通过DownloadManager来下载APK到本地,下载完成后收到广播再安装APK,可用在软件更新等场合。

添加权限

Activity源码

package com.example.administrator.downloadtest;

import android.app.Activity;

import android.app.DownloadManager;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.content.IntentFilter;

import android.net.Uri;

import android.os.Bundle;

import android.view.View;

import android.webkit.MimeTypeMap;

import android.widget.Button;

public class MainActivity extends Activity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

Button btDownload = (Button) findViewById(R.id.bt_download);

btDownload.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

downloadApk();

}

});

/**注册下载完成广播**/

registerReceiver(downloadCompleteReceiver, new IntentFilter(DownloadManager.ACTION_DOWNLOAD_COMPLETE));

}

/**下载APK**/

private void downloadApk() {

String apkUrl = "http://192.168.1.1/downloadtest.apk";

Uri uri = Uri.parse(apkUrl);

DownloadManager downloadManager = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);

DownloadManager.Request request = new DownloadManager.Request(uri);

// 设置允许使用的网络类型，这里是移动网络和wifi都可以

request.setAllowedNetworkTypes(request.NETWORK_MOBILE| request.NETWORK_WIFI);

//设置是否允许漫游

request.setAllowedOverRoaming(false);

//设置文件类型

MimeTypeMap mimeTypeMap = MimeTypeMap.getSingleton();

String mimeString = mimeTypeMap.getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(apkUrl));

request.setMimeType(mimeString);

//在通知栏中显示

request.setNotificationVisibility(request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED);

request.setTitle("download...");

request.setVisibleInDownloadsUi(true);

//sdcard目录下的download文件夹

request.setDestinationInExternalPublicDir("/download", "downloadtest.apk");

// 将下载请求放入队列

downloadManager.enqueue(request);

}

private BroadcastReceiver downloadCompleteReceiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

/**下载完成后安装APK**/

installApk();

}

};

private void installApk() {

Intent i = new Intent(Intent.ACTION_VIEW);

String filePath = "/sdcard/download/downloadtest.apk";

i.setDataAndType(Uri.parse("file://" + filePath), "application/vnd.android.package-archive");

startActivity(i);

}

}