Как установить JDK в Ubuntu Linux

// Это работает на Android Lollipop 5.0.2

public static boolean launchApp(Context context, String packageName) {

    final PackageManager manager = context.getPackageManager();
    final Intent appLauncherIntent = new Intent(Intent.ACTION_MAIN);
    appLauncherIntent.addCategory(Intent.CATEGORY_LAUNCHER);

    List<ResolveInfo> resolveInfos = manager.queryIntentActivities(appLauncherIntent, 0);
    if ((null != resolveInfos) && (!resolveInfos.isEmpty())) {
        for (ResolveInfo rInfo : resolveInfos) {
            String className = rInfo.activityInfo.name.trim();
            String targetPackageName = rInfo.activityInfo.packageName.trim();
            Log.d("AppsLauncher", "Class Name = " + className + " Target Package Name = " + targetPackageName + " Package Name = " + packageName);
            if (packageName.trim().equals(targetPackageName)) {
                Intent intent = new Intent();
                intent.setClassName(targetPackageName, className);
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(intent);
                Log.d("AppsLauncher", "Launching Package '" + packageName + "' with Activity '" + className + "'");
                return true;
            }
        }
    }
    return false;
}