Question

我在将一个画廊应用到片段方面遇到了一些麻烦。我试图放入的画廊曾经是一个活动，但我希望它现在是一个片段，因为我现在正在开发一个不同的项目，使我的应用程序看起来更清洁。

我收到错误

gridView.setAdapter(new ImageAdapter(this));

和

 Intent i = new Intent(getApplicationContext(), FullImageActivity.class);

老实说，我不知道如何解决这些问题，任何帮助都会很棒......

另外，我对Fragments没有多少经验，我对它很新，所以欢迎任何可以帮助我理解我做错的细节！

这是Java代码：

package info.androidhive.slidingmenu;

import android.app.Activity;
import android.app.Fragment;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;


public class GalleryActivity extends Fragment {
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState); }
    //setContentView(R.layout.gallery_layout);

    public View onCreateView(LayoutInflater inflater, ViewGroup parent, 
            Bundle saedInstanceState) {
        View rootView = inflater.inflate(R.layout.gallery_layout, parent, false);
    GridView gridView = (GridView) rootView.findViewById(R.id.photos);

    // Instance of ImageAdapter Class
    gridView.setAdapter(new ImageAdapter(this));
    gridView.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View v,
                                int position, long id) {

            // Sending image id to FullScreenActivity
            Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
            // passing array index
            i.putExtra("id", position);
            startActivity(i);
        }
    });
}
}

Answer 1

更改此

 gridView.setAdapter(new ImageAdapter(this));

到

 gridView.setAdapter(new ImageAdapter(getActivity()));

this未引用活动上下文，因为您的类扩展了Fragment。 getActvity()返回与此片段关联的活动。

同时更改

  Intent i = new Intent(getApplicationContext(), FullImageActivity.class);

到

  Intent i = new Intent(getActivity(), FullImageActivity.class);

此外，您还需要在onCreateView

的末尾返回rootView

@Override // missing annotation
public View onCreateView(LayoutInflater inflater, ViewGroup parent, 
        Bundle saedInstanceState) {
    View rootView = inflater.inflate(R.layout.gallery_layout, parent, false);
     ...// rest of the code

     return rootView;
}

或覆盖onActivityCreated并使用getView初始化gridview。只需返回onCreateView

中的视图

 @Override // missing annotation
 public View onCreateView(LayoutInflater inflater, ViewGroup parent, 
        Bundle saedInstanceState) {
    View rootView = inflater.inflate(R.layout.gallery_layout, parent, false);

     return rootView;
 }

然后

@Override
public void onActivityCreated(Bundle savedInstanceState) {

 GridView gridView = (GridView) getView().findViewById(R.id.photos);

    // Instance of ImageAdapter Class
    gridView.setAdapter(new ImageAdapter(getActivity()));
    gridView.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View v,
                                int position, long id) {

            // Sending image id to FullScreenActivity
            Intent i = new Intent(getActivity(), FullImageActivity.class);
            // passing array index
            i.putExtra("id", position);
            startActivity(i);
        }
    });
   }

Answer 2

请尝试以下代码

  @Override     
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {      
ViewGroup root = (ViewGroup) inflater.inflate(R.layout.gallery_layout, null);
            GridView gv1=(GridView)root.findViewById(R.id.gridview);
            gv1.setAdapter(new ImageAdapter(getActivity()));
     gridView.setAdapter(new ImageAdapter(this));
        gridView.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View v,
                                    int position, long id) {

                // Sending image id to FullScreenActivity
                Intent i = new Intent(getApplicationContext(), FullImageActivity.class);
                // passing array index
                i.putExtra("id", position);
                startActivity(i);
            }
        });
            return root;
        }

Answer 3

      @Override// This must be in above in your fragment implementing class
   public View onCreateView(LayoutInflater inflater, ViewGroup parent, 
        Bundle saedInstanceState) {
 View rootView = inflater.inflate(R.layout.gallery_layout, parent, false);
GridView gridView = (GridView) rootView.findViewById(R.id.photos);

// Instance of ImageAdapter Class
gridView.setAdapter(new ImageAdapter(getActivity()));
gridView.setOnItemClickListener(new OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View v,
                            int position, long id) {

        // Sending image id to FullScreenActivity
        Intent i = new Intent(getActivity(), FullImageActivity.class);
        // passing array index
        i.putExtra("id", position);
        startActivity(i);
       }
      } 
    );
    }
  return rootView;
 }

从您的代码中删除它：

    @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState); }
   //setContentView(R.layout.gallery_layout);

这也不是一个很好的方法，你应该在创建活动后放置你的片段代码。

在此方法中：

@Override
public void onActivityCreated(Bundle savedInstanceState) {

片段中的画廊

3 个答案: