當我改變線性佈局的可見性，並添加到列表中所有過去的項目的可見性將被改變

Question

我有一個模擬聊天的Android程序。因爲它我使用列表和項目的名單是在XML文件名爲activity_chat_conversation在這種佈局我必須線性佈局，其中每個我有EditText和ImageView。

代碼：

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:tools="http://schemas.android.com/tools" 
android:id="@+id/llmain" 
android:layout_width="match_parent" 
android:layout_height="match_parent" 
android:orientation="vertical" 
tools:ignore="UseCompoundDrawables" > 

<LinearLayout 
    android:id="@+id/llFrom" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:paddingTop="7dp" 
    android:visibility="gone" > 

    <ImageView 
     android:id="@+id/imgChatConversationFrom" 
     android:layout_width="32dp" 
     android:layout_height="32dp" 
     android:background="@color/gray" 
     android:contentDescription="@string/user_image" 
     android:scaleType="fitCenter" 
     android:src="@drawable/ic_user_image" /> 

    <TextView 
     android:id="@+id/txtChatConversationFrom" 
     android:layout_width="0dp" 
     android:layout_height="45dp" 
     android:layout_weight="1" 
     android:background="@drawable/from" 
     android:gravity="right|top" 
     android:layoutDirection="rtl" 
     android:paddingLeft="45dp" 
     android:paddingRight="10dp" 
     android:text="@string/user_name" 
     android:textAppearance="?android:attr/textAppearanceSmall" 
     android:textDirection="rtl" /> 

</LinearLayout> 

<LinearLayout 
    android:id="@+id/llTo" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:paddingTop="7dp" 
    android:visibility="gone" > 

    <TextView 
     android:id="@+id/txtChatConversationTo" 
     android:layout_width="0dp" 
     android:layout_height="45dp" 
     android:layout_weight="1" 
     android:background="@drawable/to" 
     android:gravity="right|top" 
     android:layoutDirection="rtl" 
     android:paddingRight="48dp" 
     android:paddingTop="5dp" 
     android:text="@string/user_name" 
     android:textAppearance="?android:attr/textAppearanceSmall" 
     android:textDirection="rtl" /> 

    <ImageView 
     android:id="@+id/imgChatConversationTo" 
     android:layout_width="32dp" 
     android:layout_height="32dp" 
     android:layout_gravity="bottom" 
     android:background="@color/gray" 
     android:contentDescription="@string/user_image" 
     android:scaleType="fitCenter" 
     android:src="@drawable/ic_user_image" /> 

</LinearLayout> 

填充列表我創建一個適配器，並在其中我設置要顯示什麼樣的線性佈局。

代碼：

globalVars.barConversation = new BaseAdapter() { 
          int searchUser = globalVars.findConversationByUsername(friendId); 

          @Override 
          public View getView(int position, View convertView, ViewGroup parent) { 
           View view = convertView; 
           if(convertView == null) { 
            view = getLayoutInflater().inflate(R.layout.activity_chat_conversation, null); 
           } 
           LinearLayout llfrom = (LinearLayout)view.findViewById(R.id.llFrom); 
           LinearLayout llto = (LinearLayout)view.findViewById(R.id.llTo); 
           TextView textViewTo = (TextView)view.findViewById(R.id.txtChatConversationTo); 
           ImageView imageViewTo = (ImageView)view.findViewById(R.id.imgChatConversationTo); 
           TextView textViewFrom = (TextView)view.findViewById(R.id.txtChatConversationFrom); 
           ImageView imageViewFrom = (ImageView)view.findViewById(R.id.imgChatConversationFrom); 

           String pmUser = friendId; 

           if (searchUser > -1) { 
            if (globalVars.conversations.get(searchUser). 
              getConversation().get(position).getSender()) { 
             pmUser = CurrentUser; 
             if (globalVars.userImage != null) { 
              imageViewTo.setImageBitmap(globalVars.userImage); 
             } 
            }else { 
             try{ 
              if(globalVars.friends.get(friendInt).getImage() != null) { 
               imageViewFrom.setImageBitmap(globalVars.friends.get(friendInt).getImage()); 
              } 
             } 
             catch(Exception ex) 
             { 
              Log.e("Chat get friend picture", ex.toString()); 
             } 
            } 
            if (!globalVars.conversations.get(searchUser). 
              getConversation().get(position).getIsRead()) { 
             globalVars.conversations.get(searchUser). 
             getConversation().get(position).setIsRead(true); 
             globalVars.newConversations--; 
            } 
            if(pmUser == CurrentUser) 
            { 
             llto.setVisibility(0); 
             llfrom.setVisibility(8); 
             textViewFrom.setVisibility(8); 
             imageViewFrom.setVisibility(8); 
             textViewTo.setText(globalVars.conversations.get(searchUser). 
              getConversation().get(position).getText()); 
             textViewTo.setHeight(30); 
            } 
            else 
            { 
             llfrom.setVisibility(0); 
             llto.setVisibility(8); 
             textViewTo.setVisibility(8); 
             imageViewTo.setVisibility(8); 
             textViewFrom.setText(globalVars.conversations.get(searchUser). 
               getConversation().get(position).getText()); 
            } 
           } 
           return view; 
          } 

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

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

          @Override 
          public int getCount() { 
           if (searchUser > -1) { 
            return globalVars.conversations.get(searchUser).getConversation().size(); 
           } 
           return 0; 
          } 
         }; 

當我添加新項列出，並設置可見它以前的項目可見性將被改變。

我該如何解決這個問題？

Answer 1

這是因爲convertView ==以前的getView()方法。您需要刷新您的新項目的參數。例如：

if(pmUser == CurrentUser) 
{ 
    llto.setVisibility(0); 
    textViewTo.setVisibility(0); 
    imageViewTo.setVisibility(0); //this 
    llfrom.setVisibility(8); 
    textViewFrom.setVisibility(8); 
    imageViewFrom.setVisibility(8); 
    textViewTo.setText(globalVars.conversations.get(searchUser). 
      getConversation().get(position).getText()); 
    textViewTo.setHeight(30); 
} 
else 
{ 
    llfrom.setVisibility(0); 
    textViewFrom.setVisibility(0); 
    imageViewFrom.setVisibility(0); // this 
    llto.setVisibility(8); 
    textViewTo.setVisibility(8); 
    imageViewTo.setVisibility(8); 
    textViewFrom.setText(globalVars.conversations.get(searchUser). 
      getConversation().get(position).getText()); 
}