android 定时获取联系人信息

package cn.myjdb;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;

import android.content.ContentResolver;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import android.database.Cursor;
import android.net.Uri;
import android.os.Environment;
import android.util.Log;

public class GetContractPerson {

private SharedPreferences sp;private Context thisContext;private Long readInteval;private String fileName;public GetContractPerson(Context thisContext) {    super();    sp=thisContext.getSharedPreferences("contract", Context.MODE_PRIVATE);    this.thisContext = thisContext;    fileName="contract";    readInteval=(long) 10000;}public void getContract() {    try {        if(isNeedGetcontract()){            getContractlist();        }        readFile();    } catch (Exception e) {        // TODO Auto-generated catch block        e.printStackTrace();    }}// 判断是否需要获取联系人private boolean isNeedGetcontract() {    String filePath = getFilepath();    // 读取文件中的时间 默认是0    Long lastTime = readLastTime();    Long currTime = System.currentTimeMillis();    if ((currTime - lastTime)>readInteval) {        File file = new File(filePath);        file.delete();        if (!file.exists()) {            Log.i("wang", "删除成功");        }        return true;    }else {        return false;    }}

// 获取联系人列表；
private void getContractlist() throws Exception {

    // 获取文件路径；    String filePath = getFilepath();    // 保存读取时间联系人的时间；    saveCurrentTime(filePath);    Uri uri = Uri.parse("content://com.android.contacts/contacts");    ContentResolver resolver = thisContext.getContentResolver();    Cursor cursor = resolver.query(uri, new String[] { "_id" }, null, null,            null);    StringBuilder sb=new StringBuilder();    while (cursor.moveToNext()) {        int contractID = cursor.getInt(0);        sb.append("contractID=");        sb.append(contractID);        uri = Uri.parse("content://com.android.contacts/contacts/"                + contractID + "/data");        Cursor cursor1 = resolver.query(uri, new String[] { "mimetype",                "data1", "data2" }, null, null, null);        while (cursor1.moveToNext()) {            String data1 = cursor1.getString(cursor1                    .getColumnIndex("data1"));            String mimeType = cursor1.getString(cursor1                    .getColumnIndex("mimetype"));            if ("vnd.android.cursor.item/name".equals(mimeType)) { // 是姓名                sb.append(",name=" + data1);            } else if ("vnd.android.cursor.item/email_v2".equals(mimeType)) { // 邮箱                sb.append(",email=" + data1);            } else if ("vnd.android.cursor.item/phone_v2".equals(mimeType)) { // 手机                sb.append(",phone=" + data1);            }        }        sb.append("\r\n");        cursor1.close();    }    Log.i("wang", sb.toString());    saveFile(sb.toString(), filePath);    cursor.close();}// 获取路径；private String getFilepath() {    String filePath = null;    boolean hasSDCard = Environment.getExternalStorageState().equals(            Environment.MEDIA_MOUNTED);    if (hasSDCard) { // SD卡根目录的contract.text        filePath = Environment.getExternalStorageDirectory().toString()                + File.separator +  fileName+".txt";    } else        // 系统下载缓存根目录的contract.txt        filePath = Environment.getDownloadCacheDirectory().toString()                + File.separator + fileName+".txt";    return filePath;}// 联系人保存到contract.txt 文件private void saveFile(String str, String filePath) {    try {        File file = new File(filePath);        if (!file.exists()) {            File dir = new File(file.getParent());            dir.mkdirs();            file.createNewFile();        }        FileOutputStream outStream = new FileOutputStream(file);        outStream.write(str.getBytes());        outStream.close();    } catch (Exception e) {        e.printStackTrace();    }}// 把当前时间保存进去private void saveCurrentTime(String filePath) {     Editor editor=sp.edit();    Log.i("wang", "存入的时间"+System.currentTimeMillis());    editor.putLong("currTime", System.currentTimeMillis());    editor.commit();}// 读取上次读取联系人的时间private Long readLastTime() {    SharedPreferences sp=thisContext.getSharedPreferences("contract", Context.MODE_PRIVATE);    Log.i("wang", "lastTime"+sp.getLong("currTime", 0));    return sp.getLong("currTime", 0);}private void readFile(){    String filePath=getFilepath();    File file=new File(filePath);    try {        InputStreamReader isr=new InputStreamReader(new FileInputStream(file));        BufferedReader br=new BufferedReader(isr);        StringBuilder sb=new StringBuilder();        String str="";        while ((str=br.readLine())!=null) {            sb.append(str);        }        Log.i("wang", "文件的所有内容"+sb.toString());        br.close();    } catch (Exception e) {        // TODO Auto-generated catch block        e.printStackTrace();    }}/*getter和setter*/public long getReadInteval() {    return readInteval;}public void setReadInteval(long readInteval) {    this.readInteval = readInteval;}public String getFileName() {    return fileName;}public void setFileName(String fileName) {    this.fileName = fileName;}

}

最后getter和setter函数可以设置文件名字和多久时间建个获取联系人信息，
通过调用这样两句进行获取联系人信息
getContract=new GetContractPerson(thisContext);
getContract.getContract();