src/com/android/calculator2/HapticImageButton.java

/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.calculator2;

import android.widget.ImageButton;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.MotionEvent;
import android.view.HapticFeedbackConstants;

/**
 * A basic ImageButton that vibrates on finger down.
 */
public class HapticImageButton extends ImageButton {
    public HapticImageButton(Context context) {
        super(context);
        initVibration(context);
    }

    public HapticImageButton(Context context, AttributeSet attrs) {
        super(context, attrs);
        initVibration(context);
    }

    public HapticImageButton(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        initVibration(context);
    }

    public HapticImageButton(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        initVibration(context);
    }

    private void initVibration(Context context) {
        setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if (event.getAction() == MotionEvent.ACTION_DOWN) {
                    performHapticFeedback(HapticFeedbackConstants.VIRTUAL_KEY);
                }

                // Passthrough
                return false;
            }
        });
    }
}