change default Home Application

from: http://stackoverflow.com/questions/3836215/android-change-default-home-application

Method installPackageMethod = null;
Method deletePackageMethod = null;
Method setPreferredActivityMethod = null;
Method replacePreferredActivityMethod = null;
Object pm = null;


@Override
public void onCreate() {
super.onCreate();
if (pm == null)
pm = getPackageManager();
try {
if (setPreferredActivityMethod == null)
setPreferredActivityMethod = pm.getClass().getMethod(
"addPreferredActivity", IntentFilter.class, int.class,
ComponentName[].class, ComponentName.class);
} catch (NoSuchMethodException e) {
e.printStackTrace();
}
}


private final class ServiceHandler extends Handler {
private Context context;

public ServiceHandler(Looper looper, Context ctx) {
super(looper);
context = ctx;
}

@Override
public void handleMessage(Message msg) {
Intent intent = (Intent) msg.getData().getParcelable(
UPDATER_SERVICE_ACTION);
int request = intent.getIntExtra(
REQUEST_KEY,
REQUEST_UNKNOWN);
Bundle bundle = intent.getExtras();

switch (request) {
case INSTALL_APPLICATION: {
if (bundle != null) {
String appPath = bundle
.getString(APP_PATH_KEY);
if (appPath != null) {
LogUtil.e(TAG, "try to install " + appPath);

try {
am.installPackage(appPath);
} catch (Exception e) {
e.printStackTrace();
}

LogUtil.e(TAG, "install of " + appPath + " done");
}
}
break;
}
case UNISTALL_PACKAGE: {
if (bundle != null) {
String packagename = bundle
.getString(PACKAGE_NAME_KEY);
if (packagename != null) {
LogUtil.e(TAG, "unistall " + packagename);

try {
deletePackageMethod
.invoke(pm, packagename, null, 0);
} catch (Exception e) {
e.printStackTrace();
}
}
}
break;
}
case SET_PREFERRED_LAUNCHER: {
if (bundle != null) {
String package_name = bundle
.getString(PREFERRED_PACKAGE_KEY);
if (package_name == null) {
LogUtil.e(TAG,
"WARNING: setDefaultActivity cannot continue, package is NULL");
return;
}
String activity_name = bundle
.getString(PREFERRED_ACTIVITY_KEY);
if (activity_name == null) {
LogUtil.e(TAG,
"WARNING: setDefaultActivity cannot continue, activity is NULL");
return;
}

LogUtil.e(TAG, "setDefaultActivity activity="
+ activity_name + " package=" + package_name);

IntentFilter filter = new IntentFilter(
"android.intent.action.MAIN");
filter.addCategory("android.intent.category.HOME");
filter.addCategory("android.intent.category.DEFAULT");
ComponentName[] components = new ComponentName[] {
new ComponentName("com.android.launcher",
"com.android.launcher2.Launcher"),
new ComponentName(package_name, activity_name) };
ComponentName activity = new ComponentName(package_name,
activity_name);
try {
setPreferredActivityMethod.invoke(pm, filter,
IntentFilter.MATCH_CATEGORY_EMPTY, components,
activity);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}

}

}