TextView returns NPE in for dialog

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I have a method to show dialog and it contains a textview inside it. So I am trying to call that textview to set its text liketvD.setText("SELECT"). But for some reason the app is giving me NPE. Here is my code

This is prompts.xml

<LinearLayout xmlns:android="http://ift.tt/nIICcg"
android:id="@+id/layout_root"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:padding="10dp" >

<TextView
    android:id="@+id/tvD"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:text="PICK"
    android:textAppearance="?android:attr/textAppearanceLarge" />

 </LinearLayout>

And this is the method alertDialog

public void alertDialog() {
    final Context context = this;

    // get prompts.xml view
    LayoutInflater li = LayoutInflater.from(context);
    View promptsView = li.inflate(R.layout.prompts, null);
    final TextView tvDialog = (TextView) findViewById(R.id.tvD);
    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(
            context);
    // set prompts.xml to alertDialog builder
    alertDialogBuilder.setView(promptsView);
    // set its text
    tvDialog.setText("HELLO");
    // set dialog message
    alertDialogBuilder.setCancelable(false).setPositiveButton("OK",
            new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    dialog.cancel();
                }
            });
    // create alert dialog
    AlertDialog alertDialog = alertDialogBuilder.create();

    // show it
    alertDialog.show();

}

Why am I getting this NPE?

asked 20 secs ago

VyprNoch

105