解决官方RatingBar无法自由调整宽高的问题
可选则适应宽度或者高度
MyRatingBar.gif
红色背景为自适应后的宽高
在values下创建attrs文件
只设置了常用的
step 步距
rating 当前星值
starts 星星总数
以及可选则适应宽度或者高度 base_of_width_or_height
并添加
<!-- style for MyRatingBar -->
<declare-styleable name="MyRatingBar">
<attr name="base_of_width_or_height" format="enum">
<enum name="width" value="0"/>
<enum name="height" value="1"/>
</attr>
<attr name="step" format="float"/>
<attr name="rating" format="float"/>
<attr name="stars" format="integer"/>
</declare-styleable>
代码部分
public class MyRatingBar extends View {
private Context context;
private int width;//设置高
private int height;//设置高
private Paint paint;
//星星总数
private int starSum=3;
//当前星星数
private float rating=3;
//每步间隔
private float step=0.1f;
//每步距离
private float stepWidth=0;
//每个星星宽度
private int starWidth=0;
//适应宽高度(0:宽度,1:高度)
private int width_height=0;
public MyRatingBar(Context context) {
super(context);
this.context=context;
initPaint();
}
public MyRatingBar(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
init(context,attrs);
this.context=context;
initPaint();
}
public MyRatingBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
this.context=context;
initPaint();
}
private void init(Context context, AttributeSet attrs) {
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.MyRatingBar);
starSum=a.getInt(R.styleable.MyRatingBar_stars,5);
step=a.getFloat(R.styleable.MyRatingBar_step,1f);
width_height=a.getInt(R.styleable.MyRatingBar_base_of_width_or_height, 0);
rating=a.getFloat(R.styleable.MyRatingBar_rating,starSum);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
drawBackgroundStars(canvas);
drawStars(canvas);
}
/**
* 背景
* @param canvas
*/
private void drawBackgroundStars(Canvas canvas) {
Bitmap bitmap=((BitmapDrawable)getResources().getDrawable(R.drawable.icon_star_gray_128)).getBitmap();
for (int i = 0; i < starSum; i++) {
canvas.drawBitmap(bitmap,new Rect(0,0,bitmap.getWidth(),bitmap.getHeight()),new Rect(starWidth*i,0,starWidth*(i+1),starWidth),paint);
}
}
/**
* 星星
* @param canvas
*/
private void drawStars(Canvas canvas) {
Bitmap bitmap=((BitmapDrawable)getResources().getDrawable(R.drawable.icon_star_yellow_128)).getBitmap();
stepWidth=step*starWidth;
int stepNum=(int)(currentX/stepWidth);
rating=round((double)stepNum*step,2);
for (int i = 0; i < stepNum*stepWidth/starWidth; i++) {
int leftX=starWidth*i;
int rightX=starWidth*(i+1);
int x=(int)(stepNum*stepWidth-starWidth*i);
if(currentX>leftX&¤tX<rightX){
canvas.drawBitmap(bitmap,new Rect(0,0,bitmap.getWidth()*x/starWidth,bitmap.getHeight()),new Rect(leftX,0,x+i*starWidth,starWidth),paint);
}else{
if(stepNum*stepWidth/starWidth<i+1){
canvas.drawBitmap(bitmap,new Rect(0,0,bitmap.getWidth()*x/starWidth,bitmap.getHeight()),new Rect(leftX,0,x+i*starWidth,starWidth),paint);
}else {
canvas.drawBitmap(bitmap,new Rect(0,0,bitmap.getWidth(),bitmap.getHeight()),new Rect(leftX,0,rightX,starWidth),paint);
}
}
}
}
/**
* 提供精确的小数位四舍五入处理。
* @param v 需要四舍五入的数字
* @param scale 小数点后保留几位
* @return 四舍五入后的结果
*/
public static float round(double v,int scale){
if(scale<0){
throw new IllegalArgumentException(
"The scale must be a positive integer or zero");
}
BigDecimal b = new BigDecimal(Double.toString(v));
BigDecimal one = new BigDecimal("1");
return (float) b.divide(one,scale,BigDecimal.ROUND_HALF_UP).doubleValue();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
width = getDefaultSize(getMeasuredWidth(), widthMeasureSpec);// 获得控件的宽度
height = getDefaultSize(getMeasuredHeight(), heightMeasureSpec);//获得控件的高度
if(width_height==0){
starWidth=width/starSum;
setMeasuredDimension(width, starWidth);//设置宽和高
}else if(width_height==1){
starWidth=height;
setMeasuredDimension(starWidth*starSum, starWidth);//设置宽和高
}
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
width=w;
height=h;
currentX=width*rating/starSum;
}
/**
* 初始化画笔
*/
private void initPaint() {
paint=new Paint();
paint.setAntiAlias(true);
}
private float currentX=0;
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()){
case MotionEvent.ACTION_DOWN:
currentX=event.getX()+stepWidth/2;
invalidate();
return true;
case MotionEvent.ACTION_MOVE:
if(event.getX()>=0&&event.getX()<=width){
currentX=event.getX()+stepWidth/2;
}else if(event.getX()<0){
currentX=stepWidth/2;
}else if(event.getX()>width){
currentX=width+stepWidth/2;
}
invalidate();
break;
}
return super.onTouchEvent(event);
}
public int getStarSum() {
return starSum;
}
public void setStarSum(int starSum) {
this.starSum = starSum;
invalidate();
}
public float getRating() {
return rating;
}
public void setRating(float rating) {
this.rating = rating;
invalidate();
}
public float getStep() {
return step;
}
public void setStep(float step) {
this.step = step;
invalidate();
}
}
使用：
根布局中添加
xmlns:app="http://schemas.android.com/apk/res-auto"
<com.zjd.myratingbar.MyRatingBar
app:base_of_width_or_height="width"
app:stars="15"
app:step="1"
app:rating="10"
android:layout_gravity="center"
android:layout_width="300dp"
android:layout_height="30dp" />
