start system apps on android

gistfile1.java

private void startWWWIntent() {
Intent nextIntent = new Intent(Intent.ACTION_VIEW);
nextIntent .setClassName("com.android.browser", "com.android.browser.BrowserActivity");
startActivity(nextIntent);
}


private void startSmsIntent() {
Intent nextIntent = new Intent(Intent.ACTION_VIEW);
nextIntent.setType("vnd.android-dir/mms-sms");
startActivity(nextIntent);
}


private void startContactIntent() {
Intent nextIntent = new Intent(Intent.ACTION_VIEW, People.CONTENT_URI);
startActivity(nextIntent);
}


private void startCallIntent() {
Intent nextIntent = new Intent(Intent.ACTION_DIAL);
startActivity(nextIntent);
}