Android MediaPlayer 简单综合应用------列出sdcard里所有.mp3文件,并且可以点击播放!...

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大家好,我们今天要利用AndroidMediaPlayer

Step 1:preparation work.

mksdcard 512M sdcard.img

create a new avd named AndroidSdcard

push songs into sdcard(before you push,you make sure your avd is running,else the operation of push will not work):

adb push f:\music\1.mp3 /sdcard

Step 2: Layout UI desigen:

create two .xml files we called song_item.xml and songlist.xml the code are:

song_item.xml:

<?xml version="1.0" encoding="utf-8"?>
<TextView android:id="@+id/text1" xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

songlist.xml:

<?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">

Step 3: the core code MeusicDemo.java:

package com.android.test;

import java.io.File;
import java.io.FilenameFilter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import android.app.ListActivity;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

class Mp3Filter implements FilenameFilter {
public boolean accept(File dir, String name) {
return (name.endsWith(".mp3"));
}
}

public class MeusicDemo extends ListActivity {

private static final String MEDIA_PATH = new String("/sdcard/");
private List<String> songs = new ArrayList<String>();
private MediaPlayer mp = new MediaPlayer();

@Override
public void onCreate(Bundle icicle) {
try {
super.onCreate(icicle);
setContentView(R.layout.songlist);
updateSongList();
} catch (NullPointerException e) {
Log.v(getString(R.string.app_name), e.getMessage());
}
}

public void updateSongList() {
File home = new File(MEDIA_PATH);
if (home.listFiles( new Mp3Filter()).length > 0) {
for (File file : home.listFiles( new Mp3Filter())) {
songs.add(file.getName());
}

ArrayAdapter<String> songList = new ArrayAdapter<String>(this,R.layout.song_item,songs);
setListAdapter(songList);
}
}

@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
try {

mp.reset();
mp.setDataSource(MEDIA_PATH + songs.get(position));
mp.prepare();
mp.start();
} catch(IOException e) {
Log.v(getString(R.string.app_name), e.getMessage());
}
}
}