Button.java

package com.tekinarslan.material.sample;

import android.content.Context;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.LayerDrawable;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.widget.RelativeLayout;
import android.widget.TextView;

public abstract class Button extends RelativeLayout {

    final static String MATERIAL_DESIGNXML = "http://schemas.android.com/apk/res-auto";
    final static String ANDROIDXML = "http://schemas.android.com/apk/res/android";

    public boolean isLastTouch = false;
    int minWidth;
    int minHeight;
    int background;
    float rippleSpeed = 10f;
    int rippleSize = 3;
    OnClickListener onClickListener;
    int backgroundColor = Color.parseColor("#1E88E5");

    public Button(Context context, AttributeSet attrs) {
        super(context, attrs);
        setDefaultProperties();
    }

    protected void setDefaultProperties() {
        setMinimumHeight(dpToPx(minHeight, getResources()));
        setMinimumWidth(dpToPx(minWidth, getResources()));
        setBackgroundResource(background);
        setBackgroundColor(backgroundColor);
    }

    public int dpToPx(float dp, Resources resources) {
        float px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, resources.getDisplayMetrics());
        return (int) px;
    }
    // Set atributtes of XML to View


    // ### RIPPLE EFFECT ###

    float x = -1, y = -1;
    float radius = -1;

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        isLastTouch = true;
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            radius = getHeight() / rippleSize;
            x = event.getX();
            y = event.getY();
        } else if (event.getAction() == MotionEvent.ACTION_MOVE) {
            radius = getHeight() / rippleSize;
            x = event.getX();
            y = event.getY();
            if (!((event.getX() <= getWidth() && event.getX() >= 0) &&
                    (event.getY() <= getHeight() && event.getY() >= 0))) {
                isLastTouch = false;
                x = -1;
                y = -1;
            }
        } else if (event.getAction() == MotionEvent.ACTION_UP) {
            if ((event.getX() <= getWidth() && event.getX() >= 0) &&
                    (event.getY() <= getHeight() && event.getY() >= 0)) {
                radius++;
            } else {
                isLastTouch = false;
                x = -1;
                y = -1;
            }
        }
        return true;
    }

    @Override
    protected void onFocusChanged(boolean gainFocus, int direction,
                                  Rect previouslyFocusedRect) {
        if (!gainFocus) {
            x = -1;
            y = -1;
        }
    }

    public Bitmap makeCircle() {
        Bitmap output = Bitmap.createBitmap(getWidth() - dpToPx(6, getResources()),
                getHeight() - dpToPx(7, getResources()), Config.ARGB_8888);
        Canvas canvas = new Canvas(output);
        canvas.drawARGB(0, 0, 0, 0);
        Paint paint = new Paint();
        paint.setAntiAlias(true);
        paint.setColor(makePressColor());
        canvas.drawCircle(x, y, radius, paint);
        if (radius > getHeight() / rippleSize)
            radius += rippleSpeed;
        if (radius >= getWidth()) {
            x = -1;
            y = -1;
            radius = getHeight() / rippleSize;
            if (onClickListener != null)
                onClickListener.onClick(this);
        }
        return output;
    }

    /**
     * Make a dark color to ripple effect
     *
     * @return
     */
    protected int makePressColor() {
        int r = (this.backgroundColor >> 16) & 0xFF;
        int g = (this.backgroundColor >> 8) & 0xFF;
        int b = (this.backgroundColor >> 0) & 0xFF;
        r = (r - 30 < 0) ? 0 : r - 30;
        g = (g - 30 < 0) ? 0 : g - 30;
        b = (b - 30 < 0) ? 0 : b - 30;
        return Color.rgb(r, g, b);
    }

    @Override
    public void setOnClickListener(OnClickListener l) {
        onClickListener = l;
    }

    // Set color of background
    public void setBackgroundColor(int color) {
        this.backgroundColor = color;
        LayerDrawable layer = (LayerDrawable) getBackground();
        GradientDrawable shape = (GradientDrawable) layer.findDrawableByLayerId(R.id.shape_bacground);
        shape.setColor(backgroundColor);
    }

    abstract public TextView getTextView();

    public void setRippleSpeed(float rippleSpeed) {
        this.rippleSpeed = rippleSpeed;
    }

    public float getRippleSpeed() {
        return this.rippleSpeed;
    }
}