CheckBox.java

package com.gc.materialdesign.views;

import java.io.IOException;
import java.io.InputStream;

import com.gc.materialdesign.R;
import com.gc.materialdesign.utils.Utils;

import android.content.Context;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.GradientDrawable;
import android.graphics.drawable.LayerDrawable;
import android.text.AndroidCharacter;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.RelativeLayout;

public class CheckBox extends CustomView{
	
	final static String ANDROIDXML = "http://schemas.android.com/apk/res/android";
	
	int backgroundColor = Color.parseColor("#4CAF50");
	
	Check checkView;
	
	boolean press = false;
	boolean check = false;


	public CheckBox(Context context, AttributeSet attrs) {
		super(context, attrs);
		setAttributes(attrs);
	}
	
	// Set atributtes of XML to View
		protected void setAttributes(AttributeSet attrs){
			
			setBackgroundResource(R.drawable.background_checkbox);
			
			// Set size of view
			setMinimumHeight(Utils.dpToPx(48, getResources()));
			setMinimumWidth(Utils.dpToPx(48, getResources()));
			
			//Set background Color
			// Color by resource
			int bacgroundColor = attrs.getAttributeResourceValue(ANDROIDXML,"background",-1);
			if(bacgroundColor != -1){
				setBackgroundColor(getResources().getColor(bacgroundColor));
			}else{
				// Color by hexadecimal
				String background = attrs.getAttributeValue(ANDROIDXML,"background");
				if(background != null)
					setBackgroundColor(Color.parseColor(background));
			}
			
			boolean check = attrs.getAttributeBooleanValue(MATERIALDESIGNXML,"check", false);
			if(check){
				post(new Runnable() {
					
					@Override
					public void run() {
						setChecked(true);
						setPressed(false);
						changeBackgroundColor(getResources().getColor(android.R.color.transparent));
					}
				});
			}
			
			checkView = new Check(getContext());
			RelativeLayout.LayoutParams params = new LayoutParams(Utils.dpToPx(20, getResources()),Utils.dpToPx(20, getResources()));
			params.addRule(RelativeLayout.CENTER_IN_PARENT, RelativeLayout.TRUE);
			checkView.setLayoutParams(params);
			addView(checkView);
						
		}
		
		
		@Override
		public boolean onTouchEvent(MotionEvent event) {
			isLastTouch = true;
			if (event.getAction() == MotionEvent.ACTION_DOWN) {
					changeBackgroundColor((check)?makePressColor():Color.parseColor("#446D6D6D"));
			} else if (event.getAction() == MotionEvent.ACTION_UP) {
				changeBackgroundColor(getResources().getColor(android.R.color.transparent));
				press = false;
				if((event.getX()<= getWidth() && event.getX() >= 0) && 
						(event.getY()<= getHeight() && event.getY() >= 0)){
					isLastTouch = false;
					check = !check;
					if(check){
						step = 0;
					}
					if(check)
						checkView.changeBackground();
				}
			}
			return true;
		}
		
		@Override
		protected void onDraw(Canvas canvas) {
			super.onDraw(canvas);
			if(press){
				Paint paint = new Paint();
				paint.setAntiAlias(true);
				paint.setColor((check)?makePressColor():Color.parseColor("#446D6D6D"));
				canvas.drawCircle(getWidth()/2, getHeight()/2, getWidth()/2, paint);
			}
			invalidate();
		}
		
		private void changeBackgroundColor(int color){
			LayerDrawable layer = (LayerDrawable) getBackground();
			GradientDrawable shape =  (GradientDrawable) layer.findDrawableByLayerId(R.id.shape_bacground);
			shape.setColor(color);
		}
		
		
		/**
		 * Make a dark color to press 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.argb(70,r, g, b);		
		}
		
		@Override
		public void setBackgroundColor(int color) {
			backgroundColor = color;
		}
		
		public void setChecked(boolean check){
			this.check = check;
			if(check){
				step = 0;
			}
			if(check)
				checkView.changeBackground();	
			
		}

	
	
	
	// Indicate step in check animation
		int step = 0;
	// View that contains checkbox	
	class Check extends View{

		Bitmap sprite;
		public Check(Context context) {
			super(context);			
			setBackgroundResource(R.drawable.background_checkbox_uncheck);
			sprite = BitmapFactory.decodeResource(context.getResources(),
                    R.drawable.sprite_check);
		}
		
		public void changeBackground(){
			if(check){
				setBackgroundResource(R.drawable.background_checkbox_check);
				LayerDrawable layer = (LayerDrawable) getBackground();
				GradientDrawable shape =  (GradientDrawable) layer.findDrawableByLayerId(R.id.shape_bacground);
				shape.setColor(backgroundColor);
			}else{
				setBackgroundResource(R.drawable.background_checkbox_uncheck);
			}
		}
		
		@Override
		protected void onDraw(Canvas canvas) {
			super.onDraw(canvas);
			
			if(check){
				if(step < 11)
					step++;
			}else{
				if(step>=0)
					step--;
				if(step == -1)
					changeBackground();
			}
			int width = sprite.getWidth();
			int height = sprite.getHeight();
			Rect src = new Rect(40*step, 0, (40*step)+40, 40);
			Rect dst = new Rect(0,0,this.getWidth()-2, this.getHeight());
			canvas.drawBitmap(sprite, src, dst, null);
			invalidate();
			
		}
		
		
		
	}
	
	
}