Android自定义星星可滑动评分控件

<?xml version="1.0" encoding="utf-8"?><resources>  <declare-styleable name="StarRatingView">    <!--星星点亮-->    <attr name="stat_on" format="reference"></attr>    <!--星星关闭-->    <attr name="stat_off" format="reference"></attr>    <!--半颗星星-->    <attr name="stat_half" format="reference"></attr>    <!--是否可以点击滑动评分-->    <attr name="ratable" format="boolean"></attr>    <!--星星之间间距-->    <attr name="star_padding" format="dimension"></attr>  </declare-styleable></resources>

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:star="http://schemas.android.com/apk/res/com.le.star"  android:id="@+id/activity_main"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:gravity="center_horizontal">  <com.le.star.StarRatingView    android:id="@+id/srv"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_marginTop="20dp"    star:stat_on="@drawable/frodo_rate_star_small_on_holo_light"    star:stat_off="@drawable/frodo_rate_star_small_off_holo_light"    star:stat_half="@drawable/frodo_rate_star_small_half_holo_light"    star:star_padding="10dp"    star:ratable="false"    >  </com.le.star.StarRatingView>  <Button    android:id="@+id/btn"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_marginTop="20dp"    android:layout_below="@id/srv"    android:text="click"    />  <TextView    android:id="@+id/tv"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_marginTop="50dp"    android:layout_below="@id/btn"    android:textSize="20sp"    />  <com.le.star.StarRatingView    android:id="@+id/srv_ratable"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_below="@id/tv"    android:layout_marginTop="20dp"    star:stat_on="@drawable/frodo_rate_star_big_on_holo_light"    star:stat_off="@drawable/frodo_rate_star_big_off_holo_light"    star:stat_half="@drawable/frodo_rate_star_big_half_holo_light"    star:star_padding="10dp"    star:ratable="true"    >  </com.le.star.StarRatingView></RelativeLayout>

public class StarRatingView extends LinearLayout{  private Drawable on,off,half;  //星星三种图片  private boolean ratable;  //是否点击滑动  private float padding; //星星之间间距  private List<ImageView> list;  //存放五颗星星  private float points[] = new float[11];  //0-10分点的x坐标，index为分数，值为此分数为坐标  private float starWidth;  //设置的星星图片宽度  private float halfStarWidth;  //半个星星宽度  private int paddingLeft;    //控件左padding  private OnRateChangeListener onRateChangeListener;  public StarRatingView(Context context) {    super(context);  }  public StarRatingView(Context context, AttributeSet attrs) {    super(context, attrs);    TypedArray array = context.obtainStyledAttributes(attrs,R.styleable.StarRatingView);    on = array.getDrawable(R.styleable.StarRatingView_stat_on);    off = array.getDrawable(R.styleable.StarRatingView_stat_off);    half = array.getDrawable(R.styleable.StarRatingView_stat_half);    ratable = array.getBoolean(R.styleable.StarRatingView_ratable, false);    halfStarWidth = on.getIntrinsicWidth() / 2;    starWidth = on.getIntrinsicWidth();    padding = array.getDimension(R.styleable.StarRatingView_star_padding, starWidth / 3);    paddingLeft = getPaddingLeft();    list = new ArrayList<>();    ImageView imageView;    //初始化五个星星，并通过points数组把分数与坐标对应起来    for(int i=0;i<5;i++){      imageView = new ImageView(context);      LinearLayout.LayoutParams layoutParams = new LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT);      if(i!=0&&i!=4) {        //设置间距        layoutParams.setMargins((int) padding / 2, 0, (int) padding / 2, 0);        //分数点所在的x坐标        points[i*2] = i*starWidth+i*padding;        points[i*2+1] = points[i*2]+halfStarWidth/2;      }      //第一个左边和最后一个右边不设置间距      if(i==0){        layoutParams.setMargins(0, 0, (int) padding / 2, 0);        points[0] = 0;        points[1] = halfStarWidth;      }      if(i==4){        layoutParams.setMargins((int) padding / 2, 0, 0, 0);        points[i*2] = i*starWidth+i*padding;        points[i*2+1] = points[i*2]+halfStarWidth/2;        points[10] = points[9]+halfStarWidth/2;      }      imageView.setLayoutParams(layoutParams);      imageView.setImageDrawable(off);      list.add(imageView);      addView(list.get(i));    }    setOrientation(LinearLayout.HORIZONTAL);    array.recycle();  }  /**   *根据分数显示星星   * @param rate   */  public void setRate(int rate){    removeAllViews();    int count = rate/2;    boolean isOdd;    if(rate%2==0){      isOdd = false;    }else{      isOdd = true;    }    for(int i=0;i<list.size();i++){      if(i<count){        list.get(i).setImageDrawable(on);      }else{        list.get(i).setImageDrawable(off);      }      if(isOdd&&i==count){        list.get(i).setImageDrawable(half);      }      addView(list.get(i));    }    if(ratable&&onRateChangeListener!=null){      onRateChangeListener.onRateChange(rate);    }  }  public void setOnRateChangeListener(OnRateChangeListener l){    onRateChangeListener = l;  }  @Override  public boolean onTouchEvent(MotionEvent event) {    //设置不可以滑动则不处理事件    if(!ratable){      return super.onTouchEvent(event);    }    setRate(calculateStar(event.getX()));    return true;  }  /**   * 根据坐标计算分数   * @param x   * @return   */  private int calculateStar(float x) {    //减去控件左padding    float realPosition = x-paddingLeft;    for(int i = 0;i<points.length;i++){      if(points[i]>realPosition){        return i;      }    }    //如果循环结束即为右滑超出最大值，返回10分    return 10;  }  /**   * 评分改变的回调   */  public interface OnRateChangeListener{    void onRateChange(int rate);  }}

public class MainActivity extends AppCompatActivity { private int count; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  final StarRatingView srv = (StarRatingView) findViewById(R.id.srv);  findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {   @Override   public void onClick(View v) {    count++;    srv.setRate(count);   }  });  final TextView tv = (TextView) findViewById(R.id.tv);  StarRatingView srv_ratable = (StarRatingView) findViewById(R.id.srv_ratable);  srv_ratable.setOnRateChangeListener(new StarRatingView.OnRateChangeListener() {   @Override   public void onRateChange(int rate) {    tv.setText(rate+"分");   }  }); }}