Android初级教程XUtils实现“断点续传”下载

对于“断电续传”，在任何开发中都显得很重要。xutils对此封装的很好了，可以很简单的实现很多下载功能，其中就包括“断点续传”

主要代码如下：

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;@Overrideprotected 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@Overridepublic void onSuccess(ResponseInfo<File> arg0) {Toast.makeText(MainActivity.this, arg0.result.getPath(), 0).show();}//下载失败调用@Overridepublic void onFailure(HttpException arg0, String arg1) {// TODO Auto-generated method stubtv_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@Overridepublic void onLoading(long total, long current,boolean isUploading) {// TODO Auto-generated method stubsuper.onLoading(total, current, isUploading);pb.setMax((int)total);pb.setProgress((int)current);tv_progress.setText(current * 100 / total + "%");}});}}

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