Android: An Example of uploading images (1)

Android: An Example of uploading images (1)

First:

Layout is:

Here we convert an image under the Local SD root directory into Bitmap and save it to the tmp folder to be uploaded:

Private class LoadPhotoTask extends AsyncTask
 
  
{Private Bitmap mLoadedBitmap = null; protected Boolean doInBackground (Void... params) {try {if (mFilePathName. length ()> 0) {File file = new File (mFilePathName); if (! File. exists () {return false;} BitmapFactory. options opt = new BitmapFactory. options (); long fileSize = file. length (); int maxSize = 2*1024*1024; if (fileSize <= maxSize) {opt. inSampleSize = 1;} else if (fileSize <= maxSize * 4 ){
  // Less than 8 MOpt. inSampleSize = 2;} else {long times = fileSize/maxSize; opt. inSampleSize = (int) (Math. log (times)/Math. log (2.0) + 1;
  // Math. log returns the base-e logarithm.} Try {mLoadedBitmap = BitmapFactory. decodeFile (mFilePathName, opt );
  // Opt is a zoom-in multipleMUploadFilePathName = SaveBitmapToFile (mLoadedBitmap);} catch (OutOfMemoryError e) {Toast. makeText (UploadPhotoActivity. this, getResources (). getString (R. string. no_memory_to_view_photo), Toast. LENGTH_SHORT ). show (); UploadPhotoActivity. this. finish () ;}return true;} catch (Exception e) {Log. e ("UploadPhotoActivity", "doInBackground", e); return false ;}} protected void onPostExecute (Boolean result) {try {sho WLoadPreviewProgressBar (false); if (mLoadedBitmap! = Null) {ImageView IamgePreView = (ImageView) findViewById (R. id. photo_upload_preview_image); IamgePreView. setImageBitmap (mLoadedBitmap);} else {} mLoadedBitmap = null;} catch (Exception e) {Log. e ("UploadPhotoActivity", "onPostExecute", e );}}}
 

Private String SaveBitmapToFile (Bitmap bmp) {if (null = bmp) {return null;} String fileName = "upload_tmp.jpg ";File f = this. getFileStreamPath (fileName );// Data/com. example. tianqitongtest/files/upload_tmp.jpg. This is the location where the file to be uploaded is stored if (f. exists () {f. delete ();} FileOutputStream ostream; try {Int targetWidth = 780; int w = bmp. getWidth (); if (w> targetWidth) {int h = bmp. getHeight (); int targetHeight = (targetWidth * h)/w; bmp = Bitmap. createScaledBitmap (bmp, targetWidth, targetHeight, true); // generate a new Bitmap Based on the specified width and height}Ostream = this. openFileOutput (fileName, MODE_PRIVATE); bmp. compress (Bitmap. compressFormat. JPEG, 70, ostream); ostream. flush (); ostream. close (); ostream = null;} catch (Exception e) {// TODO Auto-generated catch blocke. printStackTrace ();} return f. getAbsolutePath ();}

During upload, You need to collapse the keyboard:

private void hideInputMethod(){View view = getCurrentFocus();if(view != null){    ((InputMethodManager)getSystemService(INPUT_METHOD_SERVICE)).hideSoftInputFromWindow(view.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);}}

The path to the image 11.jpg on the SD card is as follows:

private String getStoredPicPath() {String fileName = "11.jpg";return Environment.getExternalStorageDirectory()+"/"+fileName;}