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下面将和大家一起介绍一个音乐播放器项目,完成后的播放器具有暂停,下一首,前一首,歌曲列表,播放条进度等一些基本功能,它只是播放SDCARD上的.map文件,
Android SDK为我们提供了一个MeidaPlayer类,有了这个类我们可以很方便的创建一个mdeiaplayer服务,该类中具有一些方法:
MediaPlayer mp = new MediaPlayer();
// 设置文件存储路径
setDataSource("/sdcard/path_to_song");
// 播放
mp.start();
// 暂短
mp.pause();
// 复位
mp.reset();
// 获取当前播放时长
mp.getDuration();
// 进度条
mp.getCurrentDuration();
// Move song to particular second - used for Forward or Backward
mp.seekTo(positon); // position in milliseconds
// 检测歌曲是否正在播放
mp.isPlaying(); // returns true or false
1:音乐播放器的界面:
播放器界面中所用的一些布局图片,这些图片大家可以到android SDK文件夹下或是到网络中去寻找一些类似就可以,并不一定要这些图片,代码才是我们的关键,
3:然后我们需要写一个XML布局文件用于播放器的播按钮在不同状态下的图片,此XML文件保存在drawable文件夹下,
btn_play.xml
<selector xmlns:android="
<item android:drawable="@drawable/img_btn_play_pressed"
android:state_focused="true"
android:state_pressed="true" />
<item android:drawable="@drawable/img_btn_play_pressed"
android:state_focused="false"
android:state_pressed="true" />
<item android:drawable="@drawable/img_btn_play_pressed"
android:state_focused="true" />
<item android:drawable="@drawable/img_btn_play"
android:state_focused="false"
android:state_pressed="false" />
</selector>
提示:大家可以根据此XML文件完成其它的一些按钮布局文件,d 在这里就没有再为大家一一提供了,
4:
为了让播放器更绚,我们可以自定义一个SeekBar作为歌曲的播放进度,自定义风格代如下:
(4.1)更换背景图片:
seekbar_progress_bg.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="
<item>
<clip>
<bitmap xmlns:android="
android:src="@drawable/img_seekbar_progress_blue"
android:tileMode="repeat"
android:antialias="true"
android:dither="false"
android:filter="false"
android:gravity="left"
/>
</clip>
</item>
(4.2)Changing SeekBar Progress:
seekbar_progress.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="
<item android:id="@android:id/background"
android:drawable="@drawable/img_seekbar_bg"
android:dither="true">
</item>
<item android:id="@android:id/secondaryProgress">
<clip>
<shape>
<gradient
android:startColor="#80028ac8"
android:centerColor="#80127fb1"
android:centerY="0.75"
android:endColor="#a004638f"
android:angle="270"
/>
</shape>
</clip>
</item>
<item
android:id="@android:id/progress"
android:drawable="@drawable/seekbar_progress_bg"
/>
</layer-list>
(4.3)实际的Seekbar控件定义如下 :
<SeekBar
android:id="@+id/songProgressBar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginRight="20dp"
android:layout_marginLeft="20dp"
android:layout_marginBottom="20dp"
android:layout_above="@id/player_footer_bg"
android:thumb="@drawable/seek_handler"
android:progressDrawable="@drawable/seekbar_progress"
android:paddingLeft="6dp"
android:paddingRight="6dp"/>
5:
接下来我们将实现播放的整体界面的布局文件:player.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/player_background">
<!-- Player Header -->
<LinearLayout
android:id="@+id/player_header_bg"
android:layout_width="fill_parent"
android:layout_height="60dip"
android:background="@layout/bg_player_header"
android:layout_alignParentTop="true"
android:paddingLeft="5dp"
android:paddingRight="5dp">
<!-- Song Title -->
<TextView
android:id="@+id/songTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:textColor="#04b3d2"
android:textSize="16dp"
android:paddingLeft="10dp"
android:textStyle="bold"
android:text="The Good, The Bad And The Ugly"
android:layout_marginTop="10dp"/>
<!-- Playlist button -->
<ImageButton
android:id="@+id/btnPlaylist"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:src="@drawable/btn_playlist"
android:background="@null"/>
</LinearLayout>
<!-- Song Thumbnail Image -->
<LinearLayout
android:id="@+id/songThumbnail"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:paddingTop="10dp"
android:paddingBottom="10dp"
android:gravity="center"
android:layout_below="@id/player_header_bg">
<ImageView android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/adele"/>
</LinearLayout>
<!-- Player Footer -->
<LinearLayout
android:id="@+id/player_footer_bg"
android:layout_width="fill_parent"
android:layout_height="100dp"
android:layout_alignParentBottom="true"
android:background="@layout/bg_player_footer"
android:gravity="center">
<!-- Player Buttons -->
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center_vertical"
android:background="@layout/rounded_corner"
android:paddingLeft="10dp"
android:paddingRight="10dp">
<!-- Previous Button -->
<ImageButton
android:id="@+id/btnPrevious"
android:src="@drawable/btn_previous"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@null"/>
<!-- Backward Button -->
<ImageButton
android:id="@+id/btnBackward"
android:src="@drawable/btn_backward"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@null"/>
<!-- Play Button -->
<ImageButton
android:id="@+id/btnPlay"
android:src="@drawable/btn_play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@null"/>
<!-- Forward Button -->
<ImageButton
android:id="@+id/btnForward"
android:src="@drawable/btn_forward"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@null"/>
<!-- Next Button -->
<ImageButton
android:id="@+id/btnNext"
android:src="@drawable/btn_next"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@null"/>
</LinearLayout>
</LinearLayout>
<!-- Progress Bar/Seek bar -->
<SeekBar
android:id="@+id/songProgressBar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginRight="20dp"
android:layout_marginLeft="20dp"
android:layout_marginBottom="20dp"
android:layout_above="@id/player_footer_bg"
android:thumb="@drawable/seek_handler"
android:progressDrawable="@drawable/seekbar_progress"
android:paddingLeft="6dp"
android:paddingRight="6dp"/>
<!-- Timer Display -->
<LinearLayout
android:id="@+id/timerDisplay"
android:layout_above="@id/songProgressBar"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginRight="20dp"
android:layout_marginLeft="20dp"
android:layout_marginBottom="10dp">
<!-- Current Duration Label -->
<TextView
android:id="@+id/songCurrentDurationLabel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="left"
android:textColor="#eeeeee"
android:textStyle="bold"/>
<!-- Total Duration Label -->
<TextView
android:id="@+id/songTotalDurationLabel"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="1"
android:gravity="right"
android:textColor="#04cbde"
android:textStyle="bold"/>
</LinearLayout>
<!-- Repeat / Shuffle buttons -->
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="@id/timerDisplay"
android:gravity="center">
<!-- Repeat Button -->
<ImageButton
android:id="@+id/btnRepeat"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/btn_repeat"
android:layout_marginRight="5dp"
android:background="@null"/>
<!-- Shuffle Button -->
<ImageButton
android:id="@+id/btnShuffle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/btn_shuffle"
android:layout_marginLeft="5dp"
android:background="@null"/>
</LinearLayout>
</RelativeLayout>
6:
有了播放器的播放界面后,我们再将所有歌曲显示的界面实现了,播放器的歌曲列表用的一个listview控件,同样我们也为该listview控件自定义,适合播放的整体界面风格,
list_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="
<!-- Selector style for listrow -->
<item
android:state_selected="false"
android:state_pressed="false"
android:drawable="@drawable/gradient_bg" />
<item android:state_pressed="true"
android:drawable="@drawable/gradient_bg_hover" />
<item android:state_selected="true"
android:state_pressed="false"
android:drawable="@drawable/gradient_bg_hover" />
</selector>
歌曲列表界面布局文件:
playlist.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ListView
android:id="@android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:divider="#242424"
android:dividerHeight="1dp"
android:listSelector="@drawable/list_selector" />
</LinearLayout>
listviewr的item界面布局,用于定义单个歌曲的显示界面:
playlist_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center"
android:background="@drawable/list_selector"
android:padding="5dp">
<TextView
android:id="@+id/songTitle"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="16dp"
android:padding="10dp"
android:color="#f3f3f3"/>
</LinearLayout>
歌曲列表界面图:
7:
到此为止我们在上面已经完成了该项目的所有布局文件,下面我们就来实现SongManager.java类,这个类用于扫描设备中所有.mp3文件,
SongsManager.mp3
public class SongsManager {
// SDCard Path
final String MEDIA_PATH = new String("/sdcard/");
private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
// Constructor
public SongsManager(){
}
/**
* Function to read all mp3 files from sdcard
* and store the details in ArrayList
* */
public ArrayList<HashMap<String, String>> getPlayList(){
File home = new File(MEDIA_PATH);
if (home.listFiles(new FileExtensionFilter()).length > 0) {
for (File file : home.listFiles(new FileExtensionFilter())) {
HashMap<String, String> song = new HashMap<String, String>();
song.put("songTitle", file.getName().substring(0, (file.getName().length() - 4)));
song.put("songPath", file.getPath());
// Adding each song to SongList
songsList.add(song);
}
}
// return songs list array
return songsList;
}
/**
* Class to filter files which are having .mp3 extension
* */
class FileExtensionFilter implements FilenameFilter {
public boolean accept(File dir, String name) {
return (name.endsWith(".mp3") || name.endsWith(".MP3"));
}
}
}
8:创建一个新的Activity 类,该类用于显示在ongsManager.java中扫描到的所有歌曲,
PlayListActivity.java
package com.androidhive.musicplayer;
import java.util.ArrayList;
import java.util.HashMap;
import android.app.ListActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
public class PlayListActivity extends ListActivity {
// Songs list
public ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.playlist);
ArrayList<HashMap<String, String>> songsListData = new ArrayList<HashMap<String, String>>();
SongsManager plm = new SongsManager();
// get all songs from sdcard
this.songsList = plm.getPlayList();
// looping through playlist
for (int i = 0; i < songsList.size();
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