Preview: phone is there, but stays blank

Android Programming (3rd Edition) 1. Your First Android Application
1

Hi, I went all the way through ch 1, even to the point of seeing the app in the emulator.

But the app is blank.

But I don’t think it’s an emulator problem, because the preview never updated while coding, and always stayed blank, which I knew was weird, but thought maybe would eventually correct itself.

But now I also have a blank GeoQuiz app on my emulator.

Please help! I’ve gone through the code many times, but the messages and gradle console both show nothing is wrong.

2

Can you post the contents of your activity_quiz layout file?

3
<?xml version="1.0" encoding="utf-8"?>

<LinearLayout 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"
    android:gravity="center"
    android:orientation="vertical"
android:baselineAligned="false">

 <TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="240dp"
    android:text="@string/question_text" />

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >
    
<Button
    android:id="@+id/true_button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/true_button"
    tools:ignore="ButtonStyle" />

 <Button
     android:id="@+id/false_button"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:text="@string/false_button"
     tools:ignore="ButtonStyle" />

 </LinearLayout>
4

Two things:

  • Remove the very large padding on your question TextView
  • Your false_button has a height of match_parent, which will make it very large

Does that help?

6

the first one fixed the problem. also fixed the second.

thanks.