图1和图2都是宽高比例相等，但是分辨率大小不一样的图片，应该按照比例显示，使用等比例显示控件后，图2的显示效果如图3所示，和图1的显示效果是一致的，解决了宽高比相等或接近但分辨率大小不一样而造成的显示效果不一致的问题
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有限公司版权所有 (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;//图片的宽高比 public static final int RELATIVE_WIDTH = 0;//控件的宽度固定，根据比例求出高度 public static final int RELATIVE_HEIGHT = 1;//控件的高度固定，根据比例求出宽度 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) { //修正宽度的值 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，宽高比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="@mipmap/recommend_05"/> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="分辨率：828x341，宽高比2.428" android:textSize="20sp"/> <ImageView android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#4887EE" android:scaleType="fitXY" android:src="@mipmap/recommend_32"/> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_marginTop="15dp" android:text="按比例显示" android:textSize="20sp"/> <com.google.widget.view.RatioLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#4887EE" google:ratio="2.43"> <ImageView android:layout_width="match_parent" android:layout_height="match_parent" android:src="@mipmap/recommend_32"/> </com.google.widget.view.RatioLayout> </LinearLayout></ScrollView>新闻热点
疑难解答
