AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2008 The Android Open Source Project

     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at

          http://www.apache.org/licenses/LICENSE-2.0

     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.android.email"
    android:versionCode="230000"
    android:versionName="2.3"
    >

    <application android:icon="@drawable/icon" android:label="@string/app_name"
        android:name="Email">

        <!-- Main activity. It opens from launcher -->
        <activity
            android:name=".activity.Welcome">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <!-- This activity will be invoked on receiving Intents or from within app -->
        <activity
            android:name=".activity.MessageCompose"
            android:label="@string/app_name"
            android:enabled="false"
            >
            <intent-filter>
                <action android:name="android.intent.action.VIEW" />
                <action android:name="android.intent.action.SENDTO" />
                <data android:scheme="mailto" />
                <category android:name="android.intent.category.DEFAULT" />
                <category android:name="android.intent.category.BROWSABLE" />
            </intent-filter>
            <intent-filter android:label="@string/app_name">
                <action android:name="android.intent.action.SEND" />
                <data android:mimeType="*/*" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
            <intent-filter android:label="@string/app_name">
                <action android:name="android.intent.action.SEND_MULTIPLE" />
                <data android:mimeType="*/*" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>
</manifest>

MessageCompose.java

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

public class MessageCompose extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        // Initialization skipped

        Intent intent = getIntent();
        mAction = intent.getAction();

        // Handle the various intents that launch the message composer
        if (Intent.ACTION_VIEW.equals(mAction)
                || Intent.ACTION_SENDTO.equals(mAction)
                || Intent.ACTION_SEND.equals(mAction)
                || Intent.ACTION_SEND_MULTIPLE.equals(mAction)) {

        } else {
            // Otherwise, handle the internal cases (Message Composer invoked from within app)
        }
    }
}