Android 扫描音乐文件、两种方式获取文件最新修改时间

package com.example.demo_mediascanner;import java.io.File;import java.util.Calendar;import java.util.Date;import android.net.Uri;import android.os.Bundle;import android.os.Environment;import android.provider.MediaStore;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.content.IntentFilter;import android.database.Cursor;import android.util.Log;import android.view.Menu;import android.view.View;/** * 扫描音乐 --scanner music * @author alan * */public class MainActivity extends Activity {private Cursor cursor ;Calendar cal = Calendar.getInstance();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);    IntentFilter intentfilter = new IntentFilter(Intent.ACTION_MEDIA_SCANNER_STARTED);      intentfilter.addAction(Intent.ACTION_MEDIA_SCANNER_FINISHED);        intentfilter.addDataScheme("file");        MediaScannerReceiver receiver = new MediaScannerReceiver();      registerReceiver(receiver, intentfilter);          sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED, Uri.parse("file://"                    + Environment.getExternalStorageDirectory())));    }public void scanFileAsync(Context ctx, String filePath) {Intent scanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);scanIntent.setData(Uri.fromFile(new File(filePath)));ctx.sendBroadcast(scanIntent);}public void scanner(View view){cursor =   getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null,null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);Thread thread = new Thread(){int n;@Overridepublic void run() {while (cursor.moveToNext()) {//歌曲的名称 ：MediaStore.Audio.Media.TITLEString tilte = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));  //歌曲文件的路径 ：MediaStore.Audio.Media.DATAString url = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));  //方法1：歌曲文件的修改时间 （注意：精确到秒，所以还要*1000）：MediaStore.Audio.Media.DATE_MODIFIEDlong updateTime= cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATE_MODIFIED)); updateTime = updateTime*1000;//方法2：获取最新修改时间File file = new File(url);long time = file.lastModified();//格式化时间，获取年，月，日String[] times =  getTimeInfo(updateTime);//Log.i("TAG", "tilte:"+tilte);Log.i("TAG", "url:"+url);Log.i("TAG", "times:"+times[0]+times[1]+times[2]);n++;}Log.i("TAG", "n====>"+n);Log.i("TAG", "getCount====>"+cursor.getCount());}};thread.start();}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}/** * 获取时间（年月日） * @return */public String[] getTimeInfo(long time){String[] times  = new String[3];Date date = new Date(time);cal.setTime(date); times[0] = cal.get(Calendar.YEAR)+"";         times[1]= (cal.get(Calendar.MONTH)+1)+"";//calendar月份从0-11         times[2]= cal.get(Calendar.DAY_OF_MONTH)+"";return times;}}