Question

我有一个名为TabFragment的片段，它包含一个ImageAdapter。现在ImageAdapter将创建一个imageView，我将onclick监听器附加到它上面。单击imageView后，我想打开DetailsFragment片段。然而，在imageView上打开按下，显示Toast消息意味着访问特定片段，但片段的实际视图不是。

ImageAdapter类

public class ImageAdapter extends BaseAdapter {
private Context mContext;
private FragmentManager fragmentManager;

public ImageAdapter(Context c,FragmentManager fm) {
    mContext = c;
    fragmentManager = fm;
}

public int getCount() {
    return mThumbIds.length;
}

public Object getItem(int position) {
    return null;
}

public long getItemId(int position) {
    return 0;
}

// create a new ImageView for each item referenced by the Adapter
public View getView(final int position, final View convertView, final ViewGroup parent)
{
    ImageView imageView;
    if(convertView == null)
    {
        imageView = new ImageView(mContext);
        imageView.setLayoutParams(new GridView.LayoutParams(300,300));
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        imageView.setPadding(8,8,8,8);
    }
    else
    {
        imageView = (ImageView) convertView;
    }
    imageView.setImageURI(mThumbIds[position]);
    //check for tap
    if(imageView.getDrawable() != null)
    {
        imageView.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                Toast.makeText(mContext, "clicked", Toast.LENGTH_SHORT).show();

                Fragment detailsFragment = new DetailsFragment();
                FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
                fragmentTransaction.add(R.id.container,detailsFragment);
                fragmentTransaction.addToBackStack(null);
                fragmentTransaction.commit();
            }
        });
    }
    return imageView;
}



private Uri[] mThumbIds = new Uri[20];

public void setUriArr(Uri[] uriArr){
    this.mThumbIds = uriArr;
}

}

DetailsFragment Class

public class DetailsFragment extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_details, container, false);
        Toast.makeText(getContext(), "entered fragment", Toast.LENGTH_SHORT).show();
        return view;
    }
}

TabFragment片段 [以防万一]

public class TabFragment extends Fragment{

    View rootView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        rootView = inflater.inflate(R.layout.fragment_tab, container, false);
        LoadGridView(rootView);

        return rootView;
    }

    @Override
    public void onResume() {
        super.onResume();
        LoadGridView(rootView);
    }

    public void LoadGridView(View v){
        GridView gridview = (GridView) v.findViewById(R.id.grdvwImages);
        ImageAdapter ia = new ImageAdapter(getActivity(),getFragmentManager());

        int i = 0;
        Uri[] imageArray = new Uri[20];
        int pos = getArguments().getInt("position", 0);
        //DeleteAll();
        List<GalleryModel> news = GetNewsArticles(pos);

        if(news.size() != 0){

            for(GalleryModel n:news){
                imageArray[i] = Uri.parse(n.imageDir);
                i++;
            }
            ia.setUriArr(imageArray);
        }
        gridview.setAdapter(ia);

    }


    public List<GalleryModel> GetNewsArticles(int position){
        return new Select()
                .from(GalleryModel.class)
                .where("Section = ?", position)
                .execute();
    }

    public void DeleteAll()
    {
        new Delete().from(GalleryModel.class).execute();
    }


}

fragment_details.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.jerome_pc.myfirstapp.PortalActivity">

    <RelativeLayout
        android:background="@android:color/white"
        android:layout_width="395dp"
        android:layout_height="587dp"
        tools:layout_editor_absoluteX="-5dp"
        tools:layout_editor_absoluteY="-1dp">

        <EditText
            android:id="@+id/editText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignLeft="@+id/button"
            android:layout_alignStart="@+id/button"
            android:layout_below="@+id/editText2"
            android:layout_marginTop="30dp"
            android:ems="10"
            android:hint="Post Description"
            android:inputType="textPersonName" />

        <EditText
            android:id="@+id/editText2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginTop="47dp"
            android:ems="10"
            android:hint="Post Title"
            android:inputType="textPersonName"
            android:layout_alignParentTop="true"
            android:layout_alignLeft="@+id/editText"
            android:layout_alignStart="@+id/editText" />

        <ImageView
            android:id="@+id/imageView3"
            android:layout_width="200dp"
            android:layout_height="200dp"
            app:srcCompat="@android:drawable/ic_menu_gallery"
            android:layout_centerVertical="true"
            android:layout_alignLeft="@+id/editText"
            android:layout_alignStart="@+id/editText" />

        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="75dp"
            android:layout_marginStart="75dp"
            android:layout_marginTop="33dp"
            android:onClick="btnCancelOnClick"
            android:text="Cancel"
            android:layout_below="@+id/imageView3"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true" />

        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:onClick="btnSubmitOnClick"
            android:text="Submit"
            android:layout_alignBaseline="@+id/button"
            android:layout_alignBottom="@+id/button"
            android:layout_toRightOf="@+id/button"
            android:layout_toEndOf="@+id/button"
            android:layout_marginLeft="51dp"
            android:layout_marginStart="51dp" />

    </RelativeLayout>

</android.support.constraint.ConstraintLayout>

Answer 1

替换而不是添加

            Fragment detailsFragment = new DetailsFragment();
            FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.container,detailsFragment);
            fragmentTransaction.addToBackStack(null);
            fragmentTransaction.commit();

编辑：从relativelayout中移除绝对x和y

    <RelativeLayout
    android:background="@android:color/white"
    android:layout_width="395dp"
    android:layout_height="587dp">

并在gradle中检查您的约束布局版本

EDIT2：整理您的代码

为imageadapter中的图像创建单击侦听器，如下所示：

public class ImageAdapter extends BaseAdapter {
private Context mContext;
private FragmentManager fragmentManager;
private ImageAdapterClick imageAdapterListener;

public interface ImageAdapterClick {

    void isClicked();
}

public ImageAdapter(Context c,FragmentManager fm, ImageAdapterClick imageAdapterListener) {
mContext = c;
fragmentManager = fm;
this.imageAdapterListener = imageAdapterListener;
}

然后在getView方法中更改本地侦听器

imageView.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
           imageAdapterListener.isClicked();

       }
    });

然后在TabFragment中以调用该详细信息片段的方式更改适配器

 ImageAdapter ia = new ImageAdapter(getActivity(),getFragmentManager(), new 
 ImageAdapter.ImageAdapterClick (){
        @Override
        public void isClicked() {

        Fragment detailsFragment = new DetailsFragment();
        FragmentTransaction fragmentTransaction = 
        fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.container,detailsFragment);
        fragmentTransaction.addToBackStack(null);
        fragmentTransaction.commit();

       }
    });

片段视图未输出

1 个答案: