之前一直在CSND发布文章，不过慢慢被简书的排版布局所吸引，打算迁到这个平台，这个是第一篇文章

下载并安装apk的方法很多，最好的方法是放在service中处理，这样在页面切换或者程序退出的时候，仍然可以正常的下载并弹出安装窗口。写下来主要是给自己留给备份，同时可作为分享用。

代码比较简单，分如下几块：

启动下载

private void startDownload() {

dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);

DownloadManager.Request request = new DownloadManager.Request(

Uri.parse("http://d.koudai.com/com.koudai.weishop/1000f/weishop_1000f.apk"));

request.setMimeType("application/vnd.android.package-archive");

request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "myApp.apk");

enqueue = dm.enqueue(request);

}

然后是监听下载完成的Receive

receiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

intent = new Intent(Intent.ACTION_VIEW);

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory() + "/download/myApp.apk")),

"application/vnd.android.package-archive");

startActivity(intent);

stopSelf();

}

};

在监听到下载的文件后，会调用stopSelf自动关闭该service

然后，就是在activity中，启动该service

startService(new Intent(context, DownloadService.class));

完整的代码如下：

public class DownloadService extends Service {

private DownloadManager dm;

private long enqueue;

private BroadcastReceiver receiver;

@Nullable

@Override

public IBinder onBind(Intent intent) {

return null;

}

@Override

public int onStartCommand(Intent intent, int flags, int startId) {

receiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

intent = new Intent(Intent.ACTION_VIEW);

intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

intent.setDataAndType(Uri.fromFile(new File(Environment.getExternalStorageDirectory() + "/download/myApp.apk")),

"application/vnd.android.package-archive");

startActivity(intent);

stopSelf();

}

};

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

startDownload();

return Service.START_STICKY;

}

@Override

public void onDestroy() {

unregisterReceiver(receiver);

super.onDestroy();

}

private void startDownload() {

dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);

DownloadManager.Request request = new DownloadManager.Request(

Uri.parse("http://d.koudai.com/com.koudai.weishop/1000f/weishop_1000f.apk"));

request.setMimeType("application/vnd.android.package-archive");

request.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, "myApp.apk");

enqueue = dm.enqueue(request);

}

}

很简单的一篇文章，希望对大家有所帮助