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Android應用--簡、美音樂播放器增加音量控制

編輯：關於Android編程

Android應用--簡、美音樂播放器增加音量控制
2013年6月26日簡、美音樂播放器繼續完善中、、

題外話：上一篇博客是在6月11號發的，那篇博客似乎有點問題，可能是因為代碼結構有點亂的原因，很難把握整體。整個應用的開發，周期太長了，有時候因為一些雜事未能抽出時間來繼續開發，有時候又沒有心情去做，所以一直拖。如果真正的開發讓我拖那麼久的話，早就成了死亡之旅項目了。作為一定獨立開發者我是不合格的，還沒有一個成熟的作品出來，一直想能做出個拿得出手的應用放上應用商店讓所有人都能用到，但有心而力不從。不知道做什麼是一個原因，個人水平也有限，雜事繁多時間安排不當。各種借口。不過，小巫會做一個獨特的應用作為自己的畢業設計的，至於怎麼獨特還沒有特別的思路。可能到時也會把自己的畢業設計作品整理成博客，讓學習Android的朋友們參考參考。感謝網友們的一直支持。

有網友說要看Mp3Info類，在這裡也就貼出來
[java]
package com.wwj.sb.domain;

/**
* 2013/5/7 mp3實體類
*
* @author wwj
*
*/
public class Mp3Info{
    private long id; // 歌曲ID
    private String title; // 歌曲名稱
    private String album; // 專輯
    private String artist; // 歌手名稱
    private long duration; // 歌曲時長
    private long size; // 歌曲大小
    private String url; // 歌曲路徑
    private String lrcTitle; // 歌詞名稱
    private String lrcSize; // 歌詞大小

    public Mp3Info() {
        super();
    }

    /**
     *
     * @param id
     * @param title
     * @param album
     * @param artist
     * @param duration
     * @param size
     * @param lrcTitle
     * @param lrcSize
     * @param url
     */
    public Mp3Info(int id, String title, String album, String artist,
            int duration, int size, String lrcTitle, String lrcSize,
            String url) {
        super();
        this.id = id;
        this.title = title;
        this.album = album;
        this.artist = artist;
        this.duration = duration;
        this.size = size;
        this.lrcTitle = lrcTitle;
        this.lrcSize = lrcSize;
        this.url = url;
    }

    @Override
    public String toString() {
        return "Mp3Info [id=" + id + ", title=" + title + ", album=" + album
                + ", artist=" + artist + ", duration=" + duration + ", size="
                + size + ", url=" + url + ", lrcTitle=" + lrcTitle
                + ", lrcSize=" + lrcSize + "]";
    }

    public long getId() {
        return id;
    }

    public void setId(long id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getAlbum() {
        return album;
    }

    public void setAlbum(String album) {
        this.album = album;
    }

    public String getArtist() {
        return artist;
    }

    public void setArtist(String artist) {
        this.artist = artist;
    }

    public long getDuration() {
        return duration;
    }

    public void setDuration(long duration) {
        this.duration = duration;
    }

    public 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;
    }

}

package com.wwj.sb.domain;

/**
* 2013/5/7 mp3實體類
*
* @author wwj
*
*/
public class Mp3Info{
private long id; // 歌曲ID
private String title; // 歌曲名稱
private String album; // 專輯
private String artist; // 歌手名稱
private long duration; // 歌曲時長
private long size; // 歌曲大小
private String url; // 歌曲路徑
private String lrcTitle; // 歌詞名稱
private String lrcSize; // 歌詞大小

public Mp3Info() {
super();
}

/**
*
* @param id
* @param title
* @param album
* @param artist
* @param duration
* @param size
* @param lrcTitle
* @param lrcSize
* @param url
*/
public Mp3Info(int id, String title, String album, String artist,
   int duration, int size, String lrcTitle, String lrcSize,
   String url) {
  super();
  this.id = id;
  this.title = title;
  this.album = album;
  this.artist = artist;
  this.duration = duration;
  this.size = size;
  this.lrcTitle = lrcTitle;
  this.lrcSize = lrcSize;
  this.url = url;
}

@Override
public String toString() {
  return "Mp3Info [id=" + id + ", title=" + title + ", album=" + album
    + ", artist=" + artist + ", duration=" + duration + ", size="
    + size + ", url=" + url + ", lrcTitle=" + lrcTitle
    + ", lrcSize=" + lrcSize + "]";
}

public long getId() {
return id;
}

public void setId(long id) {
this.id = id;
}

public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

public String getAlbum() {
return album;
}

public void setAlbum(String album) {
this.album = album;
}

public String getArtist() {
return artist;
}

public void setArtist(String artist) {
this.artist = artist;
}

public long getDuration() {
return duration;
}

public void setDuration(long duration) {
this.duration = duration;
}

public 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;
}

}

這篇博客要增加的功能是控制音量，其實已經非常簡單了，不過這裡用到了動畫還是可以用來講講的。

運行效果截圖：

點擊左下角的那個音頻按鈕就可以顯示出控制音量的面板，滑動拖動條就可以控制音量了。

控制音量面板的布局代碼：
[html]
<RelativeLayout
            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" >

            <ImageView
                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" />

            <ImageView
                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" />

            <SeekBar
                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" />
        </RelativeLayout>

/drawable/voice_seekbar_progress.xml
這個用來顯示進度條，用到了圖層資源
[html]
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@android:id/background"
         android:drawable="@drawable/voice_seekbar_bg">
   </item>
    <item android:id="@android:id/progress">
        <clip android:drawable="@drawable/voice_seekbar_one" />
    </item>
</layer-list>

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
  <item android:id="@android:id/background"
    android:drawable="@drawable/voice_seekbar_bg">
   </item>
    <item android:id="@android:id/progress">
        <clip android:drawable="@drawable/voice_seekbar_one" />
    </item>
</layer-list>
/drawable、voice_seekbar_thumb.xml
拖動條滑塊的選擇器
[html]
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@drawable/voice_thumb_press" />
    <item android:drawable="@drawable/voice_thumb_normal" />
</selector>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="@drawable/voice_thumb_press" />
<item android:drawable="@drawable/voice_thumb_normal" />
</selector>

寫到這裡，我想到了可能令開發者頭痛的應該是沒有合適的素材，其實這些素材並不一定要自己去做，況且也不一定能做到美觀，也沒那麼多時間。所以我們可以就地取材，這時候反編譯的技術就有用了，下載一些你認為你需要用到的素材的應用的APK文件，進行反編譯，就可以得到大量的素材。把這些素材用到你的應用就行啦。反正小巫一直都是這麼做的，小巫沒辦法自己去做。

接著：定義相應的變量
[java]
private AudioManager am;        //音頻管理引用，提供對音頻的控制
RelativeLayout ll_player_voice; //音量控制面板布局
int currentVolume;              //當前音量
int maxVolume;                  //最大音量
ImageButton ibtn_player_voice; //顯示音量控制面板的按鈕
SeekBar sb_player_voice;        //控制音量大小
// 音量面板顯示和隱藏動畫
private Animation showVoicePanelAnimation;
private Animation hiddenVoicePanelAnimation;

private AudioManager am;  //音頻管理引用，提供對音頻的控制
RelativeLayout ll_player_voice; //音量控制面板布局
int currentVolume;    //當前音量
int maxVolume;     //最大音量
ImageButton ibtn_player_voice; //顯示音量控制面板的按鈕
SeekBar sb_player_voice;  //控制音量大小
// 音量面板顯示和隱藏動畫
private Animation showVoicePanelAnimation;
private Animation hiddenVoicePanelAnimation;

獲取對象
[java]
showVoicePanelAnimation = AnimationUtils.loadAnimation(PlayerActivity.this, R.anim.push_up_in);
hiddenVoicePanelAnimation = AnimationUtils.loadAnimation(PlayerActivity.this, R.anim.push_up_out);

//獲得系統音頻管理服務對象
am = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
currentVolume = am.getStreamVolume(AudioManager.STREAM_MUSIC);
maxVolume = am.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
sb_player_voice.setMax(maxVolume);

  showVoicePanelAnimation = AnimationUtils.loadAnimation(PlayerActivity.this, R.anim.push_up_in);
  hiddenVoicePanelAnimation = AnimationUtils.loadAnimation(PlayerActivity.this, R.anim.push_up_out);

  //獲得系統音頻管理服務對象
  am = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
  currentVolume = am.getStreamVolume(AudioManager.STREAM_MUSIC);
  maxVolume = am.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
  sb_player_voice.setMax(maxVolume);

動畫文件
puch_up_in.xml
[html]
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator">
<alpha android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="200"/>
<translate android:fromYDelta="-100%" android:toYDelta="0" android:duration="200"/>
</set>

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator">
    <alpha android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="200"/>
    <translate android:fromYDelta="-100%" android:toYDelta="0" android:duration="200"/>
</set>
push_up_out.xml
[html]
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/accelerate_interpolator">
    <alpha android:fromAlpha="1.0" android:toAlpha="0.0" android:duration="200"/>
    <translate android:fromYDelta="0" android:toYDelta="-100%" android:duration="200"/>
</set>

找到控件
[java]
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);

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);

設置監聽器
[java]
ibtn_player_voice.setOnClickListener(ViewOnClickListener);
sb_player_voice.setOnSeekBarChangeListener(new SeekBarChangeListener());

ibtn_player_voice.setOnClickListener(ViewOnClickListener);
sb_player_voice.setOnSeekBarChangeListener(new SeekBarChangeListener());

ibtn_player_voice用來控制動畫顯示面板
[java]
case R.id.ibtn_player_voice:    //控制音量
    voicePanelAnimation();
    break;

   case R.id.ibtn_player_voice: //控制音量
    voicePanelAnimation();
    break;

[java]
//控制顯示音量控制面板的動畫
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);
    }
}

//控制顯示音量控制面板的動畫
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用來控制音量大小
[java]
/**
* 實現監聽Seekbar的類
*
* @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); // 用戶控制進度的改變
            }
            break;
        case R.id.sb_player_voice:
            // 設置音量
            am.setStreamVolume(AudioManager.STREAM_MUSIC, progress, 0);
            break;
        }
    }

/**
* 實現監聽Seekbar的類
*
* @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); // 用戶控制進度的改變
    }
    break;
   case R.id.sb_player_voice:
    // 設置音量
    am.setStreamVolume(AudioManager.STREAM_MUSIC, progress, 0);
    break;
   }
  }

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