Save Image From ImageView to Gallery in Android Studio - Android Studio Tutorials

 in AndroidManifest.xml

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

in MainActivity.java

on Create Method

ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 1);

image saving method

private void saveImg() {

    imgQrCode.setDrawingCacheEnabled(true);
    imgQrCode.buildDrawingCache();
    imgQrCode.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);

    Bitmap bitmap = imgQrCode.getDrawingCache();

    String root = Environment.getExternalStorageDirectory().getAbsolutePath();
    File file = new File(root + "/Download");
    String filename = String.format("%d.png",System.currentTimeMillis());
    File myfile = new File(file, filename);

    if(myfile.exists()){
        myfile.delete();
    }

    try {
        FileOutputStream fileOutputStream = new FileOutputStream(myfile);
        bitmap.compress(Bitmap.CompressFormat.PNG,100,fileOutputStream);
        fileOutputStream.flush();
        fileOutputStream.close();

        Toast.makeText(this, "Saved", Toast.LENGTH_SHORT).show();

        imgQrCode.setDrawingCacheEnabled(false);

    }catch (Exception e){
        e.printStackTrace();
        Toast.makeText(this, "Error" + e.toString(), Toast.LENGTH_SHORT).show();
    }

}

Android Studio Tutorials