如何訪問佈局視圖？

Question

我有我創建了一個XML配置文件：

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

    <EditText 
     android:id="@+id/editText_dateStart" 
     android:textColor="@color/colorPrimaryDark" 
     android:textColorHint="@color/colorPrimary" 
     android:layout_marginLeft="15dp" 
     android:layout_marginRight="15dp" 
     android:padding="20dp" 
     android:hint="Start Date" 
     android:inputType="date" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" /> 

    <EditText 
     android:id="@+id/editText_dateEnd" 
     android:textColor="@color/colorPrimaryDark" 
     android:textColorHint="@color/colorPrimary" 
     android:layout_marginLeft="15dp" 
     android:layout_marginRight="15dp" 
     android:padding="20dp" 
     android:hint="End Date" 
     android:inputType="date" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" /> 

    <Button 
     android:id="@+id/button_ok" 
     android:layout_marginLeft="15dp" 
     android:layout_marginRight="15dp" 
     android:layout_marginBottom="15dp" 
     android:text="Ok" 
     android:textColor="#ffffffff" 
     android:background="@color/colorPrimaryDark" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" /> 

</LinearLayout> 

我要訪問的佈局，並在一個類中的方法，我寫返回佈局的觀點：

public class Utility { 
// 6 - LayoutInflate tool start 
    public static View getViewOfLayout(Activity activity, int layoutId, int viewId) { 
     LayoutInflater lin = activity.getLayoutInflater(); 
     View view = lin.inflate(layoutId, null); 
     view = view.findViewById(viewId); 
     return view; 
    } 
    // LayoutInflate tool end 
} 

我也希望能夠訪問Activity類的觀點：

Button button = (Button) Utility.getViewOfLayout(this, R.layout.datedialogbox, R.id.button_ok); 
      button.setText("a"); 

當我運行上面的代碼，什麼都沒有發生：文並沒有「一」預期從「OK」改變。

Answer 1

更新：

1. 更新你Utility.java類，如下：

   public class Utility { 
   
       public static View getViewOfLayout(View layout, int viewId) { 
   
        View view = layout.findViewById(viewId); 
        return view; 
       } 
   } 
   

2. 在你Activity類：

   .............. 
   .................... 
   LayoutInflater inflater = activity.getLayoutInflater(); 
   View dialogLayout = inflater.inflate(R.layout.datedialogbox, null); 
   
   Button button = (Button) Utility.getViewOfLayout(dialogLayout, R.id.button_ok); 
   
   button.setText("BUTTON"); 
   button.setOnClickListener(new View.OnClickListener() { 
        @Override 
        public void onClick(View view) { 
         // Do something... 
        } 
       }); 
   
   
   ...................... 
   ............................. 
   

如果你的目的是爲了創造一個Custom Dialog那麼你可以用最少的代碼如下容易做到這一點：

  AlertDialog.Builder dialogBuilder; 
      AlertDialog dialog; 

      LayoutInflater inflater = activity.getLayoutInflater(); 
      View dialogLayout = inflater.inflate(R.layout.datedialogbox, null); 

      // Views 
      final EditText editTextDateStart = (EditText) dialogLayout.findViewById(R.id.editText_dateStart); 
      final EditText editTextDateEnd = (EditText) dialogLayout.findViewById(R.id.editText_dateEnd); 
      Button button = (Button) dialogLayout.findViewById(R.id.button_ok); 

      button.setText("BUTTON"); // Change button text 
      button.setOnClickListener(new View.OnClickListener() { 
       @Override 
       public void onClick(View view) { 

        String dateStart = editTextDateStart.getText().toString(); 
        String dateEnd = editTextDateEnd.getText().toString(); 

        // Do something 
       } 
      }); 

      dialogBuilder = new AlertDialog.Builder(activity); 
      dialogBuilder.setView(dialogLayout); 

      dialog = dialogBuilder.create(); 
      dialog.show();