一、概述

Android做屏幕适配有多种方式，比如多套切图、多套dimens参数、百分比布局、动态获取屏幕高宽动态设置控件大小、使用鸿洋大神的antolayout库等方案。本文主要介绍通过AutoUtils来做屏幕适配。

二、优点

AutoUtils优点在于直接通过UI标注的px单位直接设置到布局文件当中，再也不需要去算px和dp的转换。

三、使用步骤

1.创建工具类antoUtils

文章末尾附带源码。

2.初始化UI设计图尺寸

在application的onCreate方法中初始化UI设计稿的大小，比如本文为1920*1080

初始化

3.布局文件

布局文件中按着UI设计图直接引用px单位设置高宽

布局文件

其中imageView需要设置属性android:scaleType="fitXY"且高宽设置为图片的大小(右键属性宽*高)，本地图片路径存放在drawable-nodpi目录下。

4.activity   fragment的onCreat初始化

初始化

5 其他

如果是listview，recycleView 需要在adapter 初始化view中适配。

完成以上步骤可完成屏幕适配，不管分辨率多大的手机都会显示一样的效果。

源码：

package com.Test.utils;

import android.app.Activity;

import android.content.Context;

import android.content.res.Resources;

import android.util.TypedValue;

import android.view.Display;

import android.view.View;

import android.view.ViewGroup;

import android.view.WindowManager;

import android.widget.TextView;

/**

* Android屏幕自动适配工具类

*/

public class AutoUtils {

private static int displayWidth;

private static int displayHeight;

private static int designWidth;

private static int designHeight;

private static boolean inited;

public static double textPixelsRate;

public static void setSize(Context context, boolean hasStatusBar, int designWidth, int designHeight) {

if (context ==null || designWidth <1 || designHeight <1)return;

WindowManager mWManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);

Display display = mWManager.getDefaultDisplay();

int width = display.getWidth();

int height = display.getHeight();

if (hasStatusBar) {

height -=getStatusBarHeight(context);

}

AutoUtils.displayWidth = width;

AutoUtils.displayHeight = height;

AutoUtils.designWidth = designWidth;

AutoUtils.designHeight = designHeight;

double displayDiagonal = Math.sqrt(Math.pow(AutoUtils.displayWidth, 2) + Math.pow(AutoUtils.displayHeight, 2));

double designDiagonal = Math.sqrt(Math.pow(AutoUtils.designWidth, 2) + Math.pow(AutoUtils.designHeight, 2));

AutoUtils.textPixelsRate = displayDiagonal / designDiagonal;

inited =true;

}

public static boolean isInited() {

return inited;

}

public static int getStatusBarHeight(Context context) {

int result =0;

try {

int resourceId = context.getResources().getIdentifier(

"status_bar_height", "dimen", "android");

if (resourceId >0) {

result = context.getResources().getDimensionPixelSize(

resourceId);

}

}catch (Resources.NotFoundException e) {

e.printStackTrace();

}

return result;

}

public static void auto(Activity act) {

if (act ==null ||displayWidth <1 ||displayHeight <1)return;

View view = act.getWindow().getDecorView();

auto(view);

}

public static void auto(View view) {

if (view ==null ||displayWidth <1 ||displayHeight <1)return;

AutoUtils.autoTextSize(view);

AutoUtils.autoSize(view);

AutoUtils.autoPadding(view);

AutoUtils.autoMargin(view);

if (viewinstanceof ViewGroup) {

auto((ViewGroup) view);

}

}

private static void auto(ViewGroup viewGroup) {

int count = viewGroup.getChildCount();

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

View child = viewGroup.getChildAt(i);

if (child !=null) {

auto(child);

}

}

}

public static void autoMargin(View view) {

if (!(view.getLayoutParams()instanceof ViewGroup.MarginLayoutParams))

return;

ViewGroup.MarginLayoutParams lp = (ViewGroup.MarginLayoutParams) view.getLayoutParams();

if (lp ==null)return;

lp.leftMargin =getDisplayWidthValue(lp.leftMargin);

lp.topMargin =getDisplayHeightValue(lp.topMargin);

lp.rightMargin =getDisplayWidthValue(lp.rightMargin);

lp.bottomMargin =getDisplayHeightValue(lp.bottomMargin);

}

public static void autoPadding(View view) {

int l = view.getPaddingLeft();

int t = view.getPaddingTop();

int r = view.getPaddingRight();

int b = view.getPaddingBottom();

l =getDisplayWidthValue(l);

t =getDisplayHeightValue(t);

r =getDisplayWidthValue(r);

b =getDisplayHeightValue(b);

view.setPadding(l, t, r, b);

}

public static void autoSize(View view) {

ViewGroup.LayoutParams lp = view.getLayoutParams();

if (lp ==null)return;

if (lp.width >0) {

lp.width =getDisplayWidthValue(lp.width);

}

if (lp.height >0) {

lp.height =getDisplayHeightValue(lp.height);

}

}

public static void autoTextSize(View view) {

if (viewinstanceof TextView) {

double designPixels = ((TextView) view).getTextSize();

double displayPixels =textPixelsRate * designPixels;

((TextView) view).setIncludeFontPadding(false);

((TextView) view).setTextSize(TypedValue.COMPLEX_UNIT_PX, (float) displayPixels);

}

}

public static int getDisplayWidthValue(int designWidthValue) {

if (designWidthValue <2) {

return designWidthValue;

}

return designWidthValue *displayWidth /designWidth;

}

public static int getDisplayHeightValue(int designHeightValue) {

if (designHeightValue <2) {

return designHeightValue;

}

return designHeightValue *displayHeight /designHeight;

}

}