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Android how to use dialogfragment effecitively(using multiple dialog)

I want to show many dialogs in one activity.
I can show one dialog now, but when I add more dialog, it confuses me.
Here is my code.
#NonNull
#Override
public Dialog onCreateDialog(#Nullable Bundle savedInstanceState) {
//then create a alertDialog class
String [] age = getActivity().getResources().getStringArray(R.array.age);
String [] job = getActivity().getResources().getStringArray(R.array.job);
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setTitle("당신의 나이는?");
builder.setItems(age, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
((SetUpActivity)getActivity()).textView_age.setText(age[which]);
}
});
builder.setTitle("당신의 직업은?");
builder.setItems(job, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
((SetUpActivity)getActivity()).textView_job.setText(job[which]);
}
});
return builder.create();
}
When the user click the button,(and appear dialog box)
Here is a code
new FragmentDialogBox().show(getSupportFragmentManager(),"fragmentDialog");
Maybe I change the tag - "fragmentDialog" part?

how to set the gravity in toast and can i change the position of my alert dialog?

i want to set the gravity of toast in the center of the layout but when i add the gravity and run my app my app restarts and then crasehes. i have tried the toast both ways by taking the object and with out object
here is code of my. the error is also attached
#Override
public void onBackPressed() {
new AlertDialog.Builder(MainActivity.this)
.setTitle("Exit")
.setIcon(R.drawable.ic_baseline_warning_24)
.setMessage("Sure? Your Want to Exit.")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
finishAffinity();
}
}).setNegativeButton("No", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
}).setNeutralButton("Other", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Toast toast = Toast.makeText(MainActivity.this, "Click yes for exit.", Toast.LENGTH_SHORT)
.setGravity(Gravity.CENTER, 0,0);
toast.show();
}
}).show();
the error is copied from the run tab
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.androiddevelopment, PID: 3210
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Toast.setGravity(int, int, int)' on a null object reference
at com.example.androiddevelopment.MainActivity$3.onClick(MainActivity.java:52)
at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:177)
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)
i have tried this too but issue did not solved
#Override
public void onBackPressed() {
new AlertDialog.Builder(MainActivity.this)
.setTitle("Exit")
.setIcon(R.drawable.ic_baseline_warning_24)
.setMessage("Are you sure you want to exit")
.setPositiveButton("yes", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
finishAffinity();
}
}).setNeutralButton("Help", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
Toast toast = Toast.makeText(MainActivity.this, "This is an \"Android Studio\" learning app", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0,0);
toast.show();
}
}).setNegativeButton("No", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
}).show();
}

Use:
public void onClick(DialogInterface dialog, int which) {
Toast toast = Toast.makeText(MainActivityJava.this, "Click yes for exit.", Toast.LENGTH_SHORT);
toast.setGravity(Gravity.CENTER, 0,0);
toast.show();
}

How to prevent back button until confirmation message?

In Android Studio, I've used a WebView. So if a user clicks the back button, I want to show a confirmation message before app close.
This is my current code which I used, but it is not working every time
public void onBackPressed() {
new AlertDialog.Builder(this)
.setMessage("Are you sure you want to exit?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
finish();
}
})
.setNegativeButton("No", null)
.show();
}

The above code is working fine.
If you want to navigate the WebView back to the previous page use below one.
#Override
public void onBackPressed() {
if (mWebView.canGoBack()) {
mWebView.goBack();
}else{
new AlertDialog.Builder(this)
.setMessage("Are you sure you want to exit?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
super.onBackPressed();
}
})
.setNegativeButton("No", null)
.show();
}
}

Can you try with it. Hope it works

#Override
public void onBackPressed() {
if (webView.canGoBack()) {
// If web view have back history, then go to the web view back history
webView.goBack();
} else {
// Ask the user to exit the app or stay in here
exitApp();
}
}
public void exitApp() {
final AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
builder.setTitle("Please confirm");
builder.setMessage("Do you want to exit the app?");
builder.setCancelable(true);
builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
finish();
}
});
builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
// Create the alert dialog using alert dialog builder
AlertDialog dialog = builder.create();
// Finally, display the dialog when user press back button
dialog.show();
}

You have to call your confirmation message method inside your Activities onBackPressed Method
#Override
public void onBackPressed() {
if (mWebView.canGoBack()) {
mWebView.goBack();
} else {
onBackPressed() // This is Your Confirmation Dialog method
}
}

#Override
public void onBackPressed() {
if (webView.canGoBack()) {
webView.goBack();
}else {
new AlertDialog.Builder(this)
.setTitle("Are you sure?")
.setMessage("Do you want to exit?")
.setPositiveButton("Close", new DialogInterface.OnClickListener(){
#Override
public void onClick(DialogInterface dialog, int which) {
finish();
}
})
.setNegativeButton("No", null)
.show();
}
This worked for me. Hope it works.

creating alertdialog inside a non activity class

i have a class that implements view.onclicklistener. how do i create an alert dialog from this class which is not an activity class.
i kept on getting this error.
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
this is my code
class LoginView implements View.OnClickListener {
public void onClick(final View v) {
new AlertDialog.Builder(v.getContext())
.setTitle("Delete entry")
.setMessage("Are you sure you want to delete this entry?")
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// continue with delete
}
})
.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// do nothing
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();

Do it like this
private Handler mHandler = new Handler(Looper.getMainLooper());
#Override
public void run() {
// ...
mHandler.post(new Runnable() {
public void run() {
// Create your AlertDialog Here...
}
});
// ...
}

try this method in your class:
public static void showAlert(Activity activity) {
new AlertDialog.Builder(activity)
.setTitle("Delete entry")
.setMessage("Are you sure you want to delete this entry?")
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// continue with delete
}
})
.setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// do nothing
}
})
.setIcon(android.R.drawable.ic_dialog_alert)
.show();
}

how to reload main activity after click "OK" on AlertDialog

I have an AlertDialog and I want the Main Activity to reload after I have click "OK". The problem is after I have click OK my activity returned to the home screen.
JAVA Code :
private void buildAlertMessageNoGps() {
final AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage(
"This application needs GPS satellite or Wireless Networks localization enabled"
+ "\n" + "Do you want to enable it?")
.setCancelable(true)
.setPositiveButton("Yes",
new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, #SuppressWarnings("unused") final int id) {
startActivity(new Intent(
Settings.ACTION_LOCATION_SOURCE_SETTINGS));
finish();
startActivity(getIntent());
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, #SuppressWarnings("unused") final int id) {
dialog.cancel();
}
});
final AlertDialog alert = builder.create();
alert.show();
}
Help would be appreciated.

Change this code
new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, #SuppressWarnings("unused") final int id) {
startActivity(new Intent(
Settings.ACTION_LOCATION_SOURCE_SETTINGS));
finish();
startActivity(getIntent());
}
to
new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, #SuppressWarnings("unused") final int id) {
startActivityForResult(new Intent(
Settings.ACTION_LOCATION_SOURCE_SETTINGS), 0);
}

Call onCreate method again. But pass null as a parameter.
onCreate(null);