Two launcher activity

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.component"
    android:versionCode="1"
    android:versionName="1.0" >

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

    <application
        android:allowBackup="true"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.component.SetupActivity"
            android:label="setup"
            android:icon="@drawable/ic_launcher"
            android:clearTaskOnLaunch="true"
            android:enabled="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.example.component.MainActivity"
            android:enabled="false"
            android:icon="@drawable/ic_launcher"
            android:label="main" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

MainActivity.java

package com.example.component;

import android.app.Activity;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.Menu;

public class MainActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}
	
	@Override
	public boolean onKeyDown(int keyCode, KeyEvent event) {
		if (keyCode == KeyEvent.KEYCODE_BACK)
			finish();
		return super.onKeyDown(keyCode, event);
	}

}

SetupActivity.java

package com.example.component;

import android.app.Activity;
import android.content.ComponentName;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class SetupActivity extends Activity {

	private final static String TAG = "SetupActivity";
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		Log.v(TAG, "onCreate");
		setContentView(R.layout.setup);
		
		((Button) findViewById(R.id.button1)).setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View arg0) {
				toggleActivity();
			}
		});
	}
	
	@Override
	protected void onDestroy() {
		super.onDestroy();
		Log.v(TAG, "onDestory");
	}
	
	private void toggleActivity() {
		PackageManager pm = getPackageManager();
		pm.setComponentEnabledSetting(
			new ComponentName(this, SetupActivity.class), 
			PackageManager.COMPONENT_ENABLED_STATE_DISABLED,
			PackageManager.DONT_KILL_APP
		);
		pm.setComponentEnabledSetting(
			new ComponentName(this, MainActivity.class),
			PackageManager.COMPONENT_ENABLED_STATE_ENABLED,
			PackageManager.DONT_KILL_APP
		);
		Intent intent = new Intent(this, MainActivity.class);
		startActivity(intent);
		finish();
	}
}