android使用mvc小例子

package com.wiseandroid.samples.mvcdemo; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Canvas; import android.graphics.LightingColorFilter; import android.graphics.Paint; import android.graphics.PointF; import android.graphics.RectF; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; public final class StarRatingView extends View implements StarRatingModel.Listener { private StarRatingModel model; private StarRatingController controller; private float starSize; private PointF starTopLeft = new PointF(); private RectF starRect = new RectF(); private Bitmap starBitmap; private Paint goldPaint; private Paint grayPaint; public StarRatingView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(); } public StarRatingView(Context context, AttributeSet attrs) { super(context, attrs); init(); } public StarRatingView(Context context) { super(context); init(); } private void init() { starBitmap = BitmapFactory.decodeResource(getContext().getResources(), R.drawable.star); goldPaint = new Paint(); goldPaint.setFilterBitmap(true); grayPaint = new Paint(); grayPaint.setColorFilter(new LightingColorFilter(0xff111122, 0xffcccccc)); grayPaint.setFilterBitmap(true); setModel(new StarRatingModel()); } @Override protected void onDraw(Canvas canvas) { for (int i = 0; i < StarRatingModel.MAX_STARS; ++i) { float starX = starTopLeft.x + i * starSize; float starY = starTopLeft.y; Paint paint = null; if ((i + 1) <= model.getStars()) { // draw a gold star paint = goldPaint; } else { // draw a gray star paint = grayPaint; } starRect.set(starX, starY, starX + starSize, starY + starSize); canvas.drawBitmap(starBitmap, null, starRect, paint); } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int widthMode = MeasureSpec.getMode(widthMeasureSpec); int widthSize = MeasureSpec.getSize(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); if (widthMode != MeasureSpec.EXACTLY) { widthSize = 30 * StarRatingModel.MAX_STARS; } int width = widthSize; int height = heightSize; if (heightMode != MeasureSpec.EXACTLY) { height = width / StarRatingModel.MAX_STARS; } setMeasuredDimension(width, height); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); // We have to fit as much as MAX_STARS into the space we have starSize = Math.min(h, ((float) w) / StarRatingModel.MAX_STARS); starTopLeft.x = (w - starSize * StarRatingModel.MAX_STARS) / 2; starTopLeft.y = (h - starSize) / 2; } public void setModel(StarRatingModel model) { if (model == null) { throw new NullPointerException("model"); } StarRatingModel oldModel = this.model; if (oldModel != null) { oldModel.removeListener(this); } this.model = model; this.model.addListener(this); this.controller = new StarRatingController(this.model); if (oldModel != null) { invalidate(); } } public StarRatingModel getModel() { return model; } @Override public void handleStarRatingChanged(StarRatingModel sender) { invalidate(); } @Override public boolean onTouchEvent(MotionEvent event) { if (event.getAction() == MotionEvent.ACTION_DOWN) { controller.handleTap(event); return true; } else { return super.onTouchEvent(event); } } }