Question

我有Fragment（CreaStanzaFragment），ImageButton。这个ImageButton有一张图片。现在当我点击这个图像按钮时，他打开了一个新类（Gallery，一个包含大量图像的活动）。当我点击其中一张图片时，我需要更改ImageButton（片段内）更改并使用imagebutton中的新图片打开此片段。

CreaStanzaFragment属于导航工具。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));
        }
    });
}

这里我只发布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();

        }

使用此代码：

    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（打开Galleria活动）

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。为此你可以暂时＆＃34;通过＆＃34;目前片段到广场。

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CreaStamzaFragment中，您可以在调用Intent Action之前设置Fragment Reference：

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上，访问片段并修改imageButton（暗示片段在后台仍处于活动状态且未重新加载）：

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，例如使用来自＆＃34; Notifier＆＃的通知（观察者模式），更简洁但可能更复杂的过程34; Galleria to＆＃34; Listener＆＃34;选择了Image的片段，Fragment应该在通知处理程序中加载图像。

然而，如果不重复使用Galleria / CreaStanzaFragment，那么实施起来很快并且足够。

如何使用另一个片段从另一个活动更改Image ImageButton

1 个答案: