一手遮天 Android - view（ListView）: ListView 多选删除
一手遮天 Android - view（ListView）: ListView 多选删除
示例如下:
/view/listview/ListViewDemo10.java
/**
* ListView 多选删除
*
* 本例的数据源的每条数据都有一个 isChecked 属性，选中或取消选中都要修改这个属性，是否是选中状态以及是否需要删除也都是通过这个属性判断
*/
package com.webabcd.androiddemo.view.listview;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.ListView;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import com.webabcd.androiddemo.R;
import java.util.ArrayList;
import java.util.List;
public class ListViewDemo10 extends AppCompatActivity {
private ListView mListView1;
private Button mButton1;
private Button mButton2;
private Button mButton3;
private Button mButton4;
List<ListViewDemo10.MyData> mDataList;
private ListViewDemo10.MyAdapter mAdapter;
// 当前界面是否是编辑模式
private boolean mIsEditing;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_listview_listviewdemo10);
mListView1 = findViewById(R.id.listView1);
mButton1 = findViewById(R.id.button1);
mButton2 = findViewById(R.id.button2);
mButton3 = findViewById(R.id.button3);
mButton4 = findViewById(R.id.button4);
sample();
}
private void sample() {
// 构造数据
mDataList = new ArrayList<>();
for (int i = 0; i < 100; i++) {
mDataList.add(new ListViewDemo10.MyData("item " + i, false));
}
// 实例化自定义的 BaseAdapter
mAdapter = new ListViewDemo10.MyAdapter(mDataList, this);
mListView1.setAdapter(mAdapter);
// 显示复选框，并进入编进模式
mButton1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mButton1.setVisibility(View.GONE);
mButton2.setVisibility(View.VISIBLE);
mButton3.setVisibility(View.VISIBLE);
mButton4.setVisibility(View.VISIBLE);
mIsEditing = true;
// 刷新 ListView
mAdapter.notifyDataSetChanged();
}
});
// 隐藏复选框，并退出编进模式
mButton2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mButton1.setVisibility(View.VISIBLE);
mButton2.setVisibility(View.GONE);
mButton3.setVisibility(View.GONE);
mButton4.setVisibility(View.GONE);
mIsEditing = false;
// 刷新 ListView
mAdapter.notifyDataSetChanged();
}
});
// 全选
mButton3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
for (ListViewDemo10.MyData data : mDataList) {
data.setIsChecked(true);
}
// 刷新 ListView
mAdapter.notifyDataSetChanged();
}
});
// 删除选中
mButton4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// api level 24 或以上，且 jdk 1.8 则可以通过如下方式删除
// mDataList.removeIf(p -> p.getIsChecked());
int dataCount = mDataList.size();
for (int i = 0; i < dataCount; i++) {
ListViewDemo10.MyData data = mDataList.get(i);
if (data.getIsChecked()) {
mDataList.remove(i);
dataCount--;
i--;
}
}
// 刷新 ListView
mAdapter.notifyDataSetChanged();
}
});
// item 的点击事件
mListView1.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (mIsEditing) {
ListViewDemo10.MyData data = mDataList.get(position);
data.setIsChecked(!data.getIsChecked());
// 刷新 ListView
mAdapter.notifyDataSetChanged();
}
}
});
}
class MyData {
private String _name;
private boolean _isChecked; // 是否是选中状态
public MyData() {
}
public MyData(String name, boolean isChecked) {
this._name = name;
this._isChecked = isChecked;
}
public String getName() {
return _name;
}
public void setName(String name) {
this._name = name;
}
public boolean getIsChecked() {
return _isChecked;
}
public void setIsChecked(boolean isChecked) {
this._isChecked = isChecked;
}
}
class MyAdapter extends BaseAdapter {
private List<ListViewDemo10.MyData> _myDataList;
private Context _context;
public MyAdapter(List<ListViewDemo10.MyData> myDataList, Context context) {
this._myDataList = myDataList;
this._context = context;
}
@Override
public int getCount() {
return _myDataList.size();
}
@Override
public Object getItem(int position) {
return _myDataList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ListViewDemo10.MyData data = _myDataList.get(position);
ListViewDemo10.MyAdapter.ViewHolder holder = null;
if (convertView == null) {
convertView = LayoutInflater.from(_context).inflate(R.layout.item_view_listview_listviewdemo10, parent, false);
holder = new ListViewDemo10.MyAdapter.ViewHolder();
holder.txtName = convertView.findViewById(R.id.txtName);
holder.checkBox = convertView.findViewById(R.id.checkBox1);
convertView.setTag(holder);
} else {
holder = (ListViewDemo10.MyAdapter.ViewHolder) convertView.getTag();
}
// 复选框选中或取消选中后要更新数据源的 isChecked 属性
// 如果使用了 convertView 复用的方式，则必须在 setChecked() 之前 setOnCheckedChangeListener()
// 否则你的 setChecked() 可能会触发其他的 item 的 checkbox 的 setOnCheckedChangeListener()
holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
data.setIsChecked(isChecked);
}
});
holder.txtName.setText(data.getName());
// 根据当前界面是否是编辑模式决定是否显示复选框
if (mIsEditing) {
holder.checkBox.setVisibility(View.VISIBLE);
// 根据数据源的 isChecked 属性决定复选框是否是选中状态
holder.checkBox.setChecked(data.getIsChecked());
} else {
holder.checkBox.setVisibility(View.GONE);
}
return convertView;
}
class ViewHolder {
TextView txtName;
CheckBox checkBox;
}
}
}
/layout/activity_view_listview_listviewdemo10.xml
<?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="40dp"
android:orientation="horizontal">
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="显示复选框" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:text="隐藏复选框" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:text="全选" />
<Button
android:id="@+id/button4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone"
android:text="删除选中" />
</LinearLayout>
<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
/layout/item_view_listview_listviewdemo10.xml
<?xml version="1.0" encoding="utf-8"?>
<!--
注：
如果 ListView 的 item 中有 button 的话，默认情况下只能响应 button 的点击事件，而 item 的点击事件将被屏蔽
如果需要既响应 button 的点击事件，又响应 item 的点击事件的话，则需要将 item 的 descendantFocusability 设置为 blocksDescendants
-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:orientation="horizontal"
android:descendantFocusability="blocksDescendants">
<TextView
android:id="@+id/txtName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="@color/green"
android:textSize="24sp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:gravity="right">
<CheckBox
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>
