我如何用另一个 Fragment 更改另一个 activity 的 Image ImageButton

Question

我有一个 Fragment (CreaStanzaFragment) 和一个 ImageButton。这个ImageButton有图。现在，当我点击这个图片按钮时，他会打开一个新的 class（画廊，一个有很多图片的 activity）。当我单击其中一张图片时，我需要 ImageButton（在片段中）更改并使用 imagebutton 中的新图片打开此片段。

CreaStanzaFragment 属于导航抽屉。这是片段代码：

public class CreaStanzaFragment extends Fragment {
public CreaStanzaFragment(){}
ImageButton icon;

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

    return rootView;
}

public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    icon = (ImageButton) view.findViewById(R.id.newicon);
    icon.setOnClickListener( new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            startActivity(new Intent(getContext(), Galleria.class));
        }
    });
}

这里我 post 只是 Galleria

的重要部分

public class Galleria extends Activity {
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.gallery_main); //where all the images are located
   recyclerView = (RecyclerView) findViewById(R.id.recycler_view);

   // ......

    recyclerView.addOnItemTouchListener(new GalleryAdapter.RecyclerTouchListener(getApplicationContext(), recyclerView, new GalleryAdapter.ClickListener() {
        @Override
        public void onClick(View view, int position) {
            Bundle bundle = new Bundle();
            bundle.putSerializable("images", images);
            bundle.putInt("position", position);


             Image image = images.get(position);
            String ilnome = inomi.get(position);
            Log.i("ILNOME", ilnome);

      // What i need to do here to change pictures of ImageButton? How can i open Fragment?

            ImageButton icon = (ImageButton) findViewById(R.id.newicon); //loceted in Fragment (CreaStanzaFragment)
            imageButton.setBackgroundResource(0);
            Glide.with(getApplicationContext()).load(image.getMedium())
                    .thumbnail(0.5f)
                    .crossFade()
                    .diskCacheStrategy(DiskCacheStrategy.ALL)
                    .into(imageButton);
            fragmentTransaction.commit();

        }

编写此代码：

    setContentView(R.layout.activity_log_creastanza);
            ImageButton imageButton = (ImageButton) findViewById(R.id.newicon);
            imageButton.setBackgroundResource(0);
            Glide.with(getApplicationContext()).load(image.getMedium())
                    .thumbnail(0.5f)
                    .crossFade()
                    .diskCacheStrategy(DiskCacheStrategy.ALL)
                    .into(imageButton);

当我打开 CreaStanzaFragment 时：

当我点击蓝色图片时（打开 Galleria activity）

当我点击其中一张图片时：

为什么？

Answer 1

基本问题是您需要从 Galleria 实例访问您的片段。为此，您可以暂时 "pass" 当前片段到 Galleria。

Galleria Class 持有对当前 CreaStanzaFragment 的引用：

public class Galleria extends Activity {
  private static CreaStanzaFragment currentCreaStanzaFragment = null;
  public static void setFragment(CreaStanzaFragment f) {currentCreaStanzaFragment = f;}
  public static CreaStanzaFragment getFragment() {return currentCreaStanzaFragment;}
...

在调用 Intent Action 之前在 CreaStamzaFragment 中设置片段引用：

public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    icon = (ImageButton) view.findViewById(R.id.newicon);
    icon.setOnClickListener( new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // pass Fragment Reference
            Galleria.setFragment(CreaStamzaFragment .this)
            startActivity(new Intent(getContext(), Galleria.class));
        }
    });
}

在 Galleria on Adapter Action 中，访问片段并修改 imageButton（意味着片段在后台仍然处于活动状态并且不会重新加载）：

recyclerView.addOnItemTouchListener(new GalleryAdapter.RecyclerTouchListener(getApplicationContext(), recyclerView, new GalleryAdapter.ClickListener() {
    @Override
    public void onClick(View view, int position) {
        Bundle bundle = new Bundle();
        bundle.putSerializable("images", images);
        bundle.putInt("position", position);


        Image image = images.get(position);
        String ilnome = inomi.get(position);
        Log.i("ILNOME", ilnome);

        // get imagebutton on fragment
        CreaStamzaFragment f = Galleria.getFragment()
        ImageButton icon = (ImageButton) f. getView().findViewById(R.id.newicon); //loceted in Fragment (CreaStanzaFragment)
        // load as icon
        icon.setBackgroundResource(0);
        Glide.with(getApplicationContext()).load(image.getMedium())
                .thumbnail(0.5f)
                .crossFade()
                .diskCacheStrategy(DiskCacheStrategy.ALL)
                .into(icon);
        // explicit release reference
        Galleria.setFragment(null);
        // close galliera activity
        Galleria.this.finish();

    }
...

注意： 请注意，这会引入 Fragment 和 Galleria 之间的耦合，一个更简洁但可能更复杂的过程例如使用来自 "Notifier" Galleria 到 "Listener" 已选择图像的片段，片段应在通知处理程序中加载图像。

然而，如果 Galleria/CreaStanzaFragment 不被重用，那么实施起来就足够了。

我如何用另一个 Fragment 更改另一个 activity 的 Image ImageButton

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