列表视图中已安装应用程序的复选框问题 [英] checkbox issue in installed app in listview
本文介绍了列表视图中已安装应用程序的复选框问题的处理方法，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
但我的问题没有得到解决。我知道这个问题有很多问题，但我的问题是
我有4
A，B，C，D类
从A类转到B类，其中listview中列出了所有已安装的应用程序。在B类中我发送Packagelist到类c（BaseAdapter类），然后哪个应用程序用户选择将传递到A类。
所以我的问题是在哪里或如何使用POJO类将安装的应用程序传递给baseadapter类，然后如何获得所有检查的值（字符串应用程序名称），并将其传递给类A.
，以及我如何维护复选框的检查状态。 p>
任何帮助plz。
自定义适配器类
import java.util.List;
import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.Toast;
public class AppListAdapter extends BaseAdapter {
List< PackageInfo> packageList;
活动上下文;
PackageManager packageManager;
boolean [] itemChecked;
int checkBoxCounter = 0;
int checkBoxInitialized = 0;
public AppListAdapter（Activity context，List< PackageInfo> packageList，
PackageManager packageManager）{
super（）;
this.context = context;
this.packageList = packageList;
this.packageManager = packageManager;
itemChecked = new boolean [packageList.size（）];
}
私人类ViewHolder {
TextView apkName;
CheckBox ck1;
}
public int getCount（）{
return packageList.size（）;
}
public Object getItem（int position）{
return packageList.get（position）;
}
public long getItemId（int position）{
return 0;
}
@Override
public View getView（final int position，View convertView，ViewGroup parent）{
// final ViewHolder holder;
checkBoxCounter = 0;
checkBoxInitialized = 0;
LayoutInflater inflater = context.getLayoutInflater（）;
if（convertView == null）{
convertView = inflater.inflate（R.layout.apklist_item，null）;
final ViewHolder holder = new ViewHolder（）;
holder.apkName =（TextView）convertView
.findViewById（R.id.ApkList_tvappname）;
holder.ck1 =（CheckBox）convertView
.findViewById（R.id.ApkList_checkBox）;
holder.ck1
.setOnCheckedChangeListener（new CompoundButton.OnCheckedChangeListener（）{
@Override
public void onCheckedChanged（CompoundButton buttonView，
boolean isChecked）{
AppsSelected element =（AppsSelected）holder.ck1
.getTag（）;
element.setSelected（buttonView.isChecked（））;
if（checkBoxCounter <= checkBoxInitialized）{
//递增计数器，当我们滚动列表它
//执行onCheckedChanged每次所以
//使用这个东西我们可以维护状态
checkBoxCounter ++;
} else {
element =（AppsSelected）holder.ck1.getTag（）;
element.setSelected（buttonView.isChecked（））;
if（element.isSelected（））
Toast.makeText（
context，
You selected+ element.getName（），
Toast .LENGTH_LONG）.show（）;
else
Toast.makeText（
context，
未选择+ element.getName（），
Toast.LENGTH_LONG）.show
}
}
}）;
convertView.setTag（holder）;
holder.ck1.setTag（packageList.get（position））;
} else {
（（ViewHolder）convertView.getTag（））ck1.setTag（packageList.get（position））;
}
ViewHolder holder =（ViewHolder）convertView.getTag（）;
PackageInfo packageInfo =（PackageInfo）getItem（position）;
可绘制的appIcon = packageManager
.getApplicationIcon（packageInfo.applicationInfo）;
String appName = packageManager.getApplicationLabel（
packageInfo.applicationInfo）.toString（）;
appIcon.setBounds（0，0，40，40）;
holder.apkName.setCompoundDrawables（appIcon，null，null，null）;
holder.apkName.setCompoundDrawablePadding（15）;
holder.apkName.setText（appName）;
return convertView;
}
}
解决方案
你可以参考我的答案在这里，你可以做的是，存储复选框状态在布尔数组，那么你不会面对这个问题.....
I refered to these links link , link , link , link
but my problem is not getting solved. i know there are many question regarding this issue but my problem is
i have 4 class A,B,C,D
From class A i goto Class B where all installed apps listed in listview. in Class B i send Packagelist to Class c (BaseAdapter class) and then which apps user have selected will pass to Class A.
So my problem is where or how can i use POJO class to pass installed Apps to baseadapter class and then how i can get all checked value(string app name) and pass it to the Class A. and also how i can maintain checked status of check box.
any help plz.
custom Adapter class
import java.util.List;
import android.app.Activity;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.graphics.drawable.Drawable;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import android.widget.Toast;
public class AppListAdapter extends BaseAdapter {
List<PackageInfo> packageList;
Activity context;
PackageManager packageManager;
boolean[] itemChecked;
int checkBoxCounter = 0;
int checkBoxInitialized = 0;
public AppListAdapter(Activity context, List<PackageInfo> packageList,
PackageManager packageManager) {
super();
this.context = context;
this.packageList = packageList;
this.packageManager = packageManager;
itemChecked = new boolean[packageList.size()];
}
private class ViewHolder {
TextView apkName;
CheckBox ck1;
}
public int getCount() {
return packageList.size();
}
public Object getItem(int position) {
return packageList.get(position);
}
public long getItemId(int position) {
return 0;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// final ViewHolder holder;
checkBoxCounter = 0;
checkBoxInitialized = 0;
LayoutInflater inflater = context.getLayoutInflater();
if (convertView == null) {
convertView = inflater.inflate(R.layout.apklist_item, null);
final ViewHolder holder = new ViewHolder();
holder.apkName = (TextView) convertView
.findViewById(R.id.ApkList_tvappname);
holder.ck1 = (CheckBox) convertView
.findViewById(R.id.ApkList_checkBox);
holder.ck1
.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
AppsSelected element = (AppsSelected) holder.ck1
.getTag();
element.setSelected(buttonView.isChecked());
if (checkBoxCounter <= checkBoxInitialized) {
// increment counter, when we scroll the List it
// execute onCheckedChanged everytime so by
// using this stuff we can maintain the state
checkBoxCounter++;
} else {
element = (AppsSelected) holder.ck1.getTag();
element.setSelected(buttonView.isChecked());
if (element.isSelected())
Toast.makeText(
context,
"You selected " + element.getName(),
Toast.LENGTH_LONG).show();
else
Toast.makeText(
context,
"Not selected " + element.getName(),
Toast.LENGTH_LONG).show();
}
}
});
convertView.setTag(holder);
holder.ck1.setTag(packageList.get(position));
} else {
((ViewHolder) convertView.getTag()).ck1.setTag(packageList.get(position));
}
ViewHolder holder = (ViewHolder) convertView.getTag();
PackageInfo packageInfo = (PackageInfo) getItem(position);
Drawable appIcon = packageManager
.getApplicationIcon(packageInfo.applicationInfo);
String appName = packageManager.getApplicationLabel(
packageInfo.applicationInfo).toString();
appIcon.setBounds(0, 0, 40, 40);
holder.apkName.setCompoundDrawables(appIcon, null, null, null);
holder.apkName.setCompoundDrawablePadding(15);
holder.apkName.setText(appName);
return convertView;
}
}
解决方案
You can refer to my answer here, what you can do is,store check box state in a boolean array then you wont face this issue.....
Android checkbox multiselected issue
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