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android – OnClick for Floating Action Button

Posted by: admin May 14, 2020 Leave a comment

Questions:

I’m new to working with floating action button and trying to get a few of the basic things working today. Currently I am stuck on getting the onClick functionality to work. I pulled most of the code from googles FAB basic example, and in there it has an onChecked method which sends a string to a logger to show you have clicked it.

@Override
public void onCheckedChanged(FloatingActionButton fabView, boolean isChecked) {
    // When a FAB is toggled, log the action.

    switch (fabView.getId()){
        case R.id.fab_1:
            break;
        default:
            break;
    }
}

I was thinking I’d be able to replace the functionality in there but that had no affect. So I tried to create the onClickListener like you would with any other button but that also had no affect. I am not sure how to continue since neither option worked. my goal is just to produce a dialog when the floating action button is clicked, but for now I am just trying to use a placeholder alert dialog.

This is the FloatingActionButtonFragment class:

public class FloatingActionButtonFragment extends Fragment implements FloatingActionButton.OnCheckedChangeListener {


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View rootView = inflater.inflate(R.layout.fab_layout, container, false);

        // Make this {@link Fragment} listen for changes in both FABs.
        FloatingActionButton fab1 = (FloatingActionButton) rootView.findViewById(R.id.fab_1);
        fab1.setOnCheckedChangeListener(this);

        fab1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
                builder.setMessage("Are you sure?")
                        .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                            }
                        })
                        .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int id) {
                                // User cancelled the dialog
                            }
                        });
                // Create the AlertDialog object and return it
                AlertDialog dialog = builder.create();
                dialog.show();
            }
        });
        return rootView;
    }

    @Override
    public void onCheckedChanged(FloatingActionButton fabView, boolean isChecked) {
        // When a FAB is toggled, log the action.

        switch (fabView.getId()){
            case R.id.fab_1:
                break;
            default:
                break;
        }
    }

}

And here is the FloatingActionButton class:

public class FloatingActionButton extends FrameLayout implements Checkable {

    /**
     * Interface definition for a callback to be invoked when the checked state
     * of a compound button changes.
     */
    public static interface OnCheckedChangeListener {

        /**
         * Called when the checked state of a FAB has changed.
         *
         * @param fabView   The FAB view whose state has changed.
         * @param isChecked The new checked state of buttonView.
         */
        void onCheckedChanged(FloatingActionButton fabView, boolean isChecked);
    }

    /**
     * An array of states.
     */
    private static final int[] CHECKED_STATE_SET = {
            android.R.attr.state_checked
    };

    private static final String TAG = "FloatingActionButton";

    // A boolean that tells if the FAB is checked or not.
    private boolean mChecked;

    // A listener to communicate that the FAB has changed it's state
    private OnCheckedChangeListener mOnCheckedChangeListener;

    public FloatingActionButton(Context context) {
        this(context, null, 0, 0);
    }

    public FloatingActionButton(Context context, AttributeSet attrs) {
        this(context, attrs, 0, 0);
    }

    public FloatingActionButton(Context context, AttributeSet attrs, int defStyleAttr) {
        this(context, attrs, defStyleAttr, 0);
    }

    public FloatingActionButton(Context context, AttributeSet attrs, int defStyleAttr,
                                int defStyleRes) {
        super(context, attrs, defStyleAttr);

        setClickable(true);

        // Set the outline provider for this view. The provider is given the outline which it can
        // then modify as needed. In this case we set the outline to be an oval fitting the height
        // and width.
        setOutlineProvider(new ViewOutlineProvider() {
            @Override
            public void getOutline(View view, Outline outline) {
                outline.setOval(0, 0, getWidth(), getHeight());
            }
        });

        // Finally, enable clipping to the outline, using the provider we set above
        setClipToOutline(true);
    }

    /**
     * Sets the checked/unchecked state of the FAB.
     * @param checked
     */
    public void setChecked(boolean checked) {
        // If trying to set the current state, ignore.
        if (checked == mChecked) {
            return;
        }
        mChecked = checked;

        // Now refresh the drawable state (so the icon changes)
        refreshDrawableState();

        if (mOnCheckedChangeListener != null) {
            mOnCheckedChangeListener.onCheckedChanged(this, checked);
        }
    }

    /**
     * Register a callback to be invoked when the checked state of this button
     * changes.
     *
     * @param listener the callback to call on checked state change
     */
    public void setOnCheckedChangeListener(OnCheckedChangeListener listener) {
        mOnCheckedChangeListener = listener;
    }

    @Override
    public boolean isChecked() {
        return mChecked;
    }

    @Override
    public void toggle() {
        setChecked(!mChecked);
    }

    /**
     * Override performClick() so that we can toggle the checked state when the view is clicked
     */
    @Override
    public boolean performClick() {
        toggle();
        return super.performClick();
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);

        // As we have changed size, we should invalidate the outline so that is the the
        // correct size
        invalidateOutline();
    }

    @Override
    protected int[] onCreateDrawableState(int extraSpace) {
        final int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
        if (isChecked()) {
            mergeDrawableStates(drawableState, CHECKED_STATE_SET);
        }
        return drawableState;
    }
}

There isn’t much to either class at this point, they are mostly husks, but I just want to get this basic functionality down before I continue, and being the noob I am, I don’t know why this wouldn’t work.

How to&Answers:

If you are not already heading for deadline, you must change the floating action button to the one provided by google in design library
just follow http://android-developers.blogspot.in/2015/05/android-design-support-library.html

Add to the XML Layout:

<android.support.design.widget.FloatingActionButton
        android:id="@+id/myFAB"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/your_icon"
        app:elevation="4dp"
        ... />

Add to the code behind:

FloatingActionButton myFab = (FloatingActionButton) myView.findViewById(R.id.myFAB); 
myFab.setOnClickListener(new View.OnClickListener() { 
    public void onClick(View v) { 
        doMyThing(); 
    } 
});

For more details follow : FloatingActionButton example with Support Library

Answer:

Actually now with android support library it was very easy to add FAB and to customize it with click listeners

    FloatingActionButton fab = findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            // FAB Action goes here
        }
    });

Reference : http://androidgifts.com/android-material-design-floating-action-button-tutorial/

Answer:

To use dialog/Alertdialog with the floating action button you’re using, try changing your onClick(View v) from this

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

to

 AlertDialog.Builder builder = new AlertDialog.Builder(v.getContext());