1

我试图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();
    }
}

但这些变化不会立即反映出来。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。谁能说如何解决这个问题？

注意：在 getView() 方法中，我还提到应该根据 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);
    }
}

主要活动

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，并在单击时将 EditText 中的文本设置为“”。

4

1 回答 1

0

您的视图管理存在一般性问题。
getView(...)每当列表需要视图来显示下一项时调用。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 加载的时候初始化的，但是在它的onClick(...)回调中类成员变量引用了 item2，因为getView()在点击事件触发之前被多次调用。getView(...)如果您希望您使用的视图都属于同一布局，您必须在范围内工作。

我注意到肯定会导致错误的另一件事是您对某些适配器方法的实现。具体来说

@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()肯定不应该返回一个位置。
getViewTypeCount()应该返回不同视图类型的计数，而不是getCount()返回的项目数。
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。然后正确重做您的适配器，您的所有问题也将消失。

请注意，这notifyDataSet()应该通知适配器有关datamodel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RadioButton根据您的数据模型设置启用/禁用。

于 2020-10-28T16:52:38.603 回答