App crashes when I attempt to run it!

Here is the code, showing no errors, but still not working after rebooting the emulator:

package com.example.alexander.funfacts;

import android.app.Activity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.TextView;

import java.util.Random;

public class FunFactsActivity extends Activity {

private FactBook mFactBook;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_fun_facts);

    //Declare our View variables and assign them the Views from the layout file
    final TextView factLabel = (TextView) findViewById(R.id.factTextView);
    final Button showFactButton = (Button) findViewById(R.id.showFactButton);
    final View.OnClickListener listener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            String fact = mFactBook.getFact();

            factLabel.setText(fact);

        }
    };
    showFactButton.setOnClickListener(listener);
}

}

Remove final from View.OnClickListener statement.

You should also remove it from Button showFactButton statement. I think this one is set there automatically by Android Studio, and although it will be needed there, you should first learn about it.

You have Null Pointer Exception error at line 29, which means your code puts somewhere a null, where it shouldn't. Since we don't see line numbers, I just can hope removing final will help : )

Hello, I'm still having this issue, even though I deleted final!

Here's the error messages from logcat:

10-08 13:24:39.334 1145-1145/com.example.alexander.funfacts I/Process﹕ Sending signal. PID: 1145 SIG: 9 10-08 13:25:10.044 1198-1198/com.example.alexander.funfacts D/﹕ HostConnection::get() New Host Connection established 0xb769b2d0, tid 1198 10-08 13:25:10.184 1198-1198/com.example.alexander.funfacts W/EGL_emulation﹕ eglSurfaceAttrib not implemented 10-08 13:25:10.214 1198-1198/com.example.alexander.funfacts D/OpenGLRenderer﹕ Enabling debug mode 0 10-08 13:25:12.964 1198-1198/com.example.alexander.funfacts D/AndroidRuntime﹕ Shutting down VM 10-08 13:25:12.964 1198-1198/com.example.alexander.funfacts W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xb1accba8) 10-08 13:25:12.984 1198-1198/com.example.alexander.funfacts E/AndroidRuntime﹕ FATAL EXCEPTION: main Process: com.example.alexander.funfacts, PID: 1198 java.lang.NullPointerException at com.example.alexander.funfacts.FunFactsActivity$1.onClick(FunFactsActivity.java:31) at android.view.View.performClick(View.java:4438) at android.view.View$PerformClick.run(View.java:18422) at android.os.Handler.handleCallback(Handler.java:733) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:136) at android.app.ActivityThread.main(ActivityThread.java:5017) 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:779) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) at dalvik.system.NativeStart.main(Native Method) 10-08 13:25:15.374 1198-1198/com.example.alexander.funfacts I/Process﹕ Sending signal. PID: 1198 SIG: 9

And here's the current code:

package com.example.alexander.funfacts;

import android.app.Activity; import android.graphics.Color; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.TextView;

import java.util.Random;

public class FunFactsActivity extends Activity {

private FactBook mFactBook;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_fun_facts);
    final RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.relativeLayout);
    //Declare our View variables and assign them the Views from the layout file
    final TextView factLabel = (TextView) findViewById(R.id.factTextView);
    Button showFactButton = (Button) findViewById(R.id.showFactButton);
    View.OnClickListener listener = new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            String fact = mFactBook.getFact();
            factLabel.setText(fact);
            relativeLayout.setBackgroundColor(Color.RED);

        }
    };
    showFactButton.setOnClickListener(listener);
}

}

Why don't you just follow the lesson? You've changed the code so now error is at the line 31. Maybe even is not the same one.

You shouldn't go on further if the code doesn't behave as you expect (even with an errors present). Go back to the point where your code worked. Did you turned on line numbers in Android Studio? Why not?

I am guessing you have one of the objects empty (or maybe reference to it), so when your code tries to perform a method from emptiness, returns this error : ).

I am actually experiencing the same issue. My code has been written to match the instructor's.

I can show my code here:

---------------------------FunFactsActivity.java--------------------------------------------------------------

package com.megliosolutions.funfacts;

import android.content.DialogInterface; import android.graphics.Color; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Button; import android.widget.RelativeLayout; import android.widget.TextView;

import java.util.Random;

public class FunFactsActivity extends ActionBarActivity {

private FactBook mFactBook;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_fun_facts);



    //Declare our View variables and assign them the views from the layout file
    final TextView factLabel = (TextView) findViewById(R.id.factTextView);
    Button showFactButton = (Button) findViewById(R.id.showFactButton);
    final RelativeLayout relativeLayout = (RelativeLayout) findViewById(R.id.relativeLayout);

    View.OnClickListener listener = new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            String fact = mFactBook.getFact();
            // Update the label with our dynamic fact
            factLabel.setText("");
            relativeLayout.setBackgroundColor(Color.RED);
        }
    };
    showFactButton.setOnClickListener(listener);

}

}

--------------------------------------FactBook.java------------------------------------------------

package com.megliosolutions.funfacts;

import java.util.Random;

/**

• Created by Wesley on 1/8/2015. */ public class FactBook {

  // Member variable (properties about the object) public String[] mFacts = { "Ants stretch when they wake up in the morning.", "Ostriches can run faster than horses.", "Olympic gold medals are actually made mostly of silver.", "You are born with 300 bones; by the time you are an adult you will have 206.", "It takes about 8 minutes for light from the Sun to reach Earth.", "Some bamboo plants can grow almost a meter in just one day.", "The state of Florida is bigger than England.", "Some penguins can leap 2-3 meters out of the water.", "On average, it takes 66 days to form a new habit.", "Mammoths still walked the earth when the Great Pyramid was being built.", "Treehouse is not actually in a tree."}; // Method (abilities: these are things the object can do) public String getFact(){

  String fact = "";
  // Randomly select a fact
  Random randomGenerator = new Random(); //Construct a new Random number generator
  // Assigning an int or number value to choose between
  int randomNumber = randomGenerator.nextInt(mFacts.length);
  //fact is being made equal to randomNumber adding an empty
  fact = randomNumber + "";
  
  fact = mFacts[randomNumber];
  
  return fact;
  

  }

}

I am not sure where my issue is. with the Null pointer error.