Greetings,
My name is Al. I've been working through Criminal Intent for quite awhile now but keep running into a runtime error. At first, I thought maybe the app had too much memory for my phone because Android Studio didn't show any errors. So, I deleted my first attempt at criminal intent and started over to see if I could catch my error. Upon learning more information about stack trace I was able to track the problem down.
I'm confused because the directions say to rename activity_crime.xml to activity_fragment.xml. It also says to change the reference manually if Android Studio didn't do so. I've tried it a few different ways to get setContentView() on singleFragmentActivity to accept the data but still can't quite figure it out. I will post my stack trace, my activity_crime, my activity_fragment, and singleFragment Activity codes below.
This is my stack trace:
at com.bignerdranch.android.criminalintent.SingleFragmentActivity.onCreate(SingleFragmentActivity.java:20)
This is the line stack trace leads to:
setContentView(R.layout.activity_fragment);
This is the SingleFragmentActivity.Java class:
package com.bignerdranch.android.criminalintent;
When I ran the debugger it said the savedInstanceState was null, this is the debuggers output:
@Override
protected void onCreate(Bundle savedInstanceState) //SavedInstanceState: null
{
super.onCreate(savedInstanceState); //SavedInstanceState: null
setContentView(R.layout.activity_fragment);//This is the stack trace Java line 20
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v7.app.AppCompatActivity;
/**
-
Created by JB on 12/14/2017.
*/
//8.8 Adding a generic superclass
public abstract class SingleFragmentActivity extends AppCompatActivity
{
protected abstract Fragment createFragment();@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fragment);//This is the stack trace line???//7.15 Getting the FragmentManager FragmentManager fm = getSupportFragmentManager(); //7.16 Adding a CrimeFragment Fragment fragment = fm.findFragmentById(R.id.fragment_container); //container view ID if (fragment == null) { fragment = createFragment(); fm.beginTransaction().add(R.id.fragment_container, fragment).commit(); //fragment_container was created in activity_fragmentent.xml }//end of if statement}//end of onCreate(Bundle)
}//end abstract SingleFragmentActivity class
This is the activity_fragment.xml file:
<?xml version="1.0" encoding="utf-8"?>This is the activity_crime.xml file:
<?xml version="1.0" encoding="utf-8"?>I will continue to research. Thank you in advance for any advice.