Android: Moving Button to different LinearLayout messes up Click Events - android-layout

Question

I've done professional development for over 14 years, but I am learning Android development. I came across a scenario that boggles my mind. I designed a simple layout, then decided to move some of the buttons from one LinearLayout to another LinearLayout within the same layout file.
Now, since moving the buttons, the click events are wired to the wrong buttons! It's as if the resource ids of the buttons were order-dependent.
BEFORE (works correctly):
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/previous_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/previous_button" />
<Button
android:id="#+id/true_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/true_button"/>
<Button
android:id="#+id/false_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/false_button" />
<Button
android:id="#+id/next_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/next_button"/>
</LinearLayout>
AFTER (works incorrectly):
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/true_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/true_button"/>
<Button
android:id="#+id/false_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/false_button" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="#+id/previous_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/previous_button" />
<Button
android:id="#+id/next_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/next_button"/>
</LinearLayout>
As you can see in the "AFTER" code, I want the previous/next buttons to be below the True/False buttons. And, if you look the designer, it's flawless -- perfect! But, the controller hiccups:
True button now becomes the Previous button
False button now becomes the True button
Previous button now becomes the False button
Next button works as it should.
Here is the code that is wiring up the click events (sorry if the code looks lame, I am going through an Android tutorial book, so please don't critique it, it's not mine!):
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quiz);
mQuestionTextView = (TextView)findViewById(R.id.question_text_view);
mQuestionTextView.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
updateQuestion();
}
});
mTrueButton = (Button)findViewById(R.id.true_button);
mTrueButton.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
checkAnswer(true);
}
});
mFalseButton = (Button)findViewById(R.id.false_button);
mFalseButton.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
checkAnswer(false);
}
});
mNextButton = (Button)findViewById(R.id.next_button);
mNextButton.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
mCurrentIndex = (mCurrentIndex + 1) % mQuestionBank.length;
updateQuestion();
}
});
mPreviousButton = (Button)findViewById(R.id.previous_button);
mPreviousButton.setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
int length = mQuestionBank.length;
mCurrentIndex = (mCurrentIndex + (length-1)) % length;
updateQuestion();
}
});
updateQuestion();
}
So these resource ids must be order specific; I can't explain it any other way. The problem is that I don't know how to make my buttons do what they want in the layout that I want.

Answer 1

OK, I think I managed to fix it. In Eclipse/ADT I went to Project -> Clean... and that seemed to do the trick. And yes, it was an issue with the resource ids! I tried posting a nice screen shot of the git repository before/after so you can see what lines from the R.java file changed but I don't have enough reputation points. Sorry.