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 {@Overridepublic 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();}}