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POAndroid App Crashes When I Try to Show HelloWorld After Button Is Clicked
 

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    <p>I have written a simple app that is supposed to show a button and when that button is clicked, it will show the text: 'Hello World' - however all it is doing is crashing at the moment. </p> <p>The XML is: </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" &gt; &lt;TextView android:id="@+id/hello" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:text="" tools:context=".GraphicsActivity" /&gt; &lt;Button xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/button_send" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Write Something..." android:onClick="writeMsg" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>The Android source is here: </p> <pre><code>public class GraphicsActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_graphics); } public void WriteMsg() { Button button = (Button) findViewById(R.id.button_send); button.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { TextView tv = (TextView) findViewById(R.id.hello); tv.setText("Hello World"); setContentView(tv); } }); } } </code></pre> <p>As I say, all it does is crashes. By the way, I am running this in an emulator.</p>
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      1. USSergey Benner
 

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