前言
系统中自带的RatingBar使用起来非常不方便，并且无法调整合适大小，于是自定义一个可自己调节星星数量，大小，间距等属性的RatingBar
Demo展示图片：
布局代码如下:
//（layout）activity_main.xml
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="wrap_content"
tools:context="com.test.ratingbar.MainActivity">
<TextView
android:id="@+id/textView"
android:paddingTop="15dp"
android:paddingLeft="15dp"
android:text="星级"
android:textSize="25sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<com.test.ratingbar.view.RatingBar
android:id="@+id/star"
android:paddingTop="15dp"
android:layout_toRightOf="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:paddingLeft="10dp"
app:starCount="5"
app:starEmpty="@drawable/rating_small_empty"
app:starFill="@drawable/rating_small_full"
app:starHalf="@drawable/rating_small_half"
app:starImageSize="35dp"
app:starPadding="1dp"
app:starStep="2.5"
app:stepSize="Half"/>
<!--上面RatingBar属性设置代码是使用的关键 对星星数量，大小，位置，星星样式，间距，默认星级等均做了设置-->
</RelativeLayout>
------------------------------------------------------------------------
//（values）attrs.xml
<resources>
<declare-styleable name="RatingBar">
<!--尺寸值-->
<attr name="starImageSize" format="dimension" />
<!--星星间距-->
<attr name="starPadding" format="dimension" />
<!--星星总数-->
<attr name="starCount" format="integer" />
<!--空白的星星资源文件值-->
<attr name="starEmpty" format="reference" />
<!--满星资源文件值-->
<attr name="starFill" format="reference" />
<!--半星资源文件值-->
<attr name="starHalf" format="reference" />
<!--是否可点击boolean值-->
<attr name="clickable" format="boolean" />
<!--当前进度float值-->
<attr name="starStep" format="float" />
<!--每次进度方式的值，整星还是半星-->
<attr name="stepSize">
<enum name="Half" value="0" />
<enum name="Full" value="1" />
</attr>
</declare-styleable>
</resources>
------------------------------------------------------------------------
//(drawable)ratingbar_bg.xml
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!--主背景-->
<item
android:id="@android:id/background"
android:drawable="@drawable/rating_small_empty"></item>
<!--副进度条-->
<item
android:id="@android:id/secondaryProgress"
android:drawable="@drawable/rating_small_half"></item>
<!--主进度条-->
<item
android:id="@android:id/progress"
android:drawable="@drawable/rating_small_full"></item>
</layer-list>- 1
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自定义RatingBar代码：
//（view）RatingBar
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import com.test.ratingbar.R;
import java.math.BigDecimal;
public class RatingBar extends LinearLayout {
/**
* 是否可点击
*/
private boolean mClickable;
/**
* 星星总数
*/
private int starCount;
/**
* 星星的点击事件
*/
private OnRatingChangeListener onRatingChangeListener;
/**
* 每个星星的大小
*/
private float starImageSize;
/**
* 每个星星的间距
*/
private float starPadding;
/**
* 星星的显示数量，支持小数点
*/
private float starStep;
/**
* 空白的默认星星图片
*/
private Drawable starEmptyDrawable;
/**
* 选中后的星星填充图片
*/
private Drawable starFillDrawable;
/**
* 半颗星的图片
*/
private Drawable starHalfDrawable;
/**
* 每次点击星星所增加的量是整个还是半个
*/
private StepSize stepSize;
/**
* 设置半星的图片资源文件
*/
public void setStarHalfDrawable(Drawable starHalfDrawable) {
this.starHalfDrawable = starHalfDrawable;
}
/**
* 设置满星的图片资源文件
*/
public void setStarFillDrawable(Drawable starFillDrawable) {
this.starFillDrawable = starFillDrawable;
}
/**
* 设置空白和默认的图片资源文件
*/
public void setStarEmptyDrawable(Drawable starEmptyDrawable) {
this.starEmptyDrawable = starEmptyDrawable;
}
/**
* 设置星星是否可以点击操作
*/
public void setClickable(boolean clickable) {
this.mClickable = clickable;
}
/**
* 设置星星点击事件
*/
public void setOnRatingChangeListener(OnRatingChangeListener onRatingChangeListener) {
this.onRatingChangeListener = onRatingChangeListener;
}
/**
* 设置星星的大小
*/
public void setStarImageSize(float starImageSize) {
this.starImageSize = starImageSize;
}
public void setStepSize(StepSize stepSize) {
this.stepSize = stepSize;
}
/**
* 构造函数
* 获取xml中设置的资源文件
*/
public RatingBar(Context context, AttributeSet attrs) {
super(context, attrs);
setOrientation(LinearLayout.HORIZONTAL);
TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RatingBar);
starImageSize = mTypedArray.getDimension(R.styleable.RatingBar_starImageSize, 20);
starPadding = mTypedArray.getDimension(R.styleable.RatingBar_starPadding, 10);
starStep = mTypedArray.getFloat(R.styleable.RatingBar_starStep, 1.0f);
stepSize = StepSize.fromStep(mTypedArray.getInt(R.styleable.RatingBar_stepSize, 1));
starCount = mTypedArray.getInteger(R.styleable.RatingBar_starCount, 5);
starEmptyDrawable = mTypedArray.getDrawable(R.styleable.RatingBar_starEmpty);
starFillDrawable = mTypedArray.getDrawable(R.styleable.RatingBar_starFill);
starHalfDrawable = mTypedArray.getDrawable(R.styleable.RatingBar_starHalf);
mClickable = mTypedArray.getBoolean(R.styleable.RatingBar_clickable, true);
mTypedArray.recycle();
for (int i = 0; i < starCount; ++i) {
final ImageView imageView = getStarImageView();
imageView.setImageDrawable(starEmptyDrawable);
imageView.setOnClickListener(
new OnClickListener() {
@Override
public void onClick(View v) {
if (mClickable) {
//浮点数的整数部分
int fint = (int) starStep;
BigDecimal b1 = new BigDecimal(Float.toString(starStep));
BigDecimal b2 = new BigDecimal(Integer.toString(fint));
//浮点数的小数部分
float fPoint = b1.subtract(b2).floatValue();
if (fPoint == 0) {
fint -= 1;
}
if (indexOfChild(v) > fint) {
setStar(indexOfChild(v) + 1);
} else if (indexOfChild(v) == fint) {
if (stepSize == StepSize.Full) {//如果是满星 就不考虑半颗星了
return;
}
//点击之后默认每次先增加一颗星，再次点击变为半颗星
if (imageView.getDrawable().getCurrent().getConstantState().equals(starHalfDrawable.getConstantState())) {
setStar(indexOfChild(v) + 1);
} else {
setStar(indexOfChild(v) + 0.5f);
}
} else {
setStar(indexOfChild(v) + 1f);
}
}
}
}
);
addView(imageView);
}
setStar(starStep);
}
/**
* 设置每颗星星的参数
*/
private ImageView getStarImageView() {
ImageView imageView = new ImageView(getContext());
LayoutParams layout = new LayoutParams(
Math.round(starImageSize), Math.round(starImageSize));//设置每颗星星在线性布局的大小
layout.setMargins(0, 0, Math.round(starPadding), 0);//设置每颗星星在线性布局的间距
imageView.setLayoutParams(layout);
imageView.setAdjustViewBounds(true);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setImageDrawable(starEmptyDrawable);
imageView.setMinimumWidth(10);
imageView.setMaxHeight(10);
return imageView;
}
/**
* 设置星星的个数
*/
public void setStar(float rating) {
if (onRatingChangeListener != null) {
onRatingChangeListener.onRatingChange(rating);
}
this.starStep = rating;
//浮点数的整数部分
int fint = (int) rating;
BigDecimal b1 = new BigDecimal(Float.toString(rating));
BigDecimal b2 = new BigDecimal(Integer.toString(fint));
//浮点数的小数部分
float fPoint = b1.subtract(b2).floatValue();
//设置选中的星星
for (int i = 0; i < fint; ++i) {
((ImageView) getChildAt(i)).setImageDrawable(starFillDrawable);
}
//设置没有选中的星星
for (int i = fint; i < starCount; i++) {
((ImageView) getChildAt(i)).setImageDrawable(starEmptyDrawable);
}
//小数点默认增加半颗星
if (fPoint > 0) {
((ImageView) getChildAt(fint)).setImageDrawable(starHalfDrawable);
}
}
/**
* 操作星星的点击事件
*/
public interface OnRatingChangeListener {
/**
* 选中的星星的个数
*/
void onRatingChange(float ratingCount);
}
/**
* 星星每次增加的方式整星还是半星，枚举类型
* 类似于View.GONE
*/
public enum StepSize {
Half(0), Full(1);
int step;
StepSize(int step) {
this.step = step;
}
public static StepSize fromStep(int step) {
for (StepSize f : values()) {
if (f.step == step) {
return f;
}
}
throw new IllegalArgumentException();
}
}
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Activity代码如下:
//（activity）MainActivity
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import com.test.ratingbar.view.RatingBar;
public class MainActivity extends AppCompatActivity {
private RatingBar mRatingBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
}
private void initView(){
mRatingBar = (com.test.ratingbar.view.RatingBar) findViewById(R.id.star);
}
private void initData(){
mRatingBar.setClickable(false);
mRatingBar.setStar(3.5f);
}
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Demo下载请移步：http://download.csdn.net/detail/zxc514257857/9799637