Image not save in the device when click the button

Question

Currently, I am using the Picasso library to download images and save it in the device when I press the button. the problem is when I press the button the image not download and

Answer 1

Inside,

onCreate(){
       setContentView(..);
       // requestPermission. ask for permission when app starts.
}    

        @Override
        public void onClick(View v) {
            if (checkPermission()) {
                String URL = intent.getStringExtra("imageUrl");
                SaveImage (URL);
            }
        }

// kind of this, add this block to your existing code.

  private void requestPermission() {
      if (ActivityCompat.shouldShowRequestPermissionRationale(MainActivity.this, android.Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
         Toast.makeText(MainActivity.this, "Write External Storage permission allows us to save files. Please allow this permission in App Settings.", Toast.LENGTH_LONG).show();
      } else {
         ActivityCompat.requestPermissions(MainActivity.this, new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}, PERMISSION_REQUEST_CODE);
      }
   }

// make sure Manifest has all the permission defined