我想在Android的回收站中顯示Json的數據

Question

我想在其他活動中顯示評論文本及其評分。

這裏是我AddReview類

public class AddReview extends AppCompatActivity implements ServerRequests.AddReviewreponse { 
    private Button submit; 
    EditText addReview; 
    RatingBar ratingBar; 
    Toolbar toolbar; 

    ServerRequests serverRequests; 
    JSONParser jsonParser; 

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

     jsonParser = new JSONParser(); 
     serverRequests = new ServerRequests(getApplicationContext()); 
     serverRequests.setAddReviewreponse(this); 


     addReview=(EditText)findViewById(R.id.reviewBox); 
     ratingBar=(RatingBar) findViewById(R.id.ratingBar); 

     submit=(Button)findViewById(R.id.submit); 
     toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.toolbar_top); 

     setSupportActionBar(toolbar); 
     getSupportActionBar().setHomeButtonEnabled(true); 
     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     getSupportActionBar().setTitle("Add Review"); 


     // toolbar.setNavigationIcon(R.drawable.back_30); 

     /* toolbar.setNavigationOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       onBackPressed(); 
      } 
     });*/ 



     submit.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 

       try { 

        String ReviewTxt = addReview.getText().toString(); 
        float rating = ratingBar.getRating(); 

        JSONObject obj = jsonParser.makeAddReviewJson(1,1,ReviewTxt,rating); 
        Log.e("final Json", obj.toString()); 
        serverRequests.addReview(obj); 

       } catch (Exception e) { 

       } 


       /* Reviews.displayName.setText(RegisterActivity.name.getText().toString()); 

       Reviews.displayReview.setText("Your Review : "+addReview.getText().toString()); 

       Reviews.displayStars.setRating(ratingBar.getRating());*/ 

       /* Reviews.displayStars.setText("Your Rating : " + ratingBar.getRating()); 
       String currentDateTimeString = DateFormat.getDateTimeInstance().format(new Date()); 
       Reviews.displayDate.setText(currentDateTimeString);*/ 


       AlertDialog alertDialog = new AlertDialog.Builder(AddReview.this).create(); 

       alertDialog.setTitle("Review Submitted!"); 

       alertDialog.setMessage("Thanks for your valueable review!"); 

       alertDialog.setIcon(R.drawable.star_48); 

       alertDialog.setButton("OK", new DialogInterface.OnClickListener() { 
        public void onClick(DialogInterface dialog, int which) { 
         // Write your code here to execute after dialog closed 
         Toast.makeText(getApplicationContext(), "You clicked on OK", Toast.LENGTH_SHORT).show(); 
        // startActivity(new Intent(getApplicationContext(), Reviews.class)); 
        } 
       }); 

       // Showing Alert Message 
       alertDialog.show(); 

      } 
     }); 
    } 

    @Override 
    public void onAddReviewReposne(JSONObject object) { 

    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     if(item.getItemId()==android.R.id.home) 
     { 
      finish(); 
     } 
     return super.onOptionsItemSelected(item); 
    } 
} 

這是複習課堂，我想顯示的審查和評級

public class Reviews extends AppCompatActivity implements ServerRequests.GetReviewResponse { 

    public static TextView displayReview, displayDate, displayName; 
    public static RatingBar displayStars; 
    Button addReviewBtn; 
    android.support.v7.widget.Toolbar toolbar; 

    private RecyclerView mRecyclerView; 
    private RecyclerView.Adapter mAdapter; 
    private RecyclerView.LayoutManager mLayoutManager; 
    private static String LOG_TAG = "CardViewActivity"; 

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

     mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view1); 
     mRecyclerView.setHasFixedSize(true); 
     mLayoutManager = new LinearLayoutManager(this); 
     mRecyclerView.setLayoutManager(mLayoutManager); 
    // mAdapter = new ReviewAdapter(getDataSet(jsonObject)); 
     mRecyclerView.setAdapter(mAdapter); 


     toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.toolbar_top1); 

     setSupportActionBar(toolbar); 
     getSupportActionBar().setHomeButtonEnabled(true); 
     getSupportActionBar().setDisplayHomeAsUpEnabled(true); 
     getSupportActionBar().setTitle("Reviews"); 


     /*displayReview = (TextView) findViewById(R.id.review); 
     displayStars = (RatingBar) findViewById(R.id.rating); 
     displayDate = (TextView)findViewById(R.id.displayDate); 
     displayName = (TextView)findViewById(R.id.displayName);*/ 

     addReviewBtn = (Button)findViewById(R.id.addReviewBtn); 
     addReviewBtn.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       startActivity(new Intent(getApplicationContext(), AddReview.class)); 
      } 
     }); 

     ServerRequests serverRequests=new ServerRequests(getApplicationContext()); 
     serverRequests.setReviewResponse(this); 
     serverRequests.getReviews("one"); 

    } 


    private ArrayList<Review> getDataSet(JSONArray array) { 
     ArrayList results = new ArrayList<Review>(); 
     for (int i = 0; i < array.length(); i++) { 
      try { 
       JSONObject object = array.getJSONObject(i); 
       Review obj = new Review(object.getInt("reviewId"),object.getInt("userId"),object.getString("Name"),object.getString("Review"),object.getLong("rating")); 
       results.add(i,obj); 

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

     } 
     return results; 
    } 


    @Override 
    public void onGetReviewResponse(JSONArray jsonObject) { 

     mAdapter = new ReviewAdapter(getDataSet(jsonObject)); 
     mRecyclerView.setAdapter(mAdapter); 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     if(item.getItemId()==android.R.id.home) 
     { 
      finish(); 
     } 
     return super.onOptionsItemSelected(item); 
    } 
} 

這是ReviewAdapter

public class ReviewAdapter extends RecyclerView.Adapter<ReviewAdapter.DataObjectHolder> { 
    private static String LOG_TAG = "MyRecyclerViewAdapter"; 
    private ArrayList<Review> mDataset; 
    private static MyClickListener myClickListener; 

    public static class DataObjectHolder extends RecyclerView.ViewHolder implements View.OnClickListener { 
     public static TextView name,review; 
     public static RatingBar rating; 

     public DataObjectHolder(View itemView) { 
      super(itemView); 
      name = (TextView) itemView.findViewById(R.id.name); 
      review = (TextView) itemView.findViewById(R.id.review); 
      rating = (RatingBar) itemView.findViewById(R.id.rating); 
      Log.i(LOG_TAG, "Adding Listener"); 
      itemView.setOnClickListener(this); 
     } 

     @Override 
     public void onClick(View v) { 
      myClickListener.onItemClick(getAdapterPosition(), v); 
     } 
    } 

    public void setOnItemClickListener(MyClickListener myClickListener) { 
     this.myClickListener = myClickListener; 
    } 

    public ReviewAdapter(ArrayList<Review> myDataset) { 
     mDataset = myDataset; 
    } 

    @Override 
    public DataObjectHolder onCreateViewHolder(ViewGroup parent, 
               int viewType) { 
     View view = LayoutInflater.from(parent.getContext()) 
       .inflate(R.layout.card_view_review, parent, false); 

     DataObjectHolder dataObjectHolder = new DataObjectHolder(view); 
     return dataObjectHolder; 
    } 

    @Override 
    public void onBindViewHolder(DataObjectHolder holder, int position) { 
     holder.name.setText(mDataset.get(position).getName()); 
     holder.review.setText(mDataset.get(position).getReview()); 
     holder.rating.setRating(mDataset.get(position).getRating()); 
    } 

    public void addItem(Review dataObj, int index) { 
     mDataset.add(index, dataObj); 
     notifyItemInserted(index); 
    } 

    public void deleteItem(int index) { 
     mDataset.remove(index); 
     notifyItemRemoved(index); 
    } 

    @Override 
    public int getItemCount() { 
     return mDataset.size(); 
    } 

    public interface MyClickListener { 
     public void onItemClick(int position, View v); 
    } 
} 

這是Pojo評論類

public class Review { 
    private String name,review; 
    private float rating; 
    private int reviewId,userId; 

    public Review (int ReviewId, int UserId, String Name, String Review, float Rating){ 
     reviewId = ReviewId; 
     userId = UserId; 
     name = Name; 
     review = Review; 
     rating = Rating; 

    } 

    public int getReviewId() { 
     return reviewId; 
    } 

    public void setReviewId(int reviewId) { 
     this.reviewId = reviewId; 
    } 


    public int getUserId() { 
     return userId; 
    } 

    public void setUserId(int userId) { 
     this.userId = userId; 
    } 



    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public String getReview() { 
     return review; 
    } 

    public void setReview(String review) { 
     this.review = review; 
    } 

    public float getRating() { 
     return rating; 
    } 

    public void setRating(float rating) { 
     this.rating = rating; 
    } 


} 

這是添加ServerRequests並獲得審查

//------------For add review------------------------------ 

    public void setAddReviewreponse(AddReviewreponse addreviewreponse) { 
     this.addreviewreponse = addreviewreponse; 
    } 

    private AddReviewreponse addreviewreponse; 

    public interface AddReviewreponse { 
     void onAddReviewReposne(JSONObject object); 
    } 

    public void addReview(JSONObject jsonObject) { 


     JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, Services.ADD_REVIEW, jsonObject, 
       new Response.Listener<JSONObject>() { 
        @Override 
        public void onResponse(JSONObject response) { 
         try { 
          Log.e("Json response", "" + response); 
          boolean b = response.getBoolean("success"); 

          if (addreviewreponse != null) { 
           addreviewreponse.onAddReviewReposne(response); 

          } 

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

       }, 
       new Response.ErrorListener() { 
        @Override 
        public void onErrorResponse(VolleyError error) { 
         Log.e("Error ", "" + error); 
        } 
       } 
     ); 

     queue.add(jsonObjectRequest); 
    } 

    //------------For get review------------------------------ 

    public void setReviewResponse(GetReviewResponse reviewResponse) { 
     this.getReviewResponse = reviewResponse; 
    } 

    public GetReviewResponse getReviewResponse; 

    public interface GetReviewResponse { 
     void onGetReviewResponse(JSONArray jsonObject); 
    } 

    public void getReviews(final String id) { 

     StringRequest request = new StringRequest(Request.Method.GET, Services.GET_REVIEW, 
       new Response.Listener<String>() { 
        @Override 
        public void onResponse(String response) { 
         try { 
          JSONArray array = new JSONArray(response); 
          Log.e("Server response", response); 
          if (array.length() > 0) { 
           if (getReviewResponse != null) { 
            getReviewResponse.onGetReviewResponse(array); 
           } 

          } else { 
           Log.e("Error is occured", "asd"); 

          } 


         } catch (Exception e) { 

          e.printStackTrace(); 
         } 
        } 
       }, new Response.ErrorListener() { 
      @Override 
      public void onErrorResponse(VolleyError error) { 
       //send error repsonse back to user 
       Log.e("Error: ", error.getMessage()); 

      } 
     }) { 
      @Override 
      protected Map<String, String> getParams() throws AuthFailureError { 
       HashMap<String, String> params = new HashMap<>(); 
       params.put("courseId", id); 
       return params; 

      } 
     }; 
     queue.add(request); 
    } 

這是AddReview

//--------For Add review--------------------------------- 

    public JSONObject makeAddReviewJson(int studentID, int courseID, String reviewTxt, float rating) throws JSONException { 

     JSONObject object = new JSONObject(); 

     object.put("studentId", studentID); 
     object.put("courseId", courseID); 
     object.put("review", reviewTxt); 
     object.put("ratings", rating); 
     return object; 
    } 

JSONParser類這是JSON響應我張貼審查

E/final Json: {"studentId":1,"courseId":1,"review":"Hellooooo","ratings":3} 
E/Json response: {"success":true,"msg":"Your review has been added successfully","data":{"reviewsId":18}} 

後得到

Answer 1

private ArrayList<Review> getDataSet(JSONArray array) { 
     ArrayList results = new ArrayList<Review>(); 
     for (int i = 0; i < array.length(); i++) { 
      try { 
       JSONObject object = array.getJSONObject(i); 
       Review obj = new Review(object.getInt("studentId"),object.getInt("courseId"),object.getString("Review"),object.getLong("rating")); 
       results.add(i,obj); 

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

     } 
     return results; 
    } 

嘗試使用上面的代碼更改您的getDataSet函數，並檢查調試點，如果您在某行中遇到任何問題。隨意問進一步將幫助您

編輯：

你需要改變你的POJO類的評論也。因爲在JSON響應中你沒有得到userId和reviewId。希望你明白