How to open phones gallery through code

Question

I wanna to open phones gallery through a button click.
In my activity I have a button, I want to open the gallery through that button click.

Answer 1

To bind your button click listener: (This should be in your onCreate method.)

ImageButton btn_choose_photo = (ImageButton) findViewById(R.id.add_photo_choose_photo); // Replace with id of your button.
btn_choose_photo.setOnClickListener(btnChoosePhotoPressed);

To open gallery: (This should be in your activity class.)

public OnClickListener btnChoosePhotoPressed = new OnClickListener() {      
    @Override
    public void onClick(View v) {
        Intent i = new Intent(Intent.ACTION_PICK,
                   android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI);
        final int ACTIVITY_SELECT_IMAGE = 1234;
        startActivityForResult(i, ACTIVITY_SELECT_IMAGE); 
    }
};

To get the chosen image: (This should be in your activity class.)

protected void onActivityResult(int requestCode, int resultCode, Intent data) 
{
    super.onActivityResult(requestCode, resultCode, data); 

    switch(requestCode) { 
    case 1234:
        if(resultCode == RESULT_OK){  
            Uri selectedImage = data.getData();
            String[] filePathColumn = {MediaStore.Images.Media.DATA};

            Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);
            cursor.moveToFirst();

            int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
            String filePath = cursor.getString(columnIndex);
            cursor.close();


            Bitmap yourSelectedImage = BitmapFactory.decodeFile(filePath);
            /* Now you have choosen image in Bitmap format in object "yourSelectedImage". You can use it in way you want! */
        }
    }

};