Android app stops when making random number

Question

I cant seem to find this answer anywhere. I've tried all the code i could find. I have an app that needs to make 2 random numbers, which the user will add together. Its a math practicing app.

Here is the xml code for the ui.

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:id="@+id/num1"
    android:layout_marginRight="50dp"
    android:layout_marginEnd="50dp"
    android:textSize="72sp"
    android:layout_alignParentTop="true"
    android:layout_toLeftOf="@+id/oper"
    android:layout_toStartOf="@+id/oper" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:id="@+id/num2"
    android:textSize="72sp"
    android:layout_alignTop="@+id/oper"
    android:layout_toRightOf="@+id/oper"
    android:layout_toEndOf="@+id/oper"
    android:layout_marginLeft="50dp"
    android:layout_marginStart="50dp" />

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="+"
    android:id="@+id/oper"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:textSize="72sp" />

---

The first textview and the third are random numbers to be generated by the app. The second textview is just an addition sign.

Here is my java code (keep in mind this is not a mainActivity)

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_play_addition);
    updateNums();

}

public void updateNums(){
    final Random random = new Random();
    final int randval = random.nextInt(10 - 1 + 1) + 1;
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            final TextView num1 = (TextView) findViewById(R.id.num1);
            num1.setText(randval);
            final TextView num2 = (TextView) findViewById(R.id.num2);
            num2.setText(randval);
        }});
}

Answer 1

You have to convert the random-value to a String - otherwise it is treated as a string-res

public void updateNums(){
    final Random random = new Random();
    final int randval = random.nextInt(10 - 1 + 1) + 1;
    runOnUiThread(new Runnable() {
        @Override
        public void run() {
            final TextView num1 = (TextView) findViewById(R.id.num1);
            num1.setText(String.valueOf(randval));
            final TextView num2 = (TextView) findViewById(R.id.num2);
            num2.setText(String.valueOf(randval));
        }});
}