本文介绍了无法在Android中填充ListView的EditText中的详细信息的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我创建了一个具有自定义列表视图的应用程序.我的列表视图包含一个edittext字段.但是我无法用value填充编辑文本.我是android的新手，所以很难发现错误.
I had created an app with custom listview. My listview contains an edittext field. But I can't fill edit text with value.I am new to android so it is hard to find error to me.
这是我的代码:
public class MainActivity extends Activity {
private ListView myList;
private MyAdapter myAdapter;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myList = (ListView) findViewById(R.id.MyList);
myList.setItemsCanFocus(true);
myAdapter = new MyAdapter();
myList.setAdapter(myAdapter);
}
public class MyAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public ArrayList myItems = new ArrayList();
public MyAdapter() {
mInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
for (int i = 0; i < 20; i++) {
ListItem listItem = new ListItem();
listItem.caption = "Caption" + i;
myItems.add(listItem);
}
notifyDataSetChanged();
}
public int getCount() {
return myItems.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.item, null);
holder.caption = (EditText) convertView
.findViewById(R.id.ItemCaption);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
//Fill EditText with the value you have in data source
holder.caption.setText(myItems.get(position).caption);
holder.caption.setId(position);
//we need to update adapter once we finish with editing
holder.caption.setOnFocusChangeListener(new OnFocusChangeListener() {
public void onFocusChange(View v, boolean hasFocus) {
if (!hasFocus){
final int position = v.getId();
final EditText Caption = (EditText) v;
myItems.get(position).caption = Caption.getText().toString();
}
}
});
return convertView;
}
}
class ViewHolder {
EditText caption;
}
class ListItem {
String caption;
}
}
item.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">
<EditText android:id="@+id/ItemCaption"
android:layout_height="40dp"
android:layout_width="fill_parent"
android:layout_marginLeft="2dip"
android:singleLine="true">
</EditText>
</LinearLayout>
activity_main.xml
activity_main.xml
推荐答案
尝试这种方式
list_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="@+id/ItemCaption"
android:layout_height="40dp"
android:layout_width="match_parent"
android:layout_marginLeft="2dp"
android:singleLine="true">
</EditText>
</LinearLayout>
activity_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="match_parent"
android:layout_height="match_parent">
<ListView
android:id="@+id/MyList"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:descendantFocusability="afterDescendants">
</ListView>
</LinearLayout>
MyActivity.java
public class MyActivity extends Activity {
private ListView myList;
private MyAdapter myAdapter;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myList = (ListView) findViewById(R.id.MyList);
myList.setItemsCanFocus(true);
myAdapter = new MyAdapter(this);
myList.setAdapter(myAdapter);
}
public class MyAdapter extends BaseAdapter {
private ArrayList<ListItem> myItems;
private Context context;
public MyAdapter(Context context) {
this.context = context;
myItems = new ArrayList<ListItem>();
for (int i = 0; i < 20; i++) {
ListItem listItem = new ListItem();
listItem.caption = "Caption" + i;
myItems.add(listItem);
}
}
public int getCount() {
return myItems.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = LayoutInflater.from(context).inflate(R.layout.list_item, null, false);
holder.caption = (EditText) convertView
.findViewById(R.id.ItemCaption);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.caption.setText(myItems.get(position).caption);
holder.caption.setTag(position);
holder.caption.setOnFocusChangeListener(new View.OnFocusChangeListener() {
public void onFocusChange(View v, boolean hasFocus) {
if (!hasFocus){
final int position = (Integer)v.getTag();
final EditText Caption = (EditText) v;
myItems.get(position).caption = Caption.getText().toString();
}
}
});
return convertView;
}
}
class ViewHolder {
EditText caption;
}
class ListItem {
String caption;
}
}
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