First, you need to get your Bitmap. You can already have it as an object Bitmap, or you can try to get it from the ImageView such as:
BitmapDrawable drawable = (BitmapDrawable) mImageView1.getDrawable();
Bitmap bitmap = drawable.getBitmap();
Then you must get to directory (a File object) from SD Card such as:
File sdCardDirectory = Environment.getExternalStorageDirectory();
Next, create your specific file for image storage:
File image = new File(sdCardDirectory, "test.png");
After that, you just have to write the Bitmap thanks to its method compress such as:
boolean success = false;
// Encode the file as a PNG image.
FileOutputStream outStream;
try {
outStream = new FileOutputStream(image);
bitmap.compress(Bitmap.CompressFormat.PNG, 100, outStream);
/* 100 to keep full quality of the image */
outStream.flush();
outStream.close();
success = true;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
Finally, just deal with the boolean result if needed. Such as:
if (success) {
Toast.makeText(getApplicationContext(), "Image saved with success",
Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(),
"Error during image saving", Toast.LENGTH_LONG).show();
}
Don't forget to add the following permission in your Manifest:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>