Estoy creando una pequeña aplicación en mi tiempo de inactividad y estoy usando muchos fragmentos. Soy bastante nuevo en fragmentos, sin embargo, he usado muchos recursos para usarlos apropiadamente ... o eso pensé. Estoy obteniendo pérdidas de memoria a medida que mi montón sigue creciendo a medida que cambio de fragmento en fragmento. Anteriormente implementé mi aplicación con Actividades y reduje significativamente las fugas de memoria. Sin embargo, ahora que me estoy uniendo al mundo fragmentado, siento que estoy empezando en el punto de partida cuando se trata de la memoria.

MainActivity.java

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);

    // Setting the content view of the Activity
    setContentView(R.layout.main);

    // Setting up the actionbar.
    ActionBar actionbar = getActionBar();
    actionbar.setSubtitle("");
    actionbar.setDisplayOptions(ActionBar.DISPLAY_SHOW_HOME
            | ActionBar.DISPLAY_SHOW_TITLE | ActionBar.DISPLAY_SHOW_CUSTOM);
    actionbar.setTitle("");
    actionbar = null;

    MainMenuFragment frag = new MainMenuFragment();

    getSupportFragmentManager().beginTransaction().add(R.id.fragment_container, frag).commit();
}

Este MainActivity también configura la barra de acción.

MainMenuFragment.java

public class MainMenuFragment extends Fragment implements OnClickListener, LoaderCallbacks<Cursor> {

private static final String TAG = "MainMenuFragment";

SharedPreferences.Editor prefsEditor;
SharedPreferences prefs;

Bitmap[] picss = null;


static int width;

private static int FRIENDS = 0;
private static int PEOPLE = 1;
private static int MAP = 2;
private static int CAMERA = 3;
private static int TOP_TILE = 4;

LinearLayout topTile = null;
LinearLayout mainLayout;

private int NUM_OF_BUTTONS = 4;

ImageButton[] buttonList = null;

Bitmap background;

protected Activity activity;
protected String placeId = null;
protected ViewGroup container;
protected View view;

public void onActivityCreated(Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState); 
    activity = getActivity();

    view = getView();

    setupObjects(view);
    setupLayoutsAndImages(view);

    // Populate the UI by initiating the loader to retrieve the 
    // details of the venue from the underlying Place Content Provider.
    if (placeId != null)
      getLoaderManager().initLoader(0, null, this);
  }



public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.main_screen , container, false);
    this.container = container;

    return view;
}

public void onDestroyView() {
    super.onDestroyView();

    Log.d(TAG, "onDestroyView()");

    buttonList[FRIENDS].setImageBitmap(null);
    buttonList[PEOPLE].setImageBitmap(null);
    buttonList[MAP].setImageBitmap(null);
    buttonList[CAMERA].setImageBitmap(null);
    topTile.setBackground(null);

    // Removes all the onClickListeners
    buttonList[FRIENDS].setOnClickListener(null);
    buttonList[PEOPLE].setOnClickListener(null);
    buttonList[MAP].setOnClickListener(null);
    buttonList[CAMERA].setOnClickListener(null);
    topTile.setOnClickListener(null);

    // Sets buttonList and the topTile to null
     buttonList = null;
     topTile = null;

    // Recycles the bitmaps and sets picss to null
    if (picss != null) {
        picss[FRIENDS].recycle();
        picss[PEOPLE].recycle();
        picss[MAP].recycle();
        picss[CAMERA].recycle();
        picss = null;
    }

    mainLayout.setBackground(null);
    background.recycle();

    unbindDrawables(view);
    view = null;
    activity = null;
    System.gc();
}

private void unbindDrawables(View view) {
    if (view.getBackground() != null) {
        view.getBackground().setCallback(null);
    }
    if (view instanceof ViewGroup && !(view instanceof AdapterView)) {
        for (int i = 0; i < ((ViewGroup) view).getChildCount(); i++) {
            unbindDrawables(((ViewGroup) view).getChildAt(i));
        }
        ((ViewGroup) view).removeAllViews();
    }
}


public void onClick(View v) {
    Log.d(TAG, "Got within here.");
    switch (v.getId()) {
    case R.id.b_friendButton:

        FragmentTransaction trans = getActivity().getSupportFragmentManager().beginTransaction();
        trans.replace(R.id.fragment_container, new FriendsListFrag());
        trans.addToBackStack(null);
        trans.commit();
        break;
    case R.id.b_peopleButton:
        break;
    case R.id.b_mapButton:
        break;
    case R.id.b_CameraButton:
        break;
    case R.id.ll_Dynamic_Tile:
        break;
    }

}

private void setupObjects(View view) {

    Log.d(TAG, "Attempting to setupObjects.");

    mainLayout = (LinearLayout) view.findViewById(R.id.MainActivity_Main_Layout);
    topTile = (LinearLayout) view.findViewById(R.id.ll_Dynamic_Tile);

    buttonList = new ImageButton[NUM_OF_BUTTONS];
    buttonList[FRIENDS] = (ImageButton) view.findViewById(R.id.b_friendButton);
    buttonList[PEOPLE] = (ImageButton) view.findViewById(R.id.b_peopleButton);
    buttonList[MAP] = (ImageButton) view.findViewById(R.id.b_mapButton);
    buttonList[CAMERA] = (ImageButton) view.findViewById(R.id.b_CameraButton);

    picss = new Bitmap[5];

    buttonList[FRIENDS].setOnClickListener(this);
    buttonList[PEOPLE].setOnClickListener(this);
    buttonList[MAP].setOnClickListener(this);
    buttonList[CAMERA].setOnClickListener(this);

    int width = getActivity().getWindowManager().getDefaultDisplay().getWidth();
    int height = getActivity().getWindowManager().getDefaultDisplay().getHeight();

    background = GetImage.decodeSampledBitmapFromResource(getResources(),
            R.drawable.background2, width, height);

    System.out.println(mainLayout == null);

    mainLayout.setBackground(new BitmapDrawable(getResources(), background));

}

private void setupLayoutsAndImages(View view) {

    Log.d(TAG, "Attempting to setupLayoutsAndImages.");

    System.out.println("Width: " + width);
    final ImageButton myButton = (ImageButton) getView().findViewById(R.id.b_friendButton);
    getView().getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        public void onGlobalLayout() {
            System.out.println("Fragwidth: " + getView().getWidth());
            System.out.println("FragHeight: " + getView().getHeight());
            System.out.println("Button: " + myButton.getWidth());
            width = myButton.getWidth();

            System.out.println("Width: " + width);

            getView().getViewTreeObserver().removeGlobalOnLayoutListener(this);

            LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
                    width, width, 1.0f);
            int marg = (int) getResources().getDimension(
                    R.dimen.main_buttonpadding);
            params.setMargins(marg, marg, marg, marg);

            // Setting the params for the buttons.
            buttonList[FRIENDS].setLayoutParams(params);
            buttonList[PEOPLE].setLayoutParams(params);
            buttonList[MAP].setLayoutParams(params);
            buttonList[CAMERA].setLayoutParams(params);

            picss[FRIENDS] = GetImage.decodeSampledBitmapFromResource(
                    getResources(), R.drawable.tilefriendsmall, width, width);
            picss[PEOPLE] = GetImage.decodeSampledBitmapFromResource(
                    getResources(), R.drawable.tilepeoplesmall, width, width);
            picss[MAP] = GetImage.decodeSampledBitmapFromResource(
                    getResources(), R.drawable.tilemapsmall, width, width);
            picss[CAMERA] = GetImage.decodeSampledBitmapFromResource(
                    getResources(), R.drawable.tilecamerasmall, width, width);
            picss[TOP_TILE] = GetImage.decodeSampledBitmapFromResource(
                    getResources(), R.drawable.tilefriendlong, width, width);

            // Setting up the background for the buttons.
            buttonList[FRIENDS].setImageBitmap(picss[FRIENDS]);
            buttonList[FRIENDS].setAlpha(0.6f);
            buttonList[PEOPLE].setImageBitmap(picss[PEOPLE]);
            buttonList[PEOPLE].setAlpha(0.6f);
            buttonList[MAP].setImageBitmap(picss[MAP]);
            buttonList[MAP].setAlpha(0.6f);
            buttonList[CAMERA].setImageBitmap(picss[CAMERA]);
            buttonList[CAMERA].setAlpha(0.6f);

            LinearLayout.LayoutParams topParams = new LinearLayout.LayoutParams(
                    topTile.getWidth(), width);
            topParams.setMargins(marg, marg, marg, marg);
            topTile.setLayoutParams(topParams);
            topTile.setBackground(new BitmapDrawable(getResources(),
                    picss[TOP_TILE]));
            topTile.setAlpha(0.6f);
        }
    });

}

Dado el código anterior, cuando cambio a FriendsListFrag () conservo la memoria anterior que se asignó para MainMenuFragment. He intentado usar el analizador de memoria pero he tenido poca suerte con él.