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Unfortunately, the app has stopped working

as I am working on the project, my app stops if I add loadpage();

if I erase "loadpage();" everything works.

4 Answers

I notice you've used "Page" instead of "page" in quite a lot of places.


(line 57 )String pageText = Page.getText();

(line 61) mChoice1.setText(Page.getChoice1().getText());
(line 62)mChoice2.setText(Page.getChoice2().getText());

Go throughout your code and review it. See if there are any more such errors. Remember that "Page" is a class (please write that with capital P in the page.java file). When you want to create an instance of that class you use it with a capital P, but the object itself is with lower case. In that case

Page page = new Page();

So fix those issues and see if there are still errors.

I wish things would be solved as I got confused which one is "Page or page" as I started changing for the rest of my code and the error still is there, but I'll go back to the Teachers Videos as I now know where my mistake was, Thank you very much Kristian Terziev :) for being helpful.....

I'll try to explain classes to you in a simple matter so that you can tell the difference between "Page or page". Forget the apges for a moment. First a brief sentence as to what is a class - A class is a blue print that describes the behaviors/states that object of its type support. Now that may sound a little complex so let me give you an exmaple:

/* below is a simple class called "Parent". Every parent has two properties - Name and Age. Therefore we define them. */
public class Parent {
   private String name;
   private int age;

   public Parent (String nameOfParent, int ageOfParent) {
      this -> name = nameOfParent;
      this -> age = ageOfParent;

   public void bossAround() {
     //give some orders

   public void work() {
    //go to work

   public void rest() {
    //take a break or go to sleep

   public String getName() {
     return name;

So what does the class I wrote do. By itself - nothing. It just says what an instance will be able to do. In that case what a parent will be able to do. Every parent can boss around (meaning tell you to do something), work, rest and tell you his name (or at least in my example). Therefore, every parent you "create" from now on, will be able to do those things.

Now, every class needs a constructor. It defines what is required to make an instance of the class. In this case, if you want to create a parent, he must have a name and age. So every time you create a parent you must pass "name" and "age" as parameters. As for the code inside the curly bracelets it assigns the name of the parent the one you gave and his age to the one you gave, also. The "this" stands to indicate that the variable is reffering to the one the parent has, not the one you passed. In this case - his name is equal to "nameOfParent" (the on you pass) and hsi age to "ageOfParent" (you pass that also) //NOTE: You may ahve more than one constructor. If your class was called Bucket (there are different kinds of bucktes) you may need different things for different buckets - material, color, size, shape, etc. You may also not need a thing and not write a constructor. A default one will be used.

So after all this talking, let's create a parent:

Parent mom = new Parent("Susan", 37);

This creates a parent called Susan at the age of 37. Her name is "mom". Now you can use "mom" to do the following things:

  1. Boss around
  2. Work
  3. Rest
  4. Tell you her name

Therefore you can call those methods as such:

mom.bossAround(); // all day
mom.work(); // from 7 a.m. to 1 p.m.
mom.rest(); // when she get's tired
//one more that I'll leave to you

So now, when you need to get the parent's name (as you needed to get the page's text on line 57). What would you do? Will it be




Why? Let's view the first one I offered - You need a name, so you call a method called "getName". However, this method can be used only by instances of the class "Parent". You currently have only one - mom. Therefore, you must use her to get her name. You can't just ask Parent in general what is the name of a single instance. You must ask that instance itself. Meaning you should use the second example I gave

Now let's look at your Page/page problem. You have a class called Page. Remember that it is not a page itlsef - it just describes the states/behaviors that pages support. So when you create a new instance it looks like this:

Page firstPage = new Page(); // my page is called "firstPage" while yours was called just page 

Now, just as the parent example, if you want to get the text of that page, what would you use:




And that basically wraps it up. Try to really understand what goes on here. Forget the duplication of the word page. If you're more comfortable use different words so you can tell the difference between a class and its instance. Read what I wrote here, think about it and give me an example of class. I don't need any constructors or anything. Just a simple class with one or two function inside. Then create an instance of that class and do use one of it's methods. If anything is unclear, be sure to ask.

Kristian Terziev, you're so helpful . I really appreciate that, and for this question you've asked:

"if you want to get the text of that page, what would you use:"

```java firstPage.getText(); OR

Page.getText(); ```java

things are clearer as a day now, it has to be java firstPage.getText();java if it's right, thanks in advance.

That's correct :) Glad to know it cleared up.

Could you include your code so we can take a look at it?

yeah, sure, here its:

package shiidoow.interactivestory.ui;

import android.app.Activity;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import shiidoow.interactivestory.R;
import shiidoow.interactivestory.model.Story;
import shiidoow.interactivestory.model.page;

public class StoryActivity extends Activity {

    public static final String TAG = StoryActivity.class.getSimpleName();

           private Story mStory = new Story();
    private ImageView mImageView;
    private TextView mTextView;
    private Button mChoice1;
    private Button mChoice2;
    private String mName;

    protected void onCreate(Bundle savedInstanceState) {

        Intent intent = getIntent();
        mName = intent.getStringExtra(getString(R.string.key_name));
        if (mName == null)
            mName = "Friend";

        Log.d(TAG,mName );

        mImageView = (ImageView) findViewById(R.id.StoryImageView);
        mTextView = (TextView) findViewById(R.id.storyTextView);
        mChoice1 = (Button) findViewById(R.id.choiceButton1);
        mChoice2 = (Button) findViewById(R.id.choiceButton2);


private void loadpage (){
    page Page  = mStory.getpage(0);
    Drawable drawable = getResources().getDrawable(Page.getmImageID());

    String pageText = Page.getText();

   pageText = String.format(pageText,mName);



Also please edit your coment and add "java" after the first three ` characters. As such

/ ```java

I would appreciate it if you include the error given in the log also. Thanks :)

 page Page  = mStory.getpage(0);

I believe this is your source of error. You should reverse the words. It's Page page because the first word defines the type of the second.

ow, I see. but isn't the first one referring to my java file? I have a file named "page.java" , I tried reversing words but I got many errors.

The first word says that you are creating an instance of a class called Page (in this case). Please copy your errors and paste them here. If they are from a different file. Copy it also.

Care to include the StoryActivity class? If you can use some other website and just include all your files so we don't spam the comments. Provide a link for us after taht and we'll be able to review your code just fine.

I do so, pasting all my files into another website and here is the link.