ListView动态添加控件
2015-08-10 11:38
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在项目中有时候要用到ListView动态添加一些Item,今天研究了一下,一贯还是使用BaseAdapter
创建一个AddNumberBaseAdpater类用来适配ListView
[java]
view plaincopyprint?
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageButton;
import com.example.mobilephone.R;
public class AddNumberBaseAdpater extends BaseAdapter {
private LayoutInflater mInflater;
private ArrayList<String> text;
public AddNumberBaseAdpater(Context context) {
text = new ArrayList<String>();
text.add("第一项");// 默认只加载一个Item
this.mInflater = LayoutInflater.from(context);
}
public int getCount() {
// TODO Auto-generated method stub
return text.size();
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return text.get(position);
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder = new ViewHolder();
if (convertView == null) {
convertView = mInflater.inflate(R.layout.addnumber, null);
holder.btnOpen = (ImageButton) convertView
.findViewById(R.id.ibtnAddNumber);
holder.editText = (EditText) convertView
.findViewById(R.id.editNumber);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
switch (position) {// 不要以为XML文件中是2个按钮,其实只有一个
case 0:
holder.btnOpen.setBackgroundResource(R.drawable.addnumber);// 第一项按钮则显示加号图片
break;
default:
holder.btnOpen.setBackgroundResource(R.drawable.deletenumber);// 超过了一项则显示减号图片,可以删除
break;
}
holder.btnOpen.setOnClickListener(new View.OnClickListener() {// 添加按钮
public void onClick(View v) {
if (position == 0) {
text.add("xxx");// 添加一项控件
} else if (position > 0) {// 始终留一项不能删除
text.remove(text.size() - 1);// 删除按钮
}
notifyDataSetChanged();
}
});
return convertView;
}
public final class ViewHolder {
public EditText editText;
public ImageButton btnOpen;
}
}
主MainActivity
[java]
view plaincopyprint?
import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import com.example.mobilephone.adpater.AddNumberBaseAdpater;
public class MainActivity extends Activity {
private ListView myList; // ListView控件
private AddNumberBaseAdpater addNumberBaseAdpater;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.moble_input);
addNumberBaseAdpater=new AddNumberBaseAdpater(getApplicationContext());
myList = (ListView) findViewById(R.id.listview1);
myList.setAdapter(addNumberBaseAdpater);
}
}
自定义XML文件
[html]
view plaincopyprint?
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relativeNumber"
android:layout_width="500px"
android:layout_height="100px"
android:layout_below="@+id/relativeLayout1"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp" >
<EditText
android:id="@+id/editNumber"
android:layout_width="300px"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:gravity="center_vertical"
android:layout_centerHorizontal="true"
android:layout_marginLeft="16dp"
android:background="@drawable/number_input"
android:ems="10" />
<ImageButton
android:id="@+id/ibtnAddNumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:focusable="true"
android:layout_toRightOf="@+id/editNumber"
android:background="@drawable/addnumber" />
</RelativeLayout>
主XML文件
[html]
view plaincopyprint?
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFFF"
android:orientation="vertical" >
<ListView
android:id="@+id/listview1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:cacheColorHint="#00000000"
android:layout_centerHorizontal="true"
android:divider="#FFFFFF"
android:dividerHeight="0px"
android:fadingEdge="none"
android:listSelector="#00000000" >
</ListView>
<TextView
android:id="@+id/textVie"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_below="@+id/listview1"
android:text="@string/input"
android:textSize="18dp" />
</RelativeLayout>
最后运行效果如下,第一次显示
![](http://img.my.csdn.net/uploads/201209/25/1348586926_8713.png)
点击加号按钮后运行效果如下:
![](http://img.my.csdn.net/uploads/201209/25/1348586966_2989.png)
点击减号删除
在项目中有时候要用到ListView动态添加一些Item,今天研究了一下,一贯还是使用BaseAdapter
创建一个AddNumberBaseAdpater类用来适配ListView
[java]
view plaincopyprint?
import java.util.ArrayList;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.EditText;
import android.widget.ImageButton;
import com.example.mobilephone.R;
public class AddNumberBaseAdpater extends BaseAdapter {
private LayoutInflater mInflater;
private ArrayList<String> text;
public AddNumberBaseAdpater(Context context) {
text = new ArrayList<String>();
text.add("第一项");// 默认只加载一个Item
this.mInflater = LayoutInflater.from(context);
}
public int getCount() {
// TODO Auto-generated method stub
return text.size();
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return text.get(position);
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ViewHolder holder = new ViewHolder();
if (convertView == null) {
convertView = mInflater.inflate(R.layout.addnumber, null);
holder.btnOpen = (ImageButton) convertView
.findViewById(R.id.ibtnAddNumber);
holder.editText = (EditText) convertView
.findViewById(R.id.editNumber);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
switch (position) {// 不要以为XML文件中是2个按钮,其实只有一个
case 0:
holder.btnOpen.setBackgroundResource(R.drawable.addnumber);// 第一项按钮则显示加号图片
break;
default:
holder.btnOpen.setBackgroundResource(R.drawable.deletenumber);// 超过了一项则显示减号图片,可以删除
break;
}
holder.btnOpen.setOnClickListener(new View.OnClickListener() {// 添加按钮
public void onClick(View v) {
if (position == 0) {
text.add("xxx");// 添加一项控件
} else if (position > 0) {// 始终留一项不能删除
text.remove(text.size() - 1);// 删除按钮
}
notifyDataSetChanged();
}
});
return convertView;
}
public final class ViewHolder {
public EditText editText;
public ImageButton btnOpen;
}
}
import java.util.ArrayList; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.EditText; import android.widget.ImageButton; import com.example.mobilephone.R; public class AddNumberBaseAdpater extends BaseAdapter { private LayoutInflater mInflater; private ArrayList<String> text; public AddNumberBaseAdpater(Context context) { text = new ArrayList<String>(); text.add("第一项");// 默认只加载一个Item this.mInflater = LayoutInflater.from(context); } public int getCount() { // TODO Auto-generated method stub return text.size(); } public Object getItem(int position) { // TODO Auto-generated method stub return text.get(position); } public long getItemId(int position) { // TODO Auto-generated method stub return position; } public View getView(final int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub ViewHolder holder = new ViewHolder(); if (convertView == null) { convertView = mInflater.inflate(R.layout.addnumber, null); holder.btnOpen = (ImageButton) convertView .findViewById(R.id.ibtnAddNumber); holder.editText = (EditText) convertView .findViewById(R.id.editNumber); convertView.setTag(holder); } else { holder = (ViewHolder) convertView.getTag(); } switch (position) {// 不要以为XML文件中是2个按钮,其实只有一个 case 0: holder.btnOpen.setBackgroundResource(R.drawable.addnumber);// 第一项按钮则显示加号图片 break; default: holder.btnOpen.setBackgroundResource(R.drawable.deletenumber);// 超过了一项则显示减号图片,可以删除 break; } holder.btnOpen.setOnClickListener(new View.OnClickListener() {// 添加按钮 public void onClick(View v) { if (position == 0) { text.add("xxx");// 添加一项控件 } else if (position > 0) {// 始终留一项不能删除 text.remove(text.size() - 1);// 删除按钮 } notifyDataSetChanged(); } }); return convertView; } public final class ViewHolder { public EditText editText; public ImageButton btnOpen; } }
主MainActivity
[java]
view plaincopyprint?
import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import com.example.mobilephone.adpater.AddNumberBaseAdpater;
public class MainActivity extends Activity {
private ListView myList; // ListView控件
private AddNumberBaseAdpater addNumberBaseAdpater;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.moble_input);
addNumberBaseAdpater=new AddNumberBaseAdpater(getApplicationContext());
myList = (ListView) findViewById(R.id.listview1);
myList.setAdapter(addNumberBaseAdpater);
}
}
import android.app.Activity; import android.os.Bundle; import android.widget.ListView; import com.example.mobilephone.adpater.AddNumberBaseAdpater; public class MainActivity extends Activity { private ListView myList; // ListView控件 private AddNumberBaseAdpater addNumberBaseAdpater; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.moble_input); addNumberBaseAdpater=new AddNumberBaseAdpater(getApplicationContext()); myList = (ListView) findViewById(R.id.listview1); myList.setAdapter(addNumberBaseAdpater); } }
自定义XML文件
[html]
view plaincopyprint?
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relativeNumber"
android:layout_width="500px"
android:layout_height="100px"
android:layout_below="@+id/relativeLayout1"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp" >
<EditText
android:id="@+id/editNumber"
android:layout_width="300px"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:gravity="center_vertical"
android:layout_centerHorizontal="true"
android:layout_marginLeft="16dp"
android:background="@drawable/number_input"
android:ems="10" />
<ImageButton
android:id="@+id/ibtnAddNumber"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:focusable="true"
android:layout_toRightOf="@+id/editNumber"
android:background="@drawable/addnumber" />
</RelativeLayout>
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/relativeNumber" android:layout_width="500px" android:layout_height="100px" android:layout_below="@+id/relativeLayout1" android:layout_centerHorizontal="true" android:layout_marginTop="20dp" > <EditText android:id="@+id/editNumber" android:layout_width="300px" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:gravity="center_vertical" android:layout_centerHorizontal="true" android:layout_marginLeft="16dp" android:background="@drawable/number_input" android:ems="10" /> <ImageButton android:id="@+id/ibtnAddNumber" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:focusable="true" android:layout_toRightOf="@+id/editNumber" android:background="@drawable/addnumber" /> </RelativeLayout>
主XML文件
[html]
view plaincopyprint?
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFFF"
android:orientation="vertical" >
<ListView
android:id="@+id/listview1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:cacheColorHint="#00000000"
android:layout_centerHorizontal="true"
android:divider="#FFFFFF"
android:dividerHeight="0px"
android:fadingEdge="none"
android:listSelector="#00000000" >
</ListView>
<TextView
android:id="@+id/textVie"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_below="@+id/listview1"
android:text="@string/input"
android:textSize="18dp" />
</RelativeLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#FFFFFF" android:orientation="vertical" > <ListView android:id="@+id/listview1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:cacheColorHint="#00000000" android:layout_centerHorizontal="true" android:divider="#FFFFFF" android:dividerHeight="0px" android:fadingEdge="none" android:listSelector="#00000000" > </ListView> <TextView android:id="@+id/textVie" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_below="@+id/listview1" android:text="@string/input" android:textSize="18dp" /> </RelativeLayout>
最后运行效果如下,第一次显示
![](http://img.my.csdn.net/uploads/201209/25/1348586926_8713.png)
点击加号按钮后运行效果如下:
![](http://img.my.csdn.net/uploads/201209/25/1348586966_2989.png)
点击减号删除
![](http://img.my.csdn.net/uploads/201209/25/1348586994_8666.png)
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