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POWhy NullPointerException when programmatically add my text view?
 

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  1. POWhy NullPointerException when programmatically add my text view?
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    <p>I programmatically created a linear layout in my Activity like the following:</p> <pre><code>LinearLayout myContent = new LinearLayout(this); myContent.setOrientation(LinearLayout.VERTICAL); </code></pre> <p>Then, I defined a text view in xml (under res/layout/) like below:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;TextView xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/name_text" android:layout_width="80dp" android:layout_height="40dp" android:gravity="center" /&gt; </code></pre> <p>After that, I would like to add several <code>TextView</code> defined above to <code>myContent</code> linear layout programmatically like below:</p> <pre><code>//my content is a linear layout LinearLayout myContent = new LinearLayout(this); myContent.setOrientation(LinearLayout.VERTICAL); for(int i=0; i&lt;10; i++){ //get my text view resource TextView nameField = (TextView)findViewById(R.id.name_text); nameField.setText("name: "+Integer.toString(i)); //NullPointerException here } myContent.addView(); </code></pre> <p>I thought the above code should add 10 <code>TextView</code> with name into <code>myContent</code> linear layout. But I end up with a <strong>NullPointerException</strong> at <code>nameField.setText(...);</code> (see above code) Why?</p> <h2>P.S. (Update)</h2> <p><code>myContent</code> Linear Layout is added to another linear layout which is defined in main.xml, and my activity <strong>has</strong> setContentView(R.layout.main)</p>
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    1. COWhere is your setContentView(R.layout.youtrlayoutid), before you attach your layout ?
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      1. USsat
    2. CO@ sat , check my update, I did setContentView(R.id.main), all the above layout code is only part of my main.xml, I use the above code to implement a dynamic layout feature
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    3. COYou should use an Inflater to use those text fields!
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      1. USAdam Arold
 

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