Android 网络应用重点———使用HttpGet 下载apk文件并安装

本例使用HttpGet 从服务器端下载一个apk文件,然后自动将apk安装到手机上

下载文件原理： 先获得一个InputStream,读取到数据，再写入到目的地(通常写到SD卡)， 概括起来也就是先读再写

主要代码如下:

public class Main extends Activity implements OnClickListener

{

@Override

public void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

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

btnDownloadInstallApk.setOnClickListener(this);

}

//安装apk文件

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); //浏览网页的Action(动作)

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

intent.setDataAndType(Uri.fromFile(file), type); //设置数据类型

startActivity(intent);

}

@Override

public void onClick(View view)

{

//下载文件 存放目的地

String downloadPath = Environment.getExternalStorageDirectory().getPath() + "/download_cache";

String url = "http://192.168.1.123/oa/apk/action.apk";

File file = new File(downloadPath);

if(!file.exists())

file.mkdir();

HttpGet httpGet = new HttpGet(url);

try

{

HttpResponse httpResponse = new DefaultHttpClient().execute(httpGet);

if (httpResponse.getStatusLine().getStatusCode() == 200)

{

InputStream is = httpResponse.getEntity().getContent();

// 开始下载apk文件

FileOutputStream fos = new FileOutputStream(downloadPath + "/action.apk");

byte[] buffer = new byte[8192];

int count = 0;

while ((count = is.read(buffer)) != -1)

{

fos.write(buffer, 0, count);

}

fos.close();

is.close();

//安装 apk 文件

installApk(downloadPath+ "/action.apk");

}

} catch (Exception e){}

}

}

示意图

1.

2.



3.

4.


具体代码请参见 ch09_remoteinstallapk工程，在这里要先运行服务器端oa工程,可以输入http://192.168.1.123/oa/apk/action.apk看看效果