我有被填充到一个活动（Main.java）。一个JSON文件

此活动显示了我的JSON项从URL 3随机图像。

我想要做的是：我对我的JSON，每当我点击它转到包含图片，标题另一个活动（ProjectDetail.java）所示随机​​图片13不同的条目，并说明取决于我点击项目根据它的JSON条目。

什么我有是使用额外的由我不知道究竟如何，因为我使用JSON来执行。我应该加入到我的 top_listener 方法对我的主类，我应该加入到我的ProjectDetail类？

感谢您。

Main.java

 公共类主要活动扩展{            / **当第一次创建活动调用。 * /            ArrayList的＆LT;项目＆GT; prjcts = NULL;            私人ImageThreadLoader ImageLoader的=新ImageThreadLoader（）;            私人最终静态字符串变量=MediaItemAdapter;            @覆盖            公共无效的onCreate（捆绑savedInstanceState）{                super.onCreate（savedInstanceState）;                的setContentView（R.layout.main）;                prjcts =新的ArrayList＆LT;项目＆GT;（）;                WebService的web服务=新的WebService（http://liebenwald.spendino.net/admanager/dev/android/projects.json）;                地图＆LT;字符串，字符串＆GT; PARAMS =新的HashMap＆LT;字符串，字符串＆GT;（）;                params.put（变种，）;                字符串的响应= webService.webGet（，则params）;                尝试                {                    键入collectionType =新TypeToken＆LT; ArrayList的＆LT;项目及GT;＆GT;（）{}的getType（）。                    清单＆LT;项目＆GT; 。LST =新GSON（）fromJson（响应，collectionType）;                    对于（项目L：LST）                    {                        prjcts.add（升）;                        ConstantData.projectsList.add（升）;                    }                }                赶上（例外五）                {                    Log.d（错误，e.getMessage（））;                }                最终巴顿项目=（按钮）findViewById（R.id.btn_projectslist）;                最终按钮的相关信息=（按钮）findViewById（R.id.btn_infos）;                最终按钮触点=（按钮）findViewById（R.id.btn_contact）;                project.setOnClickListener（project_listener）;                infos.setOnClickListener（infos_listener）;                contact.setOnClickListener（contact_listener）;                ImageView的image1的;                ImageView的IMAGE2;                ImageView的图像3;                尝试{                    此搜索=（ImageView的）findViewById（R.id.top1）;                    IMAGE2 =（ImageView的）findViewById（R.id.top2）;                    图像3 =（ImageView的）findViewById（R.id.top3）;                  }赶上（抛出ClassCastException E）{                    Log.e（TAG，你的布局必须提供图像，并与ID的图标和文字文本视图，E）;                    Ë扔掉;                  }                  位图cachedImage1 = NULL;                  位图cachedImage2 = NULL;                  位图cachedImage3 = NULL;                  //随机图像项的索引                  INT最大= prjcts.size（）;                  清单＆LT;整数GT;指数=新的ArrayList＆LT;整数GT;（最大值）;                  对（INT C = 0;℃下最大++三）                  {                      indices.add（C）;                  }                  INT arrIndex =（INT）（（双）indices.size（）*的Math.random（））;                  INT randomIndex1 = indices.get（arrIndex）;                  indices.remove（arrIndex）;                  INT randomIndex2 = indices.get（arrIndex）;                  indices.remove（arrIndex）;                  INT randomIndex3 = indices.get（arrIndex）;                  indices.remove（arrIndex）;                  setImage（cachedImage1，此搜索，prjcts.get（randomIndex1））;                  setImage（cachedImage2，图像2，prjcts.get（randomIndex2））;                  setImage（cachedImage3，为image3，prjcts.get（randomIndex3））;                  image1.setOnClickListener（top_listener）;                  image2.setOnClickListener（top_listener）;                  image3.setOnClickListener（top_listener）;            }            公共无效setImage（位图cachedImage，最终ImageView的形象，项目PRO）            {                //位图cachedImage1 = NULL;                尝试{                    cachedImage = imageLoader.loadImage（pro.smallImageUrl，新ImageLoadedListener（）                    {                        公共无效imageLoaded（位图imageBitmap）                        {                            image.setImageBitmap（imageBitmap）;                            // notifyDataSetChanged（）;                        }                    }）;                }赶上（MalformedURLException的E）{                    Log.e（TAG，坏遥感图像URL：+ pro.smallImageUrl，E）;                }                如果（cachedImage！= NULL）{                    image.setImageBitmap（cachedImage）;                  }            }            私人OnClickListener top_listener =新OnClickListener（）{                公共无效的onClick（视图v）{                            意图顶部=新意图（Main.this，InfosActivity.class）;                            startActivity（顶部）;                }                }; 

ProjectDetail.java

 公共类ProjectDetail扩展活动实现OnClickListener {    @覆盖    公共无效的onCreate（捆绑savedInstanceState）{        super.onCreate（savedInstanceState）;        的setContentView（R.layout.project）;        按钮weitersagen =（按钮）findViewById（R.id.btn_weitersagen）;        weitersagen.setOnClickListener（本）;        按钮短信=（按钮）findViewById（R.id.btn_sms_spenden）;        sms.setOnClickListener（本）;        INT位置= getIntent（）getExtras（）调用getInt（spendino.de.ProjectDetail.position）。;        项目项目= ConstantData.projectsList.get（位置）;      尝试{          ImageView的projectImage =（ImageView的）findViewById（R.id.project_image）;          位图位图= BitmapFactory.de codeStream（（InputStream的）新的URL（project.bigImageUrl）.getContent（））;          projectImage.setImageBitmap（位图）;        }赶上（MalformedURLException的E）{          e.printStackTrace（）;        }赶上（IOException异常五）{          e.printStackTrace（）;        }      TextView的PROJECT_TITLE =（的TextView）findViewById（R.id.txt_project_title）;      project_title.setText（project.project_title）;      TextView的ORGANIZATION_TITLE =（的TextView）findViewById（R.id.txt_organization_title）;      organization_title.setText（Html.fromHtml（冯+ project.organization_title））;      TextView的project_description =（的TextView）findViewById（R.id.txt_project_description）;      project_description.setText（Html.fromHtml（project.project_description））;    } 

我也有这个 ConstantData.java ，其持有我的JSON性能指标：

 公共类ConstantData {   公共静态字符串PROJECT_TITLE =项目名称;   公共静态字符串ORGANIZATION_TITLE =单位名称;   公共静态字符串关键字=关键词;   公共静态字符串short_ code =短code;   公共静态字符串project_description =说明;   公共静态字符串smallImageUrl =smallImageUrl;   公共静态字符串bigImageUrl =bigImageUrl;   公共静态字符串价=价格;   公共静态字符串国家=国家;    公共静态的ArrayList＆LT;项目＆GT; projectsList =新的ArrayList＆LT;项目＆GT;（）;    公众诠释describeContents（）{        返回0;    }    公共无效writeToParcel（包裹出来，诠释标志）{        out.writeString（PROJECT_TITLE）;        out.writeString（ORGANIZATION_TITLE）;        out.writeString（关键字）;        out.writeString（short_ code）;        out.writeString（project_description）;        out.writeString（smallImageUrl）;        out.writeString（bigImageUrl）;        out.writeString（价）;        out.writeString（国家）;    }    公共静态最终Parcelable.Creator＆LT; ConstantData＆GT; CREATOR            =新Parcelable.Creator＆LT; ConstantData＆GT;（）{        公共ConstantData createFromParcel（包裹中）{            返回新ConstantData（中）;        }        公共ConstantData [] newArray（INT大小）{            返回新ConstantData【尺寸】;        }    };    私人ConstantData（包裹中）{        PROJECT_TITLE = in.readString（）;        ORGANIZATION_TITLE = in.readString（）;        关键字= in.readString（）;        short_ code = in.readString（）;        project_description = in.readString（）;        smallImageUrl = in.readString（）;        bigImageUrl = in.readString（）;        价格= in.readString（）;        国家= in.readString（）;    }} 

解决方案

您可以使类ConstantData由Parcelable扩展和实现两个方法（可串行看到的文档）。然后，你可以通过做传递一个constantData实例作为一个额外的

  intent.putExtra（jsonData，constantDataInstance）; 

和从其他活动中检索它（在它的onCreate（）方法）与

  getIntent（）getExtras（）getParcelable（jsonData）。; 

否则，你可能只是过去那样额外各个领域的独立，但它是一个烂摊子。这种方式不仅更易于阅读和一切，但精心设计。

I have a JSON file which is populated to an activity (Main.java).

This Activity shows 3 random images from the URL on my JSON entries.

What I wanna do is: I have 13 different entries on the my JSON, whenever I click the shown random picture it goes to another activity (ProjectDetail.java) containing the picture,title,and description depends on the item I click based on its entry on the JSON.

What do I have in is by using extra by I dont know exactly how to perform that since I'm using JSON. What should I add into my top_listener method on my Main class and what should I add into my ProjectDetail class?

Thank you.

Main.java

   public class Main extends Activity {
            /** Called when the activity is first created. */

            ArrayList<Project> prjcts=null;
            private ImageThreadLoader imageLoader = new ImageThreadLoader();
            private final static String TAG = "MediaItemAdapter";


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

                prjcts = new ArrayList<Project>();
                WebService webService = new WebService("http://liebenwald.spendino.net/admanager/dev/android/projects.json");
                Map<String, String> params = new HashMap<String, String>();
                params.put("var", "");
                String response = webService.webGet("", params);

                try
                {
                    Type collectionType = new TypeToken<ArrayList<Project>>(){}.getType();
                    List<Project> lst= new Gson().fromJson(response, collectionType);
                    for(Project l : lst)
                    {
                        prjcts.add(l);
                        ConstantData.projectsList.add(l);
                    }
                }
                catch(Exception e)
                {
                    Log.d("Error: ", e.getMessage());
                }

                final Button project = (Button) findViewById(R.id.btn_projectslist);
                final Button infos = (Button) findViewById(R.id.btn_infos);
                final Button contact = (Button) findViewById(R.id.btn_contact);
                project.setOnClickListener(project_listener);
                infos.setOnClickListener(infos_listener);
                contact.setOnClickListener(contact_listener);

                ImageView image1;
                ImageView image2;
                ImageView image3;

                try {
                    image1 = (ImageView)findViewById(R.id.top1);
                    image2 = (ImageView)findViewById(R.id.top2);
                    image3 = (ImageView)findViewById(R.id.top3);
                  } catch( ClassCastException e ) {
                    Log.e(TAG, "Your layout must provide an image and a text view with ID's icon and text.", e);
                    throw e;
                  }


                  Bitmap cachedImage1 = null;
                  Bitmap cachedImage2 = null;
                  Bitmap cachedImage3 = null;

                  //randomize the index of image entry

                  int max = prjcts.size();
                  List<Integer> indices = new ArrayList<Integer>(max);
                  for(int c = 0; c < max; ++c)
                  {
                      indices.add(c);
                  }

                  int arrIndex = (int)((double)indices.size() * Math.random());
                  int randomIndex1 = indices.get(arrIndex);
                  indices.remove(arrIndex);


                  int randomIndex2 = indices.get(arrIndex);
                  indices.remove(arrIndex);


                  int randomIndex3 = indices.get(arrIndex);
                  indices.remove(arrIndex);



                  setImage(cachedImage1, image1, prjcts.get(randomIndex1));
                  setImage(cachedImage2, image2, prjcts.get(randomIndex2));
                  setImage(cachedImage3, image3, prjcts.get(randomIndex3));

                  image1.setOnClickListener(top_listener);
                  image2.setOnClickListener(top_listener);
                  image3.setOnClickListener(top_listener);
            }



            public void setImage(Bitmap cachedImage, final ImageView image, Project pro)
            {
                //Bitmap cachedImage1 = null;
                try {
                    cachedImage = imageLoader.loadImage(pro.smallImageUrl, new ImageLoadedListener() 
                    {
                        public void imageLoaded(Bitmap imageBitmap)
                        {
                            image.setImageBitmap(imageBitmap);
                            //notifyDataSetChanged();                
                        }
                    });
                } catch (MalformedURLException e) {
                    Log.e(TAG, "Bad remote image URL: " + pro.smallImageUrl, e);
                }
                if( cachedImage != null ) {
                    image.setImageBitmap(cachedImage);
                  }
            }


            private OnClickListener top_listener = new OnClickListener() {
                public void onClick(View v) {
                            Intent top = new Intent(Main.this, InfosActivity.class);
                            startActivity(top);
                }
                };

ProjectDetail.java

public class ProjectDetail extends Activity implements OnClickListener{


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

        Button weitersagen = (Button) findViewById(R.id.btn_weitersagen);
        weitersagen.setOnClickListener(this);

        Button sms = (Button) findViewById(R.id.btn_sms_spenden);
        sms.setOnClickListener(this);

        int position = getIntent().getExtras().getInt("spendino.de.ProjectDetail.position");
        Project project = ConstantData.projectsList.get(position);


      try {
          ImageView projectImage = (ImageView)findViewById(R.id.project_image);
          Bitmap bitmap = BitmapFactory.decodeStream((InputStream)new URL(project.bigImageUrl).getContent());
          projectImage.setImageBitmap(bitmap); 
        } catch (MalformedURLException e) {
          e.printStackTrace();
        } catch (IOException e) {
          e.printStackTrace();
        } 

      TextView project_title = (TextView)findViewById(R.id.txt_project_title);
      project_title.setText(project.project_title);

      TextView organization_title = (TextView)findViewById(R.id.txt_organization_title);
      organization_title.setText(Html.fromHtml("von " +project.organization_title));

      TextView project_description = (TextView)findViewById(R.id.txt_project_description);
      project_description.setText(Html.fromHtml(project.project_description));

    }

I also have this ConstantData.java, the index which holds my JSON properties:

 public class ConstantData{

   public static String project_title = "project title";
   public static String organization_title = "organization title";
   public static String keyword = "keyword";
   public static String short_code = "short code";
   public static String project_description = "description";
   public static String smallImageUrl = "smallImageUrl";
   public static String bigImageUrl = "bigImageUrl";
   public static String price= "price";
   public static String country= "country";



    public static ArrayList<Project> projectsList = new ArrayList<Project>();


    public int describeContents() {
        return 0;
    }

    public void writeToParcel(Parcel out, int flags) {
        out.writeString(project_title);
        out.writeString(organization_title);
        out.writeString(keyword);
        out.writeString(short_code);
        out.writeString(project_description);
        out.writeString(smallImageUrl);
        out.writeString(bigImageUrl);
        out.writeString(price);
        out.writeString(country);
    }

    public static final Parcelable.Creator<ConstantData> CREATOR
            = new Parcelable.Creator<ConstantData>() {
        public ConstantData createFromParcel(Parcel in) {
            return new ConstantData(in);
        }

        public ConstantData[] newArray(int size) {
            return new ConstantData[size];
        }
    };

    private ConstantData(Parcel in) {
        project_title = in.readString();
        organization_title = in.readString();
        keyword = in.readString();
        short_code = in.readString();
        project_description = in.readString();
        smallImageUrl = in.readString();
        bigImageUrl = in.readString();
        price = in.readString();
        country = in.readString();
    }
}

You could make the class ConstantData serializable by extending from Parcelable and implementing a couple of methods (see the documentation). Then you could pass a constantData instance as an extra by doing

intent.putExtra("jsonData", constantDataInstance);

and retrieving it from the other activity (in it's onCreate() method) with

getIntent().getExtras().getParcelable("jsonData");

Otherwise you could just past as extra every field independently, but it would be a mess. This way is not only more easy to read and everything, but "well designed".