Btukfyl

Its not a good idea to pass Context objects around. This often will lead to memory leaks. My suggestion is that you don't do it. I have made numerous Android apps without having to pass context to non-activity classes in the app. A better idea would be to get the resources you need access to while your in the Activity or Fragment, and hold onto it in another class. You can then use that class in any other classes in your app to access the resources, without having to pass around Context objects.

There is one more way without creating a object also. Check the reference. Thanks for @cristian. Below I add the steps which mentioned in the above reference. For me I don't like to create a object for that and access. So I tried to access the getResources() without creating a object. I found this post. So I thought to add it as a answer.

Follow the steps to access getResources() in a non activity class without passing a context through the object.

• Create a subclass of Application, for instance public class App extends Application {. Refer the code next to the steps.


• Set the android:name attribute of your <application> tag in the AndroidManifest.xml to point to your new class, e.g. android:name=".App"
  


• In the onCreate() method of your app instance, save your context (e.g. this) to a static field named app and create a static method that returns this field, e.g. getContext().


• Now you can use: App.getContext() whenever you want to get a
  context, and then we can use App.getContext().getResources() to get values from the resources.

This is how it should look:

public class App extends Application{



    private static Context mContext;



    @Override

    public void onCreate() {

        super.onCreate();

        mContext = this;

    }



    public static Context getContext(){

        return mContext;

    }

}

Do you have access to the Context? Or most likely you can get access to it by getApplicationContext()

here is my answer:

public class WigetControl {

private Resources res;



public WigetControl(Resources res) 

{

    this.res = res;

}



public void setButtonDisable(Button mButton)

{

    mButton.setBackgroundColor(res.getColor(R.color.loginbutton_unclickable));

    mButton.setEnabled(false);

}

}

and the call can be like this:

        WigetControl control = new WigetControl(getResources());

        control.setButtonDisable(btNext);

this can be done by using

context.getResources().getXml(R.xml.samplexml);

We can use context Context context = parent.getContext(); Where parent is the ViewGroup.

well no need of passing the context and doing all that...simply do this

Context context = parent.getContext();

Edit: where parent is the ViewGroup

This always works for me:

import android.app.Activity;

import android.content.Context;



public class yourClass {



 Context ctx;



 public yourClass (Handler handler, Context context) {

 super(handler);

    ctx = context;

 }



 //Use context (ctx) in your code like this:

 XmlPullParser xpp = ctx.getResources().getXml(R.xml.samplexml);

 //OR

 final Intent intent = new Intent(ctx, MainActivity.class);

 //OR

 NotificationManager notificationManager = (NotificationManager) ctx.getSystemService(Context.NOTIFICATION_SERVICE);

 //ETC...



}

Not related to this question but example using a Fragment to access system resources/activity like this:

public boolean onQueryTextChange(String newText) {

 Activity activity = getActivity();

 Context context = activity.getApplicationContext();

 returnSomething(newText);

 return false;

}



View customerInfo = getActivity().getLayoutInflater().inflate(R.layout.main_layout_items, itemsLayout, false);

 itemsLayout.addView(customerInfo);

In the tour guide app of Udacity's Basic ANdroid course I have used the concept of Fragments. I got stuck for a while experiencing difficulty to access some string resources described in strings, xml file. Finally got a solution.

This is the main activity class

package com.example.android.tourguidekolkata;

import android.os.Bundle;

import android.support.design.widget.TabLayout;

import android.support.v4.view.ViewPager;

import android.support.v7.app.AppCompatActivity;



public class MainActivity extends AppCompatActivity {



@Override

protected void onCreate(Bundle savedInstanceState)

{

  //lines of code

   //lines of code

    //lines of code

    YourClass adapter = new YourClass(getSupportFragmentManager(), getApplicationContext()); 

    //lines of code

    // getApplicationContext() method passses the Context of main activity to the class TourFragmentPageAdapter 

}

}

This is the non Activity class that extends FragmentPageAdapter

public class YourClass extends FragmentPagerAdapter {

private String yourStringArray = new String[4];

Context context;



public YourClass (FragmentManager fm, Context context)

{

    super(fm);

    this.context = context; // store the context of main activity

    // now you can use this context to access any resource 

    yourStringArray[0] = context.getResources().getString(R.string.tab1);

    yourStringArray[1] = context.getResources().getString(R.string.tab2);

    yourStringArray[2] = context.getResources().getString(R.string.tab3);

    yourStringArray[3] = context.getResources().getString(R.string.tab4);

}

@Override

public Fragment getItem(int position)

 {

 }

@Override

public int getCount() {

return 4;

}



@Override

public CharSequence getPageTitle(int position) {

// Generate title based on item position

return yourStringArras[position];

}

}