如何使用Intent将networkImageView传递给android中的其他活动

Question

我正在使用图片和一些文字制作自定义列表视图。我已经使用了这个教程http://www.androidhive.info/2014/07/android-custom-listview-with-image-and-text-using-volley/.Now我想从listview中选择一个行项目，并希望显示在其他活动上。我使用onClickListener为此并使用Intent.But传递数据，其他任何活动都没有显示。

这是我的CustomListAdapter类

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;

import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.NetworkImageView;

import java.util.List;

import aquib.lathesis.volleylistview.R;
import aquib.lathesis.volleylistview.SingleItemView;
import aquib.lathesis.volleylistview.app.AppController;
import aquib.lathesis.volleylistview.model.Movie;

public class CustomListAdapter extends BaseAdapter {

    private Activity activity;
    private LayoutInflater inflater;
    private List<Movie> movieItems;

    ImageLoader imageLoader = AppController.getInstance().getImageLoader();

    public CustomListAdapter(Activity activity, List<Movie> movieItems) {
        this.activity = activity;
        this.movieItems = movieItems;
    }

    @Override
    public int getCount() {
        return movieItems.size();
    }

    @Override
    public Object getItem(int location) {
        return movieItems.get(location);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {

        if (inflater == null)
            inflater = (LayoutInflater) activity
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        if (convertView == null)
            convertView = inflater.inflate(R.layout.list_row, null);

        if (imageLoader == null)
            imageLoader = AppController.getInstance().getImageLoader();
        NetworkImageView item_image = (NetworkImageView) convertView
                .findViewById(R.id.item_image);
        TextView item_name = (TextView) convertView.findViewById(R.id.item_name);
        TextView item_category = (TextView) convertView.findViewById(R.id.item_category);
        TextView item_serve = (TextView) convertView.findViewById(R.id.item_serve);
        TextView item_price = (TextView) convertView.findViewById(R.id.item_price);

        // getting movie data for the row
        Movie m = movieItems.get(position);

        // thumbnail image
        item_image.setImageUrl(m.getItem_image(), imageLoader);

        // item name
        item_name.setText(m.getItem_name());

        // item category
        item_category.setText(m.getItem_category());

        // item serve
        item_serve.setText(m.getItem_serve());

       // item price
        item_price.setText(String.valueOf(m.getItem_price()));
        convertView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Movie p = movieItems.get(position);
                Intent i = new Intent(activity.getApplicationContext(), SingleItemView.class);
                i.putExtra("itemimage", p.getItem_image());
                i.putExtra("itemname", p.getItem_name());
                i.putExtra("itemcategory", p.getItem_category());
                i.putExtra("itemserve", p.getItem_serve());
                i.putExtra("itemprice",String.valueOf(p.getItem_price()));
                i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

                activity.getApplicationContext().startActivity(i);
            }
        });
       return convertView;
    }
}

这是我的SingleItemView活动

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

import com.android.volley.toolbox.ImageLoader;
import com.android.volley.toolbox.NetworkImageView;

import aquib.lathesis.volleylistview.app.AppController;
import aquib.lathesis.volleylistview.model.Movie;

public class SingleItemView extends Activity{

    ImageLoader imageLoader = AppController.getInstance().getImageLoader();
    private static String TAG;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //Get the view from singlelistview.xml
        setContentView(R.layout.singlelistview);


        try{
            Intent i = getIntent();
            //Get the result of item image
            i.getStringExtra("itemimage");
            //Get the result of item name
            i.getStringExtra("itemname");
            //Get the result of item category
            i.getStringExtra("itemcategory");
            //Get the result of item serve
            i.getStringExtra("itemserve");
            //Get the result of item price
            i.getStringExtra("itemprice");

            //Locate the image view
            NetworkImageView itemImage = (NetworkImageView) findViewById(R.id.itemImage);
            //Locate the text view
            TextView itemName = (TextView) findViewById(R.id.itemName);
            TextView itemCategory = (TextView) findViewById(R.id.itemCategory);
            TextView itemServe = (TextView) findViewById(R.id.itemServe);
            TextView itemPrice = (TextView) findViewById(R.id.itemPrice);

            Movie m = new Movie();

            itemImage.setImageUrl(m.getItem_image(), imageLoader);
            itemName.setText(m.getItem_name());
            itemCategory.setText(m.getItem_category());
            itemServe.setText(m.getItem_serve());
            itemPrice.setText(String.valueOf(m.getItem_price()));

        } catch (Exception e){
            Log.e(TAG, e.getMessage());
        }
    }
}

这是我的数据文件

包aquib.lathesis.volleylistview.model;

public class Movie {
    private String item_image, item_name, item_category, item_serve;

    private double item_price;

    public Movie(){

    }

    public Movie(String item_image, String item_name, String item_category, String item_serve, double item_price) {
        this.item_image = item_image;
        this.item_name = item_name;
        this.item_category = item_category;
        this.item_serve = item_serve;
        this.item_price = item_price;
    }

    public String getItem_image() {
        return item_image;
    }

    public void setItem_image(String item_image) {
        this.item_image = item_image;
    }

    public String getItem_name() {
        return item_name;
    }

    public void setItem_name(String item_name) {
        this.item_name = item_name;
    }

    public String getItem_category() {
        return item_category;
    }

    public void setItem_category(String item_category) {
        this.item_category = item_category;
    }

    public String getItem_serve() {
        return item_serve;
    }

    public void setItem_serve(String item_serve) {
        this.item_serve = item_serve;
    }

    public double getItem_price() {
        return item_price;
    }

    public void setItem_price(double item_price) {
        this.item_price = item_price;
    }
}

这是我的MainActivity文件

import android.app.Activity;
import android.app.ProgressDialog;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ListView;

import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.VolleyLog;
import com.android.volley.toolbox.JsonArrayRequest;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.util.ArrayList;
import java.util.List;

import aquib.lathesis.volleylistview.adapter.CustomListAdapter;
import aquib.lathesis.volleylistview.app.AppController;
import aquib.lathesis.volleylistview.model.Movie;


public class MainActivity extends Activity {

    // Log tag
    private static final String TAG = MainActivity.class.getSimpleName();

    // Movies json url
    private static final String url = "http://labs.kamkazi.com/aquib/buenomobileapp/jsonparseitems.txt";
    private ProgressDialog pDialog;
    private List<Movie> movieList = new ArrayList<Movie>();
    private ListView listView;
    private CustomListAdapter adapter;

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

        listView = (ListView) findViewById(R.id.list);
        adapter = new CustomListAdapter(this, movieList);
        listView.setAdapter(adapter);

        pDialog = new ProgressDialog(this);
        // Showing progress dialog before making http request
        pDialog.setMessage("Loading...");
        pDialog.show();

        // changing action bar color
        getActionBar().setBackgroundDrawable(
                new ColorDrawable(Color.parseColor("#1b1b1b")));

        // Creating volley request obj
        JsonArrayRequest movieReq = new JsonArrayRequest(url,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        Log.d(TAG, response.toString());
                        hidePDialog();

                        // Parsing json
                        for (int i = 0; i < response.length(); i++) {
                            try {

                                JSONObject obj = response.getJSONObject(i);
                                Movie movie = new Movie();

                                movie.setItem_image(obj.getString("item_image"));
                                movie.setItem_name(obj.getString("item_name"));

                                movie.setItem_category(obj.getString("item_category"));
                                movie.setItem_serve(obj.getString("item_serve"));
                                movie.setItem_price(((Number) obj.get("item_price"))
                                        .doubleValue());

                                 // adding movie to movies array
                                movieList.add(movie);

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                        }

                        // notifying list adapter about data changes
                        // so that it renders the list view with updated data
                        adapter.notifyDataSetChanged();
                    }
                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                VolleyLog.d(TAG, "Error: " + error.getMessage());
                hidePDialog();
            }
        });
        // Adding request to request queue
        AppController.getInstance().addToRequestQueue(movieReq);
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        hidePDialog();
    }

    private void hidePDialog() {
        if (pDialog != null) {
            pDialog.dismiss();
            pDialog = null;
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

这些是布局文件

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:divider="@color/list_divider"
        android:dividerHeight="1dp"
        android:listSelector="@drawable/list_row_selector" >

        </ListView>

</RelativeLayout>

list_row.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/list_row_selector"
    android:padding="8dp" >

    <com.android.volley.toolbox.NetworkImageView
        android:id="@+id/item_image"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_alignParentLeft="true"
        android:layout_marginRight="8dp" />

    <!-- Name -->
    <TextView
        android:id="@+id/item_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/item_image"
        android:layout_toRightOf="@+id/item_image"
        android:textSize="@dimen/title"
        android:textStyle="bold" />

    <!-- Category -->
    <TextView
        android:id="@+id/item_category"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/item_name"
        android:layout_marginTop="1dip"
        android:layout_toRightOf="@+id/item_image"
        android:textSize="@dimen/rating" />

    <!-- Serve -->
    <TextView
        android:id="@+id/item_serve"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/item_category"
        android:layout_marginTop="5dp"
        android:layout_toRightOf="@+id/item_image"
        android:textColor="@color/genre"
        android:textSize="@dimen/genre" />

    <!-- Price-->
    <TextView
        android:id="@+id/item_price"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:textColor="@color/year"
        android:textSize="@dimen/year" />



</RelativeLayout>

singlelistview.xml

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/list_row_selector"
    android:padding="8dp">

    <com.android.volley.toolbox.NetworkImageView
        android:id="@+id/itemImage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_marginRight="8dp"/>

    <!-- Name -->
    <TextView
        android:id="@+id/itemName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignTop="@+id/itemImage"
        android:layout_toRightOf="@+id/itemImage"
        android:textSize="@dimen/title"
        android:textStyle="bold" />

    <!-- Category -->
    <TextView
        android:id="@+id/itemCategory"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/itemName"
        android:layout_marginTop="1dip"
        android:layout_toRightOf="@+id/itemImage"
        android:textSize="@dimen/rating" />

    <!-- Serve -->
    <TextView
        android:id="@+id/itemServe"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/itemCategory"
        android:layout_marginTop="5dp"
        android:layout_toRightOf="@+id/itemImage"
        android:textColor="@color/genre"
        android:textSize="@dimen/genre" />

    <!-- Price-->
    <TextView
        android:id="@+id/itemPrice"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:textColor="@color/year"
        android:textSize="@dimen/year" />



</RelativeLayout>

当我运行我的应用程序时，第一个活动显示整个列表视图很好。但是当我点击一行并打开其他活动时，除了价格视图之外什么都没有显示。价格文本视图也没有正确显示。请帮助我..