圖1和圖2都是寬高比例相等，但是分辨率大小不一樣的圖片，應該按照比例顯示，使用等比例顯示控件后，圖2的顯示效果如圖3所示，和圖1的顯示效果是一致的，解決了寬高比相等或接近但分辨率大小不一樣而造成的顯示效果不一致的問題
package com.google.widget.view;import android.content.Context;import android.content.res.TypedArray;import android.util.AttributeSet;import android.widget.FrameLayout;import com.google.widget.R;/** * ============================================================ * Copyright：Google有限公司版權所有 (c) 2017 * Author： AllenIverson * Email： 815712739@QQ.com * GitHub： https://github.com/JackChen1999 * 博客： http://blog.csdn.net/axi295309066 * 微博： AndroidDeveloper * <p> * PRoject_Name：Widgets * Package_Name：com.google.widget * Version：1.0 * time：2016/2/15 14:09 * des ： * gitVersion：$Rev$ * updateAuthor：$Author$ * updateDate：$Date$ * updateDes：${TODO} * ============================================================ **/public class RatioLayout extends FrameLayout { private float mPicRatio;//圖片的寬高比 public static final int RELATIVE_WIDTH = 0;//控件的寬度固定，根據比例求出高度 public static final int RELATIVE_HEIGHT = 1;//控件的高度固定，根據比例求出寬度 private int mRelative = RELATIVE_WIDTH; public RatioLayout(Context context) { this(context, null); } public RatioLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public RatioLayout(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initView(context, attrs); } private void initView(Context context, AttributeSet attrs) { TypedArray array = context.obtainStyledAttributes(attrs, R.styleable.RatioLayout); for (int i = 0; i < array.getIndexCount(); i++) { switch (i) { case R.styleable.RatioLayout_ratio: mPicRatio = array.getFloat(i, 2.43f); break; case R.styleable.RatioLayout_relative: mRelative = array.getInt(i, 0); break; } } array.recycle(); } public void setPicRatio(float picRatio) { mPicRatio = picRatio; } public void setRelative(int relative) { mRelative = relative; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int widthMode = MeasureSpec.getMode(widthMeasureSpec); int heightMode = MeasureSpec.getMode(heightMeasureSpec); int widthSize = MeasureSpec.getSize(widthMeasureSpec); int heightSize = MeasureSpec.getSize(heightMeasureSpec); int childWidth = widthSize - getPaddingLeft() - getPaddingRight(); int childHeight = heightSize - getPaddingBottom() - getPaddingTop(); if (widthMode == MeasureSpec.EXACTLY && mPicRatio != 0 && mRelative == RELATIVE_WIDTH) { //修正高度的值 childHeight = (int) (childWidth / mPicRatio + 0.5f); } else if (heightMode == MeasureSpec.EXACTLY && mPicRatio != 0 && mRelative == RELATIVE_HEIGHT) { //修正寬度的值 childWidth = (int) (childHeight * mPicRatio + 0.5f); } int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidth, MeasureSpec.EXACTLY); int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(childHeight, MeasureSpec.EXACTLY); measureChildren(childWidthMeasureSpec, childHeightMeasureSpec); setMeasuredDimension(childWidth + getPaddingLeft() + getPaddingRight(), childHeight + getPaddingBottom() + getPaddingTop()); /* widthMeasureSpec = MeasureSpec.makeMeasureSpec(childWidth + getPaddingLeft() + getPaddingRight(), MeasureSpec.EXACTLY); heightMeasureSpec = MeasureSpec.makeMeasureSpec(childHeight + getPaddingBottom() + getPaddingTop(), MeasureSpec.EXACTLY); super.measure(widthMeasureSpec, heightMeasureSpec);*/ }}<?xml version="1.0" encoding="utf-8"?><ScrollView xmlns:android="http://schemas.android.com/apk/res/android" xmlns:google="http://schemas.android.com/apk/res-auto" android:layout_width="match_parent" android:layout_height="match_parent"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="10dp" android:orientation="vertical"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="分辨率：444x183，寬高比2.426" android:textSize="20sp"/> <ImageView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginBottom="15dp" android:background="#4887EE" android:scaleType="fitXY" android:src="@m新聞熱點
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