Android Button Customizing example

안드로이드에서 Button을 상속하여 커스텀 버튼을 만드는 예

버튼에 터치하면 버튼의 문자열이 적색으로 변경되고 떼면 원래의 색상으로 돌아오는 내용

layout/main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" 
    android:id="@+id/linearLayout1">

	<com.example.androidapp.MyButton
	    android:id="@+id/mybutton"
	    android:layout_width="wrap_content"
	    android:layout_height="wrap_content"
	    android:layout_gravity="center_horizontal"/>

</LinearLayout>

TestActivity.java

package com.example.androidapp;

import android.app.Activity;
import android.os.Bundle;


public class TestActivity extends Activity {

    public void onCreate(Bundle icicle) {
         super.onCreate(icicle);
         setContentView(R.layout.main);
	}
} 

MyButton.java

package com.example.androidapp;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.Button;

public class MyButton extends Button {

	Paint paint;
	
	public MyButton(Context context) {
		super(context);
		init();
	}

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

	private void init() {
		setBackgroundResource(R.drawable.btn_bg);
		paint = new Paint();
		paint.setColor(Color.BLACK);
		paint.setAntiAlias(true);
		paint.setTextScaleX(1f);
		paint.setTextSize(40f);
		paint.setTypeface(Typeface.DEFAULT);
	}
	
	Rect bounds = new Rect(); // 텍스트가 차지하는 영역의 정보를 저장할 때 사용
	@Override
	protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		int w = getWidth();
		int h = getHeight();
		
		String title = "눌러보세요";
		paint.getTextBounds(title, 0, title.length(), bounds);
		
		float textX = ((float)w-bounds.width())/2.0f;  // 버튼상에서 텍스트 시작위치(x)
		float textY = ((float)h-bounds.height())/2.0f; // 버튼상에서 텍스트 시작위치(y)
		canvas.drawText(title, textX, textY+bounds.height(), paint);
	}
	
	@Override
	public boolean onTouchEvent(MotionEvent event) {
		int action = event.getAction();
		switch(action) {
		case MotionEvent.ACTION_DOWN:
			paint.setColor(Color.RED);
			break;
		case MotionEvent.ACTION_UP:
			paint.setColor(Color.BLACK);
			break;
		}
		invalidate();
		return super.onTouchEvent(event);
	}
}