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{@Overridepublic 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);}@Overridepublic void onClick(View view){ //下载文件 存放目的地 String downloadPath = Environment.getExternalStorageDirectory().getPath() + "/download_cache"; String url = ""; 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
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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,可以输入看看效果
，带着我的相机和电脑，远离繁华，走向空旷。
