使用列表视图中的复选框获取所选项目 [英] Get Selected Item Using Checkbox in Listview
本文介绍了使用列表视图中的复选框获取所选项目的处理方法，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
我正在创建一个Android应用程序，其中有一个ListView，该ListView显示了我的手机中安装的所有应用程序.
I am creating an Android application where I have a ListView that displays all of the applications that were installed in my mobile phone.
我的ListView是自定义的，它包含一个Icon，TextView和CheckBox，使用该图标是显示应用程序的图标，使用TextView是显示应用程序的名称，使用CheckBox来确定我在ListView中选择了什么项目.
My ListView is customized, it is contains a Icon, TextView and CheckBox, the use of the icon is to display the icon of the application, TextView is to display the name of the application, the use of the CheckBox is to determine what item in the ListView that I selected.
当我单击应用程序中的按钮时，如何确定在ListView行中选择的CheckBox是什么?我是Android的新手，所以我不知道应该怎么做.
How can I determine what is the CheckBox that I selected in the ListView rows when I click a button in my application? I'm new in Android so I don't know what is the approach that I should do.
这是我的代码:
public class AppInfo {
public Drawable icon;
public String applicationName;
public AppInfo(){
super();
}
public AppInfo(Drawable icon, String applicationName){
super();
this.icon = icon;
this.applicationName = applicationName;
}
}
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import android.app.Activity;
import android.widget.CheckBox;
public class AppInfoAdapter extends ArrayAdapter<AppInfo> {
Context context;
int layoutResourceId;
AppInfo data[] = null;
public AppInfoAdapter(Context context, int layoutResourceId, AppInfo[] 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;
AppInfoHolder holder= null;
if (row == null){
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new AppInfoHolder();
holder.imgIcon = (ImageView) row.findViewById(R.id.imgPackageIcon);
holder.txtTitle = (TextView) row.findViewById(R.id.txtApplicationName);
holder.chkSelect = (CheckBox) row.findViewById(R.id.chkSelect);
row.setTag(holder);
}
else{
holder = (AppInfoHolder)row.getTag();
}
AppInfo appinfo = data[position];
holder.txtTitle.setText(appinfo.applicationName);
holder.imgIcon.setImageDrawable(appinfo.icon);
holder.chkSelect.setChecked(true);
return row;
}
}
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.CheckBox;
public class AppInfoHolder {
ImageView imgIcon;
TextView txtTitle;
CheckBox chkSelect;
}
import android.app.Activity;
import android.content.pm.ApplicationInfo;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
import android.content.pm.PackageInfo;
public class CacheActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cache);
final ListView listApplication = (ListView)findViewById(R.id.listApplication);
ApplicationInfo applicationInfo = getApplicationInfo();
PackageManager pm = getPackageManager();
List<PackageInfo> pInfo = new ArrayList<PackageInfo>();
pInfo.addAll(pm.getInstalledPackages(0));
AppInfo app_info[] = new AppInfo[pInfo.size()];
int counter = 0;
for(PackageInfo item: pInfo){
try{
applicationInfo = pm.getApplicationInfo(item.packageName, 1);
app_info[counter] = new AppInfo(pm.getApplicationIcon(applicationInfo),
String.valueOf(pm.getApplicationLabel(applicationInfo)));
System.out.println(counter);
}
catch(Exception e){
System.out.println(e.getMessage());
}
counter++;
}
AppInfoAdapter adapter = new AppInfoAdapter(this, R.layout.listview_item_row, app_info);
listApplication.setAdapter(adapter);
}
}
推荐答案
假设您要获得的行项的单击按钮已选中.根据您的标题当我单击按钮时，使用Listview中的复选框获取所选项目"的假设.
Assuming you want to get items of row whose check boxes are checked at the click of a button. Assumption based on your title "Get Selected Item Using Checkbox in Listview when I click a Button".
尝试以下方法.仅进行如下更改.其余的保持不变.
Try the below. Make only changes as below. Keep the rest the same.
有关主题@
https://groups.google.com/forum/?fromgroups#！topic/android-developers/No0LrgJ6q2M
MainActivity.java
MainActivity.java
public class MainActivity extends Activity {
AppInfoAdapter adapter ;
AppInfo app_info[] ;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ListView listApplication = (ListView)findViewById(R.id.listApplication);
Button b= (Button) findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener()
{
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
StringBuilder result = new StringBuilder();
for(int i=0;i<adapter.mCheckStates.size();i++)
{
if(adapter.mCheckStates.get(i)==true)
{
result.append(app_info[i].applicationName);
result.append("\n");
}
}
Toast.makeText(MainActivity.this, result, 1000).show();
}
});
ApplicationInfo applicationInfo = getApplicationInfo();
PackageManager pm = getPackageManager();
List<PackageInfo> pInfo = new ArrayList<PackageInfo>();
pInfo.addAll(pm.getInstalledPackages(0));
app_info = new AppInfo[pInfo.size()];
int counter = 0;
for(PackageInfo item: pInfo){
try{
applicationInfo = pm.getApplicationInfo(item.packageName, 1);
app_info[counter] = new AppInfo(pm.getApplicationIcon(applicationInfo),
String.valueOf(pm.getApplicationLabel(applicationInfo)));
System.out.println(counter);
}
catch(Exception e){
System.out.println(e.getMessage());
}
counter++;
}
adapter = new AppInfoAdapter(this, R.layout.listview_item_row, app_info);
listApplication.setAdapter(adapter);
}
}
activity_main.xml ListView，按钮位于按钮上
activity_main.xml ListView with button at the buton
<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<ListView
android:layout_width="fill_parent"
android:id="@+id/listApplication"
android:layout_height="fill_parent"
android:layout_above="@+id/button1"
android:text="@string/hello_world" />
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:text="Button" />
</RelativeLayout>
AppInfoAdapter
AppInfoAdapter
public class AppInfoAdapter extends ArrayAdapter<AppInfo> implements CompoundButton.OnCheckedChangeListener
{ SparseBooleanArray mCheckStates;
Context context;
int layoutResourceId;
AppInfo data[] = null;
public AppInfoAdapter(Context context, int layoutResourceId, AppInfo[] data){
super(context, layoutResourceId,data);
this.layoutResourceId = layoutResourceId;
this.context = context;
this.data = data;
mCheckStates = new SparseBooleanArray(data.length);
}
@Override
public View getView(int position, View convertView, ViewGroup parent){
View row = convertView;
AppInfoHolder holder= null;
if (row == null){
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new AppInfoHolder();
holder.imgIcon = (ImageView) row.findViewById(R.id.imageView1);
holder.txtTitle = (TextView) row.findViewById(R.id.textView1);
holder.chkSelect = (CheckBox) row.findViewById(R.id.checkBox1);
row.setTag(holder);
}
else{
holder = (AppInfoHolder)row.getTag();
}
AppInfo appinfo = data[position];
holder.txtTitle.setText(appinfo.applicationName);
holder.imgIcon.setImageDrawable(appinfo.icon);
// holder.chkSelect.setChecked(true);
holder.chkSelect.setTag(position);
holder.chkSelect.setChecked(mCheckStates.get(position, false));
holder.chkSelect.setOnCheckedChangeListener(this);
return row;
}
public boolean isChecked(int position) {
return mCheckStates.get(position, false);
}
public void setChecked(int position, boolean isChecked) {
mCheckStates.put(position, isChecked);
}
public void toggle(int position) {
setChecked(position, !isChecked(position));
}
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
mCheckStates.put((Integer) buttonView.getTag(), isChecked);
}
static class AppInfoHolder
{
ImageView imgIcon;
TextView txtTitle;
CheckBox chkSelect;
}
}
这是快照
这篇关于使用列表视图中的复选框获取所选项目的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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