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android – listview中的复选框无法正常工作（androidstudio复选框案例）

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在本文中，我们将为您详细介绍android–listview中的复选框无法正常工作的相关知识，并且为您解答关于androidstudio复选框案例的疑问，此外，我们还会提供一些关于AndroidExp

在本文中，我们将为您详细介绍android – listview中的复选框无法正常工作的相关知识，并且为您解答关于androidstudio复选框案例的疑问，此外，我们还会提供一些关于Android ExpandableListView和onChildClick无法正常工作、Android Listview 删除复选框 Kotlin、Android MapView无法正常工作、android – hierarchyviewer无法正常工作的有用信息。

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android – listview中的复选框无法正常工作（androidstudio复选框案例）

android – listview中的复选框无法正常工作（androidstudio复选框案例）

我正在为listview的每个Iten实现带有listview的复选框.我得到的问题是当我点击任何单个复选框时,当我滚动时,其他一些未被点击的复选框也随机点击.我在SO上经历了许多链接,但它没有解决我的问题.

public class CustomListViewAdapter extends ArrayAdapter<Client> {

ViewHolder holder = null;
private LayoutInflater inflator = null;
private ArrayList<Client> orderList = null;
ArrayList<View> allViews;

public CustomListViewAdapter(Context context, int resource,
        List<Client> objects) {
    super(context, resource, objects);

    orderList = (ArrayList<Client>) objects;
    inflator = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    allViews = new ArrayList<View>();
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if(convertView == null) {
        convertView = inflator.inflate(R.layout.listview_add_order, null);
        holder = new ViewHolder();
        convertView.setTag(holder);
        holder.txtViewName = (TextView) convertView.findViewById(R.id.txtViewAddOrder);
        holder.spinnerAddorder = (Spinner) convertView.findViewById(R.id.spinnerAddOrder);
        holder.checkAddorder = (CheckBox) convertView.findViewById(R.id.checkAddOrder);
        holder.checkAddorder.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();


        holder.checkAddorder.setTag(holder);
    }

    allViews.add(position, holder.spinnerAddorder);

    holder.checkAddorder.setonClickListener(new OnClickListener() {

        @Override
        public void onClick(View view) {
            CheckBox cchk = (CheckBox)view;
            ViewHolder checkPosition = (ViewHolder) view.getTag();


            if(cchk.isChecked()) {

                checkPosition.spinnerAddorder.setVisibility(View.VISIBLE);

            } else {
                checkPosition.spinnerAddorder.setVisibility(View.INVISIBLE);
            }
        }
    });

    List<String> list = new ArrayList<String>();
    list.add("Select Quantity");
    list.add("1");
    list.add("2");
    list.add("3");
    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this.getContext(),R.layout.spinner_add_order_style, list);
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
    holder.spinnerAddorder.setAdapter(dataAdapter);

    if(holder.checkAddorder.isChecked()) {


        ViewHolder checkPosition = (ViewHolder) holder.checkAddorder.getTag();
        checkPosition.spinnerAddorder.setVisibility(View.VISIBLE);
    } else {

        ViewHolder checkPosition = (ViewHolder) holder.checkAddorder.getTag();
        checkPosition.spinnerAddorder.setVisibility(View.INVISIBLE);
    }


    Client order = orderList.get(position);

    holder.txtViewName.setText(order.getFirstName());
    return  convertView;
}

private static class ViewHolder {
    public TextView txtViewName = null;
    public Spinner spinnerAddorder = null;
    public CheckBox checkAddorder = null;
}

     }

我的xml文件是

<?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="wrap_content"
android:gravity="center_vertical"
android:orientation="horizontal"
android:paddingLeft="5dp"
android:paddingRight="5dp"
android:weightSum="2" >

<TextView
    android:id="@+id/txtViewAddOrder"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    android:layout_weight="1.2"
    android:text="TextView"
    android:textSize="25sp" />

<Spinner
    android:id="@+id/spinnerAddOrder"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_weight=".8"
    android:background="@drawable/dropdown" />

<CheckBox
    android:id="@+id/checkAddOrder"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="20dp" />

 </LinearLayout>

解决方法:

这是因为视图回收而发生的.你需要做的是维护一个假布尔数组,每次选中一个复选框切换相应的布尔值.然后在你的getview中检查相应的布尔数组位置并设置复选框的状态.

沿着这些方向：我修改了它,以便正确显示.没有检查你的其余代码是什么. ^ _ ^

public class CustomListViewAdapter extends ArrayAdapter<Client> {

ViewHolder holder = null;
private LayoutInflater inflator = null;
private ArrayList<Client> orderList = null;
ArrayList<View> allViews;

boolean[] checkedStates; //********** NEW ********

public CustomListViewAdapter(Context context, int resource,
        List<Client> objects) {
    super(context, resource, objects);

    orderList = (ArrayList<Client>) objects;
    inflator = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    allViews = new ArrayList<View>();

    checkedStates = new boolean[objects.size()]; //********** NEW ********
}

@Override   //********** NEW ******** position argument is Now final 
public View getView(final int position, View convertView, ViewGroup parent) {
    if(convertView == null) {
        convertView = inflator.inflate(R.layout.listview_add_order, null);
        holder = new ViewHolder();
        convertView.setTag(holder);
        holder.txtViewName = (TextView) convertView.findViewById(R.id.txtViewAddOrder);
        holder.spinnerAddorder = (Spinner) convertView.findViewById(R.id.spinnerAddOrder);
        holder.checkAddorder = (CheckBox) convertView.findViewById(R.id.checkAddOrder);
        holder.checkAddorder.setTag(holder);
    } else {
        holder = (ViewHolder) convertView.getTag();


        holder.checkAddorder.setTag(holder);
    }

    allViews.add(position, holder.spinnerAddorder);

    holder.checkAddorder.setonClickListener(new OnClickListener() {

        @Override
        public void onClick(View view) {

              checkedStates[position] = !checkedStates[position]; //********** NEW ********
        }
    });

    holder.chechAddorder.setChecked(checkedStates[position]); //********** NEW ********

    List<String> list = new ArrayList<String>();
    list.add("Select Quantity");
    list.add("1");
    list.add("2");
    list.add("3");
    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this.getContext(),R.layout.spinner_add_order_style, list);
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
    holder.spinnerAddorder.setAdapter(dataAdapter);

    if(checkedStates[position]) { //********** NEWEST ******** assuming true is checked and false is unchecked


        ViewHolder checkPosition = (ViewHolder) holder.checkAddorder.getTag();
        checkPosition.spinnerAddorder.setVisibility(View.VISIBLE);
    } else {

        ViewHolder checkPosition = (ViewHolder) holder.checkAddorder.getTag();
        checkPosition.spinnerAddorder.setVisibility(View.INVISIBLE);
    }


    Client order = orderList.get(position);

    holder.txtViewName.setText(order.getFirstName());
    return  convertView;
}

private static class ViewHolder {
    public TextView txtViewName = null;
    public Spinner spinnerAddorder = null;
    public CheckBox checkAddorder = null;
}

     }

Android ExpandableListView和onChildClick无法正常工作

Android ExpandableListView和onChildClick无法正常工作

我一直在阅读很多与我有同样问题的线程,但我无法弄清楚发生了什么.我有一个可扩展的列表视图,但我无法使onChildClickListener工作. onGroupClickListener工作正常,但我真的不需要它.我看了很多例子,他们似乎都像我一样.这是代码：

import android.app.Activity;
import android.app.ExpandableListActivity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnChildClickListener;
import android.widget.ExpandableListView.OnGroupClickListener;
import android.widget.ListView;
import android.widget.Toast;

import org.ektorp.CouchDbConnector;
import org.ektorp.dbaccessException;
import org.ektorp.android.util.EktorpAsyncTask;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;



import android.widget.TextView;



public class MainActivity extends Activity {
 super.onCreate(savedInstanceState);

 setContentView(R.layout.activity_main);

 EktorpAsyncTask getUsersTask = new EktorpAsyncTask() {


            @Override
            protected void doInBackground() {
                //here i connect to de BD and fill the Group and Children arrays                
            }


@Override
                protected void onSuccess() {

                UserArrayExpandableAdapter adapter = new UserArrayExpandableAdapter(getApplicationContext(),parentsChilds.getParents(), parentsChilds.getChilds());
ExpandableListView expandableList = (ExpandableListView) findViewById(R.id.userview);
                expandableList.setAdapter(adapter);
                expandableList.setClickable(true);

                expandableList.setonGroupClickListener(new OnGroupClickListener(){
                     @Override
                        public boolean onGroupClick(ExpandableListView arg0, View arg1,
                            int groupPosition, long arg3) {
                            return false;
                            }
                });

                expandableList.setonChildClickListener(new OnChildClickListener()
                  {
                      @Override
                      public boolean onChildClick(ExpandableListView arg0, View arg1, int arg2, int arg3, long arg4)
                      {
                          Toast.makeText(getBaseContext(), "Child clicked", Toast.LENGTH_LONG).show();
                          return false;
                      }
                  });

儿童观：

<?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:layout_marginTop="10dp"
android:orientation="vertical" 
android:clickable="true"
android:focusable="true">


<TextView
    android:id="@+id/day"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/DarkSeaGreen"
    android:paddingLeft="8dp"
    android:paddingBottom="4dp"
    android:textColor="@color/White"
    android:textSize="18sp"
    android:text/>

<RelativeLayout
    android:layout_width="fill_parent"
    android:layout_height="?android:attr/listPreferredItemHeight"
    android:padding="6dip" 
    android:clickable="true"
    android:focusable="true">

    <TextView
        android:id="@+id/subject"
        android:layout_width="fill_parent"
        android:layout_height="26dip"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:ellipsize="marquee"
        android:singleLine="true"
        android:textSize="12sp" />

    <TextView
        android:id="@+id/name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_alignWithParentIfMissing="true"
        android:gravity="center_vertical"
        android:textandroid:textSize="16sp" />
</RelativeLayout>

</LinearLayout>

小组布局：

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:paddingBottom="5dp" >

<TextView
    android:id="@+id/monthText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:textSize="26sp"
    android:background="@color/SkyBlue"
    android:textColor="@color/White"
    android:text/>

</LinearLayout>

MainActivity布局：

<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=".LoginActivity" >

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <ExpandableListView
        android:id="@+id/userview"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
    </ExpandableListView>



</RelativeLayout>

适配器代码：

public class UserArrayExpandableAdapter extends Baseexpandablelistadapter {
private final Context context;
private final ArrayList<ArrayList<EventVO>> childs;
private ArrayList<String> parents;

public UserArrayExpandableAdapter(Context context, ArrayList<String> parents,ArrayList<ArrayList<EventVO>> childs) {
    this.context = context;
    this.childs = childs;
    this.parents = parents;
}

@Override
public Object getChild(int arg0, int arg1) {
    return childs.get(arg0).get(arg1);
}

@Override
public long getChildId(int groupPosition, int childPosition) {
    return childPosition;
}

@Override
public View getChildView(int groupPosition, int childPosition,
        boolean isLastChild, View convertView, ViewGroup parent) {
    List<EventVO> child = (ArrayList<EventVO>) childs.get(groupPosition);


    if (convertView == null){
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
       convertView = inflater.inflate(R.layout.user_view, parent, false);
    }
    TextView nameView = (TextView) convertView.findViewById(R.id.name);
    TextView dateView = (TextView) convertView.findViewById(R.id.day);
    TextView subjectView = (TextView) convertView.findViewById(R.id.subject);
    nameView.setText(child.get(childPosition).getName());
    String day = child.get(childPosition).getDate();
    day = DateTransformer.getDay(day);
    dateView.setText(day);
    subjectView.setText(child.get(childPosition).getSubject());
        return convertView;
}

@Override
public int getChildrenCount(int groupPosition) {
    return childs.get(groupPosition).size();
}

@Override
public Object getGroup(int groupPosition) {
    return parents.get(groupPosition);
}

@Override
public int getGroupCount() {
    return parents.size();
}

@Override
public long getGroupId(int groupPosition) {
    return groupPosition;
}

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {

    if (convertView==null) {
        LayoutInflater inflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
       convertView = inflater.inflate(R.layout.parent_view, parent, false); 
    }
    TextView monthView = (TextView) convertView.findViewById(R.id.monthText);
    monthView.setText(parents.get(groupPosition));
    return convertView;
}

@Override
public boolean hasstableIds() {
    return true;
}

@Override
public boolean isChildSelectable(int groupPosition, int childPosition) {
    return true;
}


}

非常感谢你.

解决方法:

我有同样的问题.我的ExpandableListView的孩子有两个ImageView和一个TextView.在布局文件中将属性TextView：focusable设置为“false”解决了这个问题.
奇怪的是,相同的代码(没有设置focusable属性)在API8中运行良好,但是当在API16模拟器上执行时,孩子们没有响应click.

Android Listview 删除复选框 Kotlin

Android Listview 删除复选框 Kotlin

所以我从问题中了解到，每当用户检查一个项目然后单击删除时，您都希望从列表中删除该检查项目并相应地在 listView 中更新 UI。通常，当您想要删除该项目时，您必须将其从 mainAdapter 的列表中删除。类似的东西

mainAdapter.remove(checked)

并且在 mainAdapter 中定义了一个方法，该方法从其列表中删除该位置的项目，例如

fun remove(position: Int){
    playList.remove(position)
    notifyDataSetChanged()
    notifyItemRangeChanged(0,playList.size)
}

对不起，如果我误解了这个问题..

Android MapView无法正常工作

Android MapView无法正常工作

Logcat输出：

[2010-01-09 15:47:19 - HelloMapView]------------------------------
[2010-01-09 15:47:19 - HelloMapView]Android Launch!
[2010-01-09 15:47:19 - HelloMapView]adb is running normally.
[2010-01-09 15:47:19 - HelloMapView]Performing org.example.hellomapview.HelloMapView activity launch
[2010-01-09 15:47:19 - HelloMapView]Failed to find an AVD compatible with target 'Google Apis'.
[2010-01-09 15:47:21 - HelloMapView]Performing org.example.hellomapview.HelloMapView activity launch
[2010-01-09 15:47:22 - HelloMapView]Application already deployed. No need to reinstall.
[2010-01-09 15:47:22 - HelloMapView]Starting activity org.example.hellomapview.HelloMapView on device 
[2010-01-09 15:47:23 - HelloMapView]ActivityManager: Can't dispatch DDM chunk 46454154: no handler defined
[2010-01-09 15:47:23 - HelloMapView]ActivityManager: Can't dispatch DDM chunk 4d505251: no handler defined
[2010-01-09 15:47:23 - HelloMapView]ActivityManager: Starting: Intent { comp={org.example.hellomapview/org.example.hellomapview.HelloMapView} }

当我运行我的应用程序时,它显示上述错误.我无法运行我在myMap应用程序中使用的相同代码.请帮我.

解决方法:

日志消息“无法找到与目标’Google Api’兼容的AVD”说明了一切.

您需要create an emulator,其中包括Google Api(因此包括Google Maps库).

有一个GUI,可让您管理和创建新的仿真器映像.只需从SDK工具文件夹运行android.

android – hierarchyviewer无法正常工作

android – hierarchyviewer无法正常工作

当我运行hierarchyviewer时,我收到警告

SWT文件夹’/home/sharanu/work/android-ics-source/prebuilt/linux-x86_64/swt/swt.jar’不存在.
请导出ANDROID_SWT以指向包含适用于您的平台的swt.jar的文件夹.

然后我尝试设置ANDROID_SWT仍然是相同的错误.但早期的hierarchyviewer工作得很好.我不知道为什么现在不行.

请参阅图片.

解决方法

我刚从〜/ .bashrc中删除了ANDROID_SWT变量,它运行正常

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