该Demo执行后,会显示全部你sd卡上的音乐文件列表, 并能够点击列表选择某一首歌曲进行播放。
执行效果:
点击download出现:
然后点击歌曲调用系统播放器播放。
源码:
activity_audio_browser.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ListView
android:id="@android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</RelativeLayout>
AudioBrowser.java:
package com.multimediademo5customaudioplayer2;
import java.io.File;
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.view.View;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
/**
* 该Demo执行后,会显示全部你sd卡上的音乐文件列表。 并能够点击列表选择某一首歌曲进行播放。
*
*/
public class AudioBrowser extends ListActivity {
private Cursor cursor;
public static int STATE_SELECT_ALBUM = 0;
public static int STATE_SELECT_SONG = 1;
private int currentState = STATE_SELECT_ALBUM;
@SuppressWarnings("deprecation")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_audio_browser);
/**
* 创建一个字符串数组,表示当执行查询时将从MediaStore返回的列。
*/
String[] columns = { android.provider.MediaStore.Audio.Albums._ID,
android.provider.MediaStore.Audio.Albums.ALBUM };
/**
* 返回一个全部可用唱片集的列表
*/
cursor = managedQuery(MediaStore.Audio.Albums.EXTERNAL_CONTENT_URI,
columns, null, null, null);
String[] displayFields = new String[] { MediaStore.Audio.Albums.ALBUM };
int[] displayViews = new int[] { android.R.id.text1 };
/**
* 能够使用setListAdapter方法将Cursor对象绑定到ListView对象
*/
setListAdapter(new SimpleCursorAdapter(this,
android.R.layout.simple_list_item_1, cursor, displayFields,
displayViews));
}
@SuppressWarnings("deprecation")
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
/**
* 推断点击的是歌曲目录还是单个歌曲
*/
if (currentState == STATE_SELECT_ALBUM) {
/**
* 假设是歌曲目录。则进入该目录的歌曲列表
*/
if (cursor.moveToPosition(position)) {
String[] columns = { MediaStore.Audio.Media.DATA,
MediaStore.Audio.Media._ID,
MediaStore.Audio.Media.TITLE,
MediaStore.Audio.Media.DISPLAY_NAME,
MediaStore.Audio.Media.MIME_TYPE };
String where = android.provider.MediaStore.Audio.Media.ALBUM
+ "=?";
String whereVal[] = { cursor.getString(cursor
.getColumnIndex(MediaStore.Audio.Albums.ALBUM)) };
String orderBy = android.provider.MediaStore.Audio.Media.TITLE;
cursor = managedQuery(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, columns,
where, whereVal, orderBy);
String[] displayFields = new String[] { MediaStore.Audio.Media.DISPLAY_NAME };
int[] displayViews = new int[] { android.R.id.text1 };
setListAdapter(new SimpleCursorAdapter(this,
android.R.layout.simple_list_item_1, cursor,
displayFields, displayViews));
currentState = STATE_SELECT_SONG;
}
} else if (currentState == STATE_SELECT_SONG) {
/**
* 假设点击的是歌曲,则调用系统的播放器进行歌曲播放
*/
if (cursor.moveToPosition(position)) {
int fileColumn = cursor
.getColumnIndex(MediaStore.Audio.Media.DATA);
int mimeTypeColumn = cursor
.getColumnIndex(MediaStore.Audio.Media.MIME_TYPE);
String audioFilePath = cursor.getString(fileColumn);
String mimeType = cursor.getString(mimeTypeColumn);
Intent intent = new Intent(android.content.Intent.ACTION_VIEW);
File newFile = new File(audioFilePath);
intent.setDataAndType(Uri.fromFile(newFile), mimeType);
startActivity(intent);
}
}
}
}
源码下载: