Android应用--简、美音乐播放器增加音量控制，Android程序员必会
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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; }