Android ViewPager过滤项目/不显示所有项目

Question

我目前正在开发我的第一个Android应用程序。现在，我真的不知道如何自己处理这个问题。我的主要布局实现了 ViewPager ：

<android.support.v4.view.ViewPager
    android:id="@+id/image_swipe"
    android:layout_width="match_parent"
    android:layout_height="590dp"
    android:layout_marginTop="130dp" /> 

主布局还实现了一个工具栏，该工具栏拥有此菜单项：

<item
      android:id="@+id/show_favorites"
      android:orderInCategory="100"
      android:icon="@drawable/heart_red"
      android:title="@string/show_favorites" />

我基本上想做的事情是：当用户点击id为@show_favorites的菜单项时，应该过滤ViewPager的适配器。 ViewPager中显示的每个项目都有一个ImageButton（favouriteButton）。按钮可以是灰色或红色。按钮状态存储为SharedPreferences，表示：每个项目都有自己的键fav1 - fav10（10个项目），此键值为0（灰色）或值1（红色）。因此，当有人点击菜单项时，我只想在ViewPager中显示标记为收藏的项目（因此在SharedPreferences中存储1）。必须隐藏所有带0的项目。

我的适配器类看起来如下所示：

public class SwipeAdapter extends PagerAdapter  {

/*
    Define the image resources for our image fragment
 */
private int[] image_resources = {
        R.drawable.island_maldives,
        R.drawable.island_kreta,
        R.drawable.island_australia,
        R.drawable.island_kosamui,
        R.drawable.island_domrep,
        R.drawable.island_bahamas,
        R.drawable.island_mallorca,
        R.drawable.island_philippines,
        R.drawable.island_seychelles,
        R.drawable.island_borabora
};

private Context context;
private LayoutInflater layoutInflater;

public SwipeAdapter(Context context) {
    this.context = context;
}

/*
    Count the images in image_resources array
  */
@Override
public int getCount() {
    return image_resources.length;
}

@Override
public boolean isViewFromObject(View view, Object object) {
    return (view == (LinearLayout) object);
}

/*
    Create the page for the given position
    Set image resources and text about current position
 */
@Override
public Object instantiateItem(ViewGroup container, int position) {
    layoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    View item_view = layoutInflater.inflate(R.layout.swipe_layout,container,false);
    ImageView imageView = (ImageView) item_view.findViewById(R.id.swipe_image);
    TextView textView = (TextView) item_view.findViewById(R.id.image_count);
    ImageButton imageButton = (ImageButton) item_view.findViewById(R.id.favourite_button);

    imageView.setImageResource(image_resources[position]);

    // set tag for details
    imageView.setTag(position);

    textView.setText("["+(position+1)+"/10]");

    SharedPreferences prefs = context.getSharedPreferences("favInfo", Context.MODE_PRIVATE);

    // get the unique key consisting of fav and the current item position
    String key = "fav" + (position+1);
    imageButton.setTag(position+1);

    String value = prefs.getString(key, "0");

    // check if value of favorite key is 0
    // set image resource dependent on what value is set
    if (value.equals("1")) {
        imageButton.setImageResource(R.drawable.heart_red);
    } else {
        imageButton.setImageResource(R.drawable.heart);
    }

    container.addView(item_view);

    return item_view;
}

/*
    Remove a page for the given position
 */
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
    container.removeView((LinearLayout) object);
}
}

我的主要活动以这种方式组织：

public class SuggestionActivity extends AppCompatActivity {

ViewPager viewPager;
SwipeAdapter adapter;

private final AppCompatActivity activity = SuggestionActivity.this;

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

    viewPager = (ViewPager) findViewById(R.id.image_swipe);
    adapter = new SwipeAdapter(this);

    viewPager.setAdapter(adapter);

    // set the toolbar for the suggestion page
    Toolbar sToolbar = (Toolbar) findViewById(R.id.suggestion_toolbar);
    setSupportActionBar(sToolbar);
};

/*
    Add options menu at view start
 */
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.suggestion_menu, menu);

    return super.onCreateOptionsMenu(menu);
}

/*
    Declare what happens when user clicks an item of the options menu
    @go_home start the CategoryActivity
    @filter TO DO
 */
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
        case R.id.go_home:
            Intent homeIntent = new Intent(activity, CategoryActivity.class);
            startActivity(homeIntent);
            return true;
        case R.id.show_favorites:
            Intent favIntent = new Intent(activity, SuggestionActivity.class);

            //
            // HERE IS WHERE I DON'T KNOW WHAT TO DO
            //

            startActivity(favIntent);

            return true;
        default:
            // If we got here, the user's action was not recognized.
            // Invoke the superclass to handle it.
            return super.onOptionsItemSelected(item);
    }
}

/*
    Method for click actions on the favorite button
    @heart grey heart symbolizes no favorite (flag 0)
    @heart_red red heart symbolizes marked as favorite (flag 1)
*/
public void onClickFav(View v) {
    ImageButton favouriteButton = (ImageButton) v;

    SharedPreferences prefs = getSharedPreferences("favInfo", MODE_PRIVATE);
    SharedPreferences.Editor editor = prefs.edit();

    // get the unique key by getting the tag of the image button
    String c = v.getTag().toString();
    String key = "fav"+c;

    // get value stored with that key, default: if no value exists take 0
    String value = prefs.getString(key, "0");

    // check if value of favorite key is 0,
    // set image resource dependent on what value is stored behind the key
    if (value.equals("0")) {
        favouriteButton.setImageResource(R.drawable.heart_red);
    } else {
        favouriteButton.setImageResource(R.drawable.heart);
    }

    // do some magic text dependent on what value is set
    if (value.equals("1")) {
        Toast.makeText(SuggestionActivity.this, "No favourite anymore...",
                Toast.LENGTH_SHORT).show();
    } else {
        Toast.makeText(SuggestionActivity.this, "Woah, new favourite!",
                Toast.LENGTH_SHORT).show();
    }

    String isFav;

    // switch value to opposite
    if (value.equals("0")) {
        isFav = "1";
    } else {
        isFav = "0";
    }

    // store shared preferences
    editor.putString(key, isFav);
    editor.commit();
}
}

总之： ViewPager中每个项目的ImageButton状态已经以标记0/1的形式存储为SharedPreferenecs。点击id为@show_favorites的菜单项后，我只想显示1为存储值的项目。

我该怎么做？ 谢谢，征求您的意见！