├── app ├── .gitignore ├── src │ ├── main │ │ ├── res │ │ │ ├── values │ │ │ │ ├── strings.xml │ │ │ │ ├── colors.xml │ │ │ │ └── styles.xml │ │ │ ├── mipmap-hdpi │ │ │ │ ├── ic_launcher.png │ │ │ │ └── ic_launcher_round.png │ │ │ ├── mipmap-mdpi │ │ │ │ ├── ic_launcher.png │ │ │ │ └── ic_launcher_round.png │ │ │ ├── mipmap-xhdpi │ │ │ │ ├── ic_launcher.png │ │ │ │ └── ic_launcher_round.png │ │ │ ├── mipmap-xxhdpi │ │ │ │ ├── ic_launcher.png │ │ │ │ └── ic_launcher_round.png │ │ │ ├── mipmap-xxxhdpi │ │ │ │ ├── ic_launcher.png │ │ │ │ └── ic_launcher_round.png │ │ │ ├── mipmap-anydpi-v26 │ │ │ │ ├── ic_launcher.xml │ │ │ │ └── ic_launcher_round.xml │ │ │ ├── layout │ │ │ │ └── activity_main.xml │ │ │ ├── drawable-v24 │ │ │ │ └── ic_launcher_foreground.xml │ │ │ └── drawable │ │ │ │ └── ic_launcher_background.xml │ │ ├── java │ │ │ └── com │ │ │ │ └── toperc │ │ │ │ └── screenadaptation │ │ │ │ ├── MyApplication.java │ │ │ │ ├── MainActivity.java │ │ │ │ └── ScreenUtil.java │ │ └── AndroidManifest.xml │ ├── test │ │ └── java │ │ │ └── com │ │ │ └── toperc │ │ │ └── screenadaptation │ │ │ └── ExampleUnitTest.java │ └── androidTest │ │ └── java │ │ └── com │ │ └── toperc │ │ └── screenadaptation │ │ └── ExampleInstrumentedTest.java ├── proguard-rules.pro └── build.gradle ├── settings.gradle ├── screenshots ├── 0.png ├── 1.png └── 2.png ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── .gitignore ├── .idea ├── vcs.xml ├── modules.xml ├── runConfigurations.xml ├── gradle.xml └── misc.xml ├── gradle.properties ├── gradlew.bat ├── README.md └── gradlew /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app' 2 | -------------------------------------------------------------------------------- /screenshots/0.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ixinrun/ScreenAdaptation/HEAD/screenshots/0.png -------------------------------------------------------------------------------- /screenshots/1.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ixinrun/ScreenAdaptation/HEAD/screenshots/1.png -------------------------------------------------------------------------------- /screenshots/2.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ixinrun/ScreenAdaptation/HEAD/screenshots/2.png -------------------------------------------------------------------------------- /app/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | ScreenAdaptation 3 | 4 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ixinrun/ScreenAdaptation/HEAD/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ixinrun/ScreenAdaptation/HEAD/app/src/main/res/mipmap-hdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-mdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ixinrun/ScreenAdaptation/HEAD/app/src/main/res/mipmap-mdpi/ic_launcher.png 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-------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ixinrun/ScreenAdaptation/HEAD/app/src/main/res/mipmap-hdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-mdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ixinrun/ScreenAdaptation/HEAD/app/src/main/res/mipmap-mdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xhdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ixinrun/ScreenAdaptation/HEAD/app/src/main/res/mipmap-xhdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ixinrun/ScreenAdaptation/HEAD/app/src/main/res/mipmap-xxhdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/ixinrun/ScreenAdaptation/HEAD/app/src/main/res/mipmap-xxxhdpi/ic_launcher_round.png -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/workspace.xml 5 | /.idea/libraries 6 | .DS_Store 7 | /build 8 | /captures 9 | .externalNativeBuild 10 | -------------------------------------------------------------------------------- /.idea/vcs.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /app/src/main/res/values/colors.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | #3F51B5 4 | #303F9F 5 | #FF4081 6 | 7 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Sun May 20 15:47:53 CST 2018 2 | distributionBase=GRADLE_USER_HOME 3 | distributionPath=wrapper/dists 4 | zipStoreBase=GRADLE_USER_HOME 5 | zipStorePath=wrapper/dists 6 | distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip 7 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | -------------------------------------------------------------------------------- /.idea/modules.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | -------------------------------------------------------------------------------- /app/src/main/java/com/toperc/screenadaptation/MyApplication.java: -------------------------------------------------------------------------------- 1 | package com.toperc.screenadaptation; 2 | 3 | import android.app.Application; 4 | 5 | /** 6 | * Created by toperc on 2018/5/20. 7 | */ 8 | 9 | public class MyApplication extends Application { 10 | 11 | @Override 12 | public void onCreate() { 13 | super.onCreate(); 14 | ScreenUtil.resetDensity(this); 15 | } 16 | 17 | } 18 | -------------------------------------------------------------------------------- /app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /app/src/test/java/com/toperc/screenadaptation/ExampleUnitTest.java: -------------------------------------------------------------------------------- 1 | package com.toperc.screenadaptation; 2 | 3 | import org.junit.Test; 4 | 5 | import static org.junit.Assert.*; 6 | 7 | /** 8 | * Example local unit test, which will execute on the development machine (host). 9 | * 10 | * @see Testing documentation 11 | */ 12 | public class ExampleUnitTest { 13 | @Test 14 | public void addition_isCorrect() throws Exception { 15 | assertEquals(4, 2 + 2); 16 | } 17 | } -------------------------------------------------------------------------------- /.idea/runConfigurations.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 11 | 12 | -------------------------------------------------------------------------------- /.idea/gradle.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 17 | 18 | -------------------------------------------------------------------------------- /gradle.properties: -------------------------------------------------------------------------------- 1 | # Project-wide Gradle settings. 2 | 3 | # IDE (e.g. Android Studio) users: 4 | # Gradle settings configured through the IDE *will override* 5 | # any settings specified in this file. 6 | 7 | # For more details on how to configure your build environment visit 8 | # http://www.gradle.org/docs/current/userguide/build_environment.html 9 | 10 | # Specifies the JVM arguments used for the daemon process. 11 | # The setting is particularly useful for tweaking memory settings. 12 | org.gradle.jvmargs=-Xmx1536m 13 | 14 | # When configured, Gradle will run in incubating parallel mode. 15 | # This option should only be used with decoupled projects. More details, visit 16 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects 17 | # org.gradle.parallel=true 18 | -------------------------------------------------------------------------------- /app/src/main/java/com/toperc/screenadaptation/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.toperc.screenadaptation; 2 | 3 | import android.content.res.Configuration; 4 | import android.os.Bundle; 5 | import android.support.v7.app.AppCompatActivity; 6 | 7 | public class MainActivity extends AppCompatActivity { 8 | 9 | @Override 10 | protected void onCreate(Bundle savedInstanceState) { 11 | super.onCreate(savedInstanceState); 12 | //一定要写在setContentView之前 13 | ScreenUtil.resetDensity(this); 14 | setContentView(R.layout.activity_main); 15 | } 16 | 17 | @Override 18 | public void onConfigurationChanged(Configuration newConfig) { 19 | super.onConfigurationChanged(newConfig); 20 | //屏幕旋转时会使一些参数初始化，所以也需要在此重置一下 21 | ScreenUtil.resetDensity(this); 22 | } 23 | } 24 | -------------------------------------------------------------------------------- /app/proguard-rules.pro: -------------------------------------------------------------------------------- 1 | # Add project specific ProGuard rules here. 2 | # You can control the set of applied configuration files using the 3 | # proguardFiles setting in build.gradle. 4 | # 5 | # For more details, see 6 | # http://developer.android.com/guide/developing/tools/proguard.html 7 | 8 | # If your project uses WebView with JS, uncomment the following 9 | # and specify the fully qualified class name to the JavaScript interface 10 | # class: 11 | #-keepclassmembers class fqcn.of.javascript.interface.for.webview { 12 | # public *; 13 | #} 14 | 15 | # Uncomment this to preserve the line number information for 16 | # debugging stack traces. 17 | #-keepattributes SourceFile,LineNumberTable 18 | 19 | # If you keep the line number information, uncomment this to 20 | # hide the original source file name. 21 | #-renamesourcefileattribute SourceFile 22 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | -------------------------------------------------------------------------------- /app/src/androidTest/java/com/toperc/screenadaptation/ExampleInstrumentedTest.java: -------------------------------------------------------------------------------- 1 | package com.toperc.screenadaptation; 2 | 3 | import android.content.Context; 4 | import android.support.test.InstrumentationRegistry; 5 | import android.support.test.runner.AndroidJUnit4; 6 | 7 | import org.junit.Test; 8 | import org.junit.runner.RunWith; 9 | 10 | import static org.junit.Assert.*; 11 | 12 | /** 13 | * Instrumented test, which will execute on an Android device. 14 | * 15 | * @see Testing documentation 16 | */ 17 | @RunWith(AndroidJUnit4.class) 18 | public class ExampleInstrumentedTest { 19 | @Test 20 | public void useAppContext() throws Exception { 21 | // Context of the app under test. 22 | Context appContext = InstrumentationRegistry.getTargetContext(); 23 | 24 | assertEquals("com.toperc.screenadaptation", appContext.getPackageName()); 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | android { 4 | compileSdkVersion 27 5 | defaultConfig { 6 | applicationId "com.toperc.screenadaptation" 7 | minSdkVersion 15 8 | targetSdkVersion 27 9 | versionCode 1 10 | versionName "1.0" 11 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 12 | } 13 | buildTypes { 14 | release { 15 | minifyEnabled false 16 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 17 | } 18 | } 19 | } 20 | 21 | dependencies { 22 | implementation fileTree(dir: 'libs', include: ['*.jar']) 23 | implementation 'com.android.support:appcompat-v7:27.1.1' 24 | implementation 'com.android.support.constraint:constraint-layout:1.1.0' 25 | testImplementation 'junit:junit:4.12' 26 | androidTestImplementation 'com.android.support.test:runner:1.0.2' 27 | androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2' 28 | } 29 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 6 | 9 | 10 | 17 | 18 | 26 | 27 | 28 | 29 | 37 | 38 | 39 | -------------------------------------------------------------------------------- /app/src/main/java/com/toperc/screenadaptation/ScreenUtil.java: -------------------------------------------------------------------------------- 1 | package com.toperc.screenadaptation; 2 | 3 | import android.content.Context; 4 | import android.util.DisplayMetrics; 5 | 6 | /** 7 | * @author Toperc 8 | * @date 2018/6/13 9 | * @description 10 | */ 11 | public class ScreenUtil { 12 | 13 | private static float ORIGINAL_DENSITY = -1; //原始屏幕密度比率 14 | 15 | /** 16 | * 重置屏幕密度 17 | */ 18 | public static void resetDensity(Context context) { 19 | //绘制页面时参照的设计图尺寸 20 | final float DESIGN_WIDTH = 800f; 21 | final float DESIGN_HEIGHT = 1280f; 22 | final float DESTGN_INCH = 5.0f; 23 | //大屏调节因子，范围0~1，因屏幕同比例放大视图显示非常傻大憨，用于调节感官度 24 | final float BIG_SCREEN_FACTOR = 0.8f; 25 | 26 | DisplayMetrics dm = context.getResources().getDisplayMetrics(); 27 | 28 | //确定放大缩小比率 29 | float rate = Math.min(dm.widthPixels, dm.heightPixels) / Math.min(DESIGN_WIDTH, DESIGN_HEIGHT); 30 | //确定参照屏幕密度比率 31 | float referenceDensity = (float) Math.sqrt(DESIGN_WIDTH * DESIGN_WIDTH + DESIGN_HEIGHT * DESIGN_HEIGHT) / DESTGN_INCH / DisplayMetrics.DENSITY_DEFAULT; 32 | //确定最终屏幕密度比率 33 | float relativeDensity = referenceDensity * rate; 34 | 35 | if (ORIGINAL_DENSITY == -1) { 36 | ORIGINAL_DENSITY = dm.density; 37 | } 38 | if (relativeDensity > ORIGINAL_DENSITY) { 39 | relativeDensity = ORIGINAL_DENSITY + (relativeDensity - ORIGINAL_DENSITY) * BIG_SCREEN_FACTOR; 40 | } 41 | dm.density = relativeDensity; 42 | dm.densityDpi = (int) (relativeDensity * DisplayMetrics.DENSITY_DEFAULT); 43 | dm.scaledDensity = relativeDensity; 44 | } 45 | 46 | 47 | } 48 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 16 | 26 | 27 | 28 | 29 | 30 | 31 | 33 | -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 12 | 13 | 19 | 22 | 25 | 26 | 27 | 28 | 34 | 35 | -------------------------------------------------------------------------------- /gradlew.bat: -------------------------------------------------------------------------------- 1 | @if "%DEBUG%" == "" @echo off 2 | @rem ########################################################################## 3 | @rem 4 | @rem Gradle startup script for Windows 5 | @rem 6 | @rem ########################################################################## 7 | 8 | @rem Set local scope for the variables with windows NT shell 9 | if "%OS%"=="Windows_NT" setlocal 10 | 11 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 12 | set DEFAULT_JVM_OPTS= 13 | 14 | set DIRNAME=%~dp0 15 | if "%DIRNAME%" == "" set DIRNAME=. 16 | set APP_BASE_NAME=%~n0 17 | set APP_HOME=%DIRNAME% 18 | 19 | @rem Find java.exe 20 | if defined JAVA_HOME goto findJavaFromJavaHome 21 | 22 | set JAVA_EXE=java.exe 23 | %JAVA_EXE% -version >NUL 2>&1 24 | if "%ERRORLEVEL%" == "0" goto init 25 | 26 | echo. 27 | echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 28 | echo. 29 | echo Please set the JAVA_HOME variable in your environment to match the 30 | echo location of your Java installation. 31 | 32 | goto fail 33 | 34 | :findJavaFromJavaHome 35 | set JAVA_HOME=%JAVA_HOME:"=% 36 | set JAVA_EXE=%JAVA_HOME%/bin/java.exe 37 | 38 | if exist "%JAVA_EXE%" goto init 39 | 40 | echo. 41 | echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 42 | echo. 43 | echo Please set the JAVA_HOME variable in your environment to match the 44 | echo location of your Java installation. 45 | 46 | goto fail 47 | 48 | :init 49 | @rem Get command-line arguments, handling Windowz variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | if "%@eval[2+2]" == "4" goto 4NT_args 53 | 54 | :win9xME_args 55 | @rem Slurp the command line arguments. 56 | set CMD_LINE_ARGS= 57 | set _SKIP=2 58 | 59 | :win9xME_args_slurp 60 | if "x%~1" == "x" goto execute 61 | 62 | set CMD_LINE_ARGS=%* 63 | goto execute 64 | 65 | :4NT_args 66 | @rem Get arguments from the 4NT Shell from JP Software 67 | set CMD_LINE_ARGS=%$ 68 | 69 | :execute 70 | @rem Setup the command line 71 | 72 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 73 | 74 | @rem Execute Gradle 75 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 76 | 77 | :end 78 | @rem End local scope for the variables with windows NT shell 79 | if "%ERRORLEVEL%"=="0" goto mainEnd 80 | 81 | :fail 82 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 83 | rem the _cmd.exe /c_ return code! 84 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 85 | exit /b 1 86 | 87 | :mainEnd 88 | if "%OS%"=="Windows_NT" endlocal 89 | 90 | :omega 91 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # ScreenAdaptation 2 | One-step screen adaptation. 3 | 4 | 大家都知道Android屏幕适配是件非常头疼的事，目前全世界安卓设备的大大小小分辨率，大大小小的尺寸，最终形成的设备屏幕大小种类不计其数，但就这一项就给开发者造成了不少困难，总是照顾住这种屏幕照顾不了那种屏幕。 5 | 6 | 先来放一种很熟悉的图： 7 | 8 | 9 | 针对Android屏幕适配，除了我们按照“灵活运用布局”、“尺寸限定符”、“布局相关属性”、“.9图”、“屏幕密度适配”等官方标准，但是却发现还远远不够，要么添加很多图片(从加载性能说似乎是必要的)使得apk变得很大，要么有多套布局工作量变大难以维护。针对屏幕适配，google官方也是系统默认支持的是采用屏幕像素密度来进行匹配相关资源和长度的，这一块不做过多的阐述了，建议参看官方文档。 10 | 11 | 这里我提供一个最牛、最简单、一步到位的方案，大概其优点如下： 12 | 13 | - 只需要提供一套最优图片，用于减小apk包大小。当然为了加载性能和图片更精细化显示采用多套也可以。 14 | - 无论大小屏如果布局确定只需要一套布局，当然如果横竖屏变换不同的屏幕展示，多套也是必要的。 15 | - 没有重叠的现象发生，按照默认布局方法可能在大屏上适配很好，到小屏上却出现重叠的现象，很常见，但这里我不允许他有！ 16 | - 无论大小屏整体看过去布局几乎相同，因为是按比例来的。 17 | - 在大屏上展示不会随着完全比例放大而显得傻、大、憨。 18 | 19 | 其原理也很简单，就是根据基准屏幕像素密度来进行适当缩放后得到相对屏幕像素，然后给系统的像素密度重新赋值。 20 | 21 | 准备工作： 22 | 确定一套基准屏幕参数，然后布局时根据这套参数布局，单位仍然采用dp，并尽可能确定其布局控件的长度。 23 | ```java 24 | //绘制页面时参照的设计图尺寸 25 | final float DESIGN_WIDTH = 1080f; 26 | final float DESIGN_HEIGHT = 1920f; 27 | final float DESTGN_INCH = 5.0f; 28 | ``` 29 | 30 | 三步走： 31 | 1. 确定放大缩小比例 32 | 2. 确定参考屏幕密度 33 | 3. 确定相对屏幕密度并重新赋值给系统的像素密度 34 | 35 | 主要方法： 36 | ```java 37 | /** 38 | * 重置屏幕密度 39 | */ 40 | public static void resetDensity(Context context) { 41 | //绘制页面时参照的设计图尺寸 42 | final float DESIGN_WIDTH = 800f; 43 | final float DESIGN_HEIGHT = 1280f; 44 | final float DESTGN_INCH = 5.0f; 45 | //大屏调节因子，范围0~1，因屏幕同比例放大视图显示非常傻大憨，用于调节感官度 46 | final float BIG_SCREEN_FACTOR = 0.8f; 47 | 48 | DisplayMetrics dm = context.getResources().getDisplayMetrics(); 49 | 50 | //确定放大缩小比率 51 | float rate = Math.min(dm.widthPixels, dm.heightPixels) / Math.min(DESIGN_WIDTH, DESIGN_HEIGHT); 52 | //确定参照屏幕密度比率 53 | float referenceDensity = (float) Math.sqrt(DESIGN_WIDTH * DESIGN_WIDTH + DESIGN_HEIGHT * DESIGN_HEIGHT) / DESTGN_INCH / DisplayMetrics.DENSITY_DEFAULT; 54 | //确定最终屏幕密度比率 55 | float relativeDensity = referenceDensity * rate; 56 | 57 | if (ORIGINAL_DENSITY == -1) { 58 | ORIGINAL_DENSITY = dm.density; 59 | } 60 | if (relativeDensity > ORIGINAL_DENSITY) { 61 | relativeDensity = ORIGINAL_DENSITY + (relativeDensity - ORIGINAL_DENSITY) * BIG_SCREEN_FACTOR; 62 | } 63 | dm.density = relativeDensity; 64 | dm.densityDpi = (int) (relativeDensity * DisplayMetrics.DENSITY_DEFAULT); 65 | dm.scaledDensity = relativeDensity; 66 | } 67 | ``` 68 | 上边放大缩小比例是根据屏幕的长宽和参考屏幕的长宽对应设定的，这样计算出来的屏幕密度是固定的。 69 | 注意最终赋值的三个成员变量的含义： 70 | - dm.density 71 | 屏幕密度比率，不同设备的屏幕视图的长宽大小都是根据屏幕密度比率与屏幕密度基准值（160dp）的乘积。此成员变量控制拥有固定长宽值视图的缩放。 72 | - dm.densityDpi 73 | 实际屏幕密度比率，但是单独设定此值并不一定起到缩放效果，需要配合density一起设定，此成员变量控制长宽自动wrapConent形式的缩放，因为wrapContent形式下系统自动为其分配默认的屏幕密度，如果不对其重新赋值，则不能根据规则进行缩放。 74 | - dm.scaledDensity 75 | 独立像素密度，主要处理字体大小缩放，目前比较流行的字体单位为dp，第一能随着应用适应不同的设备缩放，第二避免了跟随系统缩放使得布局展示错乱。但是某些系统机开发者不能控制的例如toast字体大小等默认使用的单位仍然是sp,所以此成员变量也需要进行重新赋值。系统默认应用sp和dp二者的比率为1，但是某些情况下又想根据系统缩放，还要保持整体缩放比率，这是就要系统缩放和应用缩放结合着得出一个比率来最终赋值了。 76 | 77 | 配置地方： 78 | DisplayMetrics相关参数的值有两种，一种是默认的，一种是动态调整后的。 79 | 获取默认的： 80 | ```java 81 | DisplayMetrics display = new DisplayMetrics(); 82 | getWindowManager().getDefaultDisplay().getMetrics(display); 83 | ``` 84 | 获取动态调整后的： 85 | ```java 86 | DisplayMetrics dm = context.getResources().getDisplayMetrics(); 87 | ``` 88 | 89 | 应用展示最终使用的DisplayMetrics相关参数就是调整后的。android8.0之前，整个应用长宽缩放比率均是采用一套，无论时Activity和Application两者任意其一配置均可，但是在Android8.0的时候，系统架构调整，由原来的统一现在重点分配到每个Activity中和Application中，为了兼顾全局，两者都要设置，尤其是Activity。Activity中设置的时候要注意一定要设置在setContentView()之前，Application设置在onCreat()即可。 90 | 还应注意一点，当屏幕旋转时有时我们为了保存相关状态，所以不想让Activity的onCreat()方法重走一遍，但是屏幕旋转会使得屏幕密度参数进行重置，不得已我们还要在屏幕旋转的时候在重新设置一下屏幕密度。 91 | 源码中屏幕旋转所作的工作： 92 | ```java 93 | @Override 94 | public void onConfigurationChanged(Configuration newConfig) { 95 | super.onConfigurationChanged(newConfig); 96 | getDelegate().onConfigurationChanged(newConfig); 97 | if (mResources != null) { 98 | // The real (and thus managed) resources object was already updated 99 | // by ResourcesManager, so pull the current metrics from there. 100 | final DisplayMetrics newMetrics = super.getResources().getDisplayMetrics(); 101 | mResources.updateConfiguration(newConfig, newMetrics); 102 | } 103 | } 104 | ``` 105 | 为了使这个应用产生效果，建议将Activity形式的配置在BaseActivity中。 106 | Activity中： 107 | ```java 108 | @Override 109 | protected void onCreate(Bundle savedInstanceState) { 110 | super.onCreate(savedInstanceState); 111 | //一定要写在setContentView之前 112 | ScreenUtil.resetDensity(this); 113 | setContentView(R.layout.activity_main); 114 | } 115 | 116 | @Override 117 | public void onConfigurationChanged(Configuration newConfig) { 118 | super.onConfigurationChanged(newConfig); 119 | //屏幕旋转时会使一些参数初始化，所以也需要在此重置一下 120 | ScreenUtil.resetDensity(this); 121 | } 122 | ``` 123 | Application中： 124 | ```java 125 | @Override 126 | public void onCreate() { 127 | super.onCreate(); 128 | ScreenUtil.resetDensity(this); 129 | } 130 | ``` 131 | 这些配置完毕后，一旦app启动优先处理这件事，其他均按照默认处理，就是这么简单。 132 | 133 | **使用和不使用截图直观感受** 134 | 采用默认布局方式截图对比： 135 | 136 | 137 | 采用此方案截图对比： 138 | 139 | 140 | 转载请注明出处，我是toperc. 141 | 142 | -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env bash 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 10 | DEFAULT_JVM_OPTS="" 11 | 12 | APP_NAME="Gradle" 13 | APP_BASE_NAME=`basename "$0"` 14 | 15 | # Use the maximum available, or set MAX_FD != -1 to use that value. 16 | MAX_FD="maximum" 17 | 18 | warn ( ) { 19 | echo "$*" 20 | } 21 | 22 | die ( ) { 23 | echo 24 | echo "$*" 25 | echo 26 | exit 1 27 | } 28 | 29 | # OS specific support (must be 'true' or 'false'). 30 | cygwin=false 31 | msys=false 32 | darwin=false 33 | case "`uname`" in 34 | CYGWIN* ) 35 | cygwin=true 36 | ;; 37 | Darwin* ) 38 | darwin=true 39 | ;; 40 | MINGW* ) 41 | msys=true 42 | ;; 43 | esac 44 | 45 | # Attempt to set APP_HOME 46 | # Resolve links: $0 may be a link 47 | PRG="$0" 48 | # Need this for relative symlinks. 49 | while [ -h "$PRG" ] ; do 50 | ls=`ls -ld "$PRG"` 51 | link=`expr "$ls" : '.*-> \(.*\)$'` 52 | if expr "$link" : '/.*' > /dev/null; then 53 | PRG="$link" 54 | else 55 | PRG=`dirname "$PRG"`"/$link" 56 | fi 57 | done 58 | SAVED="`pwd`" 59 | cd "`dirname \"$PRG\"`/" >/dev/null 60 | APP_HOME="`pwd -P`" 61 | cd "$SAVED" >/dev/null 62 | 63 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 64 | 65 | # Determine the Java command to use to start the JVM. 66 | if [ -n "$JAVA_HOME" ] ; then 67 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 68 | # IBM's JDK on AIX uses strange locations for the executables 69 | JAVACMD="$JAVA_HOME/jre/sh/java" 70 | else 71 | JAVACMD="$JAVA_HOME/bin/java" 72 | fi 73 | if [ ! -x "$JAVACMD" ] ; then 74 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 75 | 76 | Please set the JAVA_HOME variable in your environment to match the 77 | location of your Java installation." 78 | fi 79 | else 80 | JAVACMD="java" 81 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 82 | 83 | Please set the JAVA_HOME variable in your environment to match the 84 | location of your Java installation." 85 | fi 86 | 87 | # Increase the maximum file descriptors if we can. 88 | if [ "$cygwin" = "false" -a "$darwin" = "false" ] ; then 89 | MAX_FD_LIMIT=`ulimit -H -n` 90 | if [ $? -eq 0 ] ; then 91 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 92 | MAX_FD="$MAX_FD_LIMIT" 93 | fi 94 | ulimit -n $MAX_FD 95 | if [ $? -ne 0 ] ; then 96 | warn "Could not set maximum file descriptor limit: $MAX_FD" 97 | fi 98 | else 99 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 100 | fi 101 | fi 102 | 103 | # For Darwin, add options to specify how the application appears in the dock 104 | if $darwin; then 105 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 106 | fi 107 | 108 | # For Cygwin, switch paths to Windows format before running java 109 | if $cygwin ; then 110 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 111 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 112 | JAVACMD=`cygpath --unix "$JAVACMD"` 113 | 114 | # We build the pattern for arguments to be converted via cygpath 115 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 116 | SEP="" 117 | for dir in $ROOTDIRSRAW ; do 118 | ROOTDIRS="$ROOTDIRS$SEP$dir" 119 | SEP="|" 120 | done 121 | OURCYGPATTERN="(^($ROOTDIRS))" 122 | # Add a user-defined pattern to the cygpath arguments 123 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 124 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 125 | fi 126 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 127 | i=0 128 | for arg in "$@" ; do 129 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 130 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 131 | 132 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 133 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 134 | else 135 | eval `echo args$i`="\"$arg\"" 136 | fi 137 | i=$((i+1)) 138 | done 139 | case $i in 140 | (0) set -- ;; 141 | (1) set -- "$args0" ;; 142 | (2) set -- "$args0" "$args1" ;; 143 | (3) set -- "$args0" "$args1" "$args2" ;; 144 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 145 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 146 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 147 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 148 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 149 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 150 | esac 151 | fi 152 | 153 | # Split up the JVM_OPTS And GRADLE_OPTS values into an array, following the shell quoting and substitution rules 154 | function splitJvmOpts() { 155 | JVM_OPTS=("$@") 156 | } 157 | eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS 158 | JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME" 159 | 160 | exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@" 161 | -------------------------------------------------------------------------------- /app/src/main/res/drawable/ic_launcher_background.xml: -------------------------------------------------------------------------------- 1 | 2 | 7 | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | 110 | 115 | 120 | 125 | 130 | 135 | 140 | 145 | 150 | 155 | 160 | 165 | 170 | 171 | --------------------------------------------------------------------------------