本文介绍Andbase框架中的AbViewUtil工具类，通过代码示例详细解释如何利用该工具进行屏幕适配，并提供了一种简便的方法来实现不同分辨率设备上的界面一致性。
Andbase框架中有个AbViewUtil，经测试，确实可以实现屏幕适配。
下面是该文件源码：
这里写代码片/*
* Copyright (C) 2012 www.amsoft.cn
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.keqiang.borche.widget.andbase.utils;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.graphics.Paint;
import android.os.Build.VERSION;
import android.text.TextPaint;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.View;
import android.view.View.MeasureSpec;
import android.view.ViewGroup;
import android.view.ViewGroup.MarginLayoutParams;
import android.view.ViewParent;
import android.widget.AbsListView;
import android.widget.GridView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import com.keqiang.borche.widget.andbase.view.AbListViewFooter;
import com.keqiang.borche.widget.andbase.view.AbListViewHeader;
// TODO: Auto-generated Javadoc
/**
* © 2012 amsoft.cn
* 名称：AbViewUtil.java
* 描述：View工具类.
*
* @author 还如一梦中
* @version v1.0
* @date：2013-01-17 下午11:52:13
*/
public class AbViewUtil {
/**
* 无效值
*/
public static final int INVALID = Integer.MIN_VALUE;
/**
* 描述：重置AbsListView的高度. item 的最外层布局要用
* RelativeLayout,如果计算的不准，就为RelativeLayout指定一个高度
*
* @param absListView
* the abs list view
* @param lineNumber
* 每行几个 ListView一行一个item
* @param verticalSpace
* the vertical space
*/
public static void setAbsListViewHeight(AbsListView absListView,
int lineNumber, int verticalSpace) {
int totalHeight = getAbsListViewHeight(absListView, lineNumber,
verticalSpace);
ViewGroup.LayoutParams params = absListView.getLayoutParams();
params.height = totalHeight;
((MarginLayoutParams) params).setMargins(0, 0, 0, 0);
absListView.setLayoutParams(params);
}
/**
* 描述：获取AbsListView的高度.
*
* @param absListView the abs list view
* @param lineNumber 每行几个 ListView一行一个item
* @param verticalSpace the vertical space
* @return the abs list view height
*/
public static int getAbsListViewHeight(AbsListView absListView,
int lineNumber, int verticalSpace) {
int totalHeight = 0;
int w = MeasureSpec.makeMeasureSpec(0,
MeasureSpec.UNSPECIFIED);
int h = MeasureSpec.makeMeasureSpec(0,
MeasureSpec.UNSPECIFIED);
absListView.measure(w, h);
ListAdapter mListAdapter = absListView.getAdapter();
if (mListAdapter == null) {
return totalHeight;
}
int count = mListAdapter.getCount();
if (absListView instanceof ListView) {
for (int i = 0; i < count; i++) {
View listItem = mListAdapter.getView(i, null, absListView);
listItem.measure(w, h);
totalHeight += listItem.getMeasuredHeight();
}
if (count == 0) {
totalHeight = verticalSpace;
} else {
totalHeight = totalHeight
+ (((ListView) absListView).getDividerHeight() * (count - 1));
}
} else if (absListView instanceof GridView) {
int remain = count % lineNumber;
if (remain > 0) {
remain = 1;
}
if (mListAdapter.getCount() == 0) {
totalHeight = verticalSpace;
} else {
View listItem = mListAdapter.getView(0, null, absListView);
listItem.measure(w, h);
int line = count / lineNumber + remain;
totalHeight = line * listItem.getMeasuredHeight() + (line - 1)
* verticalSpace;
}
}
return totalHeight;
}
/**
* 测量这个view
* 最后通过getMeasuredWidth()获取宽度和高度.
* @param view 要测量的view
* @return 测量过的view
*/
public static void measureView(View view) {
ViewGroup.LayoutParams p = view.getLayoutParams();
if (p == null) {
p = new ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.WRAP_CONTENT);
}
int childWidthSpec = ViewGroup.getChildMeasureSpec(0, 0 + 0, p.width);
int lpHeight = p.height;
int childHeightSpec;
if (lpHeight > 0) {
childHeightSpec = MeasureSpec.makeMeasureSpec(lpHeight,
MeasureSpec.EXACTLY);
} else {
childHeightSpec = MeasureSpec.makeMeasureSpec(0,
MeasureSpec.UNSPECIFIED);
}
view.measure(childWidthSpec, childHeightSpec);
}
/**
* 获得这个View的宽度
* 测量这个view，最后通过getMeasuredWidth()获取宽度.
* @param view 要测量的view
* @return 测量过的view的宽度
*/
public static int getViewWidth(View view) {
measureView(view);
return view.getMeasuredWidth();
}
/**
* 获得这个View的高度
* 测量这个view，最后通过getMeasuredHeight()获取高度.
* @param view 要测量的view
* @return 测量过的view的高度
*/
public static int getViewHeight(View view) {
measureView(view);
return view.getMeasuredHeight();
}
/**
* 从父亲布局中移除自己
* @param v
*/
public static void removeSelfFromParent(View v) {
ViewParent parent = v.getParent();
if(parent != null){
if(parent instanceof ViewGroup){
((ViewGroup)parent).removeView(v);
}
}
}
/**
* 描述：dip转换为px.
*
* @param context the context
* @param dipValue the dip value
* @return px值
*/
public static float dip2px(Context context, float dipValue) {
DisplayMetrics mDisplayMetrics = AbAppUtil.getDisplayMetrics(context);
return applyDimension(TypedValue.COMPLEX_UNIT_DIP,dipValue,mDisplayMetrics);
}
/**
* 描述：px转换为dip.
*
* @param context the context
* @param pxValue the px value
* @return dip值
*/
public static float px2dip(Context context, float pxValue) {
DisplayMetrics mDisplayMetrics = AbAppUtil.getDisplayMetrics(context);
return pxValue / mDisplayMetrics.density;
}
/**
* 描述：sp转换为px.
*
* @param context the context
* @param spValue the sp value
* @return sp值
*/
public static float sp2px(Context context, float spValue) {
DisplayMetrics mDisplayMetrics = AbAppUtil.getDisplayMetrics(context);
return applyDimension(TypedValue.COMPLEX_UNIT_SP,spValue,mDisplayMetrics);
}
/**
* 描述：px转换为sp.
*
* @param context the context
* @param pxValue the sp value
* @return sp值
*/
public static float px2sp(Context context, float pxValue) {
DisplayMetrics mDisplayMetrics = AbAppUtil.getDisplayMetrics(context);
return pxValue / mDisplayMetrics.scaledDensity;
}
/**
* 描述：根据屏幕大小缩放.
*
* @param context the context
* @param value the px value
* @return the int
*/
public static int scaleValue(Context context, float value) {
DisplayMetrics mDisplayMetrics = AbAppUtil.getDisplayMetrics(context);
//为了兼容尺寸小密度大的情况
int width = mDisplayMetrics.widthPixels;
int height = mDisplayMetrics.heightPixels;
//解决横屏比例问题
if(width > height){
width = mDisplayMetrics.heightPixels;
height = mDisplayMetrics.widthPixels;
}
if(mDisplayMetrics.scaledDensity >= AbAppConfig.UI_DENSITY){
//密度
if(width > AbAppConfig.UI_WIDTH){
value = value*(1.3f - 1.0f/mDisplayMetrics.scaledDensity);
}else if(width < AbAppConfig.UI_WIDTH){
value = value*(1.0f - 1.0f/mDisplayMetrics.scaledDensity);
}
}else{
//密度小屏幕大:缩小比例
float offset = AbAppConfig.UI_DENSITY-mDisplayMetrics.scaledDensity;
if(offset > 0.5f){
value = value * 0.9f;
}else{
value = value * 0.95f;
}
}
return scale(mDisplayMetrics.widthPixels,mDisplayMetrics.heightPixels, value);
}
/**
* 描述：根据屏幕大小缩放文本.
*
* @param context the context
* @param value the px value
* @return the int
*/
public static int scaleTextValue(Context context, float value) {
return scaleValue(context, value);
}
/**
* 描述：根据屏幕大小缩放.
*
* @param displayWidth the display width
* @param displayHeight the display height
* @param pxValue the px value
* @return the int
*/
public static int scale(int displayWidth, int displayHeight, float pxValue) {
if(pxValue == 0 ){
return 0;
}
float scale = 1;
try {
int width = displayWidth;
int height = displayHeight;
//解决横屏比例问题
if(width > height){
width = displayHeight;
height = displayWidth;
}
float scaleWidth = (float) width / AbAppConfig.UI_WIDTH;
float scaleHeight = (float) height / AbAppConfig.UI_HEIGHT;
scale = Math.min(scaleWidth, scaleHeight);
} catch (Exception e) {
}
return Math.round(pxValue * scale + 0.5f);
}
/**
* TypedValue官方源码中的算法，任意单位转换为PX单位
* @param unit TypedValue.COMPLEX_UNIT_DIP
* @param value 对应单位的值
* @param metrics 密度
* @return px值
*/
public static float applyDimension(int unit, float value,
DisplayMetrics metrics){
switch (unit) {
case TypedValue.COMPLEX_UNIT_PX:
return value;
case TypedValue.COMPLEX_UNIT_DIP:
return value * metrics.density;
case TypedValue.COMPLEX_UNIT_SP:
return value * metrics.scaledDensity;
case TypedValue.COMPLEX_UNIT_PT:
return value * metrics.xdpi * (1.0f/72);
case TypedValue.COMPLEX_UNIT_IN:
return value * metrics.xdpi;
case TypedValue.COMPLEX_UNIT_MM:
return value * metrics.xdpi * (1.0f/25.4f);
}
return 0;
}
/**
*
* 描述：View树递归调用做适配.
* AbAppConfig.uiWidth = 1080;
* AbAppConfig.uiHeight = 700;
* scaleContentView((RelativeLayout)findViewById(R.id.rootLayout));
* 要求布局中的单位都用px并且和美工的设计图尺寸一致，包括所有宽高，Padding,Margin,文字大小
* @param contentView
*/
public static void scaleContentView(ViewGroup contentView){
AbViewUtil.scaleView(contentView);
if(contentView.getChildCount()>0){
for(int i=0;i<contentView.getChildCount();i++){
View view = contentView.getChildAt(i);
if(view instanceof ViewGroup){
if(isNeedScale(view)){
scaleContentView((ViewGroup)(view));
}
}else{
scaleView(contentView.getChildAt(i));
}
}
}
}
/**
*
* 描述：View树递归调用做适配.
* AbAppConfig.uiWidth = 1080;
* AbAppConfig.uiHeight = 700;
* scaleContentView(context,R.id.rootLayout);
* 要求布局中的单位都用px并且和美工的设计图尺寸一致，包括所有宽高，Padding,Margin,文字大小
* @param parent
* @param id
*/
public static void scaleContentView(View parent,int id){
ViewGroup contentView = null;
View view = parent.findViewById(id);
if(view instanceof ViewGroup){
contentView = (ViewGroup)view;
scaleContentView(contentView);
}
}
/**
*
* 描述：View树递归调用做适配.
* AbAppConfig.uiWidth = 1080;
* AbAppConfig.uiHeight = 700;
* scaleContentView(context,R.id.rootLayout);
* 要求布局中的单位都用px并且和美工的设计图尺寸一致，包括所有宽高，Padding,Margin,文字大小
* @param context
* @param id
*/
public static void scaleContentView(Context context,int id){
ViewGroup contentView = null;
View view = ((Activity)context).findViewById(id);
if(view instanceof ViewGroup){
contentView = (ViewGroup)view;
scaleContentView(contentView);
}
}
/**
* 按比例缩放View，以布局中的尺寸为基准
* @param view
*/
@SuppressLint("NewApi")
public static void scaleView(View view){
if(!isNeedScale(view)){
return;
}
if (view instanceof TextView){
TextView textView = (TextView) view;
setTextSize(textView,textView.getTextSize());
}
ViewGroup.LayoutParams params = (ViewGroup.LayoutParams) view.getLayoutParams();
if (null != params){
int width = INVALID;
int height = INVALID;
if (params.width != ViewGroup.LayoutParams.WRAP_CONTENT
&& params.width != ViewGroup.LayoutParams.MATCH_PARENT){
width = params.width;
}
if (params.height != ViewGroup.LayoutParams.WRAP_CONTENT
&& params.height != ViewGroup.LayoutParams.MATCH_PARENT){
height = params.height;
}
//size
setViewSize(view,width,height);
// Padding
setPadding(view,view.getPaddingLeft(),view.getPaddingTop(),view.getPaddingRight(),view.getPaddingBottom());
}
// Margin
if(view.getLayoutParams() instanceof MarginLayoutParams){
MarginLayoutParams mMarginLayoutParams = (MarginLayoutParams) view
.getLayoutParams();
if (mMarginLayoutParams != null){
setMargin(view,mMarginLayoutParams.leftMargin,mMarginLayoutParams.topMargin,mMarginLayoutParams.rightMargin,mMarginLayoutParams.bottomMargin);
}
}
if(VERSION.SDK_INT>=16){
//最大最小宽高
int minWidth = scaleValue(view.getContext(),view.getMinimumWidth());
int minHeight = scaleValue(view.getContext(),view.getMinimumHeight());
view.setMinimumWidth(minWidth);
view.setMinimumHeight(minHeight);
}
}
/**
*
* 描述：是否需要Scale.
* @param view
* @return
*/
public static boolean isNeedScale(View view){
if (view instanceof AbListViewHeader){
return false;
}
if (view instanceof AbListViewFooter){
return false;
}
return true;
}
/**
* 缩放文字大小
* @param textView button
* @param size sp值
* @return
*/
public static void setSPTextSize(TextView textView,float size) {
float scaledSize = scaleTextValue(textView.getContext(),size);
textView.setTextSize(scaledSize);
}
/**
* 缩放文字大小,这样设置的好处是文字的大小不和密度有关，
* 能够使文字大小在不同的屏幕上显示比例正确
* @param textView button
* @param sizePixels px值
* @return
*/
public static void setTextSize(TextView textView,float sizePixels) {
float scaledSize = scaleTextValue(textView.getContext(),sizePixels);
textView.setTextSize(TypedValue.COMPLEX_UNIT_PX,scaledSize);
}
/**
* 缩放文字大小
* @param context
* @param textPaint
* @param sizePixels px值
* @return
*/
public static void setTextSize(Context context,TextPaint textPaint,float sizePixels) {
float scaledSize = scaleTextValue(context,sizePixels);
textPaint.setTextSize(scaledSize);
}
/**
* 缩放文字大小
* @param context
* @param paint
* @param sizePixels px值
* @return
*/
public static void setTextSize(Context context,Paint paint,float sizePixels) {
float scaledSize = scaleTextValue(context,sizePixels);
paint.setTextSize(scaledSize);
}
/**
* 设置View的PX尺寸
* @param view 如果是代码new出来的View，需要设置一个适合的LayoutParams
* @param widthPixels
* @param heightPixels
*/
public static void setViewSize(View view,int widthPixels, int heightPixels){
int scaledWidth = scaleValue(view.getContext(), widthPixels);
int scaledHeight = scaleValue(view.getContext(), heightPixels);
ViewGroup.LayoutParams params = view.getLayoutParams();
if(params == null){
AbLogUtil.e(AbViewUtil.class, "setViewSize出错,如果是代码new出来的View，需要设置一个适合的LayoutParams");
return;
}
if (widthPixels != INVALID){
params.width = scaledWidth;
}
if (heightPixels != INVALID && heightPixels!=1){
params.height = scaledHeight;
}
view.setLayoutParams(params);
}
/**
* 设置PX padding.
*
* @param view the view
* @param left the left padding in pixels
* @param top the top padding in pixels
* @param right the right padding in pixels
* @param bottom the bottom padding in pixels
*/
public static void setPadding(View view, int left,
int top, int right, int bottom) {
int scaledLeft = scaleValue(view.getContext(), left);
int scaledTop = scaleValue(view.getContext(), top);
int scaledRight = scaleValue(view.getContext(), right);
int scaledBottom = scaleValue(view.getContext(), bottom);
view.setPadding(scaledLeft, scaledTop, scaledRight, scaledBottom);
}
/**
* setting PX margin.
*
* @param view the view
* @param left the left margin in pixels
* @param top the top margin in pixels
* @param right the right margin in pixels
* @param bottom the bottom margin in pixels
*/
public static void setMargin(View view, int left, int top,
int right, int bottom) {
int scaledLeft = scaleValue(view.getContext(), left);
int scaledTop = scaleValue(view.getContext(), top);
int scaledRight = scaleValue(view.getContext(), right);
int scaledBottom = scaleValue(view.getContext(), bottom);
if(view.getLayoutParams() instanceof MarginLayoutParams){
MarginLayoutParams mMarginLayoutParams = (MarginLayoutParams) view
.getLayoutParams();
if (mMarginLayoutParams != null){
if (left != INVALID) {
mMarginLayoutParams.leftMargin = scaledLeft;
}
if (right != INVALID) {
mMarginLayoutParams.rightMargin = scaledRight;
}
if (top != INVALID) {
mMarginLayoutParams.topMargin = scaledTop;
}
if (bottom != INVALID) {
mMarginLayoutParams.bottomMargin = scaledBottom;
}
view.setLayoutParams(mMarginLayoutParams);
}
}
}
}
下面简单介绍其用法。
1）首先，自定义一个Application子类。
2）将自定义Application子类添加到Manifest文件中。
<application
android:name=".application.MyApplication"3）在Application子类的onCreate()方法中添加美工尺寸。
//美工效果图分辨率，用于适配
AbAppConfig.UI_WIDTH = 640;
AbAppConfig.UI_HEIGHT = 1136;4）然后，在布局文件的最外层容器中添加一个id。
android:id="@+id/act_main_root_layout"5）如果是Activity，那么在Activity的onCreate（）方法中添加如下内容。
setContentView(R.layout.activity_forget_pwd);
//根据屏幕分辨率和屏幕密度自定缩放
AbViewUtil.scaleContentView((LinearLayout) findViewById(R.id.act_main_root_layout));如果是Fragment，那么在Fragment的onCreateView（）方法中添加如下内容。
inflater = LayoutInflater.from(getActivity());
rootView = inflater.inflate(R.layout.fragment_function, container, false);
AbViewUtil.scaleContentView((LinearLayout) rootView.findViewById(R.id.fgm_main_root_layout));6）注意，布局文件中的宽高和文字大小都统一使用美工提供的分辨率的值，单位统一使用px，至此。一个Activity的屏幕适配就完成了。
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