" ArrayAdapter需要的资源ID是一个TextView" XML问题是一个、问题、资源、ArrayAdapter

2023-09-11 10:59:48 作者:ㄡㄡ眼藏光de鹿ら☆

我想设置我的视图来显示的ListView 因为我想显示(文本文件)的文件时,得到一个错误。我是pretty的确保它有什么做的XML。我只是想显示从 this.file = fileop.ReadFileAsList(Installed_pa​​ckages.txt)中的信息; 。我的code:

 公共类主要扩展活动{
    私人TextView的电视;
    私人FileOperations fileop;
    私有String []文件;

    / **第一次创建活动时调用。 * /
    @覆盖
    公共无效的onCreate(包savedInstanceState){
        super.onCreate(savedInstanceState);
        this.fileop =新FileOperations();
        this.file = fileop.ReadFileAsList(Installed_pa​​ckages.txt);
        的setContentView(R.layout.main);
        电视=(TextView中)findViewById(R.id.TextView01);
        ListView的LV =新的ListView(本);
        lv.setTextFilterEnabled(真正的);
        lv.setAdapter(新ArrayAdapter<字符串>(这一点,R.layout.list_item,this.file));
        lv.setOnItemClickListener(新AdapterView.OnItemClickListener(){

              公共无效onItemClick(适配器视图<>母公司视图中查看,INT位置,长的id){
                    //单击时,显示出与TextView的文字敬酒
                    Toast.makeText(getApplicationContext(),((TextView的)视图).getText(),Toast.LENGTH_SHORT).show();
              }
        });
        的setContentView(LV);
    }

}
 

list_item.xml

 < XML版本=1.0编码=UTF-8&GT?;
< 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 =FILL_PARENT
    机器人:方向=垂直
    机器人:填充=10dp
    机器人:TEXTSIZE =16SP
    机器人:文字颜色=#000>

< / LinearLayout中>
 

的main.xml

 < XML版本=1.0编码=UTF-8&GT?;
< LinearLayout中的xmlns:机器人=htt​​p://schemas.android.com/apk/res/android
    机器人:方向=垂直
    机器人:layout_width =FILL_PARENT
    机器人:layout_height =FILL_PARENT
    机器人:weightSum =1>
<滚动型
    机器人:ID =@ + ID / SCROLLER_ID
    机器人:layout_width =FILL_PARENT
    机器人:layout_height =WRAP_CONTENT
    机器人:滚动条=垂直
    机器人:fillViewport =真正的>
        <的TextView
        机器人:layout_width =FILL_PARENT
        机器人:layout_height =WRAP_CONTENT
        机器人:填充=5SP
        机器人:ID =@ + ID / TextView01
        机器人:文本=@字符串/你好/>
    < /滚动型>

< / LinearLayout中>
 
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解决方案

在 ArrayAdapter需要的资源ID是一个TextView XML 的异常意味着你不提供什么 ArrayAdapter 预期。当您使用此构造函数:

 新ArrayAdapter<字符串>(这一点,R.layout.a_layout_file,this.file)
 

R.Layout.a_layout_file 必须包含一个XML布局文件的ID只有的TextView (即的TextView 不能按另一个布局包裹,就像一个的LinearLayout RelativeLayout的等),这样的事情:

 < XML版本=1.0编码=UTF-8&GT?;
< TextView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
    //其他TextView的属性
/>
 

如果你想让你的列表行布局是东西有点不同,那么一个简单的的TextView 小工具使用此构造函数:

 新ArrayAdapter<字符串>(这一点,R.layout.a_layout_file,
   R.id.the_id_of_a_textview_from_the_layout,this.file)
 

在您提供的 ID ,可以包含各种意见的布局,也必须包含的TextView 与和 ID (第三个参数),你传递给你的 ArrayAdapter 所以它可以知道放在哪里字符串的行布局。

I am getting an error when trying to set my view to display the ListView for the file I want to display(text file). I am pretty sure it has something to do with the xml. I just want to display the information from this.file = fileop.ReadFileAsList("Installed_packages.txt");. My code:

public class Main extends Activity {
    private TextView tv;
    private FileOperations fileop;
    private String[] file;

    /** Called when the activity is first created. */       
    @Override
    public void onCreate(Bundle savedInstanceState) {           
        super.onCreate(savedInstanceState); 
        this.fileop = new FileOperations(); 
        this.file = fileop.ReadFileAsList("Installed_packages.txt"); 
        setContentView(R.layout.main);
        tv = (TextView) findViewById(R.id.TextView01);
        ListView lv = new ListView(this);
        lv.setTextFilterEnabled(true); 
        lv.setAdapter(new ArrayAdapter<String>(this, R.layout.list_item, this.file)); 
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() { 

              public void onItemClick(AdapterView<?> parent, View view,     int position, long id) { 
                    // When clicked, show a toast with the TextView text 
                    Toast.makeText(getApplicationContext(), ((TextView) view).getText(), Toast.LENGTH_SHORT).show(); 
              } 
        });         
        setContentView(lv);
    }

}

list_item.xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" 
    android:padding="10dp"   
    android:textSize="16sp"   
    android:textColor="#000">

</LinearLayout>

main.xml :

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:weightSum="1">
<ScrollView
    android:id="@+id/SCROLLER_ID"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:scrollbars="vertical"
    android:fillViewport="true">
        <TextView  
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" 
        android:padding="5sp"
        android:id="@+id/TextView01"
        android:text="@string/hello"/>
    </ScrollView>

</LinearLayout>

解决方案

The ArrayAdapter requires the resource ID to be a TextView XML exception means you don't supply what the ArrayAdapter expects. When you use this constructor:

new ArrayAdapter<String>(this, R.layout.a_layout_file, this.file)

R.Layout.a_layout_file must be the id of a xml layout file containing only a TextView(the TextView can't be wrapped by another layout, like a LinearLayout, RelativeLayout etc!), something like this:

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" 
    // other attributes of the TextView
/>

If you want your list row layout to be something a little different then a simple TextView widget use this constructor:

new ArrayAdapter<String>(this, R.layout.a_layout_file, 
   R.id.the_id_of_a_textview_from_the_layout, this.file)

where you supply the id of a layout that can contain various views, but also must contain a TextView with and id(the third parameter) that you pass to your ArrayAdapter so it can know where to put the Strings in the row layout.