为自定义适配器和 GridView 设置 RadioButton

Question

我有一个项目，我想在其中设置我的自定义View，而不是简单的Android GridView。 我做到了，现在我想为每一行设置RadioButton。 我看到了this

但我无法在此回复中指定布尔数组。 这是我的代码。 先Items Layout。

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:weightSum="1"
    android:layout_marginTop="30dp">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:text="Small Text"
        android:id="@+id/textView2"
        android:layout_x="12dp"
        android:layout_y="2dp"
        android:textColor="#000"/>
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:textAppearance="?android:attr/textAppearanceLarge"
        android:layout_marginLeft="20dp"
        android:id="@+id/textView"
        android:layout_x="157dp"
        android:layout_y="0dp"
        android:textColor="#000"/>
<RadioGroup
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/radiogroup"></RadioGroup>

    <RadioButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/radioButton"
        android:layout_x="302dp"
        android:layout_y="0dp"
        android:checked="false" />

</AbsoluteLayout>

还有简单的GridView 和Button。

<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:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".DisplayActivity">

<LinearLayout
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:weightSum="1"
    android:layout_marginTop="30dp">
    <GridView
        android:layout_width="wrap_content"
        android:layout_height="387dp"
        android:id="@+id/gridView"
        android:background="#abc"
        android:layoutDirection="ltr"
        android:choiceMode="singleChoice"/>
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Test"
        android:id="@+id/button" />
</LinearLayout>

在我的适配器类中：

import android.app.Activity;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.GridView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

import java.util.ArrayList;
import  android.widget.RadioButton;

public class CarAdapter extends ArrayAdapter<Car> {
    RadioButton radioButton;
    RadioGroup radioGroup;
    ArrayList<Boolean> booleans = new ArrayList<Boolean>();
public CarAdapter(Context context, int resource, ArrayList<Car> carArrayList, ArrayList<Boolean> mlist) {
    super(context, resource, carArrayList);
    this.booleans = mlist;
}
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Car car = getItem(position);
        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(R.layout.item_car, parent, false);
        }
        RadioGroup radioGroup = (RadioGroup)convertView.findViewById(R.id.radiogroup);
        radioButton = (RadioButton)convertView.findViewById(R.id.radioButton);
        TextView carName = (TextView) convertView.findViewById(R.id.textView2);
        TextView carSIM = (TextView) convertView.findViewById(R.id.textView);
        carName.setText(car.getName());
        carSIM.setText(car.getSIM());

        return convertView;

    }
    RadioButton.OnCheckedChangeListener mListener = new RadioButton.OnCheckedChangeListener() {

        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            booleans.set((Integer) buttonView.getTag(), isChecked); // get the tag so we know the row and store the status
        }
    };

}

我在getView 中试过这个方法：

    radioButton.setTag(Integer.valueOf(position));
    radioButton.setChecked(booleans.get(position));
    radioButton.setOnCheckedChangeListener(mListener);

而mListener 是：

    RadioButton.OnCheckedChangeListener mListener = new RadioButton.OnCheckedChangeListener() {

    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        booleans.set((Integer) buttonView.getTag(), isChecked); // get the tag so we know the row and store the status
    }
};

但它给了我

java.lang.IndexOutOfBoundsException at line `radioButton.setChecked(booleans.get(position));`

这里是Main Activity：

import android.app.Activity;
import android.media.Image;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AbsListView;
import android.widget.Button;
import android.widget.CheckedTextView;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.Toast;

import java.util.ArrayList;

public class DisplayActivity extends Activity {
    CarAdapter carAdapter;
    Car car;
    Car car2;
    ArrayList<Car> carArrayList;
    GridView gridView;
    Button test;
    ArrayList<Boolean> booleans;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_display);

        carArrayList = new ArrayList<Car>();
        car = new Car("Davie", "Smith");
        car2 = new Car("Enrique", "Wall");
        carArrayList.add(car);
        carArrayList.add(car2);
         booleans = new ArrayList<Boolean>(carArrayList.size());
        carAdapter = new CarAdapter(getApplicationContext(), android.R.layout.simple_list_item_checked, carArrayList, booleans);
        gridView = (GridView) findViewById(R.id.gridView);
        gridView.setAdapter(carAdapter);
        test = (Button) findViewById(R.id.button);


    test.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (gridView.isItemChecked(gridView.getCheckedItemPosition())) {
                String name = (carAdapter.getItem(gridView.getCheckedItemPosition())).getName();
                Toast.makeText(getApplicationContext(), "Here is " + name, Toast.LENGTH_SHORT).show();
            } else {
                Toast.makeText(getApplicationContext(), "This is not true", Toast.LENGTH_SHORT).show();
            }
        }
    });
    }
}

Answer 1

您将booleans ArrayList 分配给mlist ArrayList，它可以是空，因此您得到IndexOutOfBoundsException..您必须将mlist 分配给booleans ArrayList

mlist = this.booleans;

应该是..

this.booleans = mlist;

在您的 CarAdapter 构造函数中。

Answer 2

在你的 CarAdapter 中修改这个...

public CarAdapter(Context context, int resource, ArrayList<Car> carArrayList, ArrayList<Boolean> mlist) {
        super(context, resource, carArrayList);
        mlist = this.booleans;
    }

到

public CarAdapter(Context context, int resource, ArrayList<Car> carArrayList, ArrayList<Boolean> mlist) {
        super(context, resource, carArrayList);
        this.booleans= mlist ;
    }