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    <p>Your app is looking for the <code>sendMessage()</code> method in an activity where the method is not implimented</p> <pre><code>java.lang.IllegalStateException:Could not find a method MainActivity.sendMessage(View) in the activity class com.example.myfirstapp.DisplayMessageActivity for onClick handler on view class android.widget.Button&lt;/p&gt; &lt;p&gt;03-15 18:00:03.430: E/AndroidRuntime(592): </code></pre> <p>is this the xml layout name <code>activity_display_message_1</code> where you declare the Button? you must put the method sendMessage also in the same activity</p> <p>EDIT: FULL SOLUTION</p> <p>activity_main.xml</p> <pre><code> &lt;LinearLayout 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;Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/button_send" android:onClick="sendMessage" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>activity_display_message.xml</p> <pre><code>&lt;LinearLayout 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;EditText android:id="@+id/edit_message" android:layout_weight="1" android:layout_width="0dp" android:layout_height="wrap_content" android:hint="@string/edit_message" /&gt; &lt;/LinearLayout&gt; </code></pre> <p>MainActivity</p> <pre><code>public class MainActivity extends Activity { public final static String EXTRA_MESSAGE = "com.example.myfirstapp.MESSAGE"; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } /** Called when the user clicks the Send button */ public void sendMessage(View view) { // Do something in response to button Intent intent = new Intent(this, DisplayMessageActivity.class); EditText editText = (EditText) findViewById(R.id.edit_message); String message = editText.getText().toString(); intent.putExtra(EXTRA_MESSAGE, message); startActivity(intent); } } </code></pre> <p>DisplayMessageActivity.java</p> <pre><code> public class DisplayMessageActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_display_message_1); // Get the message from the intent Intent intent = getIntent(); String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE); // Create the text view TextView textView = new TextView(this); textView.setTextSize(40); textView.setText(message); } </code></pre> <p>}</p> <p>Update also you manifest file because you've inverse the launcher</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.example.myfirstapp" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="8" android:targetSdkVersion="11" /&gt; &lt;application android:allowBackup="true" android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:theme="@style/AppTheme" &gt; &lt;activity android:name=".MainActivity" android:label="@string/title_activity_display_message"&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;activity android:name=".DisplayMessageActivity" /&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre>
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    1. POIllegalStateException when click on button in android hello world program
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    1. PTAnswer
    1. USFestus Tamakloe
    1. USFestus Tamakloe
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    1. COyou are right, but i'm doing according to google site-http://developer.android.com/training/basics/firstapp/starting-activity.html
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      1. USavinesh
    2. CO@neel in the google example there are 2 xml layouts one which contains the button which implements onclick listener and the second which should be call on click
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      1. USFestus Tamakloe
    3. CO@FestusTamakloe It has only one layout , for the second activity directly set the TextView brother
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      1. USPragnani
 

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