將CursorAdapter傳遞給另一個CursorAdapter

Question

我有2個ListViews。一個在另一個。當用戶點擊bottomList中的一行時，我正在打一個Web服務並創建一個新的遊標並重新填充bottomList。同時，我想把點擊的行放到TopListView中。我試圖將一個Intent從cursorAdapter傳遞給MainActivity，但這只是用與那裏相同的值重新填充bottomListView。甚至不打電話給Web服務。 TopListView沒有任何反應。

是否可以將onClick從bottomCursorAdapter的位置傳遞給topCursorAdapter？或者像employee_number這樣的一些變量，我可以在TopAdapter和swapCursor中查詢它？如果是這樣，不知道如何交換光標，因爲沒有辦法知道是否有人點擊了topListView中的bottomListView。

我TopList方法

public void displayTopList() { 
     SQLiteDatabase db = dbHandler.getWritableDatabase(); 
     mTopCursor = db.rawQuery("SELECT * FROM " + table + " WHERE " + "Employee_number" + "=" + mStartingEmployeeID, null); 
     ListView mTopListView = (ListView) findViewById(R.id.mTopList); 
     TopListCursorAdapter topAdapter = new TopListCursorAdapter(this, mTopCursor); 
     mTopListView.setAdapter(topAdapter); 
    } 

方法我創建從適配器獲得的數據顯示敬酒

public void onRowClick(String mEmployeeNumber, String mFirstName) { 
     Toast.makeText(getApplicationContext(), "SEND TO TOP LIST " + mEmployeeNumber + " " + mFirstName, Toast.LENGTH_LONG).show(); 
    } 

我TopAdapter，我嘗試添加onRowClick。

public class TopListCursorAdapter extends CursorAdapter { 
    public TopListCursorAdapter(Context context, Cursor cursor) { 
     super(context, cursor, 0); 
    } 

    @Override 
    public View newView(Context context, Cursor cursor, ViewGroup parent) { 
     return LayoutInflater.from(context).inflate(R.layout.contact_cardview_layout, parent, false); 
    } 

    @Override 
    public void bindView(View view, final Context context, final Cursor cursor) { 

     ViewHolder holder; 
     holder = new ViewHolder(); 
     holder.tvFirstName = (TextView) view.findViewById(R.id.personFirstName); 
     holder.tvLastName = (TextView) view.findViewById(R.id.personLastName); 
     holder.tvTitle = (TextView) view.findViewById(R.id.personTitle); 
     holder.mPeepPic = (ImageView) view.findViewById(R.id.person_photo); 
     holder.mDetailsButton = (ImageButton) view.findViewById(R.id.fullDetailButton); 
     holder.mCardView = (CardView) view.findViewById(R.id.home_screen_cardView); 

     String mFirstName = cursor.getString(cursor.getColumnIndexOrThrow("First_name")); 
     String mLastName = cursor.getString(cursor.getColumnIndexOrThrow("Last_name")); 
     String mPayrollTitle = cursor.getString(cursor.getColumnIndexOrThrow("Payroll_title")); 
     String mThumbnail = cursor.getString(cursor.getColumnIndexOrThrow("ThumbnailData")); 

     holder.tvFirstName.setText(mFirstName); 
     holder.tvLastName.setText(mLastName); 
     holder.tvTitle.setText(mPayrollTitle); 

     if (mThumbnail != null) { 
      byte[] imageAsBytes = Base64.decode(mThumbnail.getBytes(), Base64.DEFAULT); 
      Bitmap parsedImage = BitmapFactory.decodeByteArray(imageAsBytes, 0, imageAsBytes.length); 
      holder.mPeepPic.setImageBitmap(parsedImage); 
     } else { 
      holder.mPeepPic.setImageResource(R.drawable.img_place_holder_adapter); 
     } 


     final int position = cursor.getPosition(); 
     holder.mDetailsButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       cursor.moveToPosition(position); 
       String mEmployeeNumber = cursor.getString(1); 
       String mEmail = cursor.getString(8); 
       String mFirstName = cursor.getString(2); 
       String mLastName = cursor.getString(3); 
       String mPhoneMobile = cursor.getString(4); 
       String mPhoneOffice = cursor.getString(5); 
       String mCostCenter = cursor.getString(10); 
       String mHasDirectReports = cursor.getString(7); 
       String mTitle = cursor.getString(6); 
       String mPic = cursor.getString(9); 
       Intent mIntent = new Intent(context, EmployeeFullInfo.class); 
       mIntent.putExtra("Employee_number", mEmployeeNumber); 
       mIntent.putExtra("Email", mEmail); 
       mIntent.putExtra("First_name", mFirstName); 
       mIntent.putExtra("Last_name", mLastName); 
       mIntent.putExtra("Phone_mobile", mPhoneMobile); 
       mIntent.putExtra("Phone_office", mPhoneOffice); 
       mIntent.putExtra("Cost_center_id", mCostCenter); 
       mIntent.putExtra("Has_direct_reports", mHasDirectReports); 
       mIntent.putExtra("Payroll_title", mTitle); 
       mIntent.putExtra("ThumbnailData", mPic); 
       mIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); 
       v.getContext().startActivity(mIntent); 
      } 
     }); 
    } 

    public static class ViewHolder { 
     TextView tvFirstName; 
     TextView tvLastName; 
     TextView tvTitle; 
     ImageView mPeepPic; 
     ImageButton mDetailsButton; 
     CardView mCardView; 
    } 
} 

Answer 1

如果我理解正確的話，你想擁有的代碼知道當一個click事件在一個適配器發生，然後發送一些數據到另一個。

在這種情況下，您可以簡單地定義一個接口，通過包含兩者的Activity類來橋接適配器之間的「通信」。

例如，這裏是您的接口定義的接口。當你點擊按鈕時它會被激活。

public class TopListCursorAdapter extends CursorAdapter { 

    public interface TopListClickListener { 
     void onTopListClick(int position); // Can add more parameters here 
    } 

    private TopListClickListener callback; 

    public TopListCursorAdapter(Context context, Cursor cursor) { 
     super(context, cursor, 0); 
     if (!(context instanceof TopListClickListener)) { 
      throw new ClassCastException("Context must implement TopListClickListener"); 
     } 
     this.callback = (TopListClickListener) context; 
    } 

    ... 

     holder.mDetailsButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       cursor.moveToPosition(position); 
       ... 
       if (callback != null) { 
        callback.onTopListClick(position); // Can pass more parameters here 
       } 

而在活動中，您可以實現該接口（又名回調）

public class MainActivity extends AppCompatActivity 
    implements TopListCursorAdapter.TopListClickListener // see here 

    // private ... topAdapter, bottomAdapter; 

    @Override 
    public void onTopListClick(int position) { 
     // Make sure parameters match the interface ^^^ 


     // TODO: Get data from topAdapter 
     // TODO: database update or arraylist.add to change bottomAdapter 
     bottomAdapter.notifyDataSetChanged(); // Update the UI 
    } 

    // Other code can remain the same