android建立檔案夾和檔案和安裝其他apk

一、android下建立檔案夾

File sd=Environment.getExternalStorageDirectory();        String path=sd.getPath()+"/notes";        File file=new File(path);        if(!file.exists())           file.mkdir();

二、android下建立檔案

HttpClient httpClient = new DefaultHttpClient();HttpGet httpGet= new HttpGet("http://img3.3lian.com/2006/016/09/031.jpg");HttpResponse httpResponse = httpClient.execute(httpGet);if(httpResponse.getStatusLine().getStatusCode() == 200){ total_length = httpResponse.getEntity().getContentLength(); is = httpResponse.getEntity().getContent() ;              File file = new File(Environment.getExternalStorageDirectory(), "aupdata.jpg");              fos = new FileOutputStream(file);              bis = new BufferedInputStream(is);              byte[] buffer = new byte[1024];           byte [] result_two = new byte [(int) total_length];         int len = 0;             int total=0;          while((len = bis.read(buffer)) > -1){        System.arraycopy(buffer, 0, result_two, total, len);                        fos.write(buffer, 0, len);        total = total + len ;                   }        }

FileOutputStream定義檔案後，用.write方法寫入內容，就可以建立對應檔案了。

三、android安裝其他apk

                        Intent intent = new Intent();intent.setAction(Intent.ACTION_VIEW);File install_file = new File(Environment.getExternalStorageDirectory() , "MyWeb.apk");intent.setDataAndType(Uri.fromFile(install_file), "application/vnd.android.package-archive");startActivity(intent);