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PONew to Android, following tutorial but getting errors right at the beginning
 

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  1. PONew to Android, following tutorial but getting errors right at the beginning
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    <p>I decided to convert my iOS apps to Android, and started reading/using the book 'Android Apps for Absolute Beginners'. In Chapter 7, there is a simple tutorial which produces a button changing its state depending on whether pressed or not. I am stuck right at the start! All I have done is create the project, add the file <code>button1.xml</code> into the <code>drawable-xhdpi</code> folder and add in 3 graphic png files @ 96x96 called <code>button1_pressed.png</code> etc.</p> <p>I then added these lines of code to <code>button1.xml</code>:</p> <pre><code>&lt;selector xmlns:android="http://schemas.android.com/apk/res/android "&gt; &lt;item android:state_pressed="true" android:drawable="@drawable/button1_pressed" /&gt; &lt;item android:state_focussed="true" android:drawable="@drawable/button1_focussed" /&gt; &lt;item android:drawable="@drawable/button1_normal" /&gt; </code></pre> <p></p> <p>Here is the MainActivity.java:</p> <pre><code>package third.example.userinterfacedesign; import android.os.Bundle; import android.app.Activity; import android.view.Menu; public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } </code></pre> <p>}</p> <p>and here is the <code>activity_main.xml</code>:</p> <pre><code>&lt;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" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" &gt; &lt;TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/hello_world" /&gt; </code></pre> <p></p> <p>Here is an image showing the errors: <img src="https://i.stack.imgur.com/8KX1J.jpg" alt="enter image description here"></p> <p>What is wrong here?</p>
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    1. PTQuestion
    1. USAndrew T.
    1. USIainGM
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      1. PONew to Android, following tutorial but getting errors right at the beginning
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    1. COIt seems that the `R.java` file is not created. Try to clean and rebuild the project. (Project-Clean...)
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      1. PONew to Android, following tutorial but getting errors right at the beginning
      1. USAndrew T.
    2. CODid you change something in the manifest file ? The problem "R cannot be resolved" can happen when you change the package name in the AndroidManifest.xml file
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      1. PONew to Android, following tutorial but getting errors right at the beginning
      1. USDavid N
    3. COIs that the entire layout XML? It's missing the closing tag for the RelativeLayout. Same for the closing Selector tag in the selector style.
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      1. PONew to Android, following tutorial but getting errors right at the beginning
      1. USSimon
 

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