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Problem with actionView() - java.lang.NullPointerException:

So this is a part of code found on my MainActivity.java. What it basically does is allowing me to go to the Cart Fragment when I click on the icon (cart_badge_text_view) at the top of my application.
When I try to open the application,the view loads up but then it immediately crashes.
#Override
public boolean onCreateOptionsMenu(final Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
final MenuItem menuItem = menu.findItem(R.id.cartFragment);
View actionView = menuItem.getActionView(); --> PROBLEM
TextView cartBadgeTextView = actionView.findViewById(R.id.cart_badge_text_view);
cartBadgeTextView.setText(String.valueOf(cartQuantity));
cartBadgeTextView.setVisibility(cartQuantity == 0 ? View.GONE : View.VISIBLE);
actionView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onOptionsItemSelected(menuItem);
}
});
This is the logcat after building the app:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.example, PID: 8621
**java.lang.NullPointerException: Attempt to invoke interface method 'android.view.View android.view.MenuItem.getActionView()' on a null object reference --> MAIN PROBLEM**
at com.example.example.views.MainActivity.onCreateOptionsMenu(MainActivity.java:69)
at android.app.Activity.onCreatePanelMenu(Activity.java:4206)
at androidx.fragment.app.FragmentActivity.onCreatePanelMenu(FragmentActivity.java:324)
at androidx.appcompat.view.WindowCallbackWrapper.onCreatePanelMenu(WindowCallbackWrapper.java:94)
at androidx.appcompat.app.AppCompatDelegateImpl$AppCompatWindowCallback.onCreatePanelMenu(AppCompatDelegateImpl.java:3070)
at androidx.appcompat.app.AppCompatDelegateImpl.preparePanel(AppCompatDelegateImpl.java:1895)
at androidx.appcompat.app.AppCompatDelegateImpl.doInvalidatePanelMenu(AppCompatDelegateImpl.java:2176)
at androidx.appcompat.app.AppCompatDelegateImpl$2.run(AppCompatDelegateImpl.java:268)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:223)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)

How to fix error in Dialog after dismiss and click again?

I'm developing webview app, the problem in OnJsAlert that when i click on the Dialog it opens after dismiss it and click again it stop my app, for sorry i can't get the problem from debugging.
This is my MainActivity.class
#Override
public boolean onJsAlert(WebView view, String url, final String alertSource, final JsResult alertResult) {
alertDialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
alertDialog.setContentView(R.layout.activity_alert);
alertDialog.setCancelable(true);
TextView alertMessage = alertDialog.findViewById(R.id.alert_text);
alertMessage.setText(alertSource);
alertDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
alertDialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
#Override
public void onCancel(DialogInterface dialog) {
alertResult.cancel();
}
});
alertDialog.show();
return true;
}
Edited : Log
W/InputEventReceiver: Attempted to finish an input event but the input event receiver has already been disposed.
E/ViewRootImpl: sendUserActionEvent() mView == null
W/System.err: android.util.AndroidRuntimeException: requestFeature() must be called before adding content
W/System.err: at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:331)
at android.app.Dialog.requestWindowFeature(Dialog.java:1057)
at com.xcoder.stepview.MainActivity$4.onJsAlert(MainActivity.java:285)
at com.android.webview.chromium.WebViewContentsClientAdapter.handleJsAlert(WebViewContentsClientAdapter.java:606)
at com.android.org.chromium.android_webview.AwContentsClientBridge.handleJsAlert(AwContentsClientBridge.java:73)
at com.android.org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native Method)
at com.android.org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:27)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:146)
at android.app.ActivityThread.main(ActivityThread.java:5641)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
W/System.err: at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1288)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1104)
at dalvik.system.NativeStart.main(Native Method)
A/libc: Fatal signal 6 (SIGABRT) at 0x00002c6d (code=-6), thread 11373 (xcoder.stepview)
Application terminated.

Your alertDialog is created before public boolean onJsAlert(...) method called and when it's called second time you got AndroidRuntimeException: requestFeature() must be called before adding content because of you can't use requestWindowFeature() with created dialog. You have to create new instance of dialog in this method or reuse global defined dialog.

Android error trying to execute startActivity

I'm trying to add functionality to an action bar. When I hit the button, I want to go to another activity. I did it before and it worked it, but now I'm getting the following error:
12-27 17:22:48.218 1339-1350/? W/Binder:
Caught a RuntimeException from the binder stub implementation.
java.lang.NullPointerException
at android.inputmethodservice.IInputMethodWrapper.setSessionEnabled(IInputMethodWrapper.java:280)
at com.android.internal.view.IInputMethod$Stub.onTransact(IInputMethod.java:129)
at android.os.Binder.execTransact(Binder.java:404)
at dalvik.system.NativeStart.run(Native Method)
12-27 17:22:48.218 1253-1416/? W/InputMethodManagerService:
Got RemoteException sending setActive(false) notification to pid 2082 uid 10056
This is the code:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.ajustes:
return true;
case R.id.modo_edicion:
Intent intent = new Intent(ImagenesAlumnoActivity.this, ModoEdicionActivity.class);
startActivity(intent);
return true;
}
return super.onOptionsItemSelected(item);
}
And this is the code from the activity that I want to show.
public class ModoEdicionActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_modo_edicion);
}
}

Android DexClassLoader error, 'optimized data directory .. not owned by current user'

I am trying to produce a simple android application that can load a DEX file from the SD card at run-time.
The application has two activites. The first activity is a simple screen that has a button. When the button is pressed, the second activity is launched which causes the loadDex() method to be invoked. The loadDex() method attempts to locate a jar file on the SD card and load it into the current application.
Here is my code for the first activity:
package poc.example.del.customclass;
import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void launchLoadClass(View view) {
Intent intent = new Intent(MainActivity.this, LoadClass.class);
startActivity(intent);
}
}
Here is the code for my second activity (the one that loads the DEX file):
package poc.example.del.customclass;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;
import java.io.File;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import dalvik.system.DexClassLoader;
public class LoadClass extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_load_class);
loadDex();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_load_class, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void loadDex() {
String dexFile = "/sdcard/output.jar";
File jarFile = new File(dexFile);
if (jarFile.exists()) {
// Toast.makeText(getApplicationContext(), "It Worked!", Toast.LENGTH_LONG).show();
DexClassLoader cl = new DexClassLoader (jarFile.toString (), "/data/test", null, ClassLoader.getSystemClassLoader());
}
}
}
The issue arise when the DexClassLoader constructor is called. The following error can be found in the log:
03-25 10:15:48.441 1934-1934/poc.example.del.customclass E/AndroidRuntime﹕ FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{poc.example.del.customclass/poc.example.del.customclass.LoadClass}: java.lang.IllegalArgumentException: Optimized data directory /data/test is not owned by the current user. Shared storage cannot protect your application from code injection attacks.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5039)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalArgumentException: Optimized data directory /data/test is not owned by the current user. Shared storage cannot protect your application from code injection attacks.
at dalvik.system.DexFile.<init>(DexFile.java:100)
at dalvik.system.DexFile.loadDex(DexFile.java:149)
at dalvik.system.DexPathList.loadDexFile(DexPathList.java:261)
at dalvik.system.DexPathList.makeDexElements(DexPathList.java:229)
at dalvik.system.DexPathList.<init>(DexPathList.java:96)
at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:56)
at dalvik.system.DexClassLoader.<init>(DexClassLoader.java:57)
at poc.example.del.customclass.LoadClass.loadDex(LoadClass.java:54)
at poc.example.del.customclass.LoadClass.onCreate(LoadClass.java:23)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
            at android.app.ActivityThread.access$600(ActivityThread.java:141)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
            at android.os.Handler.dispatchMessage(Handler.java:99)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:5039)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
            at dalvik.system.NativeStart.main(Native Method)
Here is the line in the log that I believe represents the issue:
java.lang.IllegalArgumentException: Optimized data directory /data/test is not owned by the current user. Shared storage cannot protect your application from code injection attacks.
Any help would be appreciate as I have found very little information on the web regarding the issue. I am developing the application for Android 4.2, Api 17.
Thanks in advance.

I found an answer after a few days of following various tutorials. I thought id post the solution here in case anyone else has a similar problem.
For security reasons, Android does not allow the application to load files to any random folder. Instead it should be loaded to the applications environment. Here is the modified code that has allowed me to continue with the project. The code shown is for the 'loadDex()' method:
public void loadDex() {
// Toast the show the method has been invoked correctly
// Toast.makeText(getApplicationContext(), "loadDex() Method invoked", Toast.LENGTH_LONG).show();
// name of the DEX file
String dexFile = "/output.jar";
// Get the path to the SD card
File f = new File(Environment.getExternalStorageDirectory().toString() + dexFile);
// optimized directory, the applciation and package directory
final File optimizedDexOutputPath = getDir("outdex", 0);
// DexClassLoader to get the file and write it to the optimised directory
DexClassLoader classLoader = new DexClassLoader(f.getAbsolutePath(),
optimizedDexOutputPath.getAbsolutePath(),null, getClassLoader());
// The classpath is created for the new class
String completeClassName = "poc.example.del.mylibrary.name";
String methodToInvoke = "display";
try {
Class<?> myClass = classLoader.loadClass(completeClassName);
Object obj = (Object)myClass.newInstance();
Method m = myClass.getMethod(methodToInvoke);
String s = ""+m.invoke(obj);
makeToast(s);
}
catch (Exception e) {
e.printStackTrace();
makeToast("Something went wrong!");
}
}
The specific line(s) of code that resolved the problem is:
// DexClassLoader to get the file and write it to the optimized directory
DexClassLoader classLoader = new DexClassLoader(f.getAbsolutePath(),
optimizedDexOutputPath.getAbsolutePath(),null, getClassLoader());
As you can see, the optimizedDexOutputPath,getAbsolutePath() method returns the directory that can be used to write files to by the application.
Hope this helps anyone else with a similar issue!

BadTokenException even after referring to Activity and not the application context

android.view.WindowManager$BadTokenException: Unable to add window -- token android.os.BinderProxy#406a6678 is not valid; is your activity running?
at android.view.ViewRoot.setView(ViewRoot.java:528)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
at android.view.Window$LocalWindowManager.addView(Window.java:424)
at android.app.Dialog.show(Dialog.java:241)
at android.app.Activity.showDialog(Activity.java:2569)
at android.app.Activity.showDialog(Activity.java:2527)
at MyCode$8$4.run(MyCode.java:557)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3683)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:878)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636)
at dalvik.system.NativeStart.main(Native Method)
I am getting above exception when following code is executed. This file dialog will shown once the processing is done and progressbar reaches 100%. FileSaveDialog extends Dialog and implements OnCompletionListener
runOnUiThread(new Runnable() {
#Override
public void run() {
showDialog(error.Code());//Line 557
}
});
#Override
protected Dialog onCreateDialog(int id) {
Dialog dialog;
AlertDialog.Builder builder;
final ScrollView scrollView = new ScrollView(this);
final TextView textView = new TextView(this);
switch (id) {
// Other cases are here
case 4:
File playFile = new File(mediaPath, TEMP_WAV_FILE_NAME);
dialog = new FileSaveDialog(this, getResources(),
playFile.getAbsolutePath(), saveDiscardHandler);
dialog.setOnCancelListener(new DialogInterface.OnCancelListener() {
#Override
public void onCancel(DialogInterface dialog) {
// do whatever you want the back key to do
cleanUp();
}
});
break;
// Other cases are here
default:
dialog = null;
}
return dialog;
}

You must check activity isFinishing() If the activity is finishing, returns true; else returns false.