_out);
//获得系统音频管理服务对象
am = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
currentVolume = am.getStreamVolume(AudioManager.STREAM_MUSIC);
maxVolume = am.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
sb_player_voice.setMax(maxVolume);
动画文件
puch_up_in.xml
push_up_out.xml
找到控件
ibtn_player_voice = (ImageButton) findViewById(R.id.ibtn_player_voice);
ll_player_voice = (RelativeLayout) findViewById(R.id.ll_player_voice);
sb_player_voice = (SeekBar) findViewById(R.id.sb_player_voice);
设置监听器
ibtn_player_voice.setOnClickListener(ViewOnClickListener);
sb_player_voice.setOnSeekBarChangeListener(new SeekBarChangeListener());
ibtn_player_voice用来控制动画显示面板
case R.id.ibtn_player_voice: //控制音量
voicePanelAnimation();
break;
//控制显示音量控制面板的动画
public void voicePanelAnimation() {
if(ll_player_voice.getVisibility() == View.GONE) {
ll_player_voice.startAnimation(showVoicePanelAnimation);
ll_player_voice.setVisibility(View.VISIBLE);
}
else{
ll_player_voice.startAnimation(hiddenVoicePanelAnimation);
ll_player_voice.setVisibility(View.GONE);
}
}
sb_player_voice用来控制音量大小
/**
-
实现监听Seekbar的类
-
@author wwj
*/
private class SeekBarChangeListener implements OnSeekBarChangeListener {
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
switch(seekBar.getId()) {
case R.id.audioTrack:
if (fromUser) {
audioTrackChange(progress); // 用户控制进度的改变
}
break;
case R.id.sb_player_voice:
// 设置音量
am.setStreamVolume(AudioManager.STREAM_MUSIC, progress, 0);
break;
}