Android初级教程XUtils实现“断点续传”下载

时间：2024-06-25 08:07:31

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;

	@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 + "%");

					}

				});

	}

}

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