Show And Hide Drop Down List On Button Click?

I am using a button and on clicking it ,a drop down list opens and the arrow sign changes.but I want to hide the drop down list on button's click again.mean to show and hide altern

Solution 1:

You can use boolean.

Lets say..

boolean isButton=true;


     protectedvoidonCreate(Bundle savedInstanceState) {
        myphotosBtn=(Button)findViewById(R.id.myPhotosBtn);
        myphotosBtn.setOnClickListener(newOnClickListener() {

            @OverridepublicvoidonClick(View v) {


            if(isButton){
                        arrowDown.setImageResource(R.drawable.arrow_up);
                       findViewById(R.id.dropdownList).setVisibility(View.VISIBLE);
                       isButton=false;
            }else{
                        arrowDown.setImageResource(R.drawable.down);
                       findViewById(R.id.dropdownList).setVisibility(View.GONE);
                       isButton=true;
                 }
            }
        });

Solution 2:

Try this:

protectedvoidonCreate(Bundle savedInstanceState) {
    myphotosBtn=(Button)findViewById(R.id.myPhotosBtn);
    Boolean temp=false;
    myphotosBtn.setOnClickListener(newOnClickListener() {

        @OverridepublicvoidonClick(View v) {
        if(temp){
           arrowDown.setImageResource(R.drawable.arrow_down);
           findViewById(R.id.dropdownList).setVisibility(View.GONE);
           temp=false;
        }else{

            arrowDown.setImageResource(R.drawable.arrow_up);
            findViewById(R.id.dropdownList).setVisibility(View.VISIBLE);
            temp=true;
        }


        }
    });

Take this as a reference and develop your logic.

Another way to implement this is, Use CheckBox instead of Button, and write onChecked method code. You can achieve this using it also.

Solution 3:

boolean isshow=false;

protectedvoidonCreate(Bundle savedInstanceState) {
    myphotosBtn=(Button)findViewById(R.id.myPhotosBtn);

    myphotosBtn.setOnClickListener(newOnClickListener() {

        @OverridepublicvoidonClick(View v) {
            if(!isshow)
                arrowDown.setImageResource(R.drawable.arrow_up);
                findViewById(R.id.dropdownList).setVisibility(View.VISIBLE);
                isshow=true;
            } else {
                arrowDown.setImageResource(R.drawable.arrow_up);
                findViewById(R.id.dropdownList).setVisibility(View.INVISIBLE);
                isshow=false;
            }
        });

You can use sharedpreferences to store booolean variable value.

Solution 4:

I know this question is already answered, but if you might stumble upon this looking for a dropdown functionality to create a menu: I'd like to point you to this link.

It's Android standard how to create a popup menu (which looks exactly like a dropdown list under a button).