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大家做android的就知道android自带的控件很丑，所以很多控件都需要自定义，例如这里说道的RatingBar控件，自带的奇丑无比，那么下面看看怎么利用自定义控件代替RatingBar控件吧，直接上个工具类，可以直接粘贴使用
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;
/**
* Created by 唐小糖 on 2017/1/13.
* 自定义 星星控件，空心实心的五角心
*/
public class StarBar extends View {
private int starDistance = 0; //星星间距
private int starCount = 5; //星星个数
private int starSize; //星星高度大小，星星一般正方形，宽度等于高度
private float starMark = 0.0F; //评分星星
private Bitmap starFillBitmap; //亮星星
private Drawable starEmptyDrawable; //暗星星
private OnStarChangeListener onStarChangeListener;//监听星星变化接口
private Paint paint; //绘制星星画笔
private boolean integerMark = false;
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组件
*
* @param context 当前视图
* @param attrs 参数
*/
private void init(Context context, AttributeSet attrs){
setClickable(true);
TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RatingBar);
this.starDistance = (int) mTypedArray.getDimension(R.styleable.RatingBar_starDistance, 0);
this.starSize = (int) mTypedArray.getDimension(R.styleable.RatingBar_starSize, 20);
this.starCount = mTypedArray.getInteger(R.styleable.RatingBar_starCount, 5);
this.starEmptyDrawable = mTypedArray.getDrawable(R.styleable.RatingBar_starEmpty);
this.starFillBitmap = drawableToBitmap(mTypedArray.getDrawable(R.styleable.RatingBar_starFill));
mTypedArray.recycle();
paint = new Paint();
paint.setAntiAlias(true);
paint.setShader(new BitmapShader(starFillBitmap, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
}
/**
* 设置是否需要整数评分
* @param integerMark 星星是否为整数还是小数
*/
public void setIntegerMark(boolean integerMark){
this.integerMark = integerMark;
}
/**
* 设置显示的星星的分数
*
* @param mark 分数
*/
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); //调用监听接口
}
invalidate();
}
/**
* 获取显示星星的数目
*
* @return starMark 星星的个数
*/
public float getStarMark(){
return starMark;
}
/**
* 定义星星点击的监听接口 点击星星点亮或者空心
*/
public interface OnStarChangeListener {
void onStarChange(float mark);
}
/**
* 设置监听
* @param onStarChangeListener 点击星星图标后触发
*/
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);
}
//绘制星星
@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);
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
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转bitmap
*
* @param drawable
* @return bitmap
*/
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;
}
} <declare-styleable name="RatingBar">
<!--星星间距-->
<attr name="starDistance" format="dimension" />
<!--星星大小-->
<attr name="starSize" format="dimension" />
<!--星星个数-->
<attr name="starCount" format="integer" />
<!--星星空图-->
<attr name="starEmpty" format="reference" />
<!--星星满图-->
<attr name="starFill" format="reference" />
</declare-styleable> <自定义布局路径
android:id="@+id/starBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_vertical"
android:layout_marginLeft="@dimen/x20"
ratingbar:starCount="5"
ratingbar:starDistance="@dimen/x10"
ratingbar:starEmpty="@mipmap/star_empty"
ratingbar:starFill="@mipmap/star_full"
ratingbar:starSize="@dimen/x30" />
xmlns:app="http://schemas.android.com/apk/res-auto"