没事做用自定义view方式写一个星评控件，虽说网上很多这个控件，但是这是自己写的，在这里记录一下。
首先需要自定义属性
<declare-styleable name="Rate">
<!--属性分别是：单个的宽，高，之间的距离，激活的数量，总数量，激活的drawable，没有激活的drawable，是否可以选择数量-->
<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>
初始化代码
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();
}
//如果没有宽高就设置一个默认值
if (rateHeight <= 0){
rateHeight = 80;
}
if (rateWidth <= 0){
rateWidth = 80;
}
if (activeId!=0){
activeBitmap = BitmapFactory.decodeResource(getResources(), activeId);
//如果没有设置宽高时候
if (rateWidth <= 0) {
rateWidth = activeBitmap.getWidth();
}
//把图片压缩到设置的宽高
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的画笔
mPaint.setAntiAlias(true);
activPaint = new Paint();//初始化选中星星的画笔
activPaint.setAntiAlias(true);
activPaint.setColor(Color.YELLOW);
disactivPaint = new Paint();//初始化未选中星星的画笔
disactivPaint.setAntiAlias(true);
disactivPaint.setColor(Color.GRAY);
}
onMeasure方法设置View的宽高，如果设置的每一个星星控件的宽高大于实际view的宽高，就用星星空间的宽高作于view的宽高
@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);
//计算宽
if (widthMode == MeasureSpec.EXACTLY) {
//如果view的宽度小于设置size*星星的宽度，就用size * (int) (padding + rateWidth)做为控件的宽度度
if (widthSize < size * (int) (padding + rateWidth)) {
width = size * (int) (padding + rateWidth);
} else {
width = widthSize;
}
} else {
width = size * (int) (padding + rateWidth)-padding;
}
//计算高
if (heightMode == MeasureSpec.EXACTLY) {
//如果view的高度小于设置星星的高度，就用星星高度做为控件的高度
if (heightSize < rateHeight) {
height = (int) rateHeight + 5;
} else {
height = heightSize;
}
} else {
height = (int) rateHeight + 5;
}
setMeasuredDimension(width, height);
}
onDraw方法中绘制
//开始画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);
}
}
// //开始画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);
}
}
上面用到两个方法drawActivRate和drawDisActivRate，分别是在没有设置活动中的星星和不在活动中星星的图片的时候，绘制在活动和不在活动的默认星星：
/**
* 绘制黄色的五角星（在活动的）
* */
private void drawActivRate(int position,Canvas canvas){
float radius = rateWidth/2;//根據每一個星星的位置繪製園，確定五角星五個點的位置
float angle = 360/5;
float centerX = (rateWidth+padding)*(position+1)-padding-radius;//獲取每一個星星空間的中心位置的X坐標
float centerY =height/2;//獲取每一個星星空間的中心位置的y坐標
Path mPath = new Path();
mPath.moveTo(centerX,centerY-radius);
mPath.lineTo(centerX+(float) Math.cos((angle*2-90)*Math.PI / 180)*radius,centerY+(float)Math.sin((angle*2-90)*Math.PI / 180)*radius);
mPath.lineTo( centerX-(float)Math.sin(angle*Math.PI / 180)*radius,centerY-(float)Math.cos(angle*Math.PI / 180)*radius);
mPath.lineTo( centerX+(float)Math.sin(angle*Math.PI / 180)*radius,centerY-(float)Math.cos(angle*Math.PI / 180)*radius);
mPath.lineTo( centerX-(float)Math.sin((angle*3-180)*Math.PI / 180)*radius,centerY+(float)Math.cos((angle*3-180)*Math.PI / 180)*radius);
// mPath.lineTo(centerX,centerY-radius);
mPath.close();
canvas.drawPath(mPath,activPaint);
}
/**
* 绘制灰色的五角星
* */
private void drawDisActivRate(int position,Canvas canvas){
float radius = rateWidth/2;
float angle = 360/5;
float centerX = (rateWidth+padding)*(position+1)-padding-radius;
float centerY =height/2;
Path mPath = new Path();
mPath.moveTo(centerX,centerY-radius);
mPath.lineTo(centerX+(float) Math.cos((angle*2-90)*Math.PI / 180)*radius,centerY+(float)Math.sin((angle*2-90)*Math.PI / 180)*radius);
mPath.lineTo( centerX-(float)Math.sin(angle*Math.PI / 180)*radius,centerY-(float)Math.cos(angle*Math.PI / 180)*radius);
mPath.lineTo( centerX+(float)Math.sin(angle*Math.PI / 180)*radius,centerY-(float)Math.cos(angle*Math.PI / 180)*radius);
mPath.lineTo( centerX-(float)Math.sin((angle*3-180)*Math.PI / 180)*radius,centerY+(float)Math.cos((angle*3-180)*Math.PI / 180)*radius);
// mPath.lineTo(centerX,centerY-radius);
mPath.close();
canvas.drawPath(mPath,disactivPaint);
}
最后在onTouchEvent方法中处理选中和未选中星星的处理
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!isTouch){//如果不支持觸摸
return false;
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touchX = event.getX();
touchY = event.getY();
for (int i = 0; i < size; i++) {
if (i == 0) {
if (0.0 < touchX && touchX < rateWidth+padding/2) {
activeSize = 1;
}
}else {
if ((rateWidth+padding)*i-padding/2<touchX&&touchX<(rateWidth+padding)*(i+1)-padding/2){
activeSize = i+1;
}
}
}
invalidate();
break;
case MotionEvent.ACTION_UP:
if ( null!= changeListener){
changeListener.change(activeSize);
}
break;
case MotionEvent.ACTION_MOVE:
touchX = event.getX();
touchY = event.getY();
for (int i = 0; i < size; i++) {
if (i == 0) {
if (0.0 < touchX && touchX < rateWidth+padding/2) {
activeSize = 1;
}
}else {
if ((rateWidth+padding)*i-padding/2<touchX&&touchX<(rateWidth+padding)*(i+1)-padding/2){
activeSize = i+1;
}
}
}
invalidate();
if (touchX<=0){
activeSize = 0;
}
break;
}
return true;
}
以上就是自定义view写的星评控件，代码中的注解已经比较详细了，就不多说了，
源码地址
以上所述是小编给大家介绍的android自定义星评空间的实例代码，希望对大家有所帮助！
