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Error inflating class android.fragment.app.FragmentContainerView, can someone tell me what I'm missing

I'm working on getting the Google Place API to appear within a CardView.
The particular code I'm looking at is from GitHub, seems to be working for everyone else but I don't understand why it's throwing me an error.
This is the error I am getting:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.rizwanqureshi.kevstaxiscanterbury, PID: 6818
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.rizwanqureshi.kevstaxiscanterbury/com.rizwanqureshi.kevstaxiscanterbury.CustomerMapsActivity}: android.view.InflateException: Binary XML file line #50 in com.rizwanqureshi.kevstaxiscanterbury:layout/activity_customer_maps: Binary XML file line #50 in com.rizwanqureshi.kevstaxiscanterbury:layout/activity_customer_maps: Error inflating class android.fragment.app.FragmentContainerView
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3270)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: android.view.InflateException: Binary XML file line #50 in com.rizwanqureshi.kevstaxiscanterbury:layout/activity_customer_maps: Binary XML file line #50 in com.rizwanqureshi.kevstaxiscanterbury:layout/activity_customer_maps: Error inflating class android.fragment.app.FragmentContainerView
Caused by: android.view.InflateException: Binary XML file line #50 in com.rizwanqureshi.kevstaxiscanterbury:layout/activity_customer_maps: Error inflating class android.fragment.app.FragmentContainerView
Caused by: java.lang.ClassNotFoundException: android.fragment.app.FragmentContainerView
at java.lang.Class.classForName(Native Method)
at java.lang.Class.forName(Class.java:454)
at android.view.LayoutInflater.createView(LayoutInflater.java:815)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:1006)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:961)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1123)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1126)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:1126)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:1084)
at android.view.LayoutInflater.inflate(LayoutInflater.java:682)
at android.view.LayoutInflater.inflate(LayoutInflater.java:534)
at android.view.LayoutInflater.inflate(LayoutInflater.java:481)
at com.android.internal.policy.PhoneWindow.setContentView(PhoneWindow.java:438)
at android.app.Activity.setContentView(Activity.java:3324)
at com.rizwanqureshi.kevstaxiscanterbury.CustomerMapsActivity.onCreate(CustomerMapsActivity.java:116)
at android.app.Activity.performCreate(Activity.java:7802)
at android.app.Activity.performCreate(Activity.java:7791)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1299)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3245)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3409)
at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:83)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2016)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
E/AndroidRuntime: at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: java.lang.ClassNotFoundException: Didn't find class "android.fragment.app.FragmentContainerView" on path: DexPathList[[zip file "/data/app/com.rizwanqureshi.kevstaxiscanterbury-Nkg-1mQCfbE8I1MoJKHQuA==/base.apk"],nativeLibraryDirectories=[/data/app/com.rizwanqureshi.kevstaxiscanterbury-Nkg-1mQCfbE8I1MoJKHQuA==/lib/x86, /system/lib, /system/product/lib]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:196)
at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
... 32 more
The main takeaway is that there is an Error inflating class android.fragment.app.FragmentContainerView and that the issue is at line 50 of the XML.
This is the XML:
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".CustomerLogin" >
<androidx.fragment.app.FragmentContainerView
android:id="#+id/map"
android:name="com.google.android.gms.maps.SupportMapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/buttons">
<Button
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="#+id/logout"
android:text="logout"
tools:ignore="ButtonStyle" />
<Button
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="#+id/history"
android:text="history"
tools:ignore="ButtonStyle" />
<Button
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:id="#+id/settings"
android:text="Settings"
tools:ignore="ButtonStyle" />
</LinearLayout>
<androidx.cardview.widget.CardView
android:layout_below="#+id/buttons"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20sp">
//***LINE 50 WHERE THE ERROR IS***
<android.fragment.app.FragmentContainerView
android:id="#+id/place_autocomplete_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:ignore="ExtraText">
android:name="com.google.android.gms.location.places.ui.PlaceAutocompleteFragment"
</android.fragment.app.FragmentContainerView>
</androidx.cardview.widget.CardView>
</RelativeLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_gravity="bottom">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/driverInfo"
android:layout_gravity="bottom"
android:orientation="horizontal"
android:background="#android:color/white"
android:visibility="gone">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingLeft="40sp">
</LinearLayout>
</LinearLayout>
<LinearLayout
android:background="#android:color/white"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</LinearLayout>
</LinearLayout>
</FrameLayout>
So I guess there is something wrong with the FragmentContainerView? But i'm not getting any errors in the code and nothing is coming up on Google.
I feel like maybe something is outdated rather than outright incorrect but I haven't a clue.
Thanks for any input.

just try to define your startDestination in your navigation xml !

You should implement new androidx.fragment dependencies to use FragmentContainerView. It is already added since version 1.2.0. You can check here
implementation "androidx.fragment:fragment:1.2.5"

In my case, I had a Model which was used as arguments but I had not implemented Serializable and Parcelable implementaion.

This problem was created for me as well. The reason was two mistakes.
1.I did not add startDestination in nav graph .
2.I did not add #AndroidEntryPoint annotation in MainActivitey .

This error will only occur after you have added ProGuard & R8 to your project. To fix it, add the following two lines in proguard-rule.pro:
-keepnames class androidx.navigation.fragment.NavHostFragment
-keep class * extends androidx.fragment.app.Fragment{}

For me it was a typo within one of the fragments the navGraph, in the class path of the android:name attribute.. Adding a wrong path for the fragment class doesn't provide a compile time error, instead it raises android.view.InflateException...Error inflating class android.fragment.app.FragmentContainerView
So, make sure to have a correct packaging path for your fragments in android:name
<?xml version="1.0" encoding="utf-8"?>
<navigation 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/nav_graph.xml"
app:startDestination="#id/mainFragment">
<fragment
android:id="#+id/mainFragment"
android:name="com.example.android....MainFragment" // <<<< This must be a correct path
android:label="main_fragment"
</fragment>
</navigation>

If it is Due to Proguard Then add few lines
In proguard-rules.pro file
....
# for FragmentContainerView error
-keepnames class androidx.navigation.fragment.NavHostFragment
-keep class * extends androidx.fragment.app.Fragment{}

Your activity must be a child of FragmentActivity to use androidx.fragment.app.FragmentContainerView either you extend the FragmentActivity or the AppCompatActivity which is a child FragmentActivity class. It is recommended to extend the AppCompatActivity.
see: https://www.tutorialguruji.com/android/trying-to-use-navhostfragment-and-im-getting-an-error-error-inflating-class-androidx-fragment-app-fragmentcontainerview/

Probably after Refactor->Remove unused resources you can lost id from your androidx.fragment.app.FragmentContainerView - bring it back

In my case, despite the same error, reason was different.
However this info about adding some rules to proguard-rules.pro pointed me into the right direction. This, and some other clues in error log about problems with argument in navigation XML file.
Eventually I found that it was problem with using my own classes in argument. And I don't mean the class of argument, but the fact that this class also used some of my other classes. And it was enough to add rules for each of these other classes:
-keepnames class <MyClass>
...

If you have done all the solutions and still the problem stands maybe you should check if your fragment constructor is empty.

In my case I looked deeper inside my stacktrace and found this line: Caused by: java.lang.IllegalStateException: FragmentContainerView must have an android:id to add Fragment MyFragment. Giving it an id and specifying tools:layout fixed problem

Binary XML file line #38: Error inflating class

I'm using 2 phones for debuging and 1 phone is showing my activity fine and the other dose the error, how can I repair it + how can I handle it for another users to not have crashes?
the crash:
07-19 19:51:33.614 18679-18679/itay.finci.org.allerwarn E/AndroidRuntime: FATAL EXCEPTION: main
Process: itay.finci.org.allerwarn, PID: 18679
java.lang.RuntimeException: Unable to start activity ComponentInfo{itay.finci.org.allerwarn/itay.finci.org.allerwarn.intro.IntroActivity}: android.view.InflateException: Binary XML file line #38: Error inflating class com.miz.introactivity.NextDoneButton
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2200)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2250)
at android.app.ActivityThread.access$800(ActivityThread.java:139)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1200)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5105)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:608)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #38: Error inflating class com.miz.introactivity.NextDoneButton
edit:
thanks for AndroidStudio decompiler I adding the done.xml that dose all the errors.
<?xml version="1.0" encoding="utf-8"?>
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="36dp"
android:height="36dp"
android:viewportHeight="48"
android:viewportWidth="48">
<group android:name="done_group">
<path
android:name="done"
android:fillColor="#android:color/white"
android:pathData="M18 32.34L9.66 24l-2.83 2.83L18 38l24-24-2.83-2.83z" />
</group>
</vector>
edit 2:
the layout xml out of the library:
<?xml version="1.0" encoding="utf-8"?>
<merge xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<FrameLayout
android:layout_width="match_parent"
android:paddingLeft="#dimen/title_padding_left"
android:paddingStart="#dimen/title_padding_left"
android:paddingRight="#dimen/title_padding_right"
android:paddingEnd="#dimen/title_padding_right"
android:layout_height="#dimen/navigation_height"
android:layout_gravity="bottom">
<Button
android:id="#+id/skip_button"
android:layout_gravity="center_vertical|left|start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/skip"
android:textColor="#color/skip_text_color"
style="?attr/borderlessButtonStyle"
/>
<LinearLayout
android:id="#+id/progress_layout"
android:orientation="horizontal"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<com.miz.introactivity.NextDoneButton
android:id="#+id/next_button"
android:layout_width="56dp"
android:layout_height="56dp"
android:layout_gravity="center_vertical|right|end"
android:background="#drawable/next_done_button_selector"
/>
</FrameLayout>
</merge>

its an error in your IntroActivity. InflateException: Binary XML file line #38: Error inflating class com.miz.introactivity.NextDoneButton
More than likely; this could be due to any LARGE images you are using and the device is simply out of memory to display it. Try resizing the image to make the size of it smaller

Android App Activity Issue

I'm having trouble opening an activity. In my first activity (activity_main), I have 3 buttons.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:stretchColumns="1">
<TableLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00FFFF"
android:id="#+id/root"
>
<TableRow android:layout_margin="0dip"
android:id="#+id/row1">
<Button android:id="#+id/button01"
android:background="#FFFFFF"
android:layout_width="fill_parent"
android:layout_weight="1"
android:hint="#string/buttonText1"
android:layout_marginTop="60dip"
android:layout_marginBottom="15dip"
android:padding="15dip" />
</TableRow>
<TableRow android:layout_margin="0dip"
android:id="#+id/row2">
<Button android:id="#+id/button02"
android:background="#FFFFFF"
android:layout_width="fill_parent"
android:layout_weight="1"
android:hint="#string/buttonText2"
android:padding="15dip" />
</TableRow>
<TableRow android:layout_margin="0dip"
android:id="#+id/row3">
<Button android:id="#+id/button03"
android:background="#FFFFFF"
android:layout_width="fill_parent"
android:layout_weight="1"
android:layout_marginTop="15dip"
android:hint="#string/buttonText3"
android:onClick="browseExercises"
android:padding="15dip" />
</TableRow>
</TableLayout>
</LinearLayout>
I click on the 3rd button, and my second activity opens, which consists of two additional buttons.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:stretchColumns="1">
<TableLayout android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#00FFFF"
android:id="#+id/root"
>
<TableRow android:layout_margin="0dip"
android:id="#+id/row1">
<Button android:id="#+id/button01"
android:background="#FFFFFF"
android:layout_width="fill_parent"
android:layout_weight="1"
android:hint="#string/alphabetical"
android:layout_marginTop="60dip"
android:layout_marginBottom="15dip"
android:onClick="Alphabetical"
android:padding="15dip" />
</TableRow>
<TableRow android:layout_margin="0dip"
android:id="#+id/row2">
<Button android:id="#+id/button99999"
android:background="#FFFFFF"
android:layout_width="fill_parent"
android:layout_weight="1"
android:hint="#string/group"
android:onClick="muscleGroups"
android:padding="15dip" />
</TableRow>
</TableLayout>
</LinearLayout>
I click on either of these buttons, and I get an error telling me that "Unfortunately, Test_Project has stopped."
I already have an activity created for each of these two buttons, and everything for these two buttons are coded the exact same way as when I created my second activity, which opens just fine, and has buttons I can click on without causing any errors. I think I'm missing something fundamental here, it's like if I create too many activities, they aren't able to look back at my MainActivity.java file for the method that is supposed to open the next activity. Here is my MainActivity.java code:
package com.example.test_project;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.content.Intent;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void browseExercises(View view){
Intent intent = new Intent(this, BrowseExercises.class);
startActivity(intent);
}
public void Alphabetical(View view){
Intent intent = new Intent(this, Alphabetical.class);
startActivity(intent);
}
public void muscleGroups(View view){
Intent intent = new Intent(this, MuscleGroups.class);
startActivity(intent);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
Here is my Manifest file:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.test_project"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.test_project.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.test_project.BrowseExercises"
android:label="#string/title_activity_browse_exercises"
>
</activity>
<activity
android:name="com.example.test_project.MuscleGroups"
android:label="#string/title_activity_muscle_groups" >
</activity>
<activity
android:name="com.example.test_project.Alphabetical"
android:label="#string/title_activity_alphabetical" >
</activity>
</application>
</manifest>
And my logcat file:
04-20 13:46:57.632: W/dalvikvm(26747): threadid=1: thread exiting with uncaught exception (group=0x40dc42a0)
04-20 13:46:57.639: E/AndroidRuntime(26747): FATAL EXCEPTION: main
04-20 13:46:57.639: E/AndroidRuntime(26747): java.lang.IllegalStateException: Could not find a method muscleGroups(View) in the activity class com.example.test_project.BrowseExercises for onClick handler on view class android.widget.Button with id 'button99999'
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.view.View$1.onClick(View.java:3587)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.view.View.performClick(View.java:4106)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.view.View$PerformClick.run(View.java:17052)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.os.Handler.handleCallback(Handler.java:615)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.os.Handler.dispatchMessage(Handler.java:92)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.os.Looper.loop(Looper.java:137)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.app.ActivityThread.main(ActivityThread.java:5059)
04-20 13:46:57.639: E/AndroidRuntime(26747): at java.lang.reflect.Method.invokeNative(Native Method)
04-20 13:46:57.639: E/AndroidRuntime(26747): at java.lang.reflect.Method.invoke(Method.java:511)
04-20 13:46:57.639: E/AndroidRuntime(26747): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
04-20 13:46:57.639: E/AndroidRuntime(26747): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
04-20 13:46:57.639: E/AndroidRuntime(26747): at dalvik.system.NativeStart.main(Native Method)
04-20 13:46:57.639: E/AndroidRuntime(26747): Caused by: java.lang.NoSuchMethodException: muscleGroups [class android.view.View]
04-20 13:46:57.639: E/AndroidRuntime(26747): at java.lang.Class.getConstructorOrMethod(Class.java:460)
04-20 13:46:57.639: E/AndroidRuntime(26747): at java.lang.Class.getMethod(Class.java:915)
04-20 13:46:57.639: E/AndroidRuntime(26747): at android.view.View$1.onClick(View.java:3580)
04-20 13:46:57.639: E/AndroidRuntime(26747): ... 11 more
04-20 13:46:59.202: I/Process(26747): Sending signal. PID: 26747 SIG: 9
Probably something pretty simple I'm just not aware of yet, but any help would be appreciated!!!!

By looking at your comment I guess that you have not created JAVA files for other Activities.
For e.g. you must create BrowseExercise.java file in the directory where your main Activity lies. And then you need to define this Activity in the AndroidManifest.xml file.
An easy way to do is by just clicking +(or something like that) on left TOP corner , then Android , New Activity . Then you just have to select which type of activity you want to use .

Have you made Java files for all your activity? Like if you are opening other activity it should fulfill following requirements:
It should be mention in manifest file with proper action
There should be one java file corresponding to that activity
Layout file should be defined or you should create layout via code
Intent should be properly declared.
If still problem exists please add more code of your intent calling and java files.

Strange Null pointer exception on previously working code

Very strange and frustrating error.
As soon as I load my app on the emulator and try to open it, I am receieving a null pointer exception error within the on create method.
As said in the title, this code has worked perfectly for weeks.
Here is the logcat:
02-14 20:03:45.813: E/AndroidRuntime(285): FATAL EXCEPTION: main
02-14 20:03:45.813: E/AndroidRuntime(285): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.flybase2/com.example.flybase2.MainActivity}: java.lang.NullPointerException
02-14 20:03:45.813: E/AndroidRuntime(285): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
02-14 20:03:45.813: E/AndroidRuntime(285): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
02-14 20:03:45.813: E/AndroidRuntime(285): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
02-14 20:03:45.813: E/AndroidRuntime(285): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
02-14 20:03:45.813: E/AndroidRuntime(285): at android.os.Handler.dispatchMessage(Handler.java:99)
02-14 20:03:45.813: E/AndroidRuntime(285): at android.os.Looper.loop(Looper.java:123)
02-14 20:03:45.813: E/AndroidRuntime(285): at android.app.ActivityThread.main(ActivityThread.java:4627)
02-14 20:03:45.813: E/AndroidRuntime(285): at java.lang.reflect.Method.invokeNative(Native Method)
02-14 20:03:45.813: E/AndroidRuntime(285): at java.lang.reflect.Method.invoke(Method.java:521)
02-14 20:03:45.813: E/AndroidRuntime(285): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
02-14 20:03:45.813: E/AndroidRuntime(285): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
02-14 20:03:45.813: E/AndroidRuntime(285): at dalvik.system.NativeStart.main(Native Method)
02-14 20:03:45.813: E/AndroidRuntime(285): Caused by: java.lang.NullPointerException
02-14 20:03:45.813: E/AndroidRuntime(285): at com.example.flybase2.MainActivity.onCreate(MainActivity.java:33)
02-14 20:03:45.813: E/AndroidRuntime(285): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
02-14 20:03:45.813: E/AndroidRuntime(285): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
02-14 20:03:45.813: E/AndroidRuntime(285): ... 11 more
and here is the class:
package com.example.flybase2;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener{
Button bContacts;
Button bAppointment;
Button bShopping;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.appmenus);
bContacts = (Button) findViewById(R.id.btnCons);
bAppointment = (Button) findViewById(R.id.btnAppoint);
bShopping = (Button) findViewById(R.id.btnShop);
bContacts.setOnClickListener(this);
bAppointment.setOnClickListener(this);
bShopping.setOnClickListener(this);
}
#Override
public void onClick(View passedAppChoice) {
switch(passedAppChoice.getId()){
case (R.id.btnCons):
Intent cons = new Intent("com.example.flybase2.contacts");
startActivity(cons);
break;
case (R.id.btnAppoint):
Intent Appoint = new Intent("com.example.flybase2.appointmantMenu");
startActivity(Appoint);
break;
case (R.id.btnShop):
Intent shop = new Intent("com.example.flybase2.ShoppingList");
startActivity(shop);
break;
}
}
}
Appmenus.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="84dp"
android:orientation="horizontal" >
<ImageView
android:id="#+id/imgLink"
android:layout_width="60dp"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:layout_weight="0.91"
android:src="#drawable/menulist" />
<TextView
android:id="#+id/textView1"
android:layout_width="165dp"
android:layout_height="match_parent"
android:layout_weight="0.14"
android:gravity="center"
android:text="Menu"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textSize="40sp" />
</LinearLayout>
<ScrollView
android:layout_width="match_parent"
android:layout_height="fill_parent" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="#+id/btnCons"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:drawableLeft="#drawable/consicon"
android:src="#drawable/consicon"
android:text="Contacts " />
<Button
android:id="#+id/btnToDo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:drawableLeft="#drawable/todo"
android:src="#drawable/todo"
android:text="&apos;To Do&apos; List" />
<Button
android:id="#+id/btnShop"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:drawableLeft="#drawable/shoppingmenu"
android:src="#drawable/shoppingmenu"
android:text="Shopping List" />
<Button
android:id="#+id/btnAppoint"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="20dp"
android:drawableLeft="#drawable/appointmainicon"
android:src="#drawable/appointmainicon"
android:text="Appointment List" />
</LinearLayout>
</ScrollView>
</LinearLayout>
Hopefully someone can see where I have gone wrong!.

A Few Possible Things:
Does R.layout.appmenus contain all the above buttons (check the IDs). Since R.id is an app-wide namespace, it could have been in other layouts too
The way you're starting your intents seems odd. This is not how you start explicit intents.
An Explicit Intent should be of the form:
Intent explicitIntent = new Intent(InvokingActivity.this,InvokedActivity.class);
startActivity(explicitIntent);

add this logs print in onCreate just after initializing buttons objects.
Log.d("MainActivityTAG", "bContacts ="+bContacts+ ", bAppointment="+bAppointment+", bShopping="+bShopping);
it seems one of the button object from below code is null.
bContacts = (Button) findViewById(R.id.btnCons);
bAppointment = (Button) findViewById(R.id.btnAppoint);
bShopping = (Button) findViewById(R.id.btnShop);
above log print will let you know which button instance is null, and you ll get to know if you are getting button with wrong ID or setting wrong layout which doesn’t have one of these buttons defined.

Eventually started a new project and simply copied the code over so it was very quick. It is working now. I have no idea what happened but believe it is down to some sort of corruption in my XML appmenu.xml file layout. For what ever reason I think the appointments button can no longer be 'seen' by eclipse even though it is clearly there and referenced by its ID. Many thanks to all who contributed.

Error inflating class <unknown> on second running of app

I have a multi-activity app that is already on the market and is generally working fine. Just recently I have been modifying the code to process my (mopub) adverts in a different way. This seems to work fine when I run the program and play through multiple levels. The ads are appearing exactly when and where I want them. The problem comes after I quit the program and then try and start it again. My program's first activity is a "splash screen". On the second run I get the following error:
04-23 11:16:50.374: W/dalvikvm(10512): threadid=1: thread exiting with uncaught exception (group=0x40015560)
04-23 11:16:50.394: E/AndroidRuntime(10512): FATAL EXCEPTION: main
04-23 11:16:50.394: E/AndroidRuntime(10512): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mycompany.mygame/com.mycompany.mygame.Splash}: android.view.InflateException: Binary XML file line #24: Error inflating class <unknown>
04-23 11:16:50.394: E/AndroidRuntime(10512): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
04-23 11:16:50.394: E/AndroidRuntime(10512): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
04-23 11:16:50.394: E/AndroidRuntime(10512): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
04-23 11:16:50.394: E/AndroidRuntime(10512): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
04-23 11:16:50.394: E/AndroidRuntime(10512): at android.os.Handler.dispatchMessage(Handler.java:99)
04-23 11:16:50.394: E/AndroidRuntime(10512): at android.os.Looper.loop(Looper.java:123)
04-23 11:16:50.394: E/AndroidRuntime(10512): at android.app.ActivityThread.main(ActivityThread.java:3683)
Any idea what could cause this - and why it didn't complain on the first run?
EDIT:
Here's the xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center|center_horizontal|center_vertical"
android:background="#drawable/background"
android:orientation="vertical" >
<LinearLayout
android:id="#+id/linearLayout1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical" >
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" Blah blah blah"
android:textAppearance="?android:attr/textAppearanceMedium" />
<ImageView <<== THIS IS LINE 24
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/mygame_logo" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=" My company name"
android:textAppearance="?android:attr/textAppearanceMedium" />
</LinearLayout>
</LinearLayout>
EDIT: In response to a comment...
I have an application class defined as:
public class Globals extends Application
{
}
In its onCreate method I have...
allocate_and_initialise_fresh_new_mAdView();
load_mopub_banner_ad();
which are defined as...
void allocate_and_initialise_fresh_new_mAdView()
{
mAdView = new MoPubView(this);
mAdView.setAdUnitId("agltb3B1Yi1pbmNyDAsSBFNpdGUYkaoMDA");// PUB_ID_320x50
}
void load_mopub_banner_ad()
{
if (mAdView != null)
{
mAdView.loadAd();
}
debug("Completed loadAd");
}

You are initializing a View in the Application class!
This is inadvisable and may mess things up. The context of a view should be the Activity that encompasses its lifetime. That is what the os expects from you.
Just remove it from the Application class and these errors will not re-appear.