ArrayAdapter要求ID是一个TextView错误 [英] ArrayAdapter requires ID to be a TextView error
问题描述
我想创建我的列表项一个不错的布局,但我的code,只有当它被简化这样的工作。
< XML版本=1.0编码=UTF-8&GT?;
< TextView中的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =FILL_PARENT
机器人:layout_height =FILL_PARENT
机器人:填充=10dp
机器人:TEXTSIZE =16SP>
< / TextView的>
当我添加一点点编译和运行,但在启动它的力量关闭,给我的错误ArrayAdapter要求ID是一个TextView。
< RelativeLayout的的xmlns:机器人=http://schemas.android.com/apk/res/android
机器人:layout_width =FILL_PARENT
机器人:layout_height =机器人:ATTR /列表preferredItemHeight
机器人:填充=6dip>
< ImageView的
机器人:ID =@ + ID / ICON1
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =FILL_PARENT
机器人:layout_alignParentBottom =真
机器人:layout_alignParentTop =真
机器人:layout_marginRight =6dip
机器人:SRC =@可绘制/ ic_launcher/>
<的TextView
机器人:ID =@ + ID / secondLine
机器人:layout_width =FILL_PARENT
机器人:layout_height =26dip
机器人:layout_alignParentBottom =真
机器人:layout_alignParentRight =真
机器人:layout_toRightOf =@ ID / ICON1
机器人:ellipsize =金字招牌
机器人:单线=真
机器人:文本=一些信息/>
<的TextView
机器人:ID =@ + ID / textView1
机器人:layout_width =FILL_PARENT
机器人:layout_height =WRAP_CONTENT
机器人:layout_above =@ ID / secondLine
机器人:layout_alignParentTop =真
机器人:layout_alignWithParentIfMissing =真
机器人:layout_toRightOf =@ ID / ICON1
机器人:重力=center_vertical
机器人:文本=一些信息/>
< ImageView的
机器人:ID =@ + ID /图标2
机器人:layout_width =WRAP_CONTENT
机器人:layout_height =FILL_PARENT
机器人:layout_alignParentRight =真
机器人:layout_alignParentTop =真
机器人:layout_marginRight =6dip
机器人:SRC =@可绘制/ ic_launcher/>
< / RelativeLayout的>
公共类FirstLoginActivity扩展ListActivity {
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
的String [] testcontacts = getResources()。getStringArray(
R.array.testcontacts_array);
setListAdapter(新ArrayAdapter<字符串>(这一点,R.layout.list_items,
testcontacts));
ListView的LV = getListView();
lv.setTextFilterEnabled(真正的);
lv.setOnItemClickListener(新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中)查看).getText(),Toast.LENGTH_SHORT).show();
}
});
}
我是pretty的肯定,我这样做的权利,我经历了许多教程和我发现,最快速,最有效的方法是创建一个静态ViewHolder类。其中一个教程试图直接访问数据是什么,我要怎样做。我仍然有点困惑如何做到这一点。
公共类FirstLoginActivity扩展ListActivity {
语境mContext;
名单mList;
的String [] testcontacts = getResources()。getStringArray(
R.array.testcontacts_array);
@覆盖
公共无效的onCreate(包savedInstanceState){
super.onCreate(savedInstanceState);
setListAdapter(新ArrayAdapter<字符串>(这一点,R.layout.list_items,
testcontacts));
ListView的LV = getListView();
lv.setTextFilterEnabled(真正的);
lv.setOnItemClickListener(新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中)查看).getText(),Toast.LENGTH_SHORT).show();
}
});
}
公共查看getView(INT位置,查看convertview,ViewGroup中父){
ViewHolder持有人;
视图V = convertview;
如果(V == NULL){
LayoutInflater充气=(LayoutInflater)LayoutInflater
。从(mContext);
V = inflater.inflate(R.layout.list_items,NULL);
持有人=新ViewHolder();
holder.firstLine =(TextView中)v.findViewById(R.id.firstLine);
holder.secondLine =(TextView中)v.findViewById(R.id.secondLine);
holder.icon1 =(ImageView的)v.findViewById(R.id.icon1);
holder.icon2 =(ImageView的)v.findViewById(R.id.icon2);
v.setTag(保持器);
} 其他 {
支架=(ViewHolder)v.getTag();
}
holder.firstLine.setText(testcontacts [位置]);
holder.secondLine.setText(testcontacts [位置]);
// holder.icon1.setImageBitmap((位置和放大器; 1)== 1 mIcon1:mIcon2);
//直接调用图像?
返回伏;
}
静态类ViewHolder {
TextView的firstLine中;
TextView的secondLine;
ImageView的ICON1;
ImageView的图标2;
}
}
您可能正在使用像这样(的这里的DOC ):
ArrayAdapter<字符串>适配器=新的ArrayAdapter<字符串>(这一点,R.layout.layout_1,价值观);
在这种情况下,你的布局必须与一个TextView一个简单的布局。
如果你想使用自己的布局,你需要编写一个自定义适配器。
I am trying to create a nice layout for my list items, but my code only works when it is simplified 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="fill_parent"
android:padding="10dp"
android:textSize="16sp" >
</TextView>
when i add a little bit more it compiles and runs but it force closes on start and gives me the error "ArrayAdapter requires ID to be a TextView."
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:padding="6dip" >
<ImageView
android:id="@+id/icon1"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentBottom="true"
android:layout_alignParentTop="true"
android:layout_marginRight="6dip"
android:src="@drawable/ic_launcher" />
<TextView
android:id="@+id/secondLine"
android:layout_width="fill_parent"
android:layout_height="26dip"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_toRightOf="@id/icon1"
android:ellipsize="marquee"
android:singleLine="true"
android:text="Some more information" />
<TextView
android:id="@+id/textView1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_above="@id/secondLine"
android:layout_alignParentTop="true"
android:layout_alignWithParentIfMissing="true"
android:layout_toRightOf="@id/icon1"
android:gravity="center_vertical"
android:text="Some Information" />
<ImageView
android:id="@+id/icon2"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="6dip"
android:src="@drawable/ic_launcher" />
</RelativeLayout>
public class FirstLoginActivity extends ListActivity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
String[] testcontacts = getResources().getStringArray(
R.array.testcontacts_array);
setListAdapter(new ArrayAdapter<String>(this, R.layout.list_items,
testcontacts));
ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new 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();
}
});
}
I am pretty sure i'm doing this right, i've been through numerous tutorials and i've found that the fastest and most efficient way is to create a static ViewHolder class. One of the tutorials tried accessing the data directly which is what i was trying to do. I'm still a little confused on how to do so.
public class FirstLoginActivity extends ListActivity {
Context mContext;
List mList;
String[] testcontacts = getResources().getStringArray(
R.array.testcontacts_array);
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(this, R.layout.list_items,
testcontacts));
ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new 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();
}
});
}
public View getView(int position, View convertview, ViewGroup parent) {
ViewHolder holder;
View v = convertview;
if (v == null) {
LayoutInflater inflater = (LayoutInflater) LayoutInflater
.from(mContext);
v = inflater.inflate(R.layout.list_items, null);
holder = new ViewHolder();
holder.firstLine = (TextView) v.findViewById(R.id.firstLine);
holder.secondLine = (TextView) v.findViewById(R.id.secondLine);
holder.icon1 = (ImageView) v.findViewById(R.id.icon1);
holder.icon2 = (ImageView) v.findViewById(R.id.icon2);
v.setTag(holder);
} else {
holder = (ViewHolder) v.getTag();
}
holder.firstLine.setText(testcontacts[position]);
holder.secondLine.setText(testcontacts[position]);
// holder.icon1.setImageBitmap((position & 1) == 1 ? mIcon1: mIcon2);
//call the images directly?
return v;
}
static class ViewHolder {
TextView firstLine;
TextView secondLine;
ImageView icon1;
ImageView icon2;
}
}
You are probably using something like this (here the doc):
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.layout_1, values);
in that case your layout must be a simple layout with a TextView.
If you wanna use your own layout you need to write a custom adapter.
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