Android--通过ContentResolver取得com.android.providers.media下的media信息

java文件：

package cn.mrzhu.media;import android.app.Activity;import android.content.ContentResolver;import android.content.Intent;import android.database.Cursor;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.provider.MediaStore;import android.util.Log;import android.view.View;/** * 通过ContentResolver取得com.android.providers.media下的media信息 * @author ZLQ * */public class TestMedia extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.media);}/** * show按钮，点击按钮打印输出文件的标题，演唱者和专辑 * @param v */public void show(View v) {//指定到com.android.providers.media下的external_XXXdb，即存储卡数据库Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;//audio_meta表的里_id，即文件的idString _ID = MediaStore.Audio.Media._ID;//audio_meta表的里title,即文件的标题String TITLE = MediaStore.Audio.Media.TITLE;//artist表的里artist_id,即演唱者的idString ARTIST_ID = MediaStore.Audio.Media.ARTIST_ID;//artist表的里artist_id,即演唱者的信息String ARTIST = MediaStore.Audio.Media.ARTIST;//album表的里album_id,即专辑的idString ALBUM_ID = MediaStore.Audio.Media.ALBUM_ID;//album表的里album_id,即专辑的信息String ALBUM = MediaStore.Audio.Media.ALBUM;//取得内容解析对象ContentResolver cr = getContentResolver();//调用query开始解析数据，返回一个Cursor结果集Cursor cs = cr.query(uri, null, null, null, null);while (cs.moveToNext()) {//取得audio_meta表的里_idString meta_id = cs.getString(cs.getColumnIndex(_ID));//取得audio_meta表的里titleString title = cs.getString(cs.getColumnIndex(TITLE));//用条件ARTIST_ID + "=" + meta_id + " and " + ALBUM_ID + "=" + meta_id//从artist表和album表中找到与audio_meta表_id相对应的信息Cursor c = cr.query(uri, null, ARTIST_ID + "=" + meta_id + " and " + ALBUM_ID + "=" + meta_id, null, null);while(c.moveToNext()){//打印输出文件的标题，演唱者和专辑Log.i("System.out","title    " + title + "   artist  " + c.getString(c.getColumnIndex(ARTIST))+ "   album   " + c.getString(c.getColumnIndex(ALBUM)));}}}/** * scan按钮，点击按钮给系统发送广播，搜索sdcard卡下的所有音乐文件并更新数据库 * @param v */public void scan(View v) {Intent intent = new Intent(Intent.ACTION_MEDIA_MOUNTED,Uri.parse("file://"+ Environment.getExternalStorageDirectory().getAbsolutePath()));sendBroadcast(intent);}}

 

media.xml文件：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent" >    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="scan"        android:text="scan" >    </Button>    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:onClick="show"        android:text="show" >    </Button></LinearLayout>