This code was working fine before but now i get null pointer exception on the button
import kotlinx.android.synthetic.main.activity_splash.*
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_splash)
button_splash_getting_started.setOnClickListener {
val intent = Intent(this#SplashActivity, RegisterActivity::class.java)
intent.putExtra("FROM_SPLASH_ACTIVITY",true)
startActivity(intent)
}
textView_splash_already_have_account.setOnClickListener {
val loginIntent = Intent(this#SplashActivity, LoginActivity::class.java)
loginIntent.putExtra("FROM_SPLASH_ACTIVITY",true)
startActivity(loginIntent)
}
}
error
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
and here is logcat
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.edubaba.howApp/com.test.ui.SplashActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2778)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1589)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6494)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
at com.edubaba.howApp.ui.splash.SplashActivity.onCreate(SplashActivity.kt:35)
at android.app.Activity.performCreate(Activity.java:7009)
at android.app.Activity.performCreate(Activity.java:7000)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1214)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2731)
here is the xml file
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_splash_root_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:tag="customsnackbar">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/activity_splash_constraintLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<ImageView
android:id="#+id/imageView_splash_background"
android:layout_width="0dp"
android:layout_height="0dp"
android:scaleType="centerCrop"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/how_background" />
</androidx.constraintlayout.widget.ConstraintLayout>
<TextView
android:id="#+id/activity_splash_skip_text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="32dp"
android:layout_marginEnd="32dp"
android:padding="20dp"
android:text="#string/skip"
android:textColor="#color/white"
android:textSize="18sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ProgressBar
android:id="#+id/activity_splash_progress_bar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:theme="#style/progressBarWhite"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/button_splash_getting_started"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="32dp"
android:layout_marginEnd="32dp"
android:layout_marginBottom="16dp"
android:background="#drawable/background_button_getting_started"
android:text="#string/get_started"
android:textColor="#ec975d"
android:textSize="18sp"
app:layout_constraintBottom_toTopOf="#+id/textView_splash_already_have_account"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
tools:layout_editor_absoluteY="798dp" />
<TextView
android:id="#+id/textView_splash_already_have_account"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="128dp"
android:text="#string/already_signed"
android:textColor="#color/white"
android:translationZ="1dp"
app:layout_constraintBottom_toBottomOf="#+id/activity_splash_constraintLayout"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
Can anyone tell what could have possibly gone wrong?
This id button_splash_getting_started Doesn't exist on your Xml that's why you getting error.
Replace this id button_splash_getting_started with this button_splash_getting_started1.
That's it .
I think I found the problem. In onCreate() method you have:
setContentView(R.layout.activity_splash)
But your .xml file have id:
android:id="#+id/activity_splash_root_layout"
So, I think you need replace to setContentView() right id="".
For example:
setContentView(R.id.activity_splash_root_layout)
Related
I need to update a list as the user chooses which list to see. I created two items to the TabLayout and I'm trying to get the clik winds but I always get an error.
<com.google.android.material.tabs.TabLayout
android:id="#+id/select_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:tabContentStart="32dp"
app:tabMode="scrollable">
<com.google.android.material.tabs.TabItem
android:id="#+id/posto1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Posto Shell" />
<com.google.android.material.tabs.TabItem
android:id="#id/posto2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Posto Guanabara" />
</com.google.android.material.tabs.TabLayout>
The error:
java.lang.NullPointerException: Attempt to invoke virtual method 'void com.google.android.material.tabs.TabItem.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
My app fails to start because of Error inflating class ImageButton, Because of this the phone says "app has stopped" Etc.
I am using firebase test lab to debug the problem
the Errors occur on samsung devices specifically A20, s7 Edge , s7(tested with firebase same problem)
I am new to android and have tried many solutions from google and SO none have worked sofar
Here is the error report on firebase
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.smartpractice.smartpracticesmartapp/com.smartpractice.myapplication.MainActivity}: android.view.InflateException: Binary XML file line #117: Binary XML file line #117: Error inflating class ImageButton
FATAL EXCEPTION: main
Process: com.smartpractice.smartpracticesmartapp, PID: 26921
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.smartpractice.smartpracticesmartapp/com.smartpractice.myapplication.MainActivity}: android.view.InflateException: Binary XML file line #117: Binary XML file line #117: Error inflating class ImageButton
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3253)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3349)
at android.app.ActivityThread.access$1100(ActivityThread.java:221)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1794)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7224)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: android.view.InflateException: Binary XML file line #117: Binary XML file line #117: Error inflating class ImageButton
at android.view.LayoutInflater.inflate(LayoutInflater.java:551)
at android.view.LayoutInflater.inflate(LayoutInflater.java:429)
at android.view.LayoutInflater.inflate(LayoutInflater.java:380)
at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:469)
at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.smartpractice.myapplication.MainActivity.onCreate(MainActivity.java:14)
at android.app.Activity.performCreate(Activity.java:6876)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1135)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3206)
... 9 more
Caused by: android.view.InflateException: Binary XML file line #117: Error inflating class ImageButton
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:794)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:716)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:847)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:810)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:855)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:810)
at android.view.LayoutInflater.inflate(LayoutInflater.java:527)
... 17 more
Caused by: android.content.res.Resources$NotFoundException: Resource ID #0x7f070089
at android.content.res.Resources.getValue(Resources.java:2558)
at androidx.appcompat.widget.AppCompatDrawableManager.loadDrawableFromDelegates(AppCompatDrawableManager.java:331)
at androidx.appcompat.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:198)
at androidx.appcompat.widget.AppCompatDrawableManager.getDrawable(AppCompatDrawableManager.java:191)
at androidx.appcompat.content.res.AppCompatResources.getDrawable(AppCompatResources.java:102)
at androidx.appcompat.widget.AppCompatImageHelper.loadFromAttributes(AppCompatImageHelper.java:59)
at androidx.appcompat.widget.AppCompatImageButton.<init>(AppCompatImageButton.java:79)
at androidx.appcompat.widget.AppCompatImageButton.<init>(AppCompatImageButton.java:69)
at androidx.appcompat.app.AppCompatViewInflater.createImageButton(AppCompatViewInflater.java:202)
at androidx.appcompat.app.AppCompatViewInflater.createView(AppCompatViewInflater.java:122)
at androidx.appcompat.app.AppCompatDelegateImpl.createView(AppCompatDelegateImpl.java:1266)
at androidx.appcompat.app.AppCompatDelegateImpl.onCreateView(AppCompatDelegateImpl.java:1316)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:758)
Here is the XML
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/relativeLayout4"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/ic_launcher_background"
tools:context=".MainActivity">
<com.google.android.flexbox.FlexboxLayout
android:id="#+id/flexboxLayout"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
app:alignContent="stretch"
app:alignItems="stretch"
app:flexWrap="wrap"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.863"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="#+id/guideline7">
<TextView
android:id="#+id/textView"
android:layout_width="match_parent"
android:layout_height="48dp"
android:fontFamily="#font/nunito"
android:gravity="center_horizontal"
android:text="#string/welcome_to_smartpractice"
android:textSize="24sp"
app:fontFamily="#font/nunito"
app:layout_alignSelf="baseline"
tools:layout_editor_absoluteY="100dp"
tools:targetApi="jelly_bean" />
<TextView
android:id="#+id/textView7"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/colorPrimaryDark"
android:gravity="center_horizontal|fill_vertical"
android:text="#string/docsharesmart"
android:textColor="#color/ic_launcher_background"
app:layout_alignSelf="flex_end"
tools:layout_editor_absoluteY="16dp" />
</com.google.android.flexbox.FlexboxLayout>
<com.google.android.flexbox.FlexboxLayout
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:layout_marginTop="4dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginBottom="8dp"
app:alignContent="center"
app:alignItems="stretch"
app:flexDirection="row"
app:flexWrap="nowrap"
app:justifyContent="space_between"
app:layout_constraintBottom_toTopOf="#+id/guideline7"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<ImageView
android:id="#+id/imageView3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:contentDescription="#string/logo1"
app:layout_alignSelf="center"
app:srcCompat="#drawable/smartpractice_logo_02"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="-46dp" />
<ImageButton
android:id="#+id/LoginScreen"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#null"
android:contentDescription="#string/loginscreen"
app:layout_alignSelf="center"
app:layout_wrapBefore="false"
app:srcCompat="#drawable/ic_more_vert_black_24dp"
tools:layout_editor_absoluteX="248dp"
tools:layout_editor_absoluteY="134dp" />
</com.google.android.flexbox.FlexboxLayout>
<com.google.android.flexbox.FlexboxLayout
android:id="#+id/flexboxLayout2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:layout_marginBottom="8dp"
app:alignContent="stretch"
app:alignItems="stretch"
app:flexWrap="wrap"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/flexboxLayout"
app:layout_constraintVertical_bias="0.146">
Here is line 117 from the error
<ImageButton
android:id="#+id/UploadButton"
android:layout_width="300dp"
android:layout_height="209dp"
android:background="#android:color/transparent"
app:layout_constraintTop_toBottomOf="#+id/flexboxLayout"
app:srcCompat="#drawable/upload_files_upload"
android:contentDescription="#string/todo" />
</com.google.android.flexbox.FlexboxLayout>
<androidx.constraintlayout.widget.Guideline
android:id="#+id/guideline7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
app:layout_constraintGuide_begin="185dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
It means upload_files_upload is not found in drawble folder, well this can be a case, where your file may present in drawable-24 but not in drawble folder, in that case this problem still arise. The point is your file must be in all drawble folder.
The reason for your error is that the upload_files_upload is not in your drawable folder :
<ImageButton
android:id="#+id/UploadButton"
android:layout_width="300dp"
android:layout_height="209dp"
android:background="#android:color/transparent"
app:layout_constraintTop_toBottomOf="#+id/flexboxLayout"
app:srcCompat="#drawable/upload_files_upload"// this line
android:contentDescription="#string/todo" />
I have solved The Issue I changed app:srcCompat="#drawable/upload_files_upload"// to android:src="#drawable/upload_files_upload"
So the problem was by app:srcCompat I changed it to Android:src and it works fine now
I am going through the android studio 3.0 development essentials Kotlin edition book and am having a problem.
The app crashes and inside the logcat it is saying "Unknown scene name: transitionManager"
I simply don't understand simple errors like this yet since I am new, hopefully someone can help me solve this error.
I am following every step in the book and double checked, so I am guessing this is a error inside the book? or the book is getting old
package com.ebookfrenzy.scenetransitions
import android.os.Build
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.support.annotation.RequiresApi
import android.transition.Scene
import android.view.View
import android.transition.TransitionManager
import android.transition.TransitionInflater
import android.transition.Transition
import kotlinx.android.synthetic.main.activity_scene_transitions.*
class SceneTransitionsActivity : AppCompatActivity() {
var scene1: Scene? = null
var scene2: Scene? = null
var transitionMgr: Transition? = null
#RequiresApi(Build.VERSION_CODES.KITKAT)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_scene_transitions)
transitionMgr = TransitionInflater.from(this)
.inflateTransition(R.transition.transition)
scene1 = Scene.getSceneForLayout(rootContainer,
R.layout.scene1_layout, this)
scene2 = Scene.getSceneForLayout(rootContainer,
R.layout.scene2_layout, this)
scene1?.enter()
}
fun goToScene2(view: View) {
TransitionManager.go(scene2, transitionMgr)
}
fun goToScene1(view: View) {
TransitionManager.go(scene1, transitionMgr)
}
}
Logcat
08-14 14:18:25.920 30350-30350/com.ebookfrenzy.scenetransitions E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.ebookfrenzy.scenetransitions, PID: 30350
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ebookfrenzy.scenetransitions/com.ebookfrenzy.scenetransitions.SceneTransitionsActivity}: java.lang.RuntimeException: Unknown scene name: transitionManager
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2957)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6940)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: java.lang.RuntimeException: Unknown scene name: transitionManager
at android.transition.TransitionInflater.createTransitionFromXml(TransitionInflater.java:181)
at android.transition.TransitionInflater.inflateTransition(TransitionInflater.java:79)
at com.ebookfrenzy.scenetransitions.SceneTransitionsActivity.onCreate(SceneTransitionsActivity.kt:27)
at android.app.Activity.performCreate(Activity.java:7174)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1220)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2910)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3032)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1696)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6940)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
08-14 14:18:25.994 30350-30406/com.ebookfrenzy.scenetransitions I/vndksupport: sphal namespace is not configured for this process. Loading /vendor/lib64/egl/libGLESv2_adreno.so from the current namespace instead.
08-14 14:18:25.999 30350-30406/com.ebookfrenzy.scenetransitions D/libEGL: loaded /vendor/lib64/egl/libGLESv2_adreno.so
Project XML's
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/rootContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.ebookfrenzy.scenetransitions.SceneTransitionsActivity">
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:onClick="goToScene2"
android:text="#string/one"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:layout_marginTop="16dp"
android:onClick="goToScene1"
android:text="#string/two"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/three"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout_editor_absoluteY="81dp">
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="19dp"
android:layout_marginEnd="16dp"
android:layout_marginRight="16dp"
android:onClick="goToScene2"
android:text="#string/one"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
<Button
android:id="#+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="19dp"
android:layout_marginLeft="16dp"
android:layout_marginStart="16dp"
android:onClick="goToScene1"
android:text="#string/two"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</android.support.constraint.ConstraintLayout>
<?xml version="1.0" encoding="utf-8"?>
<transitionManager xmlns:android="http://schemas.android.com/apk/res/android">
<changeBounds
android:duration="2000">
</changeBounds>
</transitionManager>
For some reason my XML was:
<?xml version="1.0" encoding="utf-8"?>
<transitionManager xmlns:android="http://schemas.android.com/apk/res/android">
<changeBounds
android:duration="2000">
</changeBounds>
</transitionManager>
and was supposed to be
<?xml version="1.0" encoding="utf-8"?>
<transitionSet xmlns:android="http://schemas.android.com/apk/res/android">
<changeBounds
android:duration="2000">
</changeBounds>
</transitionSet>
I don't know why when I created the file the name was "transitionManager", but the change to "transitionSet" is what corrected the problem.
So I think I'm having some scoping issues.
I'm trying to use the function setZipEdit to set the R.id.zipHolder editText in my activity. I'm just having issues in setting up the code to be able to do this. Below is what I have which isn't currently working. mZipHold is coming back as not initialized which I though it was in the override
UPDATED
class SecondActivity : AppCompatActivity() {
lateinit var townInfo:JsonArray<JsonObject>
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity2)
SET_TOWN.setOnClickListener {v -> setTowns()}
GET_TOWNS.setOnClickListener {v -> retrieveTowns()}
}
fun setZipEdit(zipEdit:String){
Log.d("SZE",zipEdit)
zipHolder.setText(zipEdit)
//mZipHold.setText(zipEdit,TextView.BufferType.EDITABLE)
}
java.lang.NullPointerException: Attempt to invoke virtual method
'android.view.Window$Callback android.view.Window.getCallback()' on a
null object reference
at
android.support.v7.app.AppCompatDelegateImplBase.(AppCompatDelegateImplBase.java:117)
at
android.support.v7.app.AppCompatDelegateImplV9.(AppCompatDelegateImplV9.java:149)
at
android.support.v7.app.AppCompatDelegateImplV11.(AppCompatDelegateImplV11.java:29)
at
android.support.v7.app.AppCompatDelegateImplV14.(AppCompatDelegateImplV14.java:54)
at
android.support.v7.app.AppCompatDelegateImplV23.(AppCompatDelegateImplV23.java:31)
at
android.support.v7.app.AppCompatDelegateImplN.(AppCompatDelegateImplN.java:31)
at
android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:198)
at
android.support.v7.app.AppCompatDelegate.create(AppCompatDelegate.java:183)
at
android.support.v7.app.AppCompatActivity.getDelegate(AppCompatActivity.java:519)
at
android.support.v7.app.AppCompatActivity.findViewById(AppCompatActivity.java:190)
at
com.example.sdfsdf.listview.SecondActivity._$_findCachedViewById(SecondActivity.kt:0)
at
com.example.sdfsdf.listview.SecondActivity.setZipEdit(SecondActivity.kt:44)
at
com.example.sdfsdf.listview.SecondActivity$MyCustomAdapter$onCreateViewHolder$1.onClick(SecondActivity.kt:124)
at android.view.View.performClick(View.java:6256)
at android.view.View$PerformClick.run(View.java:24697)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at
com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
XML
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFFF"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="25dp">
<ImageView
android:id="#+id/returnimage"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_marginStart="8dp"
android:layout_marginTop="20dp"
android:contentDescription="logoforZip"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/ic_new_icon_plain" />
<EditText
android:id="#+id/zipHolder"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="10dp"
android:layout_marginStart="8dp"
android:layout_marginTop="20dp"
android:ems="10"
android:inputType="number"
android:text="ZIP HERE"
android:textAlignment="center"
android:textColor="#000000"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/returnimage"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/SET_TOWN"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_marginTop="8dp"
android:text="SET TOWN"
app:layout_constraintEnd_toEndOf="#+id/zipHolder"
app:layout_constraintStart_toStartOf="#+id/zipHolder"
app:layout_constraintTop_toBottomOf="#+id/zipHolder" />
<Button
android:id="#+id/GET_TOWNS"
android:layout_width="0dp"
android:layout_height="50dp"
android:layout_marginTop="8dp"
android:text="LIST NEARBY TOWNS"
app:layout_constraintEnd_toEndOf="#+id/SET_TOWN"
app:layout_constraintStart_toStartOf="#+id/SET_TOWN"
app:layout_constraintTop_toBottomOf="#+id/SET_TOWN" />
<View
android:id="#+id/splitbar"
android:layout_width="fill_parent"
android:layout_height="6dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:background="#c0c0c0"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/GET_TOWNS" />
<android.support.v7.widget.RecyclerView
android:id="#+id/zipList"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:background="#222222"
android:scrollbars="vertical"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/splitbar" />
</android.support.constraint.ConstraintLayout>
Ok, But using kotlinextension is a better way to do this, I think you need to do 2 things may solve your problem
first
import kotlinx.android.synthetic.main.activity_main2.*
I think which you have already done
second instead of initializing your Editext by findViewById direct use as
fun setZipEdit(zipEdit:String){
Log.d("SZE",zipEdit)
Log.d("mzh",mZipHold.toString())
zipHolder.setText(zipEdit)
//mZipHold.setText(zipEdit,TextView.BufferType.EDITABLE)
}
you can access your views by only use their id. Let try this and let me know if works
I keep getting a java.lang.NullPointerException when I try to use ScrollView in an activity.
The weird thing is that I've used the exact same Scrollview setup in other activities. And all of a sudden I'm getting errors. I've tried cleaning the project and rebuilding.
And I've tried the good old restart the program. I learned a lot about Null Pointer Exceptions today, but I haven't been able to figure out why I keep getting Rendering Problems.
This is the java.lang.NullPointerException that is thrown on the XML:
java.lang.NullPointerException
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:738)
at android.view.BridgeInflater.createViewFromTag(BridgeInflater.java:149)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:835)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:811)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:838)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:811)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.rInflate_Original(LayoutInflater.java:838)
at android.view.LayoutInflater_Delegate.rInflate(LayoutInflater_Delegate.java:70)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:811)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:394)
at com.android.layoutlib.bridge.impl.RenderSessionImpl.inflate(RenderSessionImpl.java:223)
at com.android.layoutlib.bridge.Bridge.createSession(Bridge.java:426)
at com.android.ide.common.rendering.LayoutLibrary.createSession(LayoutLibrary.java:350)
at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:510)
at com.android.tools.idea.rendering.RenderTask$2.compute(RenderTask.java:498)
at com.intellij.openapi.application.impl.ApplicationImpl.runReadAction(ApplicationImpl.java:888)
at com.android.tools.idea.rendering.RenderTask.createRenderSession(RenderTask.java:498)
at com.android.tools.idea.rendering.RenderTask.access$600(RenderTask.java:72)
at com.android.tools.idea.rendering.RenderTask$3.call(RenderTask.java:610)
at com.android.tools.idea.rendering.RenderTask$3.call(RenderTask.java:607)
at com.android.tools.idea.rendering.RenderService.runRenderAction(RenderService.java:362)
at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:607)
at com.android.tools.idea.rendering.RenderTask.render(RenderTask.java:629)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.doRender(AndroidLayoutPreviewToolWindowManager.java:652)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager.access$1700(AndroidLayoutPreviewToolWindowManager.java:80)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$7$1.run(AndroidLayoutPreviewToolWindowManager.java:594)
at com.intellij.openapi.progress.impl.CoreProgressManager$2.run(CoreProgressManager.java:152)
at com.intellij.openapi.progress.impl.CoreProgressManager.registerIndicatorAndRun(CoreProgressManager.java:452)
at com.intellij.openapi.progress.impl.CoreProgressManager.executeProcessUnderProgress(CoreProgressManager.java:402)
at com.intellij.openapi.progress.impl.ProgressManagerImpl.executeProcessUnderProgress(ProgressManagerImpl.java:54)
at com.intellij.openapi.progress.impl.CoreProgressManager.runProcess(CoreProgressManager.java:137)
at org.jetbrains.android.uipreview.AndroidLayoutPreviewToolWindowManager$7.run(AndroidLayoutPreviewToolWindowManager.java:589)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:320)
at com.intellij.util.ui.update.MergingUpdateQueue.execute(MergingUpdateQueue.java:310)
at com.intellij.util.ui.update.MergingUpdateQueue$2.run(MergingUpdateQueue.java:254)
at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:269)
at com.intellij.util.ui.update.MergingUpdateQueue.flush(MergingUpdateQueue.java:227)
at com.intellij.util.ui.update.MergingUpdateQueue.run(MergingUpdateQueue.java:217)
at com.intellij.util.concurrency.QueueProcessor.runSafely(QueueProcessor.java:238)
at com.intellij.util.Alarm$Request$1.run(Alarm.java:351)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
So, none of this is code that I wrote. So I dove into the stack trace and found this:
java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:715)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:806)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:809)
at android.view.LayoutInflater.inflate(LayoutInflater.java:504)
at android.view.LayoutInflater.inflate(LayoutInflater.java:414)
at android.view.LayoutInflater.inflate(LayoutInflater.java:365)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:378)
at android.app.Activity.setContentView(Activity.java:2145)
at com.mitchellpalermo.tutroubleshooting.ContactPage.onCreate(ContactPage.java:11)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Which points to line 11 on the Contact.java file. Which looks like this (I've put indicators around line 11) :
package com.mitchellpalermo.tutroubleshooting;
import android.app.Activity;
import android.os.Bundle;
public class Contact extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_contact); // line 11
}
}
I don't see a problem with line 11.
Now, I can't figure out what is wrong with my code. Between Rendering Problems and NullPointerExceptions, I can't figure out what is actually wrong with my code.
This is an example of XML in an activity in which the ScrollView doesn't throw any errors:
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
tools:context="com.mitchellpalermo.tutroubleshooting.ComputerOrProjector">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:orientation="vertical">
<TextView
style="#style/HeaderStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="#string/solutions"
android:textStyle="bold" />
<!-- A CardView that contains a TextView -->
<android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="15dp"
card_view:cardBackgroundColor="#FFFFFF"
card_view:cardCornerRadius="4dp"
card_view:cardElevation="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
style="#style/Solution"
android:text="#string/pc_v_fifth" />
<View
android:layout_width="match_parent"
android:layout_height="2dp"
android:background="#android:color/darker_gray" />
<TextView
style="#style/Solution"
android:text="#string/pc_v_first" />
<View
android:layout_width="match_parent"
android:layout_height="2dp"
android:background="#android:color/darker_gray" />
<TextView
style="#style/Solution"
android:text="#string/pc_v_second" />
<View
android:layout_width="match_parent"
android:layout_height="2dp"
android:background="#android:color/darker_gray" />
<TextView
style="#style/Solution"
android:text="#string/pc_v_third" />
<View
android:layout_width="match_parent"
android:layout_height="2dp"
android:background="#android:color/darker_gray" />
<TextView
style="#style/Solution"
android:text="#string/pc_v_fourth" />
<View
android:layout_width="match_parent"
android:layout_height="2dp"
android:background="#android:color/darker_gray" />
</LinearLayout>
</android.support.v7.widget.CardView>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
style="#style/NextButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:onClick="sendEmail"
android:text="#string/fixed"
android:textStyle="bold" />
<Button
style="#style/NextButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:onClick="notFixedButton"
android:text="#string/not_fixed"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
</ScrollView>
And here is the activity in which I receive errors:
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:fillViewport="false">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
style="#style/HeaderStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="#string/still_not_fixed" />
<!-- A CardView that contains a TextView -->
<android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="15dp"
card_view:cardBackgroundColor="#FFFFFF"
card_view:cardCornerRadius="4dp"
card_view:cardElevation="5dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/hector" />
<view
android:layout_width="match_parent"
android:layout_height="2dp"
android:backgroundTint="#android:color/darker_gray" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/robert" />
<view
android:layout_width="match_parent"
android:layout_height="2dp"
android:backgroundTint="#android:color/darker_gray" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/mitch" />
</android.support.v7.widget.CardView>
</LinearLayout>
</ScrollView>
Any suggestions? And thank you so much in advance!
Change <view to <View, because view is not about empty view. It's for custom view defined through class attr, like below:
<view
android:layout_width="wrap_content"
android:layout_height="wrap_content"
class="com.your.package.YourCustomView" />
And you got
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
because of LayoutInflater tries to parse class attr:
LayoutInflater source code
//...
View createViewFromTag(View parent, String name, Context context, AttributeSet attrs,
boolean ignoreThemeAttr) {
if (name.equals("view")) { // line 724
name = attrs.getAttributeValue(null, "class"); // line 725
}
// Apply a theme wrapper, if allowed and one is specified.
if (!ignoreThemeAttr) {
final TypedArray ta = context.obtainStyledAttributes(attrs, ATTRS_THEME);
final int themeResId = ta.getResourceId(0, 0);
if (themeResId != 0) {
context = new ContextThemeWrapper(context, themeResId);
}
ta.recycle();
}
if (name.equals(TAG_1995)) { // line 738
// Let's party like it's 1995!
return new BlinkLayout(context, attrs);
}
//...
On line 724 it check that your tag is view and gets true
On line 725 it tries to get class through class attr and gets null
On line 738 it tries to check for blink tag and gets crash
Also, there is a curious thing, Android developers added Easter egg, you can try it:
<view
android:layout_width="wrap_content"
android:layout_height="wrap_content"
class="blink">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Some text" />
</view>
After 2 days I solved this problem use View instead of view
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#faf4f4"></View>