如何從alignParentLeft切換到alignParentRIght？

Question

我希望我的聊天氣泡可以在不同用戶發送消息時移動到右側，但由於某種原因它仍停留在同一側。這是我試過的：

RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) holder.bubble.getLayoutParams(); 
if (message.getPersonId() == MainActivity.getUser().getUserId()) { 
     params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, 0); 
     params.addRule(RelativeLayout.ALIGN_PARENT_LEFT, RelativeLayout.TRUE); 
} else { 
     params.addRule(RelativeLayout.ALIGN_PARENT_LEFT, 0); 
     params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT, RelativeLayout.TRUE); 
} 
holder.bubble.setLayoutParams(params); 

有什麼我做錯了嗎？我也嘗試過params.removeRule(int)，但它不起作用，另外我更喜歡遠離這一點，因爲我希望儘可能確保操作系統的可用性。

Answer 1

您可以簡單地添加參數，這樣way-

RelativeLayout.LayoutParams rlp = new RelativeLayout.LayoutParams 
(
     RelativeLayout.LayoutParams.MATCH_PARENT, 
     RelativeLayout.LayoutParams.MATCH_PARENT 
); 

------------------------------------ 
---------------------------------- 
// Creating a new TextView 
TextView tv = new TextView(this); 
tv.setText(d.getName()); 
tv.setTextSize(25); 

// Defining the layout parameters of the TextView 
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
     RelativeLayout.LayoutParams.WRAP_CONTENT, 
     RelativeLayout.LayoutParams.WRAP_CONTENT); 
     lp.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); 

// Setting the parameters on the TextView 
tv.setLayoutParams(lp); 
b.setLayoutParams(lp); 

// Adding the TextView to the RelativeLayout as a child 

我認爲，如果按照這種方式，不會有任何問題。

Answer 2

看來你沒有正確使用adRule()。請更改，然後再試一次：

RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) holder.bubble.getLayoutParams(); 
if (message.getPersonId() == MainActivity.getUser().getUserId()) { 
    params.removeRule(RelativeLayout.ALIGN_PARENT_RIGHT); 
    params.addRule(RelativeLayout.ALIGN_PARENT_LEFT); 
} 
else { 
    params.removeRule(RelativeLayout.ALIGN_PARENT_LEFT); 
    params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT); 
} 
holder.bubble.setLayoutParams(params);