<uses-permission android:name="android.permission.INTERNET" />

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />

    <uses-permission android:name="android.permission.INSTALL_PACKAGES"/>

package com.exmple.httpxutil;

import java.io.File;

import android.annotation.SuppressLint;

import android.app.Activity;

import android.content.Intent;

import android.content.pm.PackageInfo;

import android.content.pm.PackageManager;

import android.content.pm.PackageManager.NameNotFoundException;

import android.content.pm.Signature;

import android.net.Uri;

import android.os.Bundle;

import android.os.Environment;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.ProgressBar;

import com.lidroid.xutils.HttpUtils;

import com.lidroid.xutils.exception.HttpException;

import com.lidroid.xutils.http.HttpHandler;

import com.lidroid.xutils.http.ResponseInfo;

import com.lidroid.xutils.http.callback.RequestCallBack;

public class MainActivity extends Activity {

	HttpHandler<File> h;

	private ProgressBar pa;

	@SuppressLint("SdCardPath")

	@Override

	protected void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.activity_main);

		Button button = (Button) findViewById(R.id.button);

		pa = (ProgressBar) findViewById(R.id.pro);

		Button more = (Button) findViewById(R.id.more);

		getCode();

		more.setOnClickListener(new OnClickListener() {

			@Override

			public void onClick(View v) {

				Intent ints = new Intent(MainActivity.this, NewActivity.class);

				startActivity(ints);

			}

		});

		button.setOnClickListener(new OnClickListener() {

			@Override

			public void onClick(View v) {

				HttpUtils http = new HttpUtils();

				final String path = Environment.getExternalStorageDirectory()

						.getPath();

				System.out.println(path);

				h = http.download(

						"http://101.200.142.201:8080/tqyb/baidumap.apk", path

								+ "/badumap.apk", true, true,

						new RequestCallBack<File>() {

							@Override

							public void onStart() {

								System.out.println("===");

								System.out.println("开始下载了++++++++++++++");

							}

							@Override

							public void onLoading(long total, long current,

									boolean isUploading) {

								System.out.println(total + "=====");

								System.out.println(current + "=====");

								System.out.println(isUploading + "=====");

								pa.setMax((int) total);

								pa.setProgress((int) current);

							}

							@Override

							public void onFailure(HttpException error,

									String msg) {

								System.out.println(error + "+++++++" + msg

										+ "+++++++++");

							}

							@Override

							public void onSuccess(

									ResponseInfo<File> responseInfo) {

								h.cancel();

								installApk(path + "/badumap.apk");

							}

						});

			}

		});

	}

//安装的方法

	private void installApk(String filename) {

		File file = new File(filename);

		Intent intent = new Intent();

		intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

		intent.setAction(Intent.ACTION_VIEW);

		String type = "application/vnd.android.package-archive";

		intent.setDataAndType(Uri.fromFile(file), type);

		startActivity(intent);

	}

//等到版本号的代码

	private void getCode() {

		PackageManager manager;

		PackageInfo info = null;

		manager = this.getPackageManager();

		try {

			info = manager.getPackageInfo(this.getPackageName(), 0);

			String name = info.versionName;

			int versionCode = info.versionCode;

			String packageName = info.packageName;

			Signature[] signatures = info.signatures;

			System.out.println(name + "++++++++++" + versionCode + "+++++"

					+ packageName + "========nnn" + signatures

					+ "=============");

			/*

			 * info.versionName;

			 *

			 * info.packageName;

			 *

			 * info.signatures;

			 */

		} catch (NameNotFoundException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

	}

}