访问查看从另一个布局 [英] Access View from Another Layout

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问题描述

我使用自定义列表项(包括按钮)一个ListView。我有一个自定义适配器,我在其中设置按钮的OnClickListener到一个内部类(在适配器类中定义)。

我要访问该类中显示列表视图(从ListAcitivty类的在不同的XML文件中定义)按钮。我想设置它的这个类中的方法onClickListener。什么是去这样做的最佳方式?

编辑:
   这是我的list_item.xml(我用我的ListView行)。

 < LinearLayout中的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    机器人:layout_width =FILL_PARENT
    机器人:layout_height =WRAP_CONTENT>
< ImageView的
    机器人:ID =@ + ID / ImageView的
    机器人:layout_width =22dp
    机器人:layout_height =WRAP_CONTENT
    机器人:layout_marginLeft =4DP
    机器人:layout_marginRight =10dp
    机器人:layout_marginTop =4DP
    机器人:contentDescription =颜色
    机器人:SRC =@绘制/ ic_launcher>
< / ImageView的><的EditText
    机器人:ID =@ + ID / nameEdit
    机器人:layout_width =250dp
    机器人:layout_height =WRAP_CONTENT
    机器人:TEXTSIZE =20dp
    安卓的inputType =textPersonName
    >
< /&的EditText GT;
<按钮
    机器人:ID =@ + ID / deleleButton
    机器人:layout_width =WRAP_CONTENT
    机器人:layout_height =match_parent
    机器人:背景=@绘制/ delete_button>< /按钮>< / LinearLayout中>

我如何访问按钮:我的类扩展ListActivity内(ID deleteButton)?扩展listactivity类有一个单独的布局(main.xml中假设)。如果我做的setContentView(主)扩展listactivity类里面,findViewById(R.id.deleteButton)将返回null。

编辑2:
这是我的类扩展ListActivity。如果我把findViewById(R.id.deleteButton)中的setContentView后返回null。

 公共类PlayerSelection扩展ListActivity {
    ListView控件列表;
    ArrayList的< PlayerField> textviews = NULL;
    PlayerFieldsAdapter适配器= NULL;    @覆盖
    保护无效的onCreate(捆绑savedInstanceState){
        super.onCreate(savedInstanceState);
        的setContentView(R.layout.player_selection_page);
        清单= getListView();        textviews =新的ArrayList< PlayerField>();
        的for(int i = 0; I< GlobalVariables.getPlayers();我++){
            textviews.add(ⅰ,新PlayerField());
        }
        适配器=新PlayerFieldsAdapter(这一点,R.layout.list_item,textviews);    ViewGroup中头=(ViewGroup中)getLayoutInflater()膨胀(R.layout.list_header,NULL);
    键返回按钮= NULL;
    的for(int i = 0; I< header.getChildCount();我++){
        视图V = header.getChildAt(I)
        如果(V的instanceof按钮){
            后退按钮=(按钮)V;
            打破;
        }
    }
    backButton.setOnClickListener(新OnClickListener(){
            公共无效的onClick(视图v){
                意图optionsIntent =新意图(PlayerSelection.this,OptionsScreen.class);
                startActivity(optionsIntent);
            }
        });
    list.addHeaderView(头);
        list.setAdapter(适配器);
    }


解决方案

简单的方法来实现这一目标是创建 CustomAdapter 类中的字段:

 私人OnClickListener监听器;

然后指定此字段的setter方法​​。下一步将是指定活动的内部监听器类这样的:

  CustomAdapter适配器=(CustomAdapter)getListView()getAdapter()。
adapter.setListener(小于你的听者GT的实施;);

那么你的 CustomAdapter getView()方法内你这个监听器设置为您的按钮:

 按钮BTN =(按钮)convertView.findViewById(R.id.btn);
btn.setOnClickListener(监听);

希望这有助于。

I'm using a ListView with custom list items (including a button). I have a custom adapter, in which I set the button's OnClickListener to an inner class (defined in the adapter class).

I want to access the button in the class (defined in a different xml file from the ListAcitivty class's) in which the listview is displayed. I want to set it's onClickListener method inside this class. What's the best way to go about doing this?

Edit: This is my list_item.xml (I use for my ListView rows).

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >


<ImageView
    android:id="@+id/imageView"
    android:layout_width="22dp"
    android:layout_height="wrap_content"
    android:layout_marginLeft="4dp"
    android:layout_marginRight="10dp"
    android:layout_marginTop="4dp"
    android:contentDescription="Color"
    android:src="@drawable/ic_launcher" >
</ImageView>

<EditText
    android:id="@+id/nameEdit"
    android:layout_width="250dp"
    android:layout_height="wrap_content"
    android:textSize="20dp" 
    android:inputType="textPersonName"
    >
</EditText>


<Button
    android:id="@+id/deleleButton"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:background="@drawable/delete_button" >

</Button>

</LinearLayout>

How do I access the button (id:deleteButton) inside my class that extends ListActivity? The class that extends listactivity has a separate layout (main.xml let's say). If I do setContentView(main) inside the class that extends listactivity, findViewById(R.id.deleteButton) would return null.

Edit 2: This is my class that extends ListActivity. If I place findViewById(R.id.deleteButton) after the setContentView it returns null.

public class PlayerSelection extends ListActivity {
    ListView list;
    ArrayList<PlayerField> textviews = null;
    PlayerFieldsAdapter adapter = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.player_selection_page);
        list = getListView();

        textviews = new ArrayList<PlayerField>();
        for (int i = 0; i< GlobalVariables.getPlayers(); i++) {
            textviews.add(i, new PlayerField());
        }
        adapter = new PlayerFieldsAdapter(this, R.layout.list_item, textviews); 

    ViewGroup header = (ViewGroup) getLayoutInflater().inflate(R.layout.list_header, null);
    Button backButton = null;
    for (int i = 0; i < header.getChildCount(); i++) {
        View v = header.getChildAt(i);
        if (v instanceof Button) {
            backButton = (Button) v;
            break;
        }
    }
    backButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                Intent optionsIntent = new Intent(PlayerSelection.this, OptionsScreen.class);
                startActivity(optionsIntent);
            }
        });
    list.addHeaderView(header);
        list.setAdapter(adapter);
    }

解决方案

Easy way to achieve this is to create a field inside your CustomAdapter class:

private OnClickListener listener;

Then specify a setter method for this field. Next step will be to specify this listener inside your Activity class like that:

CustomAdapter adapter = (CustomAdapter) getListView().getAdapter();
adapter.setListener(<your implementation of the listener>);

Then inside your CustomAdapter's getView() method you set this listener to your button:

Button btn = (Button) convertView.findViewById(R.id.btn);
btn.setOnClickListener(listener);

Hope this helps.

这篇关于访问查看从另一个布局的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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