Java 我的自定义ListView不显示任何内容
我是android的新手。我想创建一个自定义listview阵列适配器。我已经学习了一些教程,但是我的模拟器没有显示自定义ListView的任何内容。谁能帮我找出我的代码哪里出了问题?提前谢谢 这是我的自定义_listview_main.xmlJava 我的自定义ListView不显示任何内容,java,android,listview,Java,Android,Listview,我是android的新手。我想创建一个自定义listview阵列适配器。我已经学习了一些教程,但是我的模拟器没有显示自定义ListView的任何内容。谁能帮我找出我的代码哪里出了问题?提前谢谢 这是我的自定义_listview_main.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android
<?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">
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/customListView" />
</LinearLayout>
这是我的自定义_listview_row.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_vertical"
android:minHeight="64dp">
<!-- <ImageView
android:id="@+id/clv_imageView"
android:layout_width="32dp"
android:layout_height="32dp"
android:contentDescription="@string/empty"
android:layout_alignParentLeft="true"
android:layout_marginLeft="9dp"
android:layout_alignParentTop="true"/> -->
<TextView
android:id="@+id/clv_textView2"
android:layout_width="97dp"
android:layout_height="32dp"
android:layout_alignParentRight="true"
android:gravity="center_vertical"
android:text="@string/tv_definition"
android:textIsSelectable="true" />
<TextView
android:id="@+id/clv_textView"
android:layout_width="97dp"
android:layout_height="32dp"
android:layout_alignParentLeft="true"
android:gravity="center_vertical"
android:text="@string/tv_word"
android:textIsSelectable="true" />
</RelativeLayout>
这是我的MyPerformanceArrayaAdapter.java
import java.util.List;
import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
public class MyPerformanceArrayAdapter extends ArrayAdapter<DefinitionObject>{
private List<DefinitionObject> entries;
private Activity activity;
public MyPerformanceArrayAdapter(Activity a, int textViewResourceId, List<DefinitionObject> entries) {
super(a, textViewResourceId, entries);
this.entries = entries;
this.activity = a;
}
public static class ViewHolder{
public TextView item1;
public TextView item2;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = convertView;
ViewHolder holder;
if (v == null) {
LayoutInflater vi =
(LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
v = vi.inflate(R.layout.custom_listview_row, null);
holder = new ViewHolder();
holder.item1 = (TextView) v.findViewById(R.id.clv_textView);
holder.item2 = (TextView) v.findViewById(R.id.clv_textView2);
v.setTag(holder);
}
else
holder=(ViewHolder)v.getTag();
final DefinitionObject custom = entries.get(position);
if (custom != null) {
holder.item1.setText(custom.getWord());
holder.item2.setText(custom.getFav());
}
return v;
}
}
import java.util.List;
导入android.app.Activity;
导入android.content.Context;
导入android.view.LayoutInflater;
导入android.view.view;
导入android.view.ViewGroup;
导入android.widget.ArrayAdapter;
导入android.widget.TextView;
公共类MyPerformanceArrayAdapter扩展了ArrayAdapter{
私人名单条目;
私人活动;
public MyPerformanceArrayAdapter(活动a,int textViewResourceId,列表条目){
super(a,textViewResourceId,条目);
this.entries=条目;
本活动=a;
}
公共静态类视图持有者{
公共文本视图项目1;
公共文本视图项目2;
}
@凌驾
公共视图getView(int位置、视图转换视图、视图组父视图){
视图v=转换视图;
视窗座;
如果(v==null){
放平机六=
(LayoutInflater)activity.getSystemService(Context.LAYOUT\u充气机\u服务);
v=vi.充气(R.layout.custom\u listview\u行,空);
holder=新的ViewHolder();
holder.item1=(TextView)v.findViewById(R.id.clv_TextView);
holder.item2=(TextView)v.findViewById(R.id.clv_textView2);
v、 setTag(支架);
}
其他的
holder=(ViewHolder)v.getTag();
最终定义对象自定义=entries.get(位置);
如果(自定义!=null){
holder.item1.setText(custom.getWord());
holder.item2.setText(custom.getFav());
}
返回v;
}
}
最后,这是我的活动TempCLV.java
package com.example.myidictionary;
import java.util.List;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ListView;
public class TempCLV extends Activity {
private MySQLiteDefinitionHelper db;
String tblName = "";
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_listview_main);
Intent msjIntent = getIntent();
tblName = msjIntent.getStringExtra(WordDefinitionHomeActivity.TABLENAME2);
}
public void refresh()
{
db = new MySQLiteDefinitionHelper(this);
final List<DefinitionObject> values = db.getAllWords(tblName);
ListView mylist = (ListView)findViewById(R.id.customListView);
MyPerformanceArrayAdapter adapter = new MyPerformanceArrayAdapter(this, R.id.customListView, values);
mylist.setAdapter(adapter);
}
}
package com.example.myidictionary;
导入java.util.List;
导入android.app.Activity;
导入android.content.Intent;
导入android.os.Bundle;
导入android.widget.ListView;
公共类TempCLV扩展活动{
私有MySQLiteDefinitionHelper数据库;
字符串tblName=“”;
/**在首次创建活动时调用*/
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.custom\u listview\u main);
Intent msjIntent=getIntent();
tblName=msjIntent.getStringExtra(WordDefinitionHomeActivity.TABLENAME2);
}
公共无效刷新()
{
db=新的MySQLiteDefinitionHelper(此);
最终列表值=db.getAllWords(tblName);
ListView mylist=(ListView)findViewById(R.id.customListView);
MyPerformanceArrayAdapter=新的MyPerformanceArrayAdapter(此,R.id.customListView,值);
mylist.setAdapter(适配器);
}
}
您需要在onCreate
中调用refresh
,因为您正在将适配器设置为列表视图
确保您的值中有一些数据
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.custom_listview_main);
Intent msjIntent = getIntent();
tblName = msjIntent.getStringExtra(WordDefinitionHomeActivity.TABLENAME2);
refresh();
}
您还可以将充气机初始化移动到适配器类的构造函数。无需在getView
LayoutInflater vi;
public MyPerformanceArrayAdapter(Activity a, int textViewResourceId,List<DefinitionObject> entries) {
super(a, textViewResourceId, entries);
this.entries = entries;
vi =(LayoutInflater)a.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
layoutiner-vi;
public MyPerformanceArrayAdapter(活动a,int textViewResourceId,列表条目){
super(a,textViewResourceId,条目);
this.entries=条目;
vi=(LayoutInflater)a.getSystemService(Context.LAYOUT\u INFLATER\u SERVICE);
}
请至少第一次调用refresh方法来设置MainActivity中适配器的“onCreate
方法” 你确定值包含某些内容吗?@blackbelt refresh是他设置适配器的地方,我看不到它在任何地方被调用,你可能对包含某些数据的值的说法是正确的,refresh
没有被调用..谢谢你,先生。我忘记了,也没有意识到没有被调用的函数-__-"