• Android音频文件浏览+音频播放


     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:

    点击下载源代码

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  • 原文地址:https://www.cnblogs.com/clnchanpin/p/6906001.html
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