Can't get my difficulty level to load on my Android game
<p>Basically I have to make a maths game with easy/medium/hard difficulties. I used the switch statement to achieve this which calls a method that deals with what to do in each difficulty.</p>

<p>The problem is that I can't get my head around what this method with the switch statement should return, if anything, and how should I call it in the onCreate method. Also I don't know why, but the TextView in the getPuzzle method is giving me an error when I call the tv.setText method on it.</p>

<pre><code>public class Game extends Activity {
    private static final String TAG = "Brain Training";

    public static final String KEY_DIFFICULTY = "com.coursework.braintrain.difficulty";
    public static final int DIFFICULTY_EASY = 0;
    public static final int DIFFICULTY_MEDIUM = 1;
    public static final int DIFFICULTY_HARD = 2;
    public static final int DIFFICULTY_GURU = 3;


    private int brain;




    @Override
protected void onCreate(Bundle savedInstanceState){
    super.onCreate(savedInstanceState);
    Log.d(TAG, "onCreate");

    int diff = getIntent().getIntExtra(KEY_DIFFICULTY, DIFFICULTY_EASY);
    setBrain(getPuzzle(diff));
    getBrain();


    setContentView(R.layout.gamelayout);


    final EditText edittext = (EditText) findViewById(R.id.USERentry);


    final Button button1 = (Button) findViewById(R.id.keypad_1);
    button1.setOnClickListener(new OnClickListener(){
        public void onClick(View v) {
            // Perform action on clicks
            //String buttonText = (String) button.getText();
            edittext.setText(edittext.getText() + "1");
            //edittext.setText() = edittext.getText() + "1";
        }
    });
    //rest of the bottons...
}


public void Easy12(){
    int a = (int) Math.random();
    int b = (int) Math.random();
    final TextView tv = (TextView) findViewById(R.id.question_label);
    String aString = Integer.toString(a);
    String bString = Integer.toString(b);
    String display = aString + bString;
    tv.setText(display);

}

private int getPuzzle(int diff){

    //TODO: Continue last game
    switch(diff){
    case DIFFICULTY_HARD:

        break;
    case DIFFICULTY_MEDIUM:

        break;
    case DIFFICULTY_EASY:
        Easy12();
        break;
    default: Easy12();
    }
    //might require to return an array or something
    return diff;


}


public int getBrain() {
    return brain;
}


public void setBrain(int brain) {
    this.brain = brain;
}


}
</code></pre>

<p>Any advice would be appreciated.</p>

<p>EDIT: Here's the xml file that goes along with it:</p>

<pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt;
&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="fill_parent" 
              android:layout_height="fill_parent" 
              android:orientation="vertical" &gt;
    &lt;TextView android:id="@+id/question_label"
              android:layout_width="wrap_content"
              android:layout_height="wrap_content"
              android:text="Hello" /&gt;
    &lt;EditText
    android:id="@+id/USERentry"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="@android:drawable/editbox_background"
    android:textColor="@color/user_txt_color"/&gt;"
    &lt;TableLayout
    android:id="@+id/keypad"
    android:orientation="vertical"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:stretchColumns="*"&gt;
    &lt;TableRow&gt;
        &lt;Button android:id="@+id/keypad_1"
            android:text="1"&gt;
        &lt;/Button&gt;
        &lt;Button android:id="@+id/keypad_2"
            android:text="2"
            android:onClick=""&gt;
        &lt;/Button&gt;
        &lt;Button android:id="@+id/keypad_3"
            android:text="3"&gt;
        &lt;/Button&gt;
    &lt;/TableRow&gt;
    &lt;TableRow&gt;
        &lt;Button android:id="@+id/keypad_4"
            android:text="4"&gt;
        &lt;/Button&gt;
        &lt;Button android:id="@+id/keypad_5"
            android:text="5"&gt;
        &lt;/Button&gt;
        &lt;Button android:id="@+id/keypad_6"
            android:text="6"&gt;
        &lt;/Button&gt;
    &lt;/TableRow&gt;
    &lt;TableRow&gt;
       &lt;Button android:id="@+id/keypad_7"
            android:text="7"&gt;
        &lt;/Button&gt; 
        &lt;Button android:id="@+id/keypad_8"
            android:text="8"&gt;
        &lt;/Button&gt;
        &lt;Button android:id="@+id/keypad_9"
            android:text="9"&gt;
        &lt;/Button&gt;
    &lt;/TableRow&gt;
    &lt;TableRow&gt;
        &lt;Button android:id="@+id/keypad_0"
            android:text="0"&gt;
        &lt;/Button&gt;
    &lt;/TableRow&gt;
    &lt;TableRow&gt;
        &lt;Button android:id="@+id/keypad_del"
            android:text="del"&gt;
        &lt;/Button&gt;
        &lt;Button android:id="@+id/keypad_minus"
            android:text="-"&gt;
        &lt;/Button&gt;
        &lt;Button android:id="@+id/keypad_hash"
            android:text="#"&gt;
        &lt;/Button&gt;
    &lt;/TableRow&gt;

&lt;/TableLayout&gt;

&lt;/LinearLayout&gt;
</code></pre>
