在android上用自定义适配器，数组列表和hashmap填充自定义列表视图
我有一个自定义列表视图（像打击），我有一个填充hashmap的数组列表
现在我想用自定义适配器，数组列表和hashmap
填充自定义列表视图我尝试了很多并且检查了很多问题，但我没有成功
这是我的自定义适配器代码
public class messages_Adapter extends ArrayAdapter<HashMap<String, String>>
{
ArrayList<HashMap<String, String>> MessageAdapter=new ArrayList<HashMap<String,String>>();
Context context;
int layoutResourceId;
public messages_Adapter(Context context,int layoutResourceId,ArrayList<HashMap<String, String>> MessageAdapter)
{
super(context, layoutResourceId, MessageAdapter);
this.MessageAdapter=MessageAdapter;
this.context=context;
this.layoutResourceId=layoutResourceId;
}
@Override
public View getView(int position, View convertView, ViewGroup parrent)
{
HashMap<String, String>hashmap_Current;
View view=convertView;
if (view==null)
{
LayoutInflater layoutInflater=(LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view=layoutInflater.inflate(layoutResourceId, parrent, false);
}
hashmap_Current=new HashMap<String, String>();
hashmap_Current=MessageAdapter.get(position);
Log.e("Zdit", hashmap_Current.toString());
TextView lbl_MessageID= (TextView)findViewById(id.xActMessages_LblMessageID);
lbl_MessageID.setText(hashmap_Current.get("id").toString());
view.setTag(lbl_MessageID);
TextView lbl_MessageContent= (TextView)findViewById(id.xActMessages_LblMessageText);
lbl_MessageContent.setText(hashmap_Current.get("message"));
view.setTag(lbl_MessageContent);
TextView lbl_TimeAdd= (TextView)findViewById(id.xActMessages_LblTimeAdd);
lbl_TimeAdd.setText(hashmap_Current.get("time_add"));
view.setTag(lbl_TimeAdd);
TextView lbl_DateAdd= (TextView)findViewById(id.xActMessages_LblDateAdd);
lbl_DateAdd.setText(hashmap_Current.get("date_add"));
view.setTag(lbl_DateAdd);
return view;
}
}
这是我的猫咪日志
10-12 13:41:13.181: E/AndroidRuntime(2298): FATAL EXCEPTION: main
10-12 13:41:13.181: E/AndroidRuntime(2298): Process: com.TB.Zdit, PID: 2298
10-12 13:41:13.181: E/AndroidRuntime(2298): java.lang.NullPointerException
10-12 13:41:13.181: E/AndroidRuntime(2298): at com.TB.Zdit.JAct_Messages$messages_Adapter.getView(JAct_Messages.java:243)
10-12 13:41:13.181: E/AndroidRuntime(2298): at android.widget.AbsListView.obtainView(AbsListView.java:2263)
10-12 13:41:13.181: E/AndroidRuntime(2298): at android.widget.ListView.measureHeightOfChildren(ListView.java:1263)
10-12 13:41:13.181: E/AndroidRuntime(2298): at android.widget.ListView.onMeasure(ListView.java:1175)
10-12 13:41:13.181: E/AndroidRuntime(2298): at android.view.View.measure(View.java:16458)
10-12 13:41:13.181: E/AndroidRuntime(2298): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5125)
10-12 13:41:13.181: E/AndroidRuntime(2298): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1404)
10-12 13:41:13.181: E/AndroidRuntime(2298): at android.widget.LinearLayout.measureVertical(LinearLayout.java:695)
10-12 13:41:13.181: E/AndroidRuntime(2298): at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
10-12 13:41:13.181: E/AndroidRuntime(2298): at android.view.View.measure(View.java:16458)
消息适配器
do
{
hashMap_Messages=new HashMap<String, String>();
hashMap_Messages.put("id", cursor_Fetcher.getString(0));
hashMap_Messages.put("message", cursor_Fetcher.getString(1));
hashMap_Messages.put("time_add", cursor_Fetcher.getString(2));
hashMap_Messages.put("date_add", cursor_Fetcher.getString(3));
arrayList_Messages.add(hashMap_Messages);
}
while (cursor_Fetcher.moveToNext());
messages_Adapter messAdapter=new messages_Adapter(getApplicationContext(),R.layout.xact_messages, arrayList_Messages);
lstViw_Messages.setAdapter(messAdapter);
自定义列表视图xml文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="5sp"
android:background="@drawable/linerlayout_border"
android:paddingTop="5sp"
android:paddingBottom="5sp"
android:layout_marginTop="5sp"
android:layout_marginBottom="5sp" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<TextView
android:id="@+id/xActMessages_LblMessageText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Message Content\nMessage Content\nMessage Content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:gravity="right"
android:textColor="#000000" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:visibility="invisible" >
<TextView
android:id="@+id/xActMessages_LblMessageID"
android:layout_width="0sp"
android:layout_height="0sp"
android:text="Message ID"
android:textAppearance="?android:attr/textAppearanceMedium"
android:gravity="right" />
</LinearLayout>
<LinearLayout
android:baselineAligned="false"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:weightSum="100"
android:orientation="horizontal"
android:paddingTop="20sp" >
<LinearLayout
android:layout_width="0sp"
android:layout_height="wrap_content"
android:layout_weight="60" >
<Button
android:id="@+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="48dp"
android:layout_height="48dp"
android:background="@drawable/button_ok"
android:textColor="#FFFFFF"
android:drawableLeft="@drawable/sharethis_32_white"
android:paddingLeft="7dp"
android:layout_marginRight="5dp" />
<Button
android:id="@+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="48dp"
android:layout_height="48dp"
android:background="@drawable/button_add"
android:textColor="#FFFFFF"
android:drawableLeft="@drawable/edit_32_white"
android:paddingLeft="7dp"
android:layout_marginRight="5dp" />
<Button
android:id="@+id/button1"
style="?android:attr/buttonStyleSmall"
android:layout_width="48dp"
android:layout_height="48dp"
android:textColor="#FFFFFF"
android:background="@drawable/button_delete"
android:drawableLeft="@drawable/delete_32_delete"
android:paddingLeft="7dp" />
</LinearLayout>
<LinearLayout
android:layout_width="0sp"
android:layout_height="match_parent"
android:layout_weight="40"
android:orientation="vertical"
android:weightSum="100" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0sp"
android:orientation="vertical"
android:gravity="center"
android:layout_weight="50" >
<TextView
android:id="@+id/xActMessages_LblTimeAdd"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Time"
android:textColor="#000000" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0sp"
android:orientation="vertical"
android:gravity="center"
android:layout_weight="50">
<TextView
android:id="@+id/xActMessages_LblDateAdd"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:text="Date"
android:textColor="#000000" />
</LinearLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
</LinearLayout>
谢谢
1 个答案:
答案 0 :(得分：4)
我使用ViewHolder方法制作了新的适配器代码试试这个：
public class messages_Adapter extends ArrayAdapter<HashMap<String, String>>
{
ArrayList<HashMap<String, String>> MessageAdapter=new ArrayList<HashMap<String,String>>();
Context context;
int layoutResourceId;
public messages_Adapter(Context context,int layoutResourceId,ArrayList<HashMap<String, String>> MessageAdapter)
{
super(context, layoutResourceId, MessageAdapter);
this.MessageAdapter=MessageAdapter;
this.context=context;
this.layoutResourceId=layoutResourceId;
}
@Override
public View getView(int position, View convertView, ViewGroup parrent)
{
HashMap<String, String>hashmap_Current;
View view=convertView;
final ViewHolder holder;
if (view==null)
{
LayoutInflater layoutInflater=(LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view=layoutInflater.inflate(layoutResourceId, parrent, false);
holder=new ViewHolder();
holder.lbl_MessageID=(TextView)view.findViewById(id.xActMessages_LblMessageID);
holder.lbl_MessageContent=(TextView)view.findViewById(id.xActMessages_LblMessageText);
holder.lbl_TimeAdd=(TextView)view.findViewById(id.xActMessages_LblTimeAdd);
holder.lbl_DateAdd=(TextView)view.findViewById(id.xActMessages_LblDateAdd);
view.setTag(holder);
}else{
holder=(ViewHolder)view.getTag();
}
hashmap_Current=new HashMap<String, String>();
hashmap_Current=MessageAdapter.get(position);
Log.e("Zdit", hashmap_Current.toString());
holder.lbl_MessageID.setText(hashmap_Current.get("id").toString());
holder.lbl_MessageContent.setText(hashmap_Current.get("message"));
holder.lbl_TimeAdd.setText(hashmap_Current.get("time_add"));
holder.lbl_DateAdd.setText(hashmap_Current.get("date_add"));
return view;
}
static class ViewHolder {
TextView lbl_MessageID, lbl_MessageContent,lbl_TimeAdd,lbl_DateAdd;
}
}
相关问题
最新问题
- 我写了这段代码，但我无法理解我的错误
- 我无法从一个代码实例的列表中删除 None 值，但我可以在另一个实例中。为什么它适用于一个细分市场而不适用于另一个细分市场？
- 是否有可能使 loadstring 不可能等于打印？卢阿
- java中的random.expovariate()
- Appscript 通过会议在 Google 日历中发送电子邮件和创建活动
- 为什么我的 Onclick 箭头功能在 React 中不起作用？
- 在此代码中是否有使用“this”的替代方法？
- 在 SQL Server 和 PostgreSQL 上查询，我如何从第一个表获得第二个表的可视化
- 每千个数字得到
- 更新了城市边界 KML 文件的来源？