Opening Intent Crashing the App Android Studio

Android App crashing when opening a new intent

Two things, when you initialize your intent, you're using Intent(String action) as the constructor. Is com.rohan.tictactoe.PlayerOne an action? Is it your class? If it's a class, you really shouldn't be doing it that way.

Try this:

public void winner(){
    Intent i = new Intent(this, PlayerOne.class);
    Intent x = new Intent(this, PlayerTwo.class);

    //blahblah rest of your code
}

Secondly, you need to add the activities to your AndroidManifest.xml in order for it to work. Inside your AndroidManifest.xml, you must add this between your application tags:

<activity android:name=".PlayerOne"/>
<activity android:name=".PlayerTwo"/>

Why does my app keep crashing when launching the camera intent in a new activity?

you are occuring java.lang.SecurityException: Permission Denial ... with revoked permission android.permission.CAMERA - your app don't have camera access permission

use runtime permissions for acquire

App crashes while passing Intent

You can try this approach to call the second activity from the asynctask

When initializing the object of asynctask pass the current class reference as parameter

private class insertOTP extends AsyncTask<Void, Void, String> {

private Activity activity;
private ProgressDialog pDialog;

   public insertOTP(Activity activity) {
      this.activity = activity;
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();

        pDialog = new ProgressDialog(activity);
        pDialog.setMessage("Kindly wait...");
        pDialog.setCancelable(false);
        pDialog.show();

    }

    @Override
    protected String doInBackground(Void... params) {

        try {
            // RPS for inserting few things
        } catch (Exception e) {
            e.printStackTrace();
        }

        return response;
    }

    @Override
    protected void onPostExecute(String response) {
        super.onPostExecute(response);
        pDialog.dismiss();

        if (response.equals("success")) {
            Intent intent = new Intent(activity, SecondActivity.class);
            intent.putExtra("class","1");
            activity.startActivity(intent);
        } else {
            Toast.makeText(activity, "This user already exists...", Toast.LENGTH_SHORT).show();
        }
    }
}

Android app crashes when starting a new Intent

Oh, your error is simple.

I think you have copied the Activities and you have forgotten to change the layout in the setContentView() of all of your Activities. all of them are R.layout.activity_main so the app is starting the activity_main.xml but the view are getting findViewById() from their real resources.

Android App crashes when trying to go to a new Intent

**THE PROBLEM LIES HERE! It crashes when I click on the list item, to go to the content...**
    Intent intent = new Intent(MainActivity.this, Post.class); // use MainActivity.this
    intent.putExtra("id", yourId); // seems typo
    startActivity(intent);

Please also check the AndroidManifest.xml.

Activity "Post" should be declared there.

<activity android:name=".Post" />

my app crashes when I start a new intent

You lambda convention for intent is correct.
You should not use JACK for now as it now deprecated or replaced in android studio 2.4 preview

https://android-developers.googleblog.com/2017/04/java-8-language-features-support-update.html

Or you can also Use retrolambda if you want as jack is not supported with databinding.

For your question: my main question here is, what might be causing this issue?

Check you logs to find why the application is crashing
as you said you have defined it in android manifest so that would not be an issue.

Check view whether is null or not (might not be refrenced properly)

I dont think there is any problem with build process as application crashes at runtime.

Do share you log in question.

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