How can I solve this memory leak? Actually, where is the memory leak?

Question

I would like to create an easy todo appliacation, that stores data in shared preferences. Therefore I have created a class called PrefManager, which one contains all of my methods in connection managing preferences. In this case the method "getSharedPreferences" needs a context. Thats okay, but I have to use this class all in my other classes, included the recyclerView adapter class.

So i made this "solution" (ToDoActivity):

public static PrefManager mPrefManager;
private RecyclerView mRecyclerView;
private ToDoRecyclerViewAdapter adapter;
private Context context;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_to_do);

    context = getApplicationContext();
    adapter = new ToDoRecyclerViewAdapter(this);
    mPrefManager = new PrefManager(context, adapter);
    mPrefManager.setupThePreferences();
    ...

and imported everywhere:

   import static bla.bla.bla.ToDoActivity.mPrefManager;

But I get this error:

Do not place Android context classes in static fields (static reference to PrefManager which has field context pointing to Context); this is a memory leak (and also breaks Instant Run). A static field will leak contexts.

How can I make it better? How can I solve this?

EDIT

I use it for example in the RecycleView Adapter by deleting an item:

 public class ToDoRecyclerViewAdapter extends RecyclerView.Adapter <ToDoRecyclerViewAdapter.ViewHolder>

There:

holder.mView.setOnLongClickListener(new View.OnLongClickListener() {
     @Override
     public boolean onLongClick(View v) {

         int identifier = holder.myTodo.getIdentifier();
         removeTodo(position);
         mPrefManager.deleteThePref(identifier);

         return false;
    }
});

Or in my Todo creating activity:

public class CreateActivity extends Activity

There:

btnCreateExit.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        mPrefManager.saveNewToDo(editTodoTitle.getText().toString(), spinnerTodoPriority.getSelectedItemPosition(), editTodoDescription.getText().toString(), date);
        finish();
    }
});

Answer 1

• In TodoActivity ,declare PrefManager and generate getter for it.

   private PrefManager mPrefManager; public PrefManager getmPrefManager{ return mPrefManager; } 

• In Adapter ,when you delete an item:

    removeTodo(position); ((TodoActivity)context).getmPreManager().deleteThePref(identifier); 

• Recreate constructor for PrefManager and pass only context :

   public PrefManager(Context context){ super(); context.getSharedPreferences(...); } 

• In CreateActivity , new a PrefManager :

   mPrefManager = new PrefManager(context); mPrefManager.setupThePreferences(); 

Answer 2

Try extending your activities to access your ToDoActivity.

For example:

public class AnotherActivity extends ToDoActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_to_do);

context = getApplicationContext();
adapter = new ToDoRecyclerViewAdapter(this);
mPrefManager = new PrefManager(context, adapter);
mPrefManager.setupThePreferences();
...
    }
}