自定义图片比例适配控件 ProportionImageView

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这个控件实现起来很简单，来源是我的项目经理辉哥他的博客地址地址交流群 546270670 欢迎大家

直接上代码

/** *  * ============================================================ *  * project name : TiantianFangFu *  * copyright ZENG HUI (c) 2015 *  * author : HUI *  * version : 1.0 *  * date created : On June, 2015 *  * description : 自己设置view宽高比（一般会知道宽）, 不需要去适配了 *  * revision history : *  * ============================================================ *  */public class ProportionImageView extends ImageView {// 用float可能更好private float mWidthPro;private float mHeightPro;public ProportionImageView(Context context) {this(context, null);}public ProportionImageView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public ProportionImageView(Context context, AttributeSet attrs,   int defStyleAttr) {super(context, attrs, defStyleAttr);initAttribute(context, attrs);}private void initAttribute(Context context, AttributeSet attrs) {TypedArray array = context.obtainStyledAttributes(attrs,R.styleable.ProportionImageView);mWidthPro = array.getFloat(R.styleable.ProportionImageView_width_proportion, mWidthPro);mHeightPro = array.getFloat(R.styleable.ProportionImageView_height_proportion, mHeightPro);array.recycle();}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {// 先测量一下super.onMeasure(widthMeasureSpec, heightMeasureSpec);// 用户没有设置宽高比就不处理if (mWidthPro == 0 || mHeightPro == 0) {return;}// 拿到宽int width = getMeasuredWidth();int height = (int) (width * (mHeightPro / mWidthPro));// 宽和高按比例设置setMeasuredDimension(width, height);}}

<declare-styleable name="ProportionImageView">

        

        <attr name="width_proportion" format="float" />

        

        <attr name="height_proportion" format="float" />

    </declare-styleable>

使用

        <com.hc.baibianjiajia.ui.ProportionImageView            android:id="@+id/note_iv"            android:layout_width="match_parent"            android:layout_height="wrap_content"            hui:width_proportion="2"            hui:height_proportion="1"            android:scaleType="centerCrop"            android:layout_marginBottom="10dp" />

 hui:width_proportion="2"   宽 2 hui:height_proportion="1"   高 1

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