findViewById在运行方法中返回null（android）

Question

for some reason the run method here has no trouble setting the content view, but when i try to retrieve the button from the xml it returns null and does not allow me to set the onclick listener. my code is listed here below.

v.post(new Runnable() {
    @Override
    public void run() {
        setContentView(R.layout.win);
        Button submit = (Button) findViewById(R.id.submit);
        submit.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                HighScoresHelper scores = new HighScoresHelper("HighScoreV2.txt", GameActivity.this);
                scores.addScore("Test", Math.round((frame/FPS) *100)/100.0);
                startActivity(new Intent(GameActivity.this, HighScores.class));
                finish();
            }
        });
    }
});

and yes, the spelling and everything is all correct and matches up with the xml, here is the xml code

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="YOU WON!!!, enter in your name and click submit"
    android:id="@+id/textView3" />

<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/name" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Submit"
    android:id="@+id/submit"
    android:layout_gravity="center_horizontal" />
 </LinearLayout>

Thank you

Answer 1

So, the problem was that I was calling this inside the inner-class to the activity. What I needed to do was inflate the view and save it as a global variable. I did all of this inside the onCreate method.

  LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            winView = inflater.inflate(R.layout.win, null);
            submit = (Button) winView.findViewById(R.id.submitScore);

            submit.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {

and then inside my inner class I called

v.post(new Runnable() {
                    @Override
                    public void run() {
                        setContentView(winView);
                    }
                });

to change the view when necessary, v was the inner-class instance variable of the main class.

Just to clarify, main class - "GameActivity" and the inner-class was labeled "OurView". v was a global varible of type OurView inside the class GameActivity. I would post the entire class, but its 300+ lines long.