本文实例为大家分享了Android实现五星好评效果的具体代码，供大家参考，具体内容如下

这个效果想必大家都非常熟悉，那么Android如何自定义实现这种效果呢？

首先自定义属性：

下面看看具体实现：

/**

* Created by Michael on 2019/11/1.

*/

public class RatingStar extends View {

private int normalId;

private int focusId;

private Bitmap normalImg;

private Bitmap focusImg;

private int number;

private int w1;

private int h1;

private int marginLeft;

private int marginTop;

private int marginBottom;

private int marginRight;

private int height;

private int width;

private int p;

private float w0;

private int i0;

private int mGrade;

public RatingStar(Context context) {

this(context,null);

}

public RatingStar(Context context, @Nullable AttributeSet attrs) {

this(context, attrs,0);

}

public RatingStar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {

super(context, attrs, defStyleAttr);

TypedArray array = context.obtainStyledAttributes(attrs,R.styleable.RatingStar);

normalId = array.getResourceId(R.styleable.RatingStar_starNormal,0);

focusId = array.getResourceId(R.styleable.RatingStar_starFocus,0);

normalImg = BitmapFactory.decodeResource(getResources(), normalId);

focusImg = BitmapFactory.decodeResource(getResources(), focusId);

number = array.getInteger(R.styleable.RatingStar_starNumber,5);

array.recycle();

i0 = -1;

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

w1 = normalImg.getWidth();

h1 = normalImg.getHeight();

//中间间隔

p = 30;

marginTop = 20;

marginBottom = 20;

marginLeft = 20;

marginRight = 20;

height = h1 + marginTop + marginBottom;

width = w1 *number+(number-1)*p +marginLeft+marginRight;

setMeasuredDimension(width, height);

}

@Override

protected void onDraw(Canvas canvas) {

super.onDraw(canvas);

for (int i = 0; i < number; i++) {

if (i <= i0){

canvas.drawBitmap(focusImg,i*w1+marginLeft+i*p,marginTop,null);

mGrade = i+1;

}else{

canvas.drawBitmap(normalImg,i*w1+marginLeft+i*p,marginTop,null);

}

}

Log.e("msg","我被调用了！");

}

@Override

public boolean onTouchEvent(MotionEvent event) {

float x = event.getX();//相对于控件自身的距离

//event.getRawX() 相对于屏幕的距离

switch (event.getAction()){

case MotionEvent.ACTION_DOWN:

case MotionEvent.ACTION_MOVE:

//case MotionEvent.ACTION_UP:

w0 = getWidth()/5;

i0 = (int) (x/w0);

//性能优化，减少onDraw()调用

if (mGrade == i0+1){

return true;

}

invalidate();

break;

}

return true;

}

}

最后看看具体布局中使用：

android:layout_width="wrap_content"

android:layout_height="wrap_content"

app:starNormal="@mipmap/star_normal"

app:starFocus="@mipmap/star_selected"

app:starNumber="5"

/>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。