訪問特定佈局的按鈕

Question

我有一個答案：accessing buttons of every layout 如何顯示特定佈局的所有的按鈕，但我不明白的代碼 這裏是我如何努力，使其運行 的該項目的其餘部分是excatly同上 這裏的鏈接是我變了：

package com.example.adapterlist; 
import java.util.ArrayList; 
import java.util.HashMap; 
import java.util.Map; 

import android.os.Bundle; 
import android.app.Activity; 
import android.util.Log; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.ListView; 

public class MainActivity extends Activity { 
    Map<String, Integer> layoutIds = new HashMap<String, Integer>(); 
    ArrayList<String> arrayForArrayAdapter; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
     final ListView listView = (ListView) findViewById(R.id.mylist); 
     java.lang.reflect.Field[] ID_Fields = R.layout.class.getFields(); 
     String []values=new String[ID_Fields.length]; 
     int[] resArray = new int[ID_Fields.length]; 
     for(int i = 0; i < ID_Fields.length; i++){ 
      try { 
       resArray[i] = ID_Fields[i].getInt(null); 
       values[i]=getResources().getResourceEntryName(resArray[i]); 
       Log.v("resArray[i] " , getResources().getResourceEntryName(resArray[i])); 

      } catch (IllegalArgumentException e) { 
       e.printStackTrace(); 
      } catch (IllegalAccessException e) { 
       e.printStackTrace(); 
      } 
     } 
    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, 
      android.R.layout.simple_list_item_1, android.R.id.text1, values); 
      listView.setAdapter(adapter); 
      listView.setOnItemClickListener(new OnItemClickListener(){ 
      @Override 
      public void onItemClick(AdapterView<?> arg0, View arg1, 
         int arg2, long arg3) { 
        iJustClickedAnItemInTheList((String) listView.getSelectedItem()); 



       } 
      }); 


    } 

    private void iJustClickedAnItemInTheList(String idname) { 
     setContentView(layoutIds.get(idname)); 
     ArrayList<Button> allButtonsInLayout = getViewsFromViewGroup(findViewById(android.R.id.content), Button.class); 
    } 

    public static <T> ArrayList<T> getViewsFromViewGroup(View root, Class<T> clazz) { 
     ArrayList<T> result = new ArrayList<T>(); 
     for (View view : getAllViewsFromRoots(root)) 
      if (clazz.isInstance(view)) 
       result.add(clazz.cast(view)); 
     return result; 
    } 

    public static ArrayList<View> getAllViewsFromRoots(View...roots) { 
     ArrayList<View> result = new ArrayList<View>(); 
     for (View root : roots) 
      getAllViews(result, root); 
     return result; 
    } 

    private static void getAllViews(ArrayList<View> allviews, View parent) { 
     allviews.add(parent); 
     if (parent instanceof ViewGroup) { 
      ViewGroup viewGroup = (ViewGroup)parent; 
      for (int i = 0; i < viewGroup.getChildCount(); i++) 
       getAllViews(allviews, viewGroup.getChildAt(i)); 
     } 
     } 


    } 

Answer 1

這個怎麼樣？唯一的問題是，您需要一個佈局（/res/layout/listactivity.xml），其中列表視圖的編號爲listView。

public class MainActivity extends Activity { 
    ListView lv; 
    String[] layoutNames; 
    int[] layoutIds; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.listactivity); 
     lv = (ListView)findViewById(R.id.listView); 
    } 

    @Override 
    protected void onResume() { 
     super.onResume(); 
     fill(); 
     ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, layoutNames); 
     lv.setAdapter(adapter); 
     lv.setOnItemClickListener(new OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) { 
       iJustClickedAnItemInTheList(arg2); 
      } 
     }); 
    } 

    void fill() { 
     java.lang.reflect.Field[] layoutFields = R.layout.class.getFields(); 
     layoutNames = new String[layoutFields.length]; 
     layoutIds = new int[layoutFields.length]; 
     for(int i = 0; i < layoutFields.length; i++){ 
      try { 
       layoutIds[i] = layoutFields[i].getInt(null); 
       layoutNames[i] = getResources().getResourceEntryName(layoutIds[i]); 
      } catch (IllegalArgumentException e) { 
       e.printStackTrace(); 
      } catch (IllegalAccessException e) { 
       e.printStackTrace(); 
      } 
     } 
    } 

    private void iJustClickedAnItemInTheList(int position) { 
     setContentView(layoutIds[position]); 
     ArrayList<Button> allButtonsInLayout = getViewsFromViewGroup(findViewById(android.R.id.content), Button.class); 
     Toast.makeText(this, "" + allButtonsInLayout.size(), Toast.LENGTH_SHORT).show(); 
    } 

    public static <T> ArrayList<T> getViewsFromViewGroup(View root, Class<T> clazz) { 
     ArrayList<T> result = new ArrayList<T>(); 
     for (View view : getAllViewsFromRoots(root)) 
      if (clazz.isInstance(view)) 
       result.add(clazz.cast(view)); 
     return result; 
    } 

    public static ArrayList<View> getAllViewsFromRoots(View...roots) { 
     ArrayList<View> result = new ArrayList<View>(); 
     for (View root : roots) 
      getAllViews(result, root); 
     return result; 
    } 

    private static void getAllViews(ArrayList<View> allviews, View parent) { 
     allviews.add(parent); 
     if (parent instanceof ViewGroup) { 
      ViewGroup viewGroup = (ViewGroup)parent; 
      for (int i = 0; i < viewGroup.getChildCount(); i++) 
       getAllViews(allviews, viewGroup.getChildAt(i)); 
     } 
    } 
}