Include custom view in XML

The exercise show how to refer custom view in XML.

Create custom view extending View in separated file, MyView.java.

package com.example.androidpaint;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.view.View;

public class MyView extends View {
 
 Bitmap myBitmap;
 int minWidth, minHeight;

 public MyView(Context context) {
  super(context);
  init();
 }

 public MyView(Context context, AttributeSet attrs) {
  super(context, attrs);
  init();
 }

 public MyView(Context context, AttributeSet attrs, int defStyleAttr) {
  super(context, attrs, defStyleAttr);
  init();
 }
 
 private void init(){
  myBitmap = BitmapFactory.decodeResource(
    getResources(), R.drawable.ic_launcher);
  minWidth = myBitmap.getWidth();
  minHeight = myBitmap.getHeight();
 }

 @Override
 protected void onDraw(Canvas canvas) {
  super.onDraw(canvas);
  canvas.drawBitmap(myBitmap, 0, 0, null);
 }

 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  super.onMeasure(widthMeasureSpec, heightMeasureSpec);
  setMeasuredDimension(minWidth, minHeight);
 }
 
}

Include <com.example.androidpaint.MyView> in layout XML. where com.example.androidpaint is our package.

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:autoLink="web"
        android:text="http://android-er.blogspot.com/"
        android:textStyle="bold" />
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="button"/>
    
    <com.example.androidpaint.MyView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <com.example.androidpaint.MyView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="another button"/>

</LinearLayout>