Android初级教程XUtils实现“断点续传”下载

package com.itydl.xutils;

import java.io.File;

import com.lidroid.xutils.HttpUtils;
import com.lidroid.xutils.exception.HttpException;
import com.lidroid.xutils.http.ResponseInfo;
import com.lidroid.xutils.http.callback.RequestCallBack;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

private TextView tv_failure;
private TextView tv_progress;
private ProgressBar pb;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv_failure = (TextView) findViewById(R.id.tv_failure);
tv_progress = (TextView) findViewById(R.id.tv_progress);
pb = (ProgressBar) findViewById(R.id.pb);
}

public void click(View v){
HttpUtils utils = new HttpUtils();
String fileName = "QQPlayer.exe";
//确定下载地址
String path = "http://192.168.1.104:8080/" + fileName;
utils.download(path, //下载地址
"sdcard/QQPlayer.exe", //文件保存路径
true,//是否支持断点续传
true, new RequestCallBack<File>() {

//下载成功后调用
@Override
public void onSuccess(ResponseInfo<File> arg0) {
Toast.makeText(MainActivity.this, arg0.result.getPath(), 0).show();

}

//下载失败调用
@Override
public void onFailure(HttpException arg0, String arg1) {
// TODO Auto-generated method stub
tv_failure.setText(arg1);
}

//进度条显示下载进度，而且即使断网，点击下载按钮仍然在原来位置下载
@Override
public void onLoading(long total, long current,
boolean isUploading) {
// TODO Auto-generated method stub
super.onLoading(total, current, isUploading);
pb.setMax((int)total);
pb.setProgress((int)current);
tv_progress.setText(current * 100 / total + "%");
}
});
}

}