问题描述
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()
中使用了类似的方法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();
}
}
但是更改不会立即反映出来。当我单击按钮时,单选按钮未被选中。而是,有时未选中另一行中的单选按钮。但是,当我向下滚动并再次回到该位置时,我看到了更改。谁能说出解决这个问题的方法?
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 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);
}
}
MainActivity
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"};
else if (Month.month == 4 || Month.month == 6 || Month.month == 9 || Month.month == 11)
a = new String[] {"a","a"};
else {
if (Open.year % 4 == 0) {
a = new String[] {"a","a"};
}
else {
a = new String[] {"a","a"};
}
}
Mylistadapter adapter = new Mylistadapter(this,a);
listView = findViewById(R.id.listView);
listView.setAdapter(adapter);
}
}
以及在ListView中被夸大的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“”。
解决方法
您的视图管理存在一般性问题。
每当列表需要视图以显示下一项时,就会调用getView(...)
。这意味着,只能在此方法内访问此方法内使用的所有视图。但是您将它们存储在班级成员中。这导致一个项目的视图导致另一项目更改的行为。因为它是在加载item1时初始化的,但是在其onClick(...)
回调中,类成员变量引用了item2,因为getView()
在触发click事件之前被多次调用。如果要使用的视图全部属于同一布局,则必须在getView(...)
范围内进行工作。
我注意到肯定会导致错误的另一件事是您对某些Adapters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,然后相应地实现。getItemViewType()
当然不应该返回职位。getViewTypeCount()
应该返回不同视图类型的计数,而不是getCount()
返回的项目计数。getItem()
被覆盖并称其为self。因此getItem()
会陷入无限循环,直到线程由于堆栈溢出而崩溃。
这些都被错误地实施。我建议查找ArrayAdapter的文档,也许还需要一些示例实现。然后正确重做适配器,所有问题也将消失。
请注意,notifyDataSet()
应该将数据模型中的更改通知适配器。因此,仅当您实际更改数据时才调用它。更改RadioButton的checked- 状态不会操纵数据!
您应该将数据模型中的标志设置为true / false,然后将有关更改通知适配器。这将导致调用getView(...)
,然后根据数据模型将RadioButton
设置为启用/禁用。