如何以编程方式在自定义列表视图中进行更改以立即反映？

Question

我正在尝试在自定义列表视图中放置一个按钮，该按钮应重置该行中小部件的所有值（例如：取消选中所有单选按钮）。我在 getView()

中使用过类似的东西

btn.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick() {
        editor.putBoolean("rb1"+position,false).apply();
        editor.putBoolean("rb2"+position,false).apply();
        rb1.setChecked(false);
        rb2.setChecked(false);
        et.setText("");
        notifyDataSetChanged();
    }
}

但更改不会立即反映出来。当我单击按钮时，单选按钮不会取消选中。相反，有时会取消选中另一行中的单选按钮。但是当我向下滚动并再次回到那个地方时，我看到了变化。谁能说说这个问题怎么解决？

注意：在 getView() 方法中，我还提到应根据 SharedPreferences 值选中或取消选中单选按钮。

编辑

我正在编写完整的代码。

ArrayAdapter 类

import android.app.Activity;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;

public class MyListAdapter extends ArrayAdapter<String> {
    private final Activity activity;
    View rowView;
    TextView tv;
    RadioGroup rg;
    RadioButton rb1, rb2;
    EditText etQty;
    ImageView imageView;
    public MyListAdapter(Activity activity, String[] a) {
        super(activity, R.layout.activity_row, a);
        this.activity = activity;
    }
    public View getView(final int position, final View convertView, ViewGroup parent) {
        LayoutInflater inflater = activity.getLayoutInflater();
        if(convertView == null)
            rowView = inflater.inflate(R.layout.activity_row, parent, false);
        else
            rowView = convertView;
        tv = rowView.findViewById(R.id.textView);
        rg = rowView.findViewById(R.id.radioGroup);
        rb1 = rowView.findViewById(R.id.rbFB);
        rb2 = rowView.findViewById(R.id.rbCB);
        etQty = rowView.findViewById(R.id.etQty);
        imageView = rowView.findViewById(R.id.imageView);
        imageView.setClickable(true);
        rb1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                notifyDataSetChanged();
                Month.editor.putInt(Worker.name + Open.year + Month.month + (position+1) + "item",1).apply();
            }
        });
        rb2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                notifyDataSetChanged();
                Month.editor.putInt(Worker.name + Open.year + Month.month + (position+1) + "item",2).apply();
            }
        });
        imageView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Month.editor.putInt(Worker.name + Open.year + Month.month + (position+1) + "item",0).apply();
                Month.editor.putInt(Worker.name + Open.year + Month.month + (position+1) + "dz",0).apply();
                rb1.setChecked(false);
                rb2.setChecked(false);
                etQty.setText("");
                notifyDataSetChanged();
            }
        });
        etQty.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

            }

            @Override
            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                if (!charSequence.toString().equals("")) {
                    Month.editor.putInt(Worker.name + Open.year + Month.month + (position + 1) + "dz", Integer.parseInt(charSequence.toString())).apply();
                }
            }

            @Override
            public void afterTextChanged(Editable editable) {

            }
        });
        tv.setText((position+1)+"/"+Month.month+"/"+"20"+Open.year);
        if (Month.settings.getInt(Worker.name + Open.year + Month.month + (position+1) + "item",0) == 1) {
            rb1.setChecked(true);
            notifyDataSetChanged();
        }
        else if (Month.settings.getInt(Worker.name + Open.year + Month.month + (position+1) + "item",0) == 2) {
            rb2.setChecked(true);
            notifyDataSetChanged();
        }
        if (Month.settings.getInt(Worker.name + Open.year + Month.month + (position+1) + "dz",0) != 0) {
            etQty.setText(Integer.toString(Month.settings.getInt(Worker.name + Open.year + Month.month + (position + 1) + "dz", 0)));
            notifyDataSetChanged();
        }
        return rowView;
    }
    @Override
    public int getViewTypeCount() {
        return getCount();
    }
    @Override
    public int getItemViewType(int position) {
        return position;
    }
    @Override
    public String getItem(int position) {
        return getItem(position);
    }
}

主活动

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.ListView;

public class MainActivity extends AppCompatActivity {
    ListView listView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        String[] a;
        if (Month.month == 1 || Month.month == 3 || Month.month == 5 || Month.month == 7 || Month.month == 8 || Month.month == 10 || Month.month == 12)
            a = new String[] {"a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a"};
        else if (Month.month == 4 || Month.month == 6 || Month.month == 9 || Month.month == 11)
            a = new String[] {"a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a"};
        else {
            if (Open.year % 4 == 0) {
                a = new String[] {"a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a"};
            }
            else {
                a = new String[] {"a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a","a"};
            }
        }
        MyListAdapter adapter = new MyListAdapter(this,a);
        listView = findViewById(R.id.listView);
        listView.setAdapter(adapter);
    }
}

以及在 ListView 中膨胀的 Layout

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="40dp"
        android:layout_height="40dp"
        app:layout_constraintBottom_toBottomOf="@+id/etQty"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.348"
        app:layout_constraintStart_toEndOf="@+id/etQty"
        app:layout_constraintTop_toTopOf="@+id/etQty"
        app:layout_constraintVertical_bias="0.0"
        app:srcCompat="@drawable/delete" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="110dp"
        android:layout_height="40dp"
        android:textSize="20sp"
        android:gravity="center"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.053"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.46" />

    <RadioGroup
        android:id="@+id/radioGroup"
        android:layout_width="130dp"
        android:layout_height="40dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toBottomOf="@+id/textView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.074"
        app:layout_constraintStart_toEndOf="@+id/textView"
        app:layout_constraintTop_toTopOf="@+id/textView"
        app:layout_constraintVertical_bias="0.0">

        <RadioButton
            android:id="@+id/rbFB"
            android:layout_width="60dp"
            android:layout_height="40dp"
            android:text="FB"
            android:textSize="20sp" />

        <RadioButton
            android:id="@+id/rbCB"
            android:layout_width="60dp"
            android:layout_height="40dp"
            android:layout_marginStart="10dp"
            android:text="CB"
            android:textSize="20sp" />
    </RadioGroup>

    <EditText
        android:id="@+id/etQty"
        android:layout_width="50dp"
        android:layout_height="40dp"
        android:ems="10"
        android:inputType="phone"
        android:textSize="20sp"
        android:textAlignment="center"
        android:textStyle="bold"
        app:layout_constraintBottom_toBottomOf="@+id/radioGroup"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.118"
        app:layout_constraintStart_toEndOf="@+id/radioGroup"
        app:layout_constraintTop_toTopOf="@+id/radioGroup"
        app:layout_constraintVertical_bias="0.0" />


</androidx.constraintlayout.widget.ConstraintLayout>

ImageView 的目的是取消选中所有单选按钮，并在点击时将 EditText 中的文本设置为“”。

Answer 1

您的视图管理存在一般问题。
每当列表需要视图以显示下一项时，都会调用getView(...)。这意味着，此方法中使用的所有视图都只能在此方法中访问。但是您将它们存储在班级成员中。这会导致一个项目的视图导致另一项目更改的行为。因为它是在 item1 加载时初始化的，但是在它的onClick(...) 回调中类成员变量引用了 item2，因为在触发点击事件之前，getView() 被多次调用。如果您希望您使用的视图都属于同一布局，则必须在 getView(...) 的范围内工作。

我注意到的另一件肯定会导致错误的事情是您对某些适配器方法的实现。具体

@Override
public int getViewTypeCount() {
    return getCount();
}
@Override
public int getItemViewType(int position) {
    return position;
}
@Override
public String getItem(int position) {
    return getItem(position);
}

阅读他们的文档，然后相应地实施它们。
getItemViewType() 肯定不应该返回位置。
getViewTypeCount() 应该返回不同视图类型的计数，而不是计数getCount() 返回的项目。
getItem() 被覆盖并调用它自己。所以getItem() 会陷入无限循环，直到线程由于堆栈溢出而崩溃。
这些都被错误地执行了。我建议查找 ArrayAdapter 的文档，也许还有一些示例实现。然后正确地重做您的适配器，您的所有问题也会消失。

请注意，notifyDataSet() 应该通知适配器 datamodel 中的更改。因此，只有在您实际更改数据时才调用它。更改 RadioButton 的选中状态-不是在操作数据！
您应该将数据模型中的标志设置为 true/false，然后将更改通知适配器。这将导致 getView(...) 被调用，然后根据您的数据模型设置 RadioButton 启用/禁用。