沒事做用自定義view方式寫一個星評控件，雖說網上很多這個控件，但是這是自己寫的，在這里記錄一下。
首先需要自定義屬性
<declare-styleable name="Rate"> <!--屬性分別是：單個的寬，高，之間的距離，激活的數量，總數量，激活的drawable，沒有激活的drawable，是否可以選擇數量--> <attr name="custom_rate_width" format="dimension"/> <attr name="custom_rate_height" format="dimension"/> <attr name="custom_rate_padding" format="dimension"/> <attr name="custom_rate_active_size" format="integer"/> <attr name="custom_rate_size" format="integer"/> <attr name="custom_rate_active_drawable" format="reference"/> <attr name="custom_rate_disactive_drawable" format="reference"/> <attr name="custom_rate_touch" format="boolean"/> </declare-styleable>
初始化代碼
protected void init(Context context, AttributeSet attrs) { TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.Rate); int activeId = 0; int disactiveId = 0; if (array != null) { size = array.getInt(R.styleable.Rate_custom_rate_size, 5); activeSize = array.getInt(R.styleable.Rate_custom_rate_active_size, 3); rateWidth = array.getDimensionPixelOffset(R.styleable.Rate_custom_rate_width, 0); rateHeight = array.getDimensionPixelOffset(R.styleable.Rate_custom_rate_height, 0); activeId = array.getResourceId(R.styleable.Rate_custom_rate_active_drawable, 0); disactiveId = array.getResourceId(R.styleable.Rate_custom_rate_disactive_drawable, 0); padding = array.getDimensionPixelOffset(R.styleable.Rate_custom_rate_padding, 0); isTouch = array.getBoolean(R.styleable.Rate_custom_rate_touch, false); array.recycle(); } //如果沒有寬高就設置一個默認值 if (rateHeight <= 0){ rateHeight = 80; } if (rateWidth <= 0){ rateWidth = 80; } if (activeId!=0){ activeBitmap = BitmapFactory.decodeResource(getResources(), activeId); //如果沒有設置寬高時候 if (rateWidth <= 0) { rateWidth = activeBitmap.getWidth(); } //把圖片壓縮到設置的寬高 activeBitmap = Bitmap.createScaledBitmap(activeBitmap, (int) rateWidth, (int) rateHeight, false); } if (disactiveId != 0){ disactiveBitmap = BitmapFactory.decodeResource(getResources(), disactiveId); if (rateHeight <= 0) { rateHeight = activeBitmap.getHeight(); } disactiveBitmap = Bitmap.createScaledBitmap(disactiveBitmap, (int) rateWidth, (int) rateHeight, false); } mPaint = new Paint();//初始化bitmap的畫筆 mPaint.setAntiAlias(true); activPaint = new Paint();//初始化選中星星的畫筆 activPaint.setAntiAlias(true); activPaint.setColor(Color.YELLOW); disactivPaint = new Paint();//初始化未選中星星的畫筆 disactivPaint.setAntiAlias(true); disactivPaint.setColor(Color.GRAY); }onMeasure方法設置View的寬高，如果設置的每一個星星控件的寬高大于實際view的寬高，就用星星空間的寬高作于view的寬高
@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); //計算寬 if (widthMode == MeasureSpec.EXACTLY) { //如果view的寬度小于設置size*星星的寬度，就用size * (int) (padding + rateWidth)做為控件的寬度度 if (widthSize < size * (int) (padding + rateWidth)) { width = size * (int) (padding + rateWidth); } else { width = widthSize; } } else { width = size * (int) (padding + rateWidth)-padding; } //計算高 if (heightMode == MeasureSpec.EXACTLY) { //如果view的高度小于設置星星的高度，就用星星高度做為控件的高度 if (heightSize < rateHeight) { height = (int) rateHeight + 5; } else { height = heightSize; } } else { height = (int) rateHeight + 5; } setMeasuredDimension(width, height); }onDraw方法中繪制
//開始畫active for (int i = 0; i < activeSize; i++) { if (activeBitmap != null){ if (i == 0) { canvas.drawBitmap(activeBitmap, rateWidth * i, (height - rateHeight) / 2, mPaint); } else { canvas.drawBitmap(activeBitmap, (rateWidth + padding) * i, (height - rateHeight) / 2, mPaint); } }else { drawActivRate(i,canvas); } }// //開始畫disactive for (int i = activeSize; i < size; i++) { if (disactiveBitmap != null){ if (i == 0) { canvas.drawBitmap(disactiveBitmap, rateWidth * i, (height - rateHeight) / 2, mPaint); } else { canvas.drawBitmap(disactiveBitmap, (rateWidth + padding) * i, (height - rateHeight) / 2, mPaint); } }else { drawDisActivRate(i,canvas); } }上面用到兩個方法drawActivRate和drawDisActivRate，分別是在沒有設置活動中的星星和不在活動中星星的圖片的時候，繪制在活動和不在活動的默認星星：
/** * 繪制黃色的五角星（在活動的） * */ private void drawActivRate(int position,Canvas canvas){ float radius = rateWidth/2;//根
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