Android 下载App

转载：http://blog.csdn.net/aicpzl/article/details/52993074

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

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

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);
    }
}