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POAndroid adding string to ListView
 

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    <p>As part of a SMS app I am making, I need to add text from a TextView to a Row in a ListView dynamically as the TextView changes... adding another Row each time the TextView says something different.</p> <p>That being said, I created a small example project to try and get the hang of doing this, and I have looked up many examples, but still not working. Upon starting the app, it pauses for a bit and then crashes.</p> <p>I am trying to have the text from my TextView(id:tvContent) from the main.xml layout added to a row of the ListView.</p> <p>Here is my XML Layout:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@color/black" &gt; &lt;Button android:id="@+id/addBtn" android:text="Add New Item" android:layout_width="fill_parent" android:layout_height="wrap_content" android:onClick="addItems" &gt; &lt;/Button&gt; &lt;TextView android:id="@+id/tvContent" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Hey there!" &gt; &lt;/TextView&gt; &lt;ListView android:id="@android:id/list" android:layout_width="fill_parent" android:layout_height="fill_parent" android:drawSelectorOnTop="false" android:background="@color/black" &gt; &lt;/ListView&gt; &lt;/LinearLayout&gt; </code></pre> <p>My Activity Class:</p> <pre><code>package com.example.addtolistview; import java.util.ArrayList; import android.os.Bundle; import android.app.ListActivity; import android.widget.ArrayAdapter; import android.widget.TextView; public class ListViewDemo extends ListActivity { ArrayList&lt;String&gt; listItems=new ArrayList&lt;String&gt;(); ArrayAdapter&lt;String&gt; adapter; TextView theFact = (TextView) findViewById(R.id.tvContent); String shareFact = theFact.getText().toString(); @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); setContentView(R.layout.main); adapter=new ArrayAdapter&lt;String&gt;(this, android.R.layout.simple_list_item_1, listItems); setListAdapter(adapter); listItems.add(shareFact); adapter.notifyDataSetChanged(); } } </code></pre> <p>Here is my log cat... I couldn't figure out how to implement it in the question niceley...</p> <pre><code>D/AndroidRuntime(11420): Shutting down VM W/dalvikvm(11420): threadid=1: thread exiting with uncaught exception (group=0x40c5fa68) FATAL EXCEPTION: main java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.addtolistview/com.example.addtolistview.ListViewDemo}: java.lang.NullPointerException at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1894) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1995) at android.app.ActivityThread.access$600(ActivityThread.java:128) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1161) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:4514) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:980) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:747) at dalvik.system.NativeStart.main(Native Method) Caused by: java.lang.NullPointerException at android.app.Activity.findViewById(Activity.java:1794) at com.example.addtolistview.ListViewDemo.&lt;init&gt;(ListViewDemo.java:15) at java.lang.Class.newInstanceImpl(Native Method) at java.lang.Class.newInstance(Class.java:1319) at android.app.Instrumentation.newActivity(Instrumentation.java:1027) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1885) ... 11 more </code></pre>
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    1. USCaleb
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    1. CO"It pauses for a bit and then it crashes." -- what is the logcat output? what is the exception that caused the problem?
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      1. USAlex Lockwood
 

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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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