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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 |
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Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.
Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.
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/build |
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plugins { | ||
id 'com.android.library' | ||
id 'kotlin-android' | ||
} | ||
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android { | ||
compileSdk 31 | ||
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defaultConfig { | ||
minSdk 21 | ||
targetSdk 31 | ||
versionCode 1 | ||
versionName "1.0" | ||
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testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner" | ||
consumerProguardFiles "consumer-rules.pro" | ||
} | ||
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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' | ||
} | ||
} | ||
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dependencies { | ||
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implementation 'androidx.core:core-ktx:1.6.0' | ||
implementation 'androidx.appcompat:appcompat:1.3.1' | ||
implementation 'com.google.android.material:material:1.4.0' | ||
testImplementation 'junit:junit:4.+' | ||
androidTestImplementation 'androidx.test.ext:junit:1.1.3' | ||
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0' | ||
} |
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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 | ||
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# 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 *; | ||
#} | ||
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# Uncomment this to preserve the line number information for | ||
# debugging stack traces. | ||
#-keepattributes SourceFile,LineNumberTable | ||
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# If you keep the line number information, uncomment this to | ||
# hide the original source file name. | ||
#-renamesourcefileattribute SourceFile |
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package com.faizzy.collapsingnestedscrollview | ||
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import androidx.test.platform.app.InstrumentationRegistry | ||
import androidx.test.ext.junit.runners.AndroidJUnit4 | ||
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import org.junit.Test | ||
import org.junit.runner.RunWith | ||
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import org.junit.Assert.* | ||
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/** | ||
* 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.faizzy.collapsingnestedscrollview.test", appContext.packageName) | ||
} | ||
} |
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<?xml version="1.0" encoding="utf-8"?> | ||
<manifest xmlns:android="http://schemas.android.com/apk/res/android" | ||
package="com.faizzy.collapsingnestedscrollview"> | ||
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</manifest> |
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package com.faizzy.collapsingnestedscrollview | ||
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import android.content.Context | ||
import android.util.AttributeSet | ||
import android.view.View | ||
import androidx.core.widget.NestedScrollView | ||
import androidx.recyclerview.widget.LinearLayoutManager | ||
import androidx.recyclerview.widget.RecyclerView | ||
import java.util.* | ||
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/** | ||
* Maintain nested scrolling behaviour if child is [RecyclerView] and it has focus to consume scrolling then it will communicate parent to consume | ||
* scroll event until parent scroll is not reached to bottom | ||
*/ | ||
class CollapsingNestedScrollView : NestedScrollView { | ||
constructor(context: Context) : super(context) | ||
constructor(context: Context, attrs: AttributeSet?) : super(context, attrs) | ||
constructor(context: Context, attrs: AttributeSet?, defStyleAttr: Int) : super(context, attrs, defStyleAttr) | ||
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override fun onNestedPreScroll(target: View, dx: Int, dy: Int, consumed: IntArray, type: Int) { | ||
val rv = target as RecyclerView | ||
if (dy < 0 && isRvScrolledToTop(rv) || dy > 0 && !isNsvScrolledToBottom(this)) { | ||
// The NestedScrollView should steal the scroll event away from the | ||
// RecyclerView if: (1) the user is scrolling their finger down and the | ||
// RecyclerView is scrolled to the top of its content, or (2) the user | ||
// is scrolling their finger up and the NestedScrollView is not scrolled | ||
// to the bottom of its content. | ||
scrollBy(0, dy) | ||
consumed[1] = dy | ||
return | ||
} | ||
super.onNestedPreScroll(target, dx, dy, consumed, type) | ||
} | ||
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companion object { | ||
/** | ||
* Returns true if the [NestedScrollView] is scrolled to the bottom | ||
* of its content (i.e. the child is completely expanded). | ||
*/ | ||
private fun isNsvScrolledToBottom(nsv: NestedScrollView): Boolean { | ||
return !nsv.canScrollVertically(1) | ||
} | ||
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/** | ||
* Returns true if the [RecyclerView] is scrolled to the | ||
* top of its content (i.e. its first item is completely visible). | ||
*/ | ||
private fun isRvScrolledToTop(rv: RecyclerView): Boolean { | ||
val lm = rv.layoutManager as LinearLayoutManager? | ||
return (Objects.requireNonNull(lm)!!.findFirstVisibleItemPosition() == 0 | ||
&& Objects.requireNonNull(lm!!.findViewByPosition(0))!!.top == 0) | ||
} | ||
} | ||
} |