Button.java

package com.marshalchen.common.uimodule.materialdesign.views;

import com.marshalchen.common.uimodule.R;
import com.marshalchen.common.uimodule.materialdesign.utils.Utils;

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

public abstract class Button extends CustomView {

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

	// Complete in child class
	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();
		setAttributes(attrs);
		beforeBackground = backgroundColor;
	}

	protected void setDefaultProperties() {
		// Min size
		setMinimumHeight(Utils.dpToPx(minHeight, getResources()));
		setMinimumWidth(Utils.dpToPx(minWidth, getResources()));
		// Background shape
		setBackgroundResource(background);
		setBackgroundColor(backgroundColor);
	}

	// Set atributtes of XML to View
	abstract protected void setAttributes(AttributeSet attrs);

	// ### RIPPLE EFFECT ###

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

	@Override
	public boolean onTouchEvent(MotionEvent event) {
		if (isEnabled()) {
			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;
		}
	}

	@Override
	public boolean onInterceptTouchEvent(MotionEvent ev) {
		// super.onInterceptTouchEvent(ev);
		return true;
	}

	public Bitmap makeCircle() {
		Bitmap output = Bitmap.createBitmap(
				getWidth() - Utils.dpToPx(6, getResources()), getHeight()
						- Utils.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;
		if (isEnabled())
			beforeBackground = backgroundColor;
		try {
			LayerDrawable layer = (LayerDrawable) getBackground();
			GradientDrawable shape = (GradientDrawable) layer
					.findDrawableByLayerId(R.id.shape_bacground);
			shape.setColor(backgroundColor);
		} catch (Exception ex) {
			// Without bacground
		}
	}

	abstract public TextView getTextView();

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

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