android: get items from string array and show it one by one in text view

Question

as i write in title i need some help here for get items from string array and show it one by one in text view i have code that got them all in list view but i need show them on text view one by one each time random here my code and sorry about my bad english ,thanks for help anyway ...

public class MainActivity extends ListActivity {

String[] mTestArray;

    /** Called when the activity is first created. */
    @Override
    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        // Create an ArrayAdapter that will contain all list items
        ArrayAdapter<String> adapter;

        mTestArray =   getResources().getStringArray(R.array.planets_array);    

        /* Assign the name array to that adapter and 
        also choose a simple layout for the list items */ 
        adapter = new ArrayAdapter<String>(
                this,
                android.R.layout.simple_list_item_1,
                mTestArray);

        // Assign the adapter to this ListActivity
        setListAdapter(adapter);
    }
}

XML file:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <TextView

        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:text="@array/planets_array"
/>
</RelativeLayout>

and string array file:

<?xml version="1.0" encoding="utf-8"?>

<resources>
    <string-array name="planets_array">
        <item>Mercury</item>
        <item>Venus</item>
        <item>Earth</item>
        <item>Mars</item>
    </string-array>
</resources>

Solution

Ok, with comments I understood what you need and edited my answer for that. You want to show values of your array in a textView randomly.

Use this activity:

public class MainActivity extends Activity {

    String[] mTestArray;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sample);

        mTestArray =   getResources().getStringArray(R.array.planets_array);    

    }

    @Override
    protected void onResume() {
        super.onResume();
        updateTextView();
    }

    private void updateTextView() {
        TextView textView = (TextView)findViewById(R.id.randomTextView); 
        Random random = new Random();

        int maxIndex = mTestArray.length;
        int generatedIndex = random.nextInt(maxIndex);

        textView.setText(mTestArray[generatedIndex]);   
    }
}

Put this layout under res/layout folder and name it sample.xml.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <TextView
            android:id="@+id/randomTextView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"/>
</RelativeLayout>

Comments

[Ahmed Samir]

thanks for help about it, yes i would like make it show random value each time app start and when app run again its give another random value i hope you understand what

[Devrim]

So you don't want a listView?

[Ahmed Samir]

no i dont need list view all i need Text View show 1 random value from string array each time i run this app .. thanks for reply :)

[Devrim]

Then extend from Activity not ListActivity. Set content of your activity a layout which has a textView(or directly a textView). And use the code at my answer to get random index. Then use that index to get a random array item. Set that array item's text to your textView. Thats all.

[Ahmed Samir]

thanks for your help i l will leave this point its really tired me i will find other way sorry im still new in android develop side :)

[Devrim]

I see. I updated my answer with your comments. Hope that helps. BTW try to ask your question more careful. I was realy hard to understand what you were looking for:)

[Ahmed Samir]

Thank you so much for you kind and your answer , my english little bit bad and im still beginner in android i appreciate your help thankss