java - 以 JSON 格式将行值发送到 Web 服务 (Android)

Question

Rating Activity

任务:应用程序正在接收 JSON 格式的值，并且学生姓名和当前评分在 ListView 中动态填充。现在，应用程序需要以 JSON 格式发送个别学生的评分和评论。问题:Rating 和 comment 中给出的值可以在 Adapter 类中检索(其中填充了一行)，但不能在此类外部访问。我想在 ListView.onClickListener 方法中访问这些值。

这是适配器类:

class StudentAdapter extends BaseAdapter {

    ArrayList<Student> studentList;
    ArrayList<Student> studentList1;
    LayoutInflater inflater;

    public StudentAdapter(ArrayList<Student> studentList) {
        this.studentList = studentList;
        inflater = LayoutInflater.from(RatingActivity.this);
    }

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

    @Override
    public Object getItem(int position) {
        return studentList.get(position);
    }

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

    @Override
    public View getView(final int position, View convertView, ViewGroup parent)
    {
        final View row = inflater.inflate(R.layout.rowactivity3, parent, false);
        //  TextView id = (TextView) row.findViewById(R.id.tvId);
        TextView name = (TextView) row.findViewById(R.id.tvName);
        final RatingBar rv=(RatingBar)row.findViewById(R.id.ratingBar);
        final RatingBar rv1=(RatingBar)row.findViewById(R.id.ratingBar1);
        final Button b1=(Button)row.findViewById(R.id.btnDialog);
        final String[] values = {null,null};
        name.setText(studentList.get(position).getSname());
        rv1.setRating(studentList.get(position).getRate());
        b1.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder = new AlertDialog.Builder(RatingActivity.this);
                builder.setTitle("Comment here:");

                final EditText input = new EditText(RatingActivity.this);
                input.setInputType(InputType.TYPE_CLASS_TEXT |InputType.TYPE_CLASS_TEXT);
                builder.setView(input);

                builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        m_Text = input.getText().toString();
                        Log.d("comment",m_Text);
                        values[0]=m_Text;
                        b1.setBackgroundColor(Color.BLUE);
                    }
                });
                builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        dialog.cancel();
                    }
                });
                builder.show();
            }
        });
        return row;
    }
}

这是单行布局:

<TextView
    android:layout_margin="8dp"
    android:id="@+id/tvName"
    android:text="enter name.."
    android:padding="12dp"
    android:layout_width="220dp"
    android:layout_height="wrap_content"
    android:textAppearance="@style/Base.TextAppearance.AppCompat.Medium"/>
<RatingBar
    android:id="@+id/ratingBar"
    style="@style/customRatingBar"
    android:layout_marginLeft="15dp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:focusable="false"
    android:focusableInTouchMode="false"
    android:numStars="5"
    android:stepSize="0.1" />
<Button
    android:id="@+id/btnDialog"
    android:layout_width="100dp"
    android:layout_height="wrap_content"
    android:layout_marginLeft="70dp"
    android:text="Click"/>
<RatingBar
    android:id="@+id/ratingBar1"
    android:layout_marginLeft="80dp"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:numStars="5"
    android:isIndicator="true"
    android:stepSize="0.1" />

Answer 1

试试这个:

1. 创建界面

   public interface AdapterItemClickListener {
      void AdapterItemClicked(int position, Bundle data);
   }
   

2. 然后在您的适配器类中添加代码:

   class StudentAdapter extends BaseAdapter {
   
   ArrayList<Student> studentList;
   ArrayList<Student> studentList1;
   LayoutInflater inflater;
   AdapterItemClickListener adapterItemClickListener;
   
   public StudentAdapter(ArrayList<Student> studentList) {
   this.studentList = studentList;
   inflater = LayoutInflater.from(RatingActivity.this);
   }
   
   @Override
   public int getCount() {
   return studentList.size();
   }
   
   @Override
   public Object getItem(int position) {
   return studentList.get(position);
   }
   
   @Override
   public long getItemId(int position) {
   return position;
   }
   
   @Override
   public View getView(final int position, View convertView,     ViewGroup parent)
   {
   final View row = inflater.inflate(R.layout.rowactivity3, parent, false);
   //  TextView id = (TextView) row.findViewById(R.id.tvId);
   TextView name = (TextView) row.findViewById(R.id.tvName);
   final RatingBar rv=(RatingBar)row.findViewById(R.id.ratingBar);
   final RatingBar rv1=(RatingBar)row.findViewById(R.id.ratingBar1);
   final Button b1=(Button)row.findViewById(R.id.btnDialog);
   final String[] values = {null,null};
   name.setText(studentList.get(position).getSname());
   rv1.setRating(studentList.get(position).getRate());
   b1.setOnClickListener(new View.OnClickListener()
   {
       @Override
       public void onClick(View v) {
           AlertDialog.Builder builder = new AlertDialog.Builder(RatingActivity.this);
           builder.setTitle("Comment here:");
   
           final EditText input = new EditText(RatingActivity.this);
           input.setInputType(InputType.TYPE_CLASS_TEXT |InputType.TYPE_CLASS_TEXT);
           builder.setView(input);
   
           builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
               @Override
               public void onClick(DialogInterface dialog, int which) {
                   m_Text = input.getText().toString();
                   Log.d("comment",m_Text);
                   values[0]=m_Text;
                   b1.setBackgroundColor(Color.BLUE); 
            //pass your data in bundle and pass adapter position 
        adapterItemClickListener.AdapterItemClicked(position,bundle); 
        dialog.cancel();  
               }
           });
           builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
               @Override
               public void onClick(DialogInterface dialog, int which) {
                   dialog.cancel();
               }
           });
           builder.show();
       }
   });
   return row;
   }
   
   // create adapter item click listener and call from fragment or activity class
   public void setAdapterItemClickListener(AdapterItemClickListener adapterItemClickListener){
       this.adapterItemClickListener=adapterItemClickListener;
    }
   
   }
   

3. 然后从 fragment 或 Activity 调用 studentAdapter.setAdapterItemClickListener(this) 并覆盖 void AdapterItemClicked(int position, Bundle data); .您可以通过此方法获取 bundle 中的数据。

注意:此代码未经测试。因此，如果您遇到任何问题，请调试并检查。我希望这会奏效。