Question

我得到了答案：accessing buttons of every layout 关于如何显示特定布局的所有按钮，但我不理解代码这是我试图让它运行的方式项目的其余部分与上面的链接非常相似这是我改变的：

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

这个怎么样？唯一的问题是，您需要一个布局（/res/layout/listactivity.xml），其列表视图的ID为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));
        }
    }
}

访问特定布局的按钮

1 个答案: