├── 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 │ │ │ │ ├── fragment_1.xml │ │ │ │ ├── fragment_2.xml │ │ │ │ └── activity_main.xml │ │ │ ├── drawable-v24 │ │ │ │ └── ic_launcher_foreground.xml │ │ │ └── drawable │ │ │ │ └── ic_launcher_background.xml │ │ ├── AndroidManifest.xml │ │ └── java │ │ │ └── com │ │ │ └── app │ │ │ └── demo │ │ │ ├── Fragment1.java │ │ │ ├── Fragment2.java │ │ │ ├── ViewPager_Fragment_Adapter.java │ │ │ ├── CustomScrollViewPager.java │ │ │ ├── HoldTabScrollView.java │ │ │ └── MainActivity.java │ ├── test │ │ └── java │ │ │ └── com │ │ │ └── app │ │ │ └── demo │ │ │ └── ExampleUnitTest.java │ └── androidTest │ │ └── java │ │ └── com │ │ └── app │ │ └── demo │ │ └── ExampleInstrumentedTest.java ├── proguard-rules.pro └── build.gradle ├── settings.gradle ├── 1.png ├── xiaoguo.gif ├── gradle └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── .idea ├── caches │ └── build_file_checksums.ser ├── vcs.xml ├── runConfigurations.xml ├── gradle.xml ├── misc.xml └── codeStyles │ └── Project.xml ├── .gitignore ├── gradle.properties ├── gradlew.bat ├── gradlew └── README.md /app/.gitignore: -------------------------------------------------------------------------------- 1 | /build 2 | -------------------------------------------------------------------------------- /settings.gradle: -------------------------------------------------------------------------------- 1 | include ':app' 2 | -------------------------------------------------------------------------------- /1.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/dafaWang/FixedTabScrollView/HEAD/1.png -------------------------------------------------------------------------------- /xiaoguo.gif: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/dafaWang/FixedTabScrollView/HEAD/xiaoguo.gif -------------------------------------------------------------------------------- /app/src/main/res/values/strings.xml: -------------------------------------------------------------------------------- 1 | 2 | SwipeRececler 3 | 4 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.jar: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/dafaWang/FixedTabScrollView/HEAD/gradle/wrapper/gradle-wrapper.jar -------------------------------------------------------------------------------- /.idea/caches/build_file_checksums.ser: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/dafaWang/FixedTabScrollView/HEAD/.idea/caches/build_file_checksums.ser -------------------------------------------------------------------------------- /app/src/main/res/mipmap-hdpi/ic_launcher.png: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/dafaWang/FixedTabScrollView/HEAD/app/src/main/res/mipmap-hdpi/ic_launcher.png -------------------------------------------------------------------------------- /app/src/main/res/mipmap-mdpi/ic_launcher.png: 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-------------------------------------------------------------------------------- 1 | *.iml 2 | .gradle 3 | /local.properties 4 | /.idea/libraries 5 | /.idea/modules.xml 6 | /.idea/workspace.xml 7 | .DS_Store 8 | /build 9 | /captures 10 | .externalNativeBuild 11 | -------------------------------------------------------------------------------- /.idea/vcs.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 6 | -------------------------------------------------------------------------------- /gradle/wrapper/gradle-wrapper.properties: -------------------------------------------------------------------------------- 1 | #Fri Jun 22 12:01:21 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-4.4-all.zip 7 | -------------------------------------------------------------------------------- /app/src/main/res/values/colors.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | #3F51B5 4 | #3F5100 5 | #303F9F 6 | #FF4081 7 | 8 | -------------------------------------------------------------------------------- /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 | -------------------------------------------------------------------------------- /app/src/main/res/values/styles.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 10 | 11 | 12 | -------------------------------------------------------------------------------- /app/src/test/java/com/app/demo/ExampleUnitTest.java: -------------------------------------------------------------------------------- 1 | package com.app.demo; 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() { 15 | assertEquals(4, 2 + 2); 16 | } 17 | } -------------------------------------------------------------------------------- /app/src/main/res/layout/fragment_1.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 6 | 13 | -------------------------------------------------------------------------------- /app/src/main/res/layout/fragment_2.xml: -------------------------------------------------------------------------------- 1 | 2 | 5 | 6 | 13 | -------------------------------------------------------------------------------- /.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 | # IDE (e.g. Android Studio) users: 3 | # Gradle settings configured through the IDE *will override* 4 | # any settings specified in this file. 5 | # For more details on how to configure your build environment visit 6 | # http://www.gradle.org/docs/current/userguide/build_environment.html 7 | # Specifies the JVM arguments used for the daemon process. 8 | # The setting is particularly useful for tweaking memory settings. 9 | org.gradle.jvmargs=-Xmx1536m 10 | # When configured, Gradle will run in incubating parallel mode. 11 | # This option should only be used with decoupled projects. More details, visit 12 | # http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects 13 | # org.gradle.parallel=true 14 | -------------------------------------------------------------------------------- /app/src/main/AndroidManifest.xml: -------------------------------------------------------------------------------- 1 | 2 | 4 | 5 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | -------------------------------------------------------------------------------- /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/androidTest/java/com/app/demo/ExampleInstrumentedTest.java: -------------------------------------------------------------------------------- 1 | package com.app.demo; 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() { 21 | // Context of the app under test. 22 | Context appContext = InstrumentationRegistry.getTargetContext(); 23 | 24 | assertEquals("com.app.swiperececler", appContext.getPackageName()); 25 | } 26 | } 27 | -------------------------------------------------------------------------------- /app/src/main/java/com/app/demo/Fragment1.java: -------------------------------------------------------------------------------- 1 | package com.app.demo; 2 | 3 | import android.annotation.SuppressLint; 4 | import android.os.Bundle; 5 | import android.support.annotation.Nullable; 6 | import android.support.v4.app.Fragment; 7 | import android.view.LayoutInflater; 8 | import android.view.View; 9 | import android.view.ViewGroup; 10 | 11 | @SuppressLint("ValidFragment") 12 | public class Fragment1 extends Fragment { 13 | private CustomScrollViewPager viewPager; 14 | public Fragment1(CustomScrollViewPager viewPager) { 15 | this.viewPager = viewPager; 16 | } 17 | 18 | @Nullable 19 | @Override 20 | public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 21 | View view = View.inflate(getActivity(), R.layout.fragment_1, null); 22 | viewPager.setObjectForPosition(view,0); 23 | return view; 24 | } 25 | } 26 | -------------------------------------------------------------------------------- /app/src/main/java/com/app/demo/Fragment2.java: -------------------------------------------------------------------------------- 1 | package com.app.demo; 2 | 3 | 4 | import android.annotation.SuppressLint; 5 | import android.os.Bundle; 6 | import android.support.annotation.Nullable; 7 | import android.support.v4.app.Fragment; 8 | import android.view.LayoutInflater; 9 | import android.view.View; 10 | import android.view.ViewGroup; 11 | 12 | @SuppressLint("ValidFragment") 13 | public class Fragment2 extends Fragment { 14 | private CustomScrollViewPager viewPager; 15 | public Fragment2(CustomScrollViewPager viewPager) { 16 | this.viewPager = viewPager; 17 | } 18 | @Nullable 19 | @Override 20 | public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { 21 | View view = View.inflate(getActivity(), R.layout.fragment_2, null); 22 | viewPager.setObjectForPosition(view,1); 23 | return view; 24 | } 25 | } 26 | -------------------------------------------------------------------------------- /app/build.gradle: -------------------------------------------------------------------------------- 1 | apply plugin: 'com.android.application' 2 | 3 | android { 4 | compileSdkVersion 26 5 | buildToolsVersion '27.0.3' 6 | defaultConfig { 7 | applicationId "com.app.swiperececler" 8 | minSdkVersion 16 9 | targetSdkVersion 26 10 | versionCode 1 11 | versionName "1.0" 12 | testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 13 | } 14 | buildTypes { 15 | release { 16 | minifyEnabled false 17 | proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 18 | } 19 | } 20 | } 21 | 22 | dependencies { 23 | compile 'com.android.support:appcompat-v7:26.0.2' 24 | compile 'com.android.support.constraint:constraint-layout:1.1.2' 25 | compile 'com.android.support:recyclerview-v7:26.0.2' 26 | compile 'com.github.CymChad:BaseRecyclerViewAdapterHelper:2.9.30' 27 | compile 'com.yanzhenjie:recyclerview-swipe:1.1.4' 28 | } 29 | -------------------------------------------------------------------------------- /.idea/misc.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 17 | 27 | 28 | 29 | 30 | 31 | 32 | 34 | -------------------------------------------------------------------------------- /.idea/codeStyles/Project.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | 15 | 16 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | -------------------------------------------------------------------------------- /app/src/main/java/com/app/demo/ViewPager_Fragment_Adapter.java: -------------------------------------------------------------------------------- 1 | package com.app.demo; 2 | 3 | import android.support.v4.app.Fragment; 4 | import android.support.v4.app.FragmentManager; 5 | import android.support.v4.app.FragmentStatePagerAdapter; 6 | import android.support.v4.app.FragmentTransaction; 7 | 8 | import java.util.ArrayList; 9 | import java.util.List; 10 | 11 | public class ViewPager_Fragment_Adapter extends FragmentStatePagerAdapter { 12 | // private String[] mTitles; 13 | private List mFragments; 14 | private FragmentManager fm; 15 | public ViewPager_Fragment_Adapter(FragmentManager fm) { 16 | super(fm); 17 | } 18 | public ViewPager_Fragment_Adapter(FragmentManager fm,List fragments){ 19 | super(fm); 20 | this.fm = fm; 21 | // mTitles = titles; 22 | mFragments = fragments; 23 | } 24 | public ViewPager_Fragment_Adapter(FragmentManager fm,String[] titles,List fragments){ 25 | super(fm); 26 | this.fm = fm; 27 | // mTitles = titles; 28 | mFragments = fragments; 29 | } 30 | public void setFragments(ArrayList fragments) { 31 | if(this.mFragments != null){ 32 | FragmentTransaction ft = fm.beginTransaction(); 33 | for(Fragment f:this.mFragments){ 34 | ft.remove(f); 35 | } 36 | ft.commit(); 37 | ft=null; 38 | fm.executePendingTransactions(); 39 | } 40 | this.mFragments = fragments; 41 | notifyDataSetChanged(); 42 | } 43 | 44 | @Override 45 | public Fragment getItem(int position) { 46 | return mFragments.get(position); 47 | } 48 | 49 | /*@Override 50 | public CharSequence getPageTitle(int position) { 51 | return mTitles[position]; 52 | }*/ 53 | 54 | @Override 55 | public int getCount() { 56 | return mFragments.size(); 57 | } 58 | } -------------------------------------------------------------------------------- /app/src/main/res/drawable-v24/ic_launcher_foreground.xml: -------------------------------------------------------------------------------- 1 | 7 | 12 | 13 | 19 | 22 | 25 | 26 | 27 | 28 | 34 | 35 | -------------------------------------------------------------------------------- /app/src/main/res/layout/activity_main.xml: -------------------------------------------------------------------------------- 1 | 2 | 3 | 6 | 7 | 11 | 12 | 16 | 17 | 24 | 25 | 29 | 30 | 38 | 39 | 40 | 41 | 46 | 47 | 48 | 49 | 53 | 54 | 55 | -------------------------------------------------------------------------------- /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 | set DIRNAME=%~dp0 12 | if "%DIRNAME%" == "" set DIRNAME=. 13 | set APP_BASE_NAME=%~n0 14 | set APP_HOME=%DIRNAME% 15 | 16 | @rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 17 | set DEFAULT_JVM_OPTS= 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 Windows variants 50 | 51 | if not "%OS%" == "Windows_NT" goto win9xME_args 52 | 53 | :win9xME_args 54 | @rem Slurp the command line arguments. 55 | set CMD_LINE_ARGS= 56 | set _SKIP=2 57 | 58 | :win9xME_args_slurp 59 | if "x%~1" == "x" goto execute 60 | 61 | set CMD_LINE_ARGS=%* 62 | 63 | :execute 64 | @rem Setup the command line 65 | 66 | set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar 67 | 68 | @rem Execute Gradle 69 | "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS% 70 | 71 | :end 72 | @rem End local scope for the variables with windows NT shell 73 | if "%ERRORLEVEL%"=="0" goto mainEnd 74 | 75 | :fail 76 | rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of 77 | rem the _cmd.exe /c_ return code! 78 | if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1 79 | exit /b 1 80 | 81 | :mainEnd 82 | if "%OS%"=="Windows_NT" endlocal 83 | 84 | :omega 85 | -------------------------------------------------------------------------------- /app/src/main/java/com/app/demo/CustomScrollViewPager.java: -------------------------------------------------------------------------------- 1 | package com.app.demo; 2 | 3 | 4 | import android.content.Context; 5 | import android.support.v4.view.ViewPager; 6 | import android.util.AttributeSet; 7 | import android.view.MotionEvent; 8 | import android.view.View; 9 | import android.widget.LinearLayout; 10 | 11 | import java.util.HashMap; 12 | import java.util.LinkedHashMap; 13 | 14 | public class CustomScrollViewPager extends ViewPager { 15 | private int current; 16 | private int height = 0; 17 | /** 18 | * 保存position与对于的View 19 | */ 20 | private HashMap mChildrenViews = new LinkedHashMap(); 21 | 22 | private boolean scrollble = true; 23 | 24 | public CustomScrollViewPager(Context context) { 25 | super(context); 26 | } 27 | 28 | public CustomScrollViewPager(Context context, AttributeSet attrs) { 29 | super(context, attrs); 30 | } 31 | 32 | 33 | @Override 34 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 35 | if (mChildrenViews.size() > current) { 36 | View child = mChildrenViews.get(current); 37 | child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)); 38 | height = child.getMeasuredHeight(); 39 | } 40 | 41 | heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); 42 | 43 | super.onMeasure(widthMeasureSpec, heightMeasureSpec); 44 | } 45 | 46 | public void resetHeight(int current) { 47 | this.current = current; 48 | if (mChildrenViews.size() > current) { 49 | 50 | LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) getLayoutParams(); 51 | if (layoutParams == null) { 52 | layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, height); 53 | } else { 54 | layoutParams.height = height; 55 | } 56 | setLayoutParams(layoutParams); 57 | } 58 | } 59 | 60 | /** 61 | * 保存position与对于的View 62 | */ 63 | public void setObjectForPosition(View view, int position) { 64 | mChildrenViews.put(position, view); 65 | } 66 | 67 | 68 | @Override 69 | public boolean onTouchEvent(MotionEvent ev) { 70 | if (!scrollble) { 71 | return true; 72 | } 73 | return super.onTouchEvent(ev); 74 | } 75 | 76 | 77 | public boolean isScrollble() { 78 | return scrollble; 79 | } 80 | 81 | public void setScrollble(boolean scrollble) { 82 | this.scrollble = scrollble; 83 | } 84 | 85 | } 86 | -------------------------------------------------------------------------------- /app/src/main/java/com/app/demo/HoldTabScrollView.java: -------------------------------------------------------------------------------- 1 | package com.app.demo; 2 | 3 | 4 | import android.content.Context; 5 | import android.util.AttributeSet; 6 | import android.widget.ScrollView; 7 | import android.widget.Scroller; 8 | 9 | public class HoldTabScrollView extends ScrollView { 10 | private Scroller mScroller; 11 | 12 | public HoldTabScrollView(Context context) { 13 | this(context, null); 14 | mScroller = new Scroller(context); 15 | } 16 | 17 | public HoldTabScrollView(Context context, AttributeSet attrs) { 18 | this(context, attrs, 0); 19 | mScroller = new Scroller(context); 20 | } 21 | 22 | public HoldTabScrollView(Context context, AttributeSet attrs, int defStyleAttr) { 23 | super(context, attrs, defStyleAttr); 24 | mScroller = new Scroller(context); 25 | } 26 | 27 | //调用此方法滚动到目标位置 duration滚动时间 28 | public void smoothScrollToSlow(int fx, int fy, int duration) { 29 | int dx = fx - getScrollX();//mScroller.getFinalX(); 普通view使用这种方法 30 | int dy = fy - getScrollY(); //mScroller.getFinalY(); 31 | smoothScrollBySlow(dx, dy, duration); 32 | } 33 | 34 | //调用此方法设置滚动的相对偏移 35 | public void smoothScrollBySlow(int dx, int dy, int duration) { 36 | 37 | //设置mScroller的滚动偏移量 38 | mScroller.startScroll(getScrollX(), getScrollY(), dx, dy, duration);//scrollView使用的方法（因为可以触摸拖动） 39 | // mScroller.startScroll(mScroller.getFinalX(), mScroller.getFinalY(), dx, dy, duration); //普通view使用的方法 40 | invalidate();//这里必须调用invalidate()才能保证computeScroll()会被调用，否则不一定会刷新界面，看不到滚动效果 41 | } 42 | 43 | @Override 44 | public void computeScroll() { 45 | //先判断mScroller滚动是否完成 46 | if (mScroller.computeScrollOffset()) { 47 | 48 | //这里调用View的scrollTo()完成实际的滚动 49 | scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); 50 | 51 | //必须调用该方法，否则不一定能看到滚动效果 52 | postInvalidate(); 53 | } 54 | super.computeScroll(); 55 | } 56 | 57 | private OnHoldTabScrollViewScrollChanged mOnObservableScrollViewScrollChanged; 58 | 59 | public void setOnObservableScrollViewScrollChanged(OnHoldTabScrollViewScrollChanged mOnObservableScrollViewScrollChanged) { 60 | this.mOnObservableScrollViewScrollChanged = mOnObservableScrollViewScrollChanged; 61 | } 62 | 63 | 64 | public interface OnHoldTabScrollViewScrollChanged { 65 | void onObservableScrollViewScrollChanged(int l, int t, int oldl, int oldt); 66 | } 67 | 68 | /** 69 | * @param l Current horizontal scroll origin. 当前滑动的x轴距离 70 | * @param t Current vertical scroll origin. 当前滑动的y轴距离 71 | * @param oldl Previous horizontal scroll origin. 上一次滑动的x轴距离 72 | * @param oldt Previous vertical scroll origin. 上一次滑动的y轴距离 73 | */ 74 | @Override 75 | protected void onScrollChanged(int l, int t, int oldl, int oldt) { 76 | super.onScrollChanged(l, t, oldl, oldt); 77 | if (mOnObservableScrollViewScrollChanged != null) { 78 | mOnObservableScrollViewScrollChanged.onObservableScrollViewScrollChanged(l, t, oldl, oldt); 79 | } 80 | } 81 | 82 | @Override 83 | public void fling(int velocityY) { 84 | // super.fling(velocityY / 1000); 85 | } 86 | } 87 | -------------------------------------------------------------------------------- /app/src/main/java/com/app/demo/MainActivity.java: -------------------------------------------------------------------------------- 1 | package com.app.demo; 2 | 3 | import android.support.v4.app.Fragment; 4 | import android.support.v4.view.ViewPager; 5 | import android.support.v7.app.AppCompatActivity; 6 | import android.os.Bundle; 7 | import android.widget.RelativeLayout; 8 | import android.widget.TextView; 9 | 10 | import java.util.ArrayList; 11 | import java.util.List; 12 | 13 | public class MainActivity extends AppCompatActivity implements HoldTabScrollView.OnHoldTabScrollViewScrollChanged { 14 | 15 | private TextView tablayout; 16 | private CustomScrollViewPager viewPager; 17 | private HoldTabScrollView scrollView; 18 | private int mHeight = 0; 19 | private RelativeLayout centerRl, topRl; 20 | private boolean canJump = true; 21 | 22 | @Override 23 | protected void onCreate(Bundle savedInstanceState) { 24 | super.onCreate(savedInstanceState); 25 | setContentView(R.layout.activity_main); 26 | centerRl = findViewById(R.id.rl_center); 27 | topRl = findViewById(R.id.rl_top); 28 | tablayout = findViewById(R.id.tablayout); 29 | viewPager = findViewById(R.id.viewpager); 30 | scrollView = findViewById(R.id.root_scrollview); 31 | scrollView.setOnObservableScrollViewScrollChanged(this); 32 | List mFragments = new ArrayList<>(); 33 | mFragments.add(new Fragment1(viewPager)); 34 | mFragments.add(new Fragment2(viewPager)); 35 | 36 | ViewPager_Fragment_Adapter mAdapter = new ViewPager_Fragment_Adapter(getSupportFragmentManager(),mFragments); 37 | viewPager.setAdapter(mAdapter); 38 | viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() { 39 | @Override 40 | public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { 41 | 42 | } 43 | 44 | @Override 45 | public void onPageSelected(int position) { 46 | viewPager.resetHeight(position); 47 | } 48 | 49 | @Override 50 | public void onPageScrollStateChanged(int state) { 51 | 52 | } 53 | }); 54 | } 55 | 56 | @Override 57 | public void onWindowFocusChanged(boolean hasFocus) { 58 | super.onWindowFocusChanged(hasFocus); 59 | if (hasFocus) { 60 | //获取HeaderView的高度，当滑动大于等于这个高度的时候，需要把topView移除当前布局，放入到外层布局 61 | mHeight = centerRl.getTop(); 62 | } 63 | } 64 | 65 | @Override 66 | public void onObservableScrollViewScrollChanged(int l, int t, int oldl, int oldt) { 67 | if (t >= mHeight) { 68 | if (tablayout.getParent() != topRl) { 69 | centerRl.removeView(tablayout); 70 | topRl.addView(tablayout); 71 | canJump = false; 72 | } 73 | } else { 74 | if (tablayout.getParent() != centerRl) { 75 | topRl.removeView(tablayout); 76 | centerRl.addView(tablayout); 77 | canJump = true; 78 | } 79 | } 80 | if (canJump && t >= oldt) { 81 | scrollView.smoothScrollToSlow(0, mHeight, 300); 82 | } else if (canJump && t < oldt) { 83 | scrollView.smoothScrollToSlow(0, 0, 300); 84 | } 85 | } 86 | } -------------------------------------------------------------------------------- /gradlew: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env sh 2 | 3 | ############################################################################## 4 | ## 5 | ## Gradle start up script for UN*X 6 | ## 7 | ############################################################################## 8 | 9 | # Attempt to set APP_HOME 10 | # Resolve links: $0 may be a link 11 | PRG="$0" 12 | # Need this for relative symlinks. 13 | while [ -h "$PRG" ] ; do 14 | ls=`ls -ld "$PRG"` 15 | link=`expr "$ls" : '.*-> \(.*\)$'` 16 | if expr "$link" : '/.*' > /dev/null; then 17 | PRG="$link" 18 | else 19 | PRG=`dirname "$PRG"`"/$link" 20 | fi 21 | done 22 | SAVED="`pwd`" 23 | cd "`dirname \"$PRG\"`/" >/dev/null 24 | APP_HOME="`pwd -P`" 25 | cd "$SAVED" >/dev/null 26 | 27 | APP_NAME="Gradle" 28 | APP_BASE_NAME=`basename "$0"` 29 | 30 | # Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. 31 | DEFAULT_JVM_OPTS="" 32 | 33 | # Use the maximum available, or set MAX_FD != -1 to use that value. 34 | MAX_FD="maximum" 35 | 36 | warn () { 37 | echo "$*" 38 | } 39 | 40 | die () { 41 | echo 42 | echo "$*" 43 | echo 44 | exit 1 45 | } 46 | 47 | # OS specific support (must be 'true' or 'false'). 48 | cygwin=false 49 | msys=false 50 | darwin=false 51 | nonstop=false 52 | case "`uname`" in 53 | CYGWIN* ) 54 | cygwin=true 55 | ;; 56 | Darwin* ) 57 | darwin=true 58 | ;; 59 | MINGW* ) 60 | msys=true 61 | ;; 62 | NONSTOP* ) 63 | nonstop=true 64 | ;; 65 | esac 66 | 67 | CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar 68 | 69 | # Determine the Java command to use to start the JVM. 70 | if [ -n "$JAVA_HOME" ] ; then 71 | if [ -x "$JAVA_HOME/jre/sh/java" ] ; then 72 | # IBM's JDK on AIX uses strange locations for the executables 73 | JAVACMD="$JAVA_HOME/jre/sh/java" 74 | else 75 | JAVACMD="$JAVA_HOME/bin/java" 76 | fi 77 | if [ ! -x "$JAVACMD" ] ; then 78 | die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME 79 | 80 | Please set the JAVA_HOME variable in your environment to match the 81 | location of your Java installation." 82 | fi 83 | else 84 | JAVACMD="java" 85 | which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 86 | 87 | Please set the JAVA_HOME variable in your environment to match the 88 | location of your Java installation." 89 | fi 90 | 91 | # Increase the maximum file descriptors if we can. 92 | if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then 93 | MAX_FD_LIMIT=`ulimit -H -n` 94 | if [ $? -eq 0 ] ; then 95 | if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then 96 | MAX_FD="$MAX_FD_LIMIT" 97 | fi 98 | ulimit -n $MAX_FD 99 | if [ $? -ne 0 ] ; then 100 | warn "Could not set maximum file descriptor limit: $MAX_FD" 101 | fi 102 | else 103 | warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT" 104 | fi 105 | fi 106 | 107 | # For Darwin, add options to specify how the application appears in the dock 108 | if $darwin; then 109 | GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\"" 110 | fi 111 | 112 | # For Cygwin, switch paths to Windows format before running java 113 | if $cygwin ; then 114 | APP_HOME=`cygpath --path --mixed "$APP_HOME"` 115 | CLASSPATH=`cygpath --path --mixed "$CLASSPATH"` 116 | JAVACMD=`cygpath --unix "$JAVACMD"` 117 | 118 | # We build the pattern for arguments to be converted via cygpath 119 | ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null` 120 | SEP="" 121 | for dir in $ROOTDIRSRAW ; do 122 | ROOTDIRS="$ROOTDIRS$SEP$dir" 123 | SEP="|" 124 | done 125 | OURCYGPATTERN="(^($ROOTDIRS))" 126 | # Add a user-defined pattern to the cygpath arguments 127 | if [ "$GRADLE_CYGPATTERN" != "" ] ; then 128 | OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)" 129 | fi 130 | # Now convert the arguments - kludge to limit ourselves to /bin/sh 131 | i=0 132 | for arg in "$@" ; do 133 | CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -` 134 | CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option 135 | 136 | if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition 137 | eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"` 138 | else 139 | eval `echo args$i`="\"$arg\"" 140 | fi 141 | i=$((i+1)) 142 | done 143 | case $i in 144 | (0) set -- ;; 145 | (1) set -- "$args0" ;; 146 | (2) set -- "$args0" "$args1" ;; 147 | (3) set -- "$args0" "$args1" "$args2" ;; 148 | (4) set -- "$args0" "$args1" "$args2" "$args3" ;; 149 | (5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;; 150 | (6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;; 151 | (7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;; 152 | (8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;; 153 | (9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;; 154 | esac 155 | fi 156 | 157 | # Escape application args 158 | save () { 159 | for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done 160 | echo " " 161 | } 162 | APP_ARGS=$(save "$@") 163 | 164 | # Collect all arguments for the java command, following the shell quoting and substitution rules 165 | eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS" 166 | 167 | # by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong 168 | if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then 169 | cd "$(dirname "$0")" 170 | fi 171 | 172 | exec "$JAVACMD" "$@" 173 | -------------------------------------------------------------------------------- /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 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # FixedTabScrollView 2 | **FixedTabScrollView**是一个scrollView+ViewPager 并实现自动顶吸，固定顶部控件，动态计算Viewpager控件高度的 一个解决方式的Demo （这个Demo应该可以给大家提供一种解决问题的思路，希望能帮助到大家） 3 | 4 | [点击进入项目地址](https://github.com/dafaWang/FixedTabScrollView) 5 | 6 | 实际效果: 7 | 8 | ![image](xiaoguo.gif) 9 | 10 | ## 需求和问题： 11 | 12 | 在实际项目中我们常常会碰到这样的需求，scrollView包裹ViewPager，ViewPager包裹Fragment， 13 | 在scrollView向上滑动时，会把ViewPager的选择Tab栏固定在顶部。 14 | 但是在scrollView包裹ViewPager是的高度计算问题也很让人头疼，而且如果突然有个需求，让你想做一个像翻页一样的效果，展示出来就像ViewPager占了一页，这个应该怎么做呢？ 15 | 16 | ## 自定义ScrollView 17 | 18 | 既然是要在scrollView滑动时候做一些操作，那么我们就需要监听scrollView的滑动事件，但是原生控件没有将 onScrollChanged（）对外开放，所以我们需要自定义一个ScrollView,并且将滑动事件暴露出去 19 | 20 | ```java 21 | public class HoldTabScrollView extends ScrollView { 22 | private Scroller mScroller; 23 | 24 | public HoldTabScrollView(Context context) { 25 | this(context, null); 26 | mScroller = new Scroller(context); 27 | } 28 | 29 | public HoldTabScrollView(Context context, AttributeSet attrs) { 30 | this(context, attrs, 0); 31 | mScroller = new Scroller(context); 32 | } 33 | 34 | public HoldTabScrollView(Context context, AttributeSet attrs, int defStyleAttr) { 35 | super(context, attrs, defStyleAttr); 36 | mScroller = new Scroller(context); 37 | } 38 | 39 | //调用此方法滚动到目标位置 duration滚动时间 40 | public void smoothScrollToSlow(int fx, int fy, int duration) { 41 | int dx = fx - getScrollX();//mScroller.getFinalX(); 普通view使用这种方法 42 | int dy = fy - getScrollY(); //mScroller.getFinalY(); 43 | smoothScrollBySlow(dx, dy, duration); 44 | } 45 | 46 | //调用此方法设置滚动的相对偏移 47 | public void smoothScrollBySlow(int dx, int dy, int duration) { 48 | 49 | //设置mScroller的滚动偏移量 50 | mScroller.startScroll(getScrollX(), getScrollY(), dx, dy, duration);//scrollView使用的方法（因为可以触摸拖动） 51 | // mScroller.startScroll(mScroller.getFinalX(), mScroller.getFinalY(), dx, dy, duration); //普通view使用的方法 52 | invalidate();//这里必须调用invalidate()才能保证computeScroll()会被调用，否则不一定会刷新界面，看不到滚动效果 53 | } 54 | 55 | @Override 56 | public void computeScroll() { 57 | //先判断mScroller滚动是否完成 58 | if (mScroller.computeScrollOffset()) { 59 | 60 | //这里调用View的scrollTo()完成实际的滚动 61 | scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); 62 | 63 | //必须调用该方法，否则不一定能看到滚动效果 64 | postInvalidate(); 65 | } 66 | super.computeScroll(); 67 | } 68 | 69 | private OnHoldTabScrollViewScrollChanged mOnObservableScrollViewScrollChanged; 70 | 71 | public void setOnObservableScrollViewScrollChanged(OnHoldTabScrollViewScrollChanged mOnObservableScrollViewScrollChanged) { 72 | this.mOnObservableScrollViewScrollChanged = mOnObservableScrollViewScrollChanged; 73 | } 74 | 75 | 76 | public interface OnHoldTabScrollViewScrollChanged { 77 | void onObservableScrollViewScrollChanged(int l, int t, int oldl, int oldt); 78 | } 79 | 80 | /** 81 | * @param l Current horizontal scroll origin. 当前滑动的x轴距离 82 | * @param t Current vertical scroll origin. 当前滑动的y轴距离 83 | * @param oldl Previous horizontal scroll origin. 上一次滑动的x轴距离 84 | * @param oldt Previous vertical scroll origin. 上一次滑动的y轴距离 85 | */ 86 | @Override 87 | protected void onScrollChanged(int l, int t, int oldl, int oldt) { 88 | super.onScrollChanged(l, t, oldl, oldt); 89 | if (mOnObservableScrollViewScrollChanged != null) { 90 | mOnObservableScrollViewScrollChanged.onObservableScrollViewScrollChanged(l, t, oldl, oldt); 91 | } 92 | } 93 | 94 | @Override 95 | public void fling(int velocityY) { 96 | // super.fling(velocityY / 1000); 97 | } 98 | } 99 | ``` 100 | 101 | 这样一来，在我们使用HoldTabScrollView的时候，通过setOnObservableScrollViewScrollChanged可以设置一个滑动监听，以此来对其滑动过程中做一些操作。 102 | 103 | ## 修改布局 104 | 105 | 固定View的原理就是在顶部创建一个同View高度相同的父容器，在View滑动上去的时候，移除掉原来的View，并且将此View添加到顶部父容器中，，同理，在View滑动下来的时候，移除，顶部父容器中的View，并将此View添加到原父容器中。 106 | 107 | 108 | ![image](1.png) 109 | 110 | 我们来修改一下布局： 111 | 112 | ```java 113 | 114 | 115 | 118 | 119 | 123 | 124 | 128 | 129 | 136 | 137 | 141 | 142 | 150 | 151 | 152 | 153 | 158 | 159 | 160 | 161 | 165 | 166 | 167 | 168 | ``` 169 | 170 | ## 解决ScrollView 嵌套ViewPager高度计算问题 171 | 172 | 可以看到布局中有一个CustomScrollViewPager 这个ViewPager可以动态的计算它所包裹的Fragment的高度，并将这个实时计算的高度来设置ViewPager 173 | 174 | ```java 175 | public class CustomScrollViewPager extends ViewPager { 176 | private int current; 177 | private int height = 0; 178 | /** 179 | * 保存position与对于的View 180 | */ 181 | private HashMap mChildrenViews = new LinkedHashMap(); 182 | 183 | private boolean scrollble = true; 184 | 185 | public CustomScrollViewPager(Context context) { 186 | super(context); 187 | } 188 | 189 | public CustomScrollViewPager(Context context, AttributeSet attrs) { 190 | super(context, attrs); 191 | } 192 | 193 | 194 | @Override 195 | protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 196 | if (mChildrenViews.size() > current) { 197 | View child = mChildrenViews.get(current); 198 | child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED)); 199 | height = child.getMeasuredHeight(); 200 | } 201 | 202 | heightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.EXACTLY); 203 | 204 | super.onMeasure(widthMeasureSpec, heightMeasureSpec); 205 | } 206 | 207 | public void resetHeight(int current) { 208 | this.current = current; 209 | if (mChildrenViews.size() > current) { 210 | 211 | LinearLayout.LayoutParams layoutParams = (LinearLayout.LayoutParams) getLayoutParams(); 212 | if (layoutParams == null) { 213 | layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, height); 214 | } else { 215 | layoutParams.height = height; 216 | } 217 | setLayoutParams(layoutParams); 218 | } 219 | } 220 | 221 | /** 222 | * 保存position与对于的View 223 | */ 224 | public void setObjectForPosition(View view, int position) { 225 | mChildrenViews.put(position, view); 226 | } 227 | 228 | 229 | @Override 230 | public boolean onTouchEvent(MotionEvent ev) { 231 | if (!scrollble) { 232 | return true; 233 | } 234 | return super.onTouchEvent(ev); 235 | } 236 | 237 | 238 | public boolean isScrollble() { 239 | return scrollble; 240 | } 241 | 242 | public void setScrollble(boolean scrollble) { 243 | this.scrollble = scrollble; 244 | } 245 | 246 | } 247 | ``` 248 | 249 | 我们在创建ViewPager中的Fragment实例的时候需要通过构造函数将这个ViewPager传进去 250 | 251 | ```java 252 | mFragments.add(new Fragment1(viewPager)); 253 | mFragments.add(new Fragment2(viewPager)); 254 | ``` 255 | 256 | 在Fragment中 调用↓来重新计算内部高度并设置ViewPager（第二个参数标识当前fragment在ViewPager中的位置） 257 | ```java 258 | viewPager.setObjectForPosition(view,0); 259 | ``` 260 | 261 | ## 计算需要被固定的控件的位置 262 | 263 | 因为我们在监听scrollView滚动的时候需要知道，滚动到哪个地方就移除原tab，添加新tab，所以我们需要知道原来的控件位置， 264 | 我们在onWindowFocusChanged方法中去获取 265 | ```java 266 | @Override 267 | public void onWindowFocusChanged(boolean hasFocus) { 268 | super.onWindowFocusChanged(hasFocus); 269 | if (hasFocus) { 270 | //获取HeaderView的高度，当滑动大于等于这个高度的时候，需要把tabView移除当前布局，放入到外层布局 271 | mHeight = centerRl.getTop(); 272 | } 273 | } 274 | ``` 275 | 276 | 根据这个高度来写滑动监听事件 277 | 278 | ```java 279 | @Override 280 | public void onObservableScrollViewScrollChanged(int l, int t, int oldl, int oldt) { 281 | if (t >= mHeight) { 282 | if (tablayout.getParent() != topRl) { 283 | centerRl.removeView(tablayout); 284 | topRl.addView(tablayout); 285 | } 286 | } else { 287 | if (tablayout.getParent() != centerRl) { 288 | topRl.removeView(tablayout); 289 | centerRl.addView(tablayout); 290 | } 291 | } 292 | } 293 | ``` 294 | 295 | 296 | ## 自动顶吸效果 297 | 298 | 自动顶吸的效果就是 用户向上滑动一点距离，页面自动滑动到scrollView固定的空间位置，完全展示viewPager中的内容。 299 | 300 | 我们使用ScrollView的ScrollTo来实现，不过因为这个方法滚动速度太快，我们需要对速度做一些处理并且禁用惯性滚动 301 | 302 | ### 对滚动速度的处理我们使用Scroller这个对象，在自定义ScrollView中： 303 | 304 | ```java 305 | //调用此方法滚动到目标位置 duration滚动时间 306 | public void smoothScrollToSlow(int fx, int fy, int duration) { 307 | int dx = fx - getScrollX();//mScroller.getFinalX(); 普通view使用这种方法 308 | int dy = fy - getScrollY(); //mScroller.getFinalY(); 309 | smoothScrollBySlow(dx, dy, duration); 310 | } 311 | 312 | //调用此方法设置滚动的相对偏移 313 | public void smoothScrollBySlow(int dx, int dy, int duration) { 314 | 315 | //设置mScroller的滚动偏移量 316 | mScroller.startScroll(getScrollX(), getScrollY(), dx, dy, duration);//scrollView使用的方法（因为可以触摸拖动） 317 | // mScroller.startScroll(mScroller.getFinalX(), mScroller.getFinalY(), dx, dy, duration); //普通view使用的方法 318 | invalidate();//这里必须调用invalidate()才能保证computeScroll()会被调用，否则不一定会刷新界面，看不到滚动效果 319 | } 320 | ``` 321 | 322 | ### 禁用惯性滚动 323 | 324 | ```java 325 | @Override 326 | public void fling(int velocityY) { 327 | //此处不进行任何操作就可以了 328 | } 329 | ``` 330 | 331 | 332 | ### 修改activity中滑动监听 333 | 334 | ```java 335 | @Override 336 | public void onObservableScrollViewScrollChanged(int l, int t, int oldl, int oldt) { 337 | if (t >= mHeight) { 338 | if (tablayout.getParent() != topRl) { 339 | centerRl.removeView(tablayout); 340 | topRl.addView(tablayout); 341 | canJump = false; 342 | } 343 | } else { 344 | if (tablayout.getParent() != centerRl) { 345 | topRl.removeView(tablayout); 346 | centerRl.addView(tablayout); 347 | canJump = true; 348 | } 349 | } 350 | if (canJump && t >= oldt) { 351 | scrollView.smoothScrollToSlow(0, mHeight, 300); 352 | } else if (canJump && t < oldt) { 353 | scrollView.smoothScrollToSlow(0, 0, 300); 354 | } 355 | } 356 | ``` 357 | 我们添加了一个布尔类型的判断标识，如果为true的时候就开启自动吸顶（ViewPager没有占满一页的时候），为false的时候关闭自动吸顶。 358 | 利用ScrollView中自定义的smoothScrollToSlow方法来滑动到指定位置，最后一个参数可以调节滑动速度。 359 | 360 | 361 | 362 | 整套实现方式的关键代码都在这里了，具体的代码欢迎去顶部github地址下载跑一遍看看 363 | --------------------------------------------------------------------------------