音乐图片视频查询

MediaStore中定义了一系列的数据表格，通过ContentResolver提供的查询接口，我们可以得到各种需要的媒体信息。通过以下两个URI可以扫描设备外部和内部的媒体文件 。Android系统提供了MediaProvider，MediaStore， MediaScanner 接口，通过Content Provider的方式提供给用户。以下是一个简单的例子：（注意，项目使用AndroidAnnotation框架）

package com.example.testaa;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.androidannotations.annotations.AfterViews;
import org.androidannotations.annotations.Click;
import org.androidannotations.annotations.EActivity;
import org.androidannotations.annotations.ViewById;

import android.app.Activity;
import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;
import android.widget.Button;
import android.widget.TextView;
/*
 *@author: ZhengHaibo  
 *web:     http://blog.csdn.net/nuptboyzhb
 *mail:    [e-mail]
 *2014-4-15  Nanjing,njupt,China
 */
@EActivity(R.layout.activity_main)
public class MainActivity extends Activity {

  @ViewById
  Button getImage;

  @ViewById
  Button getVideo;

  @ViewById
  Button getAudio;

  @ViewById
  TextView myTextView;

  /**
  * 加载完View之后进行的处理
  */
  @AfterViews
  void afterViewProcess() {

  }

  /**
  * 获取图像列表
  */
  @Click
  void getImage() {
    String[] projection = { MediaStore.Images.Media._ID,
        MediaStore.Images.Media.DISPLAY_NAME,
        MediaStore.Images.Media.DATA };
    String orderBy = MediaStore.Images.Media.DISPLAY_NAME;
    Uri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;
    getContentProvider(uri,projection, orderBy);
  }

  /**
  * 获取视频列表
  */
  @Click
  void getVideo() {
    // TODO Auto-generated method stub
     String []projection = { MediaStore.Video.Media._ID,  
                 MediaStore.Video.Media.DISPLAY_NAME,  
                 MediaStore.Video.Media.DATA}; 
    String orderBy = MediaStore.Video.Media.DISPLAY_NAME;
    Uri uri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
    getContentProvider(uri,projection, orderBy);
  }

  /**
  * 获取音频列表
  */
  @Click
  void getAudio() {
    String []projection = { MediaStore.Audio.Media._ID,  
                MediaStore.Audio.Media.DISPLAY_NAME,  
                MediaStore.Audio.Media.DATA,  
                MediaStore.Audio.Media.SIZE}; 
    String orderBy = MediaStore.Audio.Media.DISPLAY_NAME;
    Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    getContentProvider(uri,projection, orderBy);
  }
  
  /**
  * 获取ContentProvider
  * @param projection
  * @param orderBy
  */
  public void getContentProvider(Uri uri,String[] projection, String orderBy) {
    // TODO Auto-generated method stub
    List<HashMap<String, String>> listImage = new ArrayList<HashMap<String, String>>();
    Cursor cursor = getContentResolver().query(uri, projection, null,
        null, orderBy);
    if (null == cursor) {
      return;
    }
    while (cursor.moveToNext()) {
      HashMap<String, String> map = new HashMap<String, String>();
      for(int i=0;i<projection.length;i++){
        map.put(projection[i], cursor.getString(i));
        System.out.println(projection[i]+":"+cursor.getString(i));
      }
      listImage.add(map);
    }
    myTextView.setText(listImage.toString());
  }

}
唯一的参数改变是mediastore后面那个包名的不同，分别是images,video,audio，这些包后面的包名都是media