列表图片等分

1.新建一个计算图片高度的类

public class NewRatioImageView extends ImageView {
   
   private float mRatio;

   public NewRatioImageView(Context context) {
      super(context);
   }
   
   public NewRatioImageView(Context context, AttributeSet attrs) {
      super(context, attrs);
      
      TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.NewRatioImageView);
      mRatio = a.getFloat(R.styleable.NewRatioImageView_ratio_f, 0.3f);
      a.recycle();
   }

   protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        int width = MeasureSpec.getSize(widthMeasureSpec);
        int height = Math.round(width * mRatio);
        setMeasuredDimension(width,height);
    }
   
   public void setRatio(float ratio) {
      mRatio = ratio;
      requestLayout();
   }
   
}

2.在布局里引用这个类

<LinearLayout
    android:id="@+id/imgContainer"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="5dp"
    android:orientation="horizontal" >
    <com.yaya.mmbang.widget.NewRatioImageView
        android:id="@+id/iv_image0"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:scaleType="centerCrop"
        android:layout_marginRight="5dp"
        app:ratio_f="1"
        android:visibility="invisible" />
    <com.yaya.mmbang.widget.NewRatioImageView
        android:id="@+id/iv_image1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:scaleType="centerCrop"
        android:layout_marginRight="5dp"
        app:ratio_f="1"
        android:visibility="invisible" />
    <com.yaya.mmbang.widget.NewRatioImageView
        android:id="@+id/iv_image2"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:scaleType="centerCrop"
        app:ratio_f="1"
        android:visibility="invisible" />
</LinearLayout>
3.在attr里面定义字段

<declare-styleable name="NewRatioImageView">
    <attr name="ratio_f" format="float" />
</declare-styleable>