本文介绍了填充自定义适配器，数组列表和HashMap android上的自定义列表视图的处理方法，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
我有一个自定义列表视图（如吹），我有与HashMap的填充数组列表
i have a custom list view(like blow) and i have an array list that fill with hashmap
现在我想，以填补自定义适配器，数组列表和HashMap自定义列表视图
now i want to fill custom list view with custom adapter,array list and hashmap
我尝试了很多，检查许多问题，但我不是成功
i try a lot and check many question but i'm not success
这是我的自定义适配器code
here's my custom adapter code
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;
}
}
这是我的猫的日志
and this is my cat log
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
custom list view xml file
<?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>
感谢您
推荐答案
我有了新的适配器code。使用ViewHolder方法试试这个：
I have made new Adapter Code using ViewHolder Method Try this one:
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;
}
}
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