我正在开发一个Android应用程序,其中我已经创建了一个ListView。我需要在ListView的每一行中添加2个按钮。这2个按钮分别是添加和删除。当用户选择其中一个按钮时,应该执行一些操作。我该怎么做呢?
我正在开发一个Android应用程序,其中我已经创建了一个ListView。我需要在ListView的每一行中添加2个按钮。这2个按钮分别是添加和删除。当用户选择其中一个按钮时,应该执行一些操作。我该怎么做呢?
首先,您需要创建一个自定义的布局XML,该布局将表示列表中的单个项目。您将在此布局中添加两个按钮以及您希望从列表中显示的任何其他项目。
<?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" >
<TextView
android:id="@+id/list_item_string"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:paddingLeft="8dp"
android:textSize="18sp"
android:textStyle="bold" />
<Button
android:id="@+id/delete_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_marginRight="5dp"
android:text="Delete" />
<Button
android:id="@+id/add_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toLeftOf="@id/delete_btn"
android:layout_centerVertical="true"
android:layout_marginRight="10dp"
android:text="Add" />
</RelativeLayout>
接下来您需要创建一个自定义的ArrayAdapter类,用它来填充您的xml布局,并处理您的按钮和点击事件。
public class MyCustomAdapter extends BaseAdapter implements ListAdapter {
private ArrayList<String> list = new ArrayList<String>();
private Context context;
public MyCustomAdapter(ArrayList<String> list, Context context) {
this.list = list;
this.context = context;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int pos) {
return list.get(pos);
}
@Override
public long getItemId(int pos) {
return list.get(pos).getId();
//just return 0 if your list items do not have an Id variable.
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
View view = convertView;
if (view == null) {
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.my_custom_list_layout, null);
}
//Handle TextView and display string from your list
TextView listItemText = (TextView)view.findViewById(R.id.list_item_string);
listItemText.setText(list.get(position));
//Handle buttons and add onClickListeners
Button deleteBtn = (Button)view.findViewById(R.id.delete_btn);
Button addBtn = (Button)view.findViewById(R.id.add_btn);
deleteBtn.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
//do something
list.remove(position); //or some other task
notifyDataSetChanged();
}
});
addBtn.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
//do something
notifyDataSetChanged();
}
});
return view;
}
}
最后,在您的活动中,您可以实例化自定义的ArrayAdapter类,并将其设置为您的listview。
public class MyActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my_activity);
//generate list
ArrayList<String> list = new ArrayList<String>();
list.add("item1");
list.add("item2");
//instantiate custom adapter
MyCustomAdapter adapter = new MyCustomAdapter(list, this);
//handle listview and assign adapter
ListView lView = (ListView)findViewById(R.id.my_listview);
lView.setAdapter(adapter);
}
在删除按钮点击事件中
public void delete(View v){
ListView listview1;
ArrayList<E> datalist;
final int position = listview1.getPositionForView((View) v.getParent());
datalist.remove(position);
myAdapter.notifyDataSetChanged();
}
步骤1:创建activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#0099CC"
tools:context=".MainActivity" >
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:text="Multi Touch Listview"
android:textColor="#FFFFFF"
android:textSize="25sp" />
<ListView
android:id="@+id/listView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="@+id/textView"
android:layout_marginTop="5dp"
android:cacheColorHint="#00000000" />
</RelativeLayout>
第二步:创建row.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp"
tools:context=".MainActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="User Name"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView1"
android:layout_marginTop="5dp"
android:text="Address"
android:textAppearance="?android:attr/textAppearanceLarge"
android:textSize="16sp" />
<Button
android:id="@+id/button1"
android:layout_width="80dp"
android:layout_height="40dp"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:background="#FFFFFF"
android:focusable="false"
android:focusableInTouchMode="false"
android:text="Edit Data"
android:textColor="#0099CC" />
<Button
android:id="@+id/button2"
android:layout_width="80dp"
android:layout_height="40dp"
android:layout_alignParentRight="true"
android:layout_below="@+id/button1"
android:layout_marginTop="3dp"
android:background="#FFFFFF"
android:focusable="false"
android:focusableInTouchMode="false"
android:text="Delete"
android:textColor="#0099CC" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textView2"
android:layout_marginTop="5dp"
android:text="Location" />
</RelativeLayout>
第三步 创建User.java bean类
public class User {
String name;
String address;
String location;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getLocation() {
return location;
}
public void setLocation(String location) {
this.location = location;
}
public User(String name, String address, String location) {
super();
this.name = name;
this.address = address;
this.location = location;
}
}
第四步:创建UserCustomAdapter.java
public class UserCustomAdapter extends ArrayAdapter<User> {
Context context;
int layoutResourceId;
ArrayList<User> data = new ArrayList<User>();
public UserCustomAdapter(Context context, int layoutResourceId,
ArrayList<User> data) {
super(context, layoutResourceId, data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
View row = convertView;
UserHolder holder = null;
if (row == null) {
LayoutInflater inflater = ((Activity) context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new UserHolder();
holder.textName = (TextView) row.findViewById(R.id.textView1);
holder.textAddress = (TextView) row.findViewById(R.id.textView2);
holder.textLocation = (TextView) row.findViewById(R.id.textView3);
holder.btnEdit = (Button) row.findViewById(R.id.button1);
holder.btnDelete = (Button) row.findViewById(R.id.button2);
row.setTag(holder);
} else {
holder = (UserHolder) row.getTag();
}
User user = data.get(position);
holder.textName.setText(user.getName());
holder.textAddress.setText(user.getAddress());
holder.textLocation.setText(user.getLocation());
holder.btnEdit.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.i("Edit Button Clicked", "**********");
Toast.makeText(context, "Edit button Clicked",
Toast.LENGTH_LONG).show();
}
});
holder.btnDelete.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Log.i("Delete Button Clicked", "**********");
Toast.makeText(context, "Delete button Clicked",
Toast.LENGTH_LONG).show();
}
});
return row;
}
static class UserHolder {
TextView textName;
TextView textAddress;
TextView textLocation;
Button btnEdit;
Button btnDelete;
}
}
第五步 创建MainActivity.java
public class MainActivity extends Activity {
ListView userList;
UserCustomAdapter userAdapter;
ArrayList<User> userArray = new ArrayList<User>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
/**
* add item in arraylist
*/
userArray.add(new User("Mumer", "Spain", "Spain"));
userArray.add(new User("Jon", "EW", "USA"));
userArray.add(new User("Broom", "Span", "SWA"));
userArray.add(new User("Lee", "Aus", "AUS"));
userArray.add(new User("Jon", "EW", "USA"));
userArray.add(new User("Broom", "Span", "SWA"));
userArray.add(new User("Lee", "Aus", "AUS"));
/**
* set item into adapter
*/
userAdapter = new UserCustomAdapter(MainActivity.this, R.layout.row,
userArray);
userList = (ListView) findViewById(R.id.listView);
userList.setItemsCanFocus(false);
userList.setAdapter(userAdapter);
/**
* get on item click listener
*/
userList.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v,
final int position, long id) {
Log.i("List View Clicked", "**********");
Toast.makeText(MainActivity.this,
"List View Clicked:" + position, Toast.LENGTH_LONG)
.show();
}
});
}
}
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