Recyclerview滾動使項目更新

當我滾動回收視圖，然後向後滾動項目互換，數據被交換。我有單獨的子項目列表，沒有特定的大小。多數情況下，當我向後滾動時，子項目有重複和/或子項目交換。我已經嘗試將代碼的動態部分移至oncreateviewholder，但這沒有任何區別。Recyclerview滾動使項目更新

private LinkedHashMap<String, ArrayList<String>> messages; 
private Context mContext; 
int k =0; 

public static class ViewHolder extends RecyclerView.ViewHolder { 
    // each data item is just a string in this case 
    public TextView mSmsSender; 
    public LinearLayout smsContainer; 


    public ViewHolder(View v) { 
     super(v); 
     mSmsSender = (TextView)v.findViewById(R.id.smsSender); 
     smsContainer = (LinearLayout) v.findViewById(R.id.smsContainer); 
    } 
} 

public SmsAdapter(LinkedHashMap<String, ArrayList<String>> messages, Context context){ 
    this.messages = messages; 
    mContext = context; 
} 

@Override 
public SmsAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    // create a new view 
    View v = LayoutInflater.from(parent.getContext()) 
      .inflate(R.layout.sms_message, parent, false); 
    // set the view's size, margins, paddings and layout parameters 
    ViewHolder vh = new ViewHolder(v); 
    final String smsSender = (new ArrayList<String>(messages.keySet())).get(k); 
    k++; 
    ArrayList<String> sms = messages.get(smsSender); 

    for(int i =0;i<sms.size();i++){ 
     TextView vt = new TextView(mContext); 
     RelativeLayout.LayoutParams lp = new RelativeLayout. 
       LayoutParams(LinearLayoutCompat.LayoutParams.WRAP_CONTENT, 
       LinearLayoutCompat.LayoutParams.WRAP_CONTENT); 

     vt.setLayoutParams(lp); 
     vt.setPadding(3,3,3,3); 
     vt.setText(sms.get(i)); 
     vh.smsContainer.addView(vt); 
    } 
    return vh; 
} 

@Override 
public void onBindViewHolder(SmsAdapter.ViewHolder holder, int position) { 

     final String smsSender = (new ArrayList<String>(messages.keySet())).get(position); 
     holder.mSmsSender.setText(smsSender); 

} 

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

}

來源

2016-08-04 Navneet M Kumar

在onBindViewHolder，每次您要創建一個列表，你應該創建它一次，然後就打電話聯繫上 – lelloman

與@lelloman，新的ArrayList 同意（messages.keySet（））應該放在構造函數 – anhtuannd

中但是仍然存在相同的問題。 –

這是因爲ü沒有約束力的新觀點。在每個動態調用中創建一個新的。請在onBindViewHolder中執行你的操作。至於onCreateViewHolder，請保持乾淨並且只能膨脹視圖。

來源

2016-08-04 10:47:31 AbiDoll

我曾嘗試在onBindViewHolder中也做同樣的事情，但也有同樣的問題。 –

-1

試試這個：

private LinkedHashMap<String, ArrayList<String>> messages; 
private Context mContext; 


public static class ViewHolder extends RecyclerView.ViewHolder { 
    // each data item is just a string in this case 
    public TextView mSmsSender; 
    public LinearLayout smsContainer; 

    public ViewHolder(View v) { 
     super(v); 
     mSmsSender = (TextView)v.findViewById(R.id.smsSender); 
     smsContainer = (LinearLayout) v.findViewById(R.id.smsContainer); 
    } 
} 

public SmsAdapter(LinkedHashMap<String, ArrayList<String>> messages, Context context){ 
    this.messages = messages; 
    mContext = context; 
} 

@Override 
public SmsAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    // create a new view 
    View v = LayoutInflater.from(parent.getContext()) 
      .inflate(R.layout.sms_message, parent, false); 
    // set the view's size, margins, paddings and layout parameters 
    ViewHolder vh = new ViewHolder(v); 

    return vh; 
} 

@Override 
public void onBindViewHolder(SmsAdapter.ViewHolder holder, int position) { 

     final String smsSender = (new ArrayList<String>(messages.keySet())).get(position); 
     holder.mSmsSender.setText(smsSender); 



    ArrayList<String> sms = messages.get(smsSender); 

    for(int i =0;i<sms.size();i++){ 
     TextView vt = new TextView(mContext); 
     RelativeLayout.LayoutParams lp = new RelativeLayout. 
       LayoutParams(LinearLayoutCompat.LayoutParams.WRAP_CONTENT, 
       LinearLayoutCompat.LayoutParams.WRAP_CONTENT); 

     vt.setLayoutParams(lp); 
     vt.setPadding(3,3,3,3); 
     vt.setText(sms.get(i)); 
     vh.smsContainer.addView(vt); 
    } 

} 

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

來源

2016-08-04 10:47:33

我沒有看到沒有解釋的負面投票。不要拒絕投票。 –

Recyclerview滾動使項目更新

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