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PONew intent, how to link to my class?
 

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    <p>I'm beginner in Android (and java), and I'm just playing around and want to create new View after clicking a button. Here is my code so far:</p> <p><strong>Main class</strong></p> <pre><code>package myTests.homeSpace; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; public class TestsActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); Button button1 = (Button) findViewById(R.id.button1); button1.setOnClickListener( new OnClickListener() { public void onClick(View v) { Intent myIntent = new Intent(TestsActivity.this, screen1.class); startActivity(myIntent); } }); } } </code></pre> <p><strong>Class to run after clicking button</strong></p> <pre><code>package myTests.homeSpace; import android.app.Activity; import android.os.Bundle; public class screen1 extends Activity { @Override public void onCreate(Bundle SavedBundleInstance) { super.onCreate(SavedBundleInstance); setContentView(R.layout.screen1); } } </code></pre> <p>The problem is, after hitting button I got "Unforunately, Tests has stopped" error. ("Tests" is application name). I know (or guess) the problem is in this line <code>Intent myIntent = new Intent(TestsActivity.this, screen1.class);</code> I guess my reference to class <code>screen1</code> is wrong somehow, but I have no idea why. There are no compilation errors nor warnings, layout .xmls shouldn't be wrong.</p> <p>Could any of you please advice me any solution?</p> <p><strong>EDIT</strong></p> <p><strong>MANIFEST</strong></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="myTests.homeSpace" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="15" /&gt; &lt;application android:icon="@drawable/ic_launcher" android:label="@string/app_name" &gt; &lt;activity android:name=".TestsActivity" android:label="@string/app_name" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p><strong>CONSOLE OUTPUT</strong></p> <pre><code>[2012-06-20 19:56:21 - ddms] null java.lang.NullPointerException at com.android.ddmlib.JdwpPacket.writeAndConsume(JdwpPacket.java:213) at com.android.ddmlib.Client.sendAndConsume(Client.java:575) at com.android.ddmlib.HandleHello.sendHELO(HandleHello.java:142) at com.android.ddmlib.HandleHello.sendHelloCommands(HandleHello.java:65) at com.android.ddmlib.Client.getJdwpPacket(Client.java:672) at com.android.ddmlib.MonitorThread.processClientActivity(MonitorThread.java:317) at com.android.ddmlib.MonitorThread.run(MonitorThread.java:263) </code></pre>
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    1. COCan you post your `AndroidManifest.xml` file, as well as the LogCat errors? (You can find the latter in Eclipse.) It's likely you haven't declared the Activity yet.
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    2. COYou might have forgotten to declare the `screen1` activity in the manifest file.
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