migrate from androidx to support

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

README.md

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+# ViewPager2ForSupport
+
+As we know, there still are so many legacy projects using support library so far. ViewPager2 contains
+many useful features, which is better than ViewPager. However, unfortunately, it is exclusively
+for androidx, and support can't use it. In order to use it on legacy support project, I migrate
+androidx.viewpager2:viewpager2:1.0.0 to support version. So you can use it in your support project.
+
+### Usage:
+
+#### Step 1. Add the JitPack repository to your build file
+
+Add it in your root build.gradle at the end of repositories:
+```groovy
+	allprojects {
+		repositories {
+			...
+			maven { url 'https://jitpack.io' }
+		}
+	}
+```
+
+#### Step 2. Add the dependency
+
+```groovy
+	dependencies {
+        implementation 'com.github.VinsonGuo:ViewPager2ForSupport:1.0.0'
+	}
+```
+
+#### Step 3. Use it
+
+```xml
+<com.vinsonguo.viewpager2.widget.ViewPager2
+        android:id="@+id/viewPager2"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+```

app/.gitignore

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+/build

app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'kotlin-android'
+}
+
+android {
+    compileSdk 31
+
+    defaultConfig {
+        applicationId "com.vinsonguo.viewpager2"
+        minSdk 23
+        targetSdk 31
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+}
+
+dependencies {
+
+    implementation 'com.android.support:appcompat-v7:28.0.0'
+    implementation 'com.android.support.constraint:constraint-layout:2.0.4'
+    implementation project(path: ':viewpager2')
+    testImplementation 'junit:junit:4.+'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/com/vinsonguo/viewpager2/ExampleInstrumentedTest.kt

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+package com.vinsonguo.viewpager2
+
+import android.support.test.InstrumentationRegistry
+import android.support.test.runner.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.vinsonguo.viewpager2", appContext.packageName)
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.vinsonguo.viewpager2">
+
+    <application
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.ViewPager2ForSupport">
+        <activity
+            android:name=".demo.MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

app/src/main/java/com/vinsonguo/viewpager2/demo/MainActivity.kt

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+package com.vinsonguo.viewpager2.demo
+
+import android.support.v7.app.AppCompatActivity
+import android.os.Bundle
+import android.support.v4.app.Fragment
+import com.vinsonguo.viewpager2.R
+import com.vinsonguo.viewpager2.adapter.FragmentStateAdapter
+import com.vinsonguo.viewpager2.widget.ViewPager2
+
+class MainActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        val viewPager2 = findViewById<ViewPager2>(R.id.viewPager2)
+//        viewPager2.isUserInputEnabled = false
+//        viewPager2.offscreenPageLimit = 3
+        viewPager2.adapter = object :FragmentStateAdapter(this) {
+            override fun getItemCount() = 10
+            override fun createFragment(position: Int) = TestFragment.newInstance(position)
+
+        }
+    }
+}

app/src/main/java/com/vinsonguo/viewpager2/demo/TestFragment.kt

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+package com.vinsonguo.viewpager2.demo
+
+import android.os.Bundle
+import android.support.v4.app.Fragment
+import android.util.Log
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+
+class TestFragment:Fragment() {
+
+    companion object{
+        fun newInstance(index: Int) = TestFragment().apply {
+            val args = Bundle()
+            args.putInt("index", index)
+            arguments = args
+        }
+    }
+
+    private val TAG by lazy {
+        "TestFragment" + arguments?.getInt("index")
+    }
+
+    private lateinit var tv:TextView
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        Log.d(TAG, "onCreate \n")
+    }
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View? {
+        tv = TextView(context)
+        tv.append("onCreateView \n")
+        Log.d(TAG, "onCreateView \n")
+        return tv
+    }
+
+    override fun onStart() {
+        super.onStart()
+        tv.append("onStart \n")
+        Log.d(TAG, "onStart \n")
+    }
+
+    override fun onResume() {
+        super.onResume()
+        tv.append("onResume \n")
+        Log.d(TAG, "onResume \n")
+    }
+
+    override fun onPause() {
+        super.onPause()
+        tv.append("onPause \n")
+        Log.d(TAG, "onPause \n")
+    }
+
+    override fun onStop() {
+        super.onStop()
+        tv.append("onStop \n")
+        Log.d(TAG, "onStop \n")
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        tv.append("onDestroyView \n")
+        Log.d(TAG, "onDestroyView \n")
+    }
+
+    override fun onDestroy() {
+        super.onDestroy()
+        tv.append("onDestroy \n")
+        Log.d(TAG, "onDestroy \n")
+    }
+}

app/src/main/res/drawable-v24/ic_launcher_foreground.xml

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+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item android:color="#44000000"
+                    android:offset="0.0" />
+                <item android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>