Question

我正在研究自学习机器人，现在正尝试用复选框创建列表视图。但是当我运行程序时，我确实看到带有复选框的列表视图，但是当我选择任何选项时，我看不到复选框中的检查。我在这里错过了什么吗？

MainActivity：

git revert

activity_main.xml中

package com.example.practisetutorials.myapplication;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.view.Menu;

public class MainActivity extends Activity {

    Context context;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        context = this;

        ListView listView = (ListView) findViewById(R.id.listView);

        String[] fruits = {"Banana", "Mango", "Apple", "Guava", "Orange", "Water Melon", "Grapes", "Cantaloupe", "Strawberry", "Blackberry", "Blueberry", "Papaya", "Pineapple"};

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.fruit_item, R.id.checkedTextView, fruits);
        listView.setAdapter(adapter);
        listView.setItemsCanFocus(false);
        listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    }
}

fruit_item.xml

<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="com.example.practisetutorials.myapplication.MainActivity">

    <ListView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/listView"
        android:layout_alignParentTop="true"
        android:layout_alignParentStart="true"/>
</RelativeLayout>

Answer 1

您缺少setOnItemClickListener

看看这里：http://windrealm.org/tutorials/android/listview-with-checkboxes.php

Answer 2

您是否尝试使用CheckedTextView？我通常只使用CheckBox。它开箱即用。以下是如何在不修改代码的情况下执行此操作：

MainActivity：

package com.example.test;
import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class MainActivity extends Activity {
    Context context;

@Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    context = this;

    ListView listView = (ListView) findViewById(R.id.listView);

    String[] fruits = {"Banana", "Mango", "Apple", "Guava", "Orange", "Water Melon", "Grapes", "Cantaloupe", "Strawberry", "Blackberry", "Blueberry", "Papaya", "Pineapple"};

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.fruit_item, R.id.checkedTextView, fruits);
    listView.setAdapter(adapter);
//        listView.setItemsCanFocus(false);
//        listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    }
}

然后是fruit_item.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" >
    <CheckBox
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text=""
        android:id="@+id/checkedTextView"
        android:gravity="center"
        android:checkMark="@color/accent_material_light"/>

</LinearLayout>

希望这有帮助！

Answer 3

如上所述，您在列表视图中缺少点击监听器。在onCreate的底部添加：

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            Toast.makeText(getApplicationContext(), "You tapped: " +fruits[position], Toast.LENGTH_SHORT).show();
        }
    });

并声明你的String []为final，这样你就可以在你的点击监听器中访问它。

Answer 4

尝试在listView.setChoiceMode（ListView.CHOICE_MODE_MULTIPLE）下面添加以下这些行;在onCreate（）方法中。

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            CheckedTextView checkedTextView = (CheckedTextView) view.findViewById(R.id.checkedTextView);
            if(checkedTextView.isChecked()) {
                checkedTextView.setChecked(false);
            } else {
                checkedTextView.setChecked(true);
            }
        }
    });

复选框未被点击

4 个答案: