use startActivityForResult from non-activity

Question

I have MainActivity which is an Activity and other class(which is a simple java class), we`ll call it "SimpleClass". now i want to run from that class the command startActivityForResult.

now i though that i could pass that class(SimpleClass), only MainActivity's context, problem is that, u cant run context.startActivityForResult(...);

so the only way making SimpleClass to use 'startActivityForResult; is to pass the reference of MainActivity as an Activity variable to the SimpleClass something like that:

inside the MainActivity class i create the instance of SimpleClass this way:

SimpleClass simpleClass=new SimpleClass(MainActivity.this); 

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now this is how SimpleClass looks like:

public Class SimpleClass {  Activity myMainActivity;     public SimpleClass(Activity mainActivity) {        super();        this.myMainActivity=mainActivity;        } ....       public void someMethod(...) {         myMainActivity.startActivityForResult(...);     }  } 

now its working, but isnt a proper way of doing this? I`am afraid i could have some memory leaks in the future.

thanks. ray.

Answer 1

I don't know if this is good practice or not, but casting a Context object to an Activity object compiles fine.

Try this:

if (mContext instanceof Activity) {         ((Activity) mContext).startActivityForResult(...); } else {         Log.e("mContext should be an instanceof Activity."); }  

This should compile, and the results should be delivered to the actual activity holding the context.