ava代码

<ListView 
  android:id="@id/android:list"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:drawSelectorOnTop="true"
        android:listSelector="@drawable/selector"
        android:divider="@drawable/list_line"/>

selector:如下

selector xmlns:android="http://schemas.android.com/apk/res/android"> 

<item 
android:drawable="@drawable/list_normal" 
android:state_selected="false" 
android:state_pressed="false" /> 

<item 
android:drawable="@drawable/list_pressed" 
android:state_selected="false" 
android:state_pressed="true" /> 

<item 
android:drawable="@drawable/list_pressed" 
android:state_selected="true" /> 

</selector>

android:divider="@drawable/list_line" 就是每项之间的横线

可以找个横线图片

/************************************************************************/

大家好,我们今天要利用Android  MediaPlayer

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">

    <ListView android:id="@id/android:list"
              android:layout_width="fill_parent" 
              android:layout_height="fill_parent"
              android:layout_weight="1"
              android:drawSelectorOnTop="false"/>

    <TextView android:id="@id/android:empty"
              android:layout_width="fill_parent" 
              android:layout_height="fill_parent"
              android:text="No songs found on SD Card."/>
</LinearLayout>

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());
  } 
 }
}

Step 4:run it.the result like this:

now u can enjoy  the music.lol~

if u wanna the source code please leave your email address, i will send u!