Question

我使用CursorAdapter填充了自定义ListView的以下实现：

private class CurAdapter extends CursorAdapter{

        public CurAdapter(Context context, Cursor c, int flags) {

            super(context, c, flags);

        }

        @Override
        public void bindView(View view, Context context, Cursor cursor) {

            final ViewHolder holder = (ViewHolder) view.getTag();

            String name = (cursor.getString(cursor.getColumnIndexOrThrow("NotificationDateFor")));
            String image = cursor.getString(cursor.getColumnIndexOrThrow("imageUri"));



            holder.nametext.setText(name);
            setImage(image, holder.iv); 
            holder.chk.setOnClickListener(onchk);


        } 
        @Override
        public View newView(Context context, Cursor cursor, ViewGroup parent) {

            View view = LayoutInflater.from(context).inflate(R.layout.group_list, null);

            ViewHolder holder = new ViewHolder(view);
            view.setTag(holder);
            return view;

        }

        private View.OnClickListener onchk = new View.OnClickListener() {

            @Override
            public void onClick(View v) {


            }
        };


        public class ViewHolder {
            TextView nametext;
            RoundedImageView iv; 
            CheckBox chk; 

            public ViewHolder(View view){

                iv = (RoundedImageView)view.findViewById(R.id.imageView2);
                nametext = (TextView) view.findViewById(R.id.textView1);
                chk = (CheckBox) view.findViewById(R.id.checkBox1);

            }



        }

    }

我正在使用Holder模式以避免重复，但是在滚动列表时我随机检查了复选框，我在这里想念什么？

此外，我想知道如何在复选框的onClick中存储单击复选框的值。

Answer 1

只需创建一个Android项目并逐步执行此操作：

<强> activity_main.xml中

<?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" >

<Button
    android:id="@+id/button1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:onClick="showDialog"
    android:text="Click Here..." />

<TextView
    android:id="@+id/techView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceLarge" />

</LinearLayout>

<强> MainActivity.java

package com.example.multichoiceitem;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends Activity {

final String[] items = { ".NET", "J2EE", "PHP", "Android", "DBMS", "JAVA",
        "C", "C++" };
String[] itemstemp;
boolean[] selected = new boolean[items.length];
String selectedTech = "Selected Tech - ";

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    itemstemp = new String[items.length];
    itemstemp[0] = ".NET";
    itemstemp[1] = "Android";
    for (int i = 2; i < items.length; i++) {
        itemstemp[i] = "";
    }
    for (int i = 0; i < items.length; i++) {
        for (int j = 0; j < itemstemp.length; j++) {
            if (items[i].equals(itemstemp[j])) {
                selected[i] = true;
            }
        }
    }
}

public void showDialog(View v) {
    selectedTech = "";
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setTitle("Pick a Language");

    builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {

            for (int i = 0; i < items.length; i++) {
                if (selected[i]) {

                    selectedTech = selectedTech + items[i] + " ";
                    selected[i] = true;
                }
            }

            TextView tv = (TextView) findViewById(R.id.techView);
            tv.setText(selectedTech);
        }
    });

    builder.setMultiChoiceItems(items, selected,
            new DialogInterface.OnMultiChoiceClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int which,
                        boolean isChecked) {
                    selected[which] = isChecked;
                }
            });
    builder.show();
}
}

<强>清单：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.multichoiceitem"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
    android:minSdkVersion="14"
    android:targetSdkVersion="18" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name=".MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>

</manifest>

这是mulchoice项目，它包含复选框。如果你遇到任何问题，请运行代码问我。这是一个非常简单的过程..

Answer 2

你创建了一个类似的

List<Integer> positionList

和适配器getview方法

checbox.setCheckedChanged method in 
positionList.add(position);

和

for(Integer int:positionList){
if(int==position){
yourCheckBox.setChecked(true);

} }

Answer 3

我知道这个问题很老但这可能对某些人有帮助。如果您要延长SimpleCursorAdapter，您会注意到ListView项目内的文字视图不会重复。只有复选框。在适配器的类中，您需要：

private ArrayList<Boolean> checkBoxStates = new ArrayList<>();

在构造函数中，放置：

for(int i = 0; i < getCount(); i++) {
    checkBoxStates.add(i, false);
}

并覆盖getView()方法，如下所示：

public View getView(final int position, View convertView, ViewGroup parent) {
        View view = super.getView(position, convertView, parent);
        CheckBox checkBox = view.findViewById(R.id.checkbox);
        checkBox.setOnClickListener(new View.OnClickListener() {
            public void onClick(View v) {
                if(((CheckBox)v).isChecked()){
                    checkBoxStates.set(position, true);
                }else{
                    checkBoxStates.set(position, false);
                }
            }
        });
        checkBox.setChecked(checkBoxStates.get(position));
        return view;
}

复选框检查在列表视图中重复

3 个答案: