Return back to MainActivity from another activity

Question

The MainActivity contains some buttons. Each button opens a new activity via an intent. These activities then have a button to return to the MainActivity via an intent.

But when I press a button to return to the MainActivity, I get some sort of menu on the screen! Someone who knows what could be wrong? Preciate some help! Thanks!

EDIT: The return button in one of the other activities:

Button btnReturn1 = (Button) findViewById(R.id.btnReturn1);
btnReturn1.setOnClickListener(new View.OnClickListener() {      
    public void onClick(View v) {
        // TODO Auto-generated method stub
        Intent returnBtn = new Intent("android.intent.action.MAIN");
        startActivity(returnBtn);
    }
});

The Manifest:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.kullaberg.test02"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="10"
    android:targetSdkVersion="15" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/title_activity_main" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name=".Activity1"
        android:label="@string/title_activity_main" >
        <intent-filter>
            <action android:name="android.intent.action.ACTIVITY001" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>
    <activity
        android:name=".Activity2"
        android:label="@string/title_activity_main" >
        <intent-filter>
            <action android:name="android.intent.action.ACTIVITY002" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>
    <activity
        android:name=".Activity3"
        android:label="@string/title_activity_main" >
        <intent-filter>
            <action android:name="android.intent.action.ACTIVITY003" />

            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>
</application>

Answer 1

why don't you call finish();

when you want to return to MainActivity

   btnReturn1.setOnClickListener(new View.OnClickListener() {
    public void onClick(View v) {
        finish();
    }
});