如何在FrameLayout中设置TextView的文本？

Question

I have a game that adds a point every time a player passes a ball through a goal. I added a TextView that I want updated every time a goal and initialized it with the text "1" and gave it the id "scoreTextView". I tried to declare a TextView variable in my main activity and using addView but my game crashes everytime.I have also tried passing in Layout params along with the TextView to be displayed after reading another StackOverflow question but that also caused my game to crash. When I dont declare a TextView varible and dont add the scoreTextView to the mainView (that is the name of my FrameLayout varible) in my main activity the game actually runs and displays the 1 but if I can't access the scoreTextView from my activity I have no way to change it. So my question is how do I create a TextView in a FrameLayout that I actually can use and change dynamically as needed in my main activity?

I have already looked at this and tried it but they didn't work: Add a Textview to a FrameLayout in a determined position

Answer 1

<FrameLayout
    android:id="@+id/yourFrameLayout"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_above="@+id/lin2"
    android:layout_below="@+id/lin1"
    android:orientation="vertical" >        

    <TextView
        android:id="@+id/messageTextView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_gravity="center"
        android:gravity="center"
        android:textSize="20sp"
        android:text="Put your message over here" />
</FrameLayout>

and then you can visible or invisible this messageTextView according to your need and this is quite easy way to access . hope it ll help you

Answer 2

Maybe your problem is that you are trying to update TextView from non UI thread? The Log message would really help...

If this is the case, then try adding this:

runOnUiThread(new Runnable() {
    public void run() {
        // Update TextView here
TextView scoreTextView = (TextView)findViewById(R.id.scoreTextView);
scoreTextView.setText("Goals scored: " + goals);
    }
});

Answer 3

TextView textView = (TextView) findViewById(R.id.messageTextView);
textView.setText("this is where you add what you want the text to say");

This should be done in the activity class attached to the layout.