// One Button 
Button BSelectImage; 

// One Preview Image 
ImageView IVPreviewImage; 

// constant to compare 
// the activity result code 
int SELECT_PICTURE = 200; 

@Override
protected void onCreate(Bundle savedInstanceState) { 
	super.onCreate(savedInstanceState); 
	setContentView(R.layout.activity_main); 

	// register the UI widgets with their appropriate IDs 
	BSelectImage = findViewById(R.id.BSelectImage); 
	IVPreviewImage = findViewById(R.id.IVPreviewImage); 

	// handle the Choose Image button to trigger 
	// the image chooser function 
	BSelectImage.setOnClickListener(new View.OnClickListener() { 
		@Override
		public void onClick(View v) { 
			imageChooser(); 
		} 
	}); 
} 

// this function is triggered when 
// the Select Image Button is clicked 
void imageChooser() { 

	// create an instance of the 
	// intent of the type image 
	Intent i = new Intent(); 
	i.setType("image/*"); 
	i.setAction(Intent.ACTION_GET_CONTENT); 

	// pass the constant to compare it 
	// with the returned requestCode 
	startActivityForResult(Intent.createChooser(i, "Select Picture"), SELECT_PICTURE); 
} 

// this function is triggered when user 
// selects the image from the imageChooser 
public void onActivityResult(int requestCode, int resultCode, Intent data) { 
	super.onActivityResult(requestCode, resultCode, data); 

	if (resultCode == RESULT_OK) { 

		// compare the resultCode with the 
		// SELECT_PICTURE constant 
		if (requestCode == SELECT_PICTURE) { 
			// Get the url of the image from data 
			Uri selectedImageUri = data.getData(); 
			if (null != selectedImageUri) { 
				// update the preview image in the layout 
				IVPreviewImage.setImageURI(selectedImageUri); 
			} 
		} 
	} 
} 

#  One Preview Image 
IVPreviewImage = ImageView()

#  constant to compare 
#  the activity result code 
SELECT_PICTURE = 200

def onCreate(self, savedInstanceState):
    """ generated source for method onCreate """
    super(MainActivity, self).onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
    #  register the UI widgets with their appropriate IDs 
    self.BSelectImage = findViewById(R.id.BSelectImage)
    self.IVPreviewImage = findViewById(R.id.IVPreviewImage)
    #  handle the Choose Image button to trigger 
    #  the image chooser function 
    self.BSelectImage.setOnClickListener(View.OnClickListener())

#  this function is triggered when 
#  the Select Image Button is clicked 
def imageChooser(self):
    """ generated source for method imageChooser """
    #  create an instance of the 
    #  intent of the type image 
    i = Intent()
    i.setType("image/*")
    i.setAction(Intent.ACTION_GET_CONTENT)
    #  pass the constant to compare it 
    #  with the returned requestCode 
    startActivityForResult(Intent.createChooser(i, "Select Picture"), self.SELECT_PICTURE)

#  this function is triggered when user 
#  selects the image from the imageChooser 
def onActivityResult(self, requestCode, resultCode, data):
    """ generated source for method onActivityResult """
    super(MainActivity, self).onActivityResult(requestCode, resultCode, data)
    if resultCode == RESULT_OK:
        #  compare the resultCode with the 
        #  SELECT_PICTURE constant 
        if requestCode == SELECT_PICTURE:
            #  Get the url of the image from data 
            if None != selectedImageUri:
                #  update the preview image in the layout 
                self.IVPreviewImage.setImageURI(selectedImageUri)