星星评价控件android开发_android自定义星级评分控件，可实现只显示实心星星
話不多說(shuō)，上圖
近日app需求弄一個(gè)等級(jí)展示，看了下UI圖，只顯示實(shí)星(點(diǎn)亮的星星).如圖
但是網(wǎng)上關(guān)于星級(jí)評(píng)分的例子大多這樣
也展示虛心星星
通過(guò)自定義Viewpackage com.starsbar;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
public class StarBar extends View {
private int starDistance = 0; //星星間距
private int starCount = 5; //星星個(gè)數(shù)
private int starSize; //星星高度大小，星星一般正方形，寬度等于高度
private float starMark = 0.0F; //評(píng)分星星
private Bitmap starFillBitmap; //亮星星
private Drawable starEmptyDrawable; //暗星星
private OnStarChangeListener onStarChangeListener;//監(jiān)聽(tīng)星星變化接口
private Paint paint; //繪制星星畫(huà)筆
private boolean integerMark = false;
private boolean clickAble = true;
public StarBar(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
}
public StarBar(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs);
}
/**
* 初始化UI組件
*/
private void init(Context context, AttributeSet attrs) {
setClickable(true);
TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.StarBar);
this.starDistance = (int) mTypedArray.getDimension(R.styleable.StarBar_starDistance, 0);
this.starSize = (int) mTypedArray.getDimension(R.styleable.StarBar_starSize, 20);
this.starCount = mTypedArray.getInteger(R.styleable.StarBar_starCount, 5);
this.starEmptyDrawable = mTypedArray.getDrawable(R.styleable.StarBar_starEmpty);
this.starFillBitmap = drawableToBitmap(mTypedArray.getDrawable(R.styleable.StarBar_starFill));
mTypedArray.recycle();
paint = new Paint();
paint.setAntiAlias(true);
paint.setShader(new BitmapShader(starFillBitmap, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
}
/**
* 設(shè)置星星是否可以點(diǎn)擊和滑動(dòng)改變
*/
public void setClickAble(boolean clickAble) {
this.clickAble = clickAble;
}
/**
* 設(shè)置是否需要整數(shù)評(píng)分
*
* @param integerMark
*/
public void setIntegerMark(boolean integerMark) {
this.integerMark = integerMark;
}
/**
* 設(shè)置顯示的星星的分?jǐn)?shù)
*
* @param mark
*/
public void setStarMark(float mark) {
if (integerMark) {
starMark = (int) Math.ceil(mark);
} else {
starMark = Math.round(mark * 10) * 1.0f / 10;
}
if (this.onStarChangeListener != null) {
this.onStarChangeListener.onStarChange(starMark); //調(diào)用監(jiān)聽(tīng)接口
}
invalidate();
}
/**
* 獲取顯示星星的數(shù)目
*
* @return starMark
*/
public float getStarMark() {
return starMark;
}
/**
* 定義星星點(diǎn)擊的監(jiān)聽(tīng)接口
*/
public interface OnStarChangeListener {
void onStarChange(float mark);
}
/**
* 設(shè)置監(jiān)聽(tīng)
*
* @param onStarChangeListener
*/
public void setOnStarChangeListener(OnStarChangeListener onStarChangeListener) {
this.onStarChangeListener = onStarChangeListener;
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
setMeasuredDimension(starSize * starCount + starDistance * (starCount - 1), starSize);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (starFillBitmap == null || starEmptyDrawable == null) {
return;
}
for (int i = 0; i < starCount; i++) {
starEmptyDrawable.setBounds((starDistance + starSize) * i, 0, (starDistance + starSize) * i + starSize, starSize);
starEmptyDrawable.draw(canvas);
}
if (starMark > 1) {
canvas.drawRect(0, 0, starSize, starSize, paint);
if (starMark - (int) (starMark) == 0) {
for (int i = 1; i < starMark; i++) {
canvas.translate(starDistance + starSize, 0);
canvas.drawRect(0, 0, starSize, starSize, paint);
}
} else {
for (int i = 1; i < starMark - 1; i++) {
canvas.translate(starDistance + starSize, 0);
canvas.drawRect(0, 0, starSize, starSize, paint);
}
canvas.translate(starDistance + starSize, 0);
canvas.drawRect(0, 0, starSize * (Math.round((starMark - (int) (starMark)) * 10) * 1.0f / 10), starSize, paint);
}
} else {
canvas.drawRect(0, 0, starSize * starMark, starSize, paint);
}
}
/**
* 設(shè)置星星總數(shù)
*/
public void setStarCount(int count){
starCount = count;
}
/**
* 設(shè)置星星亮的顆數(shù)
*/
public void setRating(int rating){
if (integerMark) {
starMark = (int) Math.ceil(rating);
} else {
starMark = Math.round(rating * 10) * 1.0f / 10;
}
if (this.onStarChangeListener != null) {
this.onStarChangeListener.onStarChange(starMark); //調(diào)用監(jiān)聽(tīng)接口
}
invalidate();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if (clickAble) {
int x = (int) event.getX();
if (x < 0) x = 0;
if (x > getMeasuredWidth()) x = getMeasuredWidth();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN: {
setStarMark(x * 1.0f / (getMeasuredWidth() * 1.0f / starCount));
break;
}
case MotionEvent.ACTION_MOVE: {
setStarMark(x * 1.0f / (getMeasuredWidth() * 1.0f / starCount));
break;
}
case MotionEvent.ACTION_UP: {
break;
}
}
invalidate();
}
return super.onTouchEvent(event);
}
/**
* drawable轉(zhuǎn)bitmap
*
* @param drawable
* @return
*/
private Bitmap drawableToBitmap(Drawable drawable) {
if (drawable == null) return null;
Bitmap bitmap = Bitmap.createBitmap(starSize, starSize, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
drawable.setBounds(0, 0, starSize, starSize);
drawable.draw(canvas);
return bitmap;
}
}
解決方案，為了只顯示實(shí)心數(shù)，加了2個(gè)方法，注意：/**
* 設(shè)置星星總數(shù)
*/
public void setStarCount(int count){
starCount = count;
}
/**
* 設(shè)置星星亮的顆數(shù)
*/
public void setRating(int rating){
if (integerMark) {
starMark = (int) Math.ceil(rating);
} else {
starMark = Math.round(rating * 10) * 1.0f / 10;
}
if (this.onStarChangeListener != null) {
this.onStarChangeListener.onStarChange(starMark); //調(diào)用監(jiān)聽(tīng)接口
}
invalidate();
}
在activity中配合使用即可實(shí)現(xiàn)上述需求：//不可選擇的starBar，只做顯示用 不顯示空心
starBar2=findViewById(R.id.starBar2);
starBar2.setClickAble(false);
starBar2.setStarCount(3);
starBar2.setRating(3);
另介紹另外一種星級(jí)評(píng)分 YStarView
總結(jié)
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