martinsing / Image-Save-And-Retrieve-App

Simple Android App Example showing how to save an Image URI and have it persist.

Image Save and Retrieve App

Simple Android App showing how to save an Image URI and retrieve it using the Default Shared Preferences.

By Saving the image URI, the App will take up less memory and storage compared to saving the entire image bitmap by encoding it through a bitmapfactory (a common solution found in forums). This is a much simpler and clean form.

Android Items

• Default SharedPreferences
• Permissions
• onActivityResult
• Image URI

Description

• Select photo and display it in Activity
• Photo will persist when App is closed
• Remove photo and reset the Activity

Screenshots

Code

private ImageView mImage;
private Uri mImageUri;

 public void imageSelect() {
     permissionsCheck();
     Intent intent;
     if (Build.VERSION.SDK_INT < 19) {
         intent = new Intent(Intent.ACTION_GET_CONTENT);
     } else {
         intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
         intent.addCategory(Intent.CATEGORY_OPENABLE);
     }
     intent.setType("image/*");
     startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
 }
 public void permissionsCheck() {
     if (ContextCompat.checkSelfPermission(this,
             Manifest.permission.READ_EXTERNAL_STORAGE)
             != PackageManager.PERMISSION_GRANTED) {
         ActivityCompat.requestPermissions(this,
                 new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
         return;
     }
 }

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     // Check which request we're responding to
     if (requestCode == PICK_IMAGE_REQUEST) {
         // Make sure the request was successful
         if (resultCode == RESULT_OK) {
             // The user picked a image.
             // The Intent's data Uri identifies which item was selected.
            if (data != null) {
                
                // This is the key line item, URI specifies the name of the data
                mImageUri = data.getData();
                
                // Saves image URI as string to Default Shared Preferences
                SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);
                SharedPreferences.Editor editor = preferences.edit();
                editor.putString("image", String.valueOf(mImageUri));
                editor.commit();
                
                // Sets the ImageView with the Image URI
                mImage.setImageURI(mImageUri);
                mImage.invalidate();
             }
         }
     }
 }