>Well the problem is that iam trying to make somthing happen that iam
>not really understand (iam trying to learn)
>
>So what i wanna do is to "grabb" the "return true" or the "return
>false" so that i could create my if statement.
In that respect - using the static function call to grab the result for an if
statement - you were using it correctly.
What you must understand, though, is that in order to get through that static
method and return an answer to you, it must execute the code within the method.
That means that you must pass it valid data to work with (or code to *expect*
null references as an acceptable condition), otherwise at run time it will do
exactly what it did to you - throw an exception.
An exception is the Java mechanism for alerting you to the fact that something
bad happened at run time, and it exits out to the nearest catch handler it can
as soon as possible - but not exactly gracefully (it may unwind the stack for
you, but it won't return the value you intended - because code never gets that
far). If you don’t explicitly add a try / catch block higher up the call chain,
then your app will die.
For defending against exceptions you could use a try / catch block around the
code in your isProInstalled() method - but in your case I advise against that
for now, as it's likely going to hide a lot of problems you will encounter
until your understanding improves.
If your method is asking for a context and trying to use it, ask yourself why
you are not passing it any valid context. Can you get a valid context to pass
to it?
If you *want* to be able to get a quick answer without passing a valid context,
then you need to code your method to check the context reference before you use
it - and return an appropriate response if it is null. For example:
protected static boolean isProInstalled(Context context) {
if (context == null)
return false ; // No valid context - can't tell if it's installed.
PackageManager manager = context.getPackageManager();
...
Since your method requires the context to be able to do its job, you need to
try and get a valid context to pass to the method.
If you are calling this code somewhere from an Activity, then the activity
itself is a context you can pass (as ‘this’).
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