Android :: findViewByID - 如何通過另一個UI元素的監聽器獲取TextView的視圖？

Question

這將是一個有點蹩腳的問題。 我有以下代碼：

..............
 public void onCreate (Bundle bundle)
 {
  super.onCreate(bundle);
  this.setContentView(R.layout.main2);
  Button bnt = (Button) this.findViewById(R.id.browser);
  bnt.setOnClickListener(new ButtonListener());

 }
..............
class ButtonListener implements android.view.View.OnClickListener
{

 public void onClick(View v) 
 {
  // I have a TextView in my xml layout file. 
  // I'd like to get it and change my text when I click this button.
  // But I can't get it (the TextView) unless I make it as a value of a static member of this class and pass it to the constructor. 
  //I believe I am missing a big point here, so i'd be very thankful if you could explain how this is meant to be done ? 

 }
}

任何幫助表示贊賞。

Answer 1

你可以試試這個：

class ButtonListener implements android.view.View.OnClickListener {
    public void onClick(View v) {
        View parent = (View)v.getParent();
        if (parent != null) {
            TextView txtView = parent.findViewById(R.id.mytextview);
            txtView.setText(...);
        }
    }
}

用法取決於您的布局。 可能的話，您的按鈕的父級不是您的textview的父級，所以要小心......

Answer 2

class ButtonListener implements android.view.View.OnClickListener {
    public void onClick(View v) {
       View p = (View) view.getRootView();        
        if (p != null) {
            TextView txtView = (TextView) p.findViewById(R.id.mytextview);
            txtView.setText(...);
        }
    }
}

我需要設置一個來自同一個父元素的元素，所以我使用了這個代碼:)並且它有效

Answer 3

編輯我不認為這是可能的。 視圖V中只有按鈕視圖....

你會知道你是否相同

  class ButtonListener implements android.view.View.OnClickListener
    {

     public void onClick(View v) 
     {

        Button vg=(Button)v;
        Log.e("", "views are "+vg.getText());

//但是你可以在這里為ue textview txt.setText設置測試（“改變文本”）;

     }
    }

---

我沒有正確理解你的問題。 但是，如果你只想從你的TextView中獲取文本，你可以嘗試這樣

TextView txt;

public void onCreate (Bundle bundle)
 {
  super.onCreate(bundle);
  this.setContentView(R.layout.main2);
  Button bnt = (Button) this.findViewById(R.id.browser);
  txt=(TextView)this.findViewById(R.id.urtextview);
  bnt.setOnClickListener(new ButtonListener());

 }
..............
class ButtonListener implements android.view.View.OnClickListener
{

 public void onClick(View v) 
 {
  // I have a TextView in my xml layout file. 
  // I'd like to get it and change my text when I click this button.
  // But I can't get it (the TextView) unless I make it as a value of a static member of this class and pass it to the constructor. 
  //I believe I am missing a big point here, so i'd be very thankful if you could explain how this is meant to be done ? 
//I think this should get u the string...
System.out.println("text is "+txt.getText().toString());

 }
}