I'd like to get my string-array without extending Activity in my custom class. Is there a way to do this?
String[] foo_array = getResources().getStringArray(R.array.foo_array); will not work without extending Activity, so I need a work-around.
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4 Answers
Pass the context to the constructor of custom class and use the same
new CustomClass(ActivityName.this);
Then
Context mContext;
public CustomClass(Context context)
{
mContext = context;
}
use the context
String[] foo_array = mContext.getResources().getStringArray(R.array.foo_array);
Also keep in mind
Do not keep long-lived references to a context-activity (a reference to an activity should have the same life cycle as the activity itself)
http://android-developers.blogspot.in/2009/01/avoiding-memory-leaks.html
Also check this
android getResources() from non-Activity class
Edit:
Change this
public class CustomClass(Context context)
{
}
To
public class CustomClass
{
Context mContext;
public CustomClass(Context context) // constructor
{
mContext = context;
}
}
4 Comments
Joseph Webber
When I change my custom class to
public class CustomClass(Context context) {} it gives me errors saying Syntax error on token "(", { expected.
Raghunandan
@JosephWebber you need to have a constructor not alter the synxtax of class declaration. check the edit
Raghunandan
@JosephWebber check the edit it should work and also check this docs.oracle.com/javase/tutorial/java/javaOO/constructors.html
Joseph Webber
@ Raghunandan Thanks. I misinterpreted what you said, but I remember how to do it now.
try this,
Context context=getApplicationContext();
String[] foo_array = context.getResources().getStringArray(R.array.foo_array);
And, do not use Activity Context as that is tied to the Activity life cycle.
Update,
getApplicationContext() is from Context class. That means any thing extended Context have this method. This also means you will be able to use this from service or from other resources.
But, if you custom class do not extend Activity/context, you have to pass Context as parameter to use getApplicationContext()
if you declare your activity like this
myMethod(Activity activity) //this is bad
Bud if it is like following,
myMethod(Context context) //this is ok
but from above declaration do not pass Activity or Service Context as they have own life cycle. instead you will use getApplicationContext()
2 Comments
Joseph Webber
Context context=getApplicationContext(); then gives the error The method getApplicationContext() is undefined for the type CustomClass.Raghunandan
why is this
myMethod(Activity activity) bad? developer.android.com/reference/android/content/Context.html. Activity is a known indirect subclass of Context. stackoverflow.com/questions/7298731/…You need pass the Activity context to the Custom class.
private Context context;
public CustomClass(Context context)
{
this.context=context;
}
Comments
if you use numberpicker and pass String from sring xml then use this
np_Basic_Hight.setMinValue(0);
np_Basic_Hight.setMaxValue(71);
np_Basic_Hight.setDisplayedValues(getContext().getResources().getStringArray(R.array.hieght));
