preface
Wrote a demo, simple logic is: add a line of text or watermark on a picture, and save to the system album, that is, the picture library on our mobile phone. There is no problem in the front editing pictures to add watermarks, but there is a problem in the back saving to the system album: no pictures can be displayed.
The problem
Three steps to save system albums before Android 10:
- Save the picture to your phone
- Insert the image into your phone’s gallery
- Broadcast updates
The code is as follows:
public static void savePhotoAlbum(Context context, Bitmap bmp) {
// Save the image first
File appDir = new File(Environment.getExternalStorageDirectory(), "Boohee");
if(! appDir.exists()) { appDir.mkdir(); } String fileName = System.currentTimeMillis() +".jpg";
File file = new File(appDir, fileName);
try {
FileOutputStream fos = new FileOutputStream(file);
bmp.compress(CompressFormat.JPEG, 100, fos);
fos.flush();
fos.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
// Next, insert the file into the system gallery
try {
MediaStore.Images.Media.insertImage(context.getContentResolver(),
file.getAbsolutePath(), fileName, null);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
// Finally notify gallery update
context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + path)));
}
Copy the code
Problem: The image is not displayed, that is, not updated to the system gallery.
A careful observer will notice that there are two deprecated methods in the previous code:
MediaStore.Images.Media.insertImage(context.getContentResolver(),
file.getAbsolutePath(), fileName, null);
Copy the code
context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" + path)));
Copy the code
To solve the problem
Here is a solution to the above problem and compatible with Android10 version:
/** * Add watermark and save to system album */
private void imgMerge(a) {
new Thread(() -> {
try {
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.test);
File file = new File(getExternalFilesDir(Environment.DIRECTORY_PICTURES), "newFile.jpg");
if(! file.exists()) { file.createNewFile(); }// Add watermark text position.
Bitmap newBitmap = addTextWatermark(bitmap, "Test the demo sample");
// Save to system album
savePhotoAlbum(newBitmap, file);
} catch (Exception e) {
e.printStackTrace();
}
}).start();
}
/** * save to album **@paramSRC Source image *@paramFile File to be saved */
private void savePhotoAlbum(Bitmap src, File file) {
if (isEmptyBitmap(src)) {
return;
}
// Save to file first
OutputStream outputStream;
try {
outputStream = new BufferedOutputStream(new FileOutputStream(file));
src.compress(Bitmap.CompressFormat.JPEG, 100, outputStream);
if (!src.isRecycled()) {
src.recycle();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
// Update the gallery again
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
ContentValues values = new ContentValues();
values.put(MediaStore.MediaColumns.DISPLAY_NAME, file.getName());
values.put(MediaStore.MediaColumns.MIME_TYPE, getMimeType(file));
values.put(MediaStore.MediaColumns.RELATIVE_PATH, Environment.DIRECTORY_DCIM);
ContentResolver contentResolver = getContentResolver();
Uri uri = contentResolver.insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
if (uri == null) {
return;
}
try {
outputStream = contentResolver.openOutputStream(uri);
FileInputStream fileInputStream = new FileInputStream(file);
FileUtils.copy(fileInputStream, outputStream);
fileInputStream.close();
outputStream.close();
} catch(IOException e) { e.printStackTrace(); }}else {
MediaScannerConnection.scanFile(
getApplicationContext(),
new String[]{file.getAbsolutePath()},
new String[]{"image/jpeg"},
(path, uri) -> {
// Scan Completed}); }}Copy the code
Sending a broadcast and inserting a MediaProvider to add images to an album are officially deprecated. Using the above method on Android 10 and later will effectively solve the problem of not showing images.
Make a note!