gistfile1.txt

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

/**
 * Created by christianstengel on 16.07.15.
 */
public class ResultCircleView extends View {
    private Paint solidPaint = new Paint();
    private Paint ringPaint = new Paint();
    private boolean isColorSet = false;

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

    private void init() {
        ringPaint.setColor(Color.WHITE);
        ringPaint.setStrokeWidth(2 * getResources().getDisplayMetrics().density);
        ringPaint.setStyle(Paint.Style.STROKE);
        ringPaint.setAntiAlias(true);
        ringPaint.setStrokeCap(Paint.Cap.BUTT);
    }

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

    public ResultCircleView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    public void setColor(int id) {
        isColorSet = true;

        solidPaint.setColor(id);
        solidPaint.setStrokeWidth(6);
        invalidate();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);

        float width = (float) getWidth();
        float height = (float) getHeight();
        float radius = height / 2 - ringPaint.getStrokeWidth() / 2;
        float center_x = width / 2;
        float center_y = height / 2;

        final RectF rect = new RectF();
        rect.set(center_x - radius,
                center_y - radius,
                center_x + radius,
                center_y + radius);


        canvas.drawArc(rect, 0, 360, false, ringPaint);

        if (isColorSet) {
            canvas.drawCircle(width / 2, height / 2, height / 2 - ringPaint.getStrokeWidth() * 3, solidPaint);
        }
    }
}