Question

I have searched ALOT now, i cant find a solid way to run apps like calendar, camera, facebook, twitter, insatgram, and all kinds of apps in android. I know that i need to use intents, but HOW can i do it? I really need help! Please help me and thanks alot!

Answer 1

If you want to launch some other application from your android application then you should know the package name for that particular application For example for launching facebook use

Intent intent = new Intent("android.intent.category.LAUNCHER");
intent.setClassName("com.facebook.katana", "com.facebook.katana.LoginActivity");
startActivity(intent);

Otherwise this can also be used

Intent LaunchIntent = getPackageManager().getLaunchIntentForPackage("com.package.address");
startActivity(LaunchIntent);

If you want to launch the default android applications installed for some particular kind of operation then you can use implicit intents for that. For example to start a browser you can use

Uri webpage = Uri.parse("http://www.android.com");
Intent webIntent = new Intent(Intent.ACTION_VIEW, webpage);
startActivity(intent);

You should take also take a look at intents and intent filters and how to allow other apps to open your application.