通过ContentProvider得到系统的音频,视频等

package com.mct.scanallmediafilesdemo;

import android.app.Activity;
import android.content.ContentResolver;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.MediaStore;
import android.util.Log;

public class MainActivity extends Activity {

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// scanMusic();
scanImage();
}

private void scanVideo() {
// 遍历视频
ContentResolver contentResolver = getContentResolver();
String[] projection = new String[] {
MediaStore.Video.Media.MINI_THUMB_MAGIC,
MediaStore.Video.Media.DATA };
Cursor cursor = contentResolver.query(
MediaStore.Video.Media.EXTERNAL_CONTENT_URI, projection, null,
null, MediaStore.Video.Media.DEFAULT_SORT_ORDER);
// int fileNum = cursor.getCount();

while (cursor.moveToNext()) {
Log.e("MainActivity",
"file is: "
+ cursor.getString(cursor
.getColumnIndex(MediaStore.Video.Media.DATA)));
}
cursor.close();
}

private void scanMusic() {
Cursor cursor = getContentResolver().query(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,
MediaStore.Audio.Media.DEFAULT_SORT_ORDER);
cursor.moveToFirst();
// int counter = cursor.getCount();

while (cursor.moveToNext()) {
String title = cursor.getString(cursor
.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));
String path = cursor.getString(cursor
.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));
Log.e("tag", "title:" + title + " path:" + path);
}
cursor.close();
}

private void scanImage() {
Cursor cursor = getContentResolver().query(
MediaStore.Images.Media.EXTERNAL_CONTENT_URI, null, null, null,
MediaStore.Images.Media.DEFAULT_SORT_ORDER);
// int counter = cursor.getCount();

while (cursor.moveToNext()) {
String title = cursor.getString(cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.TITLE));
String path = cursor.getString(cursor
.getColumnIndexOrThrow(MediaStore.Images.Media.DATA));
Log.e("tag", "title:" + title + " path:" + path);
}
cursor.close();
}

}