Android携帯ゲームを作って世界に配信してみよう(1) ―― まずは小さなアプリからこつこつ作ってみる

package com.spicysoft.sample;

import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.os.Handler;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;

public class DigitalClockActivity extends Activity {
private Handler handler = new Handler();
private View view;

@Override public void onCreate(Bundle icicle) {
super.onCreate(icicle);
requestWindowFeature(Window.FEATURE_NO_TITLE);
view = new DigitalClockView(this);
setContentView(view);

Timer timer = new Timer(false);
timer.schedule(new TimerTask() {
public void run() {
handler.post(new Runnable() { public void run() { view.invalidate(); }});
}
},0, 1000);
}
}

class DigitalClockView extends View {
private static final int CLOCK = 0;
private static final int CALENDAR　= 1;
private int mode = CLOCK;
final DateFormat FORMAT_CLOCK　　= new SimpleDateFormat("HH:mm:ss");
final DateFormat FORMAT_CALENDAR = new SimpleDateFormat("yyyy/M/d(aaa)");
final Paint paint = new Paint();

public DigitalClockView(Context context) {
super(context);
setFocusable(true);
paint.setTextSize(24);
paint.setTextAlign(Paint.Align.CENTER);
setBackgroundColor(Color.WHITE);
}

@Override protected void onDraw(Canvas canvas) {
final DateFormat format = mode == CLOCK ? FORMAT_CLOCK : FORMAT_CALENDAR;
final String text = format.format(new Date());
canvas.drawText(text,canvas.getWidth()/2,canvas.getHeight()/2,paint);
}

@Override public boolean onTouchEvent (MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
mode = mode == CLOCK ? CALENDAR : CLOCK;
invalidate();
return true;
} else {
return false;
}
}

}