Passing variable value into a TextView

Question

Passing variable value into a TextView

I am new at this world, and I just learned how to do some simple code in objective-c but now I am trying to learn basis even for Java and Android. So .. This would be simple even for me with Obj-C but I am having troubles with Java.

I'd want to show the value of the int "numCas" into a TextView so I did like this:

public void  casuale (View v) {

     int numCas = (int) ((Math.random()*10)+1);

System.out.println("Numero: "+ numCas);

    TextView scrittaNumero;
    scrittaNumero = (TextView)findViewById(R.id.textView2);

    scrittaNumero.setText("Hello!");
   // scrittaNumero.setText(numCas);
}

pressing a button I can see the log of a random number in the console and I can see the text "Hello" on screen ... but If I Swap the comments:

   // scrittaNumero.setText("Hello!");
    scrittaNumero.setText(numCas);

I Get errors! I know this is a noob question but I did not find a way in any tutorial! Sorry and thanks in advance!

08-09 05:06:53.017    7472-7472/com.ciavapps.com.onclicktest2 I/System.out﹕ Numero: 7
08-09 05:06:53.017    7472-7472/com.ciavapps.com.onclicktest2 W/ResourceType﹕ No package identifier when getting value for resource number 0x00000007
08-09 05:06:53.057    7472-7472/com.ciavapps.com.onclicktest2 D/AndroidRuntime﹕ Shutting down VM
08-09 05:06:53.057    7472-7472/com.ciavapps.com.onclicktest2 W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xb2ae5ba8)
08-09 05:06:53.077    7472-7472/com.ciavapps.com.onclicktest2 E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.ciavapps.com.onclicktest2, PID: 7472
    java.lang.IllegalStateException: Could not execute method of the activity
            at android.view.View$1.onClick(View.java:3823)
            at android.view.View.performClick(View.java:4438)
            at android.view.View$PerformClick.run(View.java:18422)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: java.lang.reflect.InvocationTargetException
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at android.view.View$1.onClick(View.java:3818)
            at android.view.View.performClick(View.java:4438)
            at android.view.View$PerformClick.run(View.java:18422)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)
     Caused by: android.content.res.Resources$NotFoundException: String resource ID #0x7
            at android.content.res.Resources.getText(Resources.java:244)
            at android.widget.TextView.setText(TextView.java:3888)
            at com.ciavapps.com.onclicktest2.MyActivity.casuale(MyActivity.java:60)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at android.view.View$1.onClick(View.java:3818)
            at android.view.View.performClick(View.java:4438)
            at android.view.View$PerformClick.run(View.java:18422)
            at android.os.Handler.handleCallback(Handler.java:733)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:136)
            at android.app.ActivityThread.main(ActivityThread.java:5017)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
            at dalvik.system.NativeStart.main(Native Method)

android

asked on Stack Overflow Aug 9, 2014 by

Funesto • edited Aug 9, 2014 by

Squonk

3 Answers

Try: scrittaNumero.setText(String.valueOf( numCas ) ); You have to cast the value of numCas to a String, because setText accepts only String.

answered on Stack Overflow Aug 9, 2014 by

Jonas452

Change this

scrittaNumero.setText(numCas);

to

scrittaNumero.setText(Integer.toString(numCas));

You're passing an int value to setText, so it will refer to ids defined in xml. Proper way for you is to convert that int to String and pass it to setText()

answered on Stack Overflow Aug 9, 2014 by

Aniruddha

You need to cast it to String (now compiler won't it interpret as resource):

TextView.setText(numCas + "").
TextView.setText(String.valueOf(numCas));
TextView.setText(Integer.toString(numCas));

answered on Stack Overflow Aug 9, 2014 by

Haresh Chhelana

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