Android簡単サンプル【円描画】

【ソース】
package com.naozary.android.example.simple;

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.view.View;

public class simple extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // setContentView(R.layout.main);
        setContentView(new GraphicsTestView(this));

    }
}

class GraphicsTestView extends View {
    public GraphicsTestView(Context context) {
        super(context);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        Paint paint = new Paint();
        paint.setColor(
                Color.argb(
                        255,        // 透明度
                        255,        // Red
                        255,        // Green
                        0            // Blue
                )
        );
      
        canvas.drawCircle(
                120.5f,    // The x-coordinate of the center of the cirle to be drawn
                100.5f,    // The y-coordinate of the center of the cirle to be drawn
                40.0f,    // The radius of the cirle to be drawn
                paint
        );
      
        paint.setAntiAlias(true);  
        canvas.drawCircle(
                120.5f,    // The x-coordinate of the center of the cirle to be drawn
                200.5f,    // The y-coordinate of the center of the cirle to be drawn
                40.0f,    // The radius of the cirle to be drawn
                paint
        );
    }
}


【実行結果】