Question

我有一个ListView（如下所示），它有一个成分列表以及每个项目有多少成分。如何制作，以便在点击每种成分时有一些编辑数值的方法？

到目前为止，

上下文菜单和警告对话框，我还考虑了与项目匹配的按钮，但发现它没有使用无限列表视图。感谢任何帮助我的人！

Answer 1

如果要保存这些值，则可以创建子类并创建子类的列表。你可以使用onItemClickListner来更新对象中的值，然后在适配器上进行notifydatasetchange，这样做就可以了。

或

或者，您可以传递适配器中的两个列表并更新要更新的列表，并且不要进行更改。

例如： -

//MainActivity
public class MainActivity extends AppCompatActivity {

ListView recView;
ArrayList<Childclass> chobj=new ArrayList<>();

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

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

    chobj.add(new Childclass("Tomato sauce","0.0"));
    chobj.add(new Childclass("Chicken","0.0"));
    chobj.add(new Childclass("Olives","0.0"));

    ListAdapter lstadptr=new ListAdapter(MainActivity.this,chobj);
    recView.setAdapter(lstadptr);

    recView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, final int position, long id) {

            AlertDialog.Builder dialogBuilder = new AlertDialog.Builder(MainActivity.this);
            LayoutInflater inflater = MainActivity.this.getLayoutInflater();
            final View dialogView = inflater.inflate(R.layout.custom_dialog, null);
            dialogBuilder.setView(dialogView);

            final EditText edt = (EditText) dialogView.findViewById(R.id.edit1);

            dialogBuilder.setTitle("Custom dialog");
            dialogBuilder.setMessage("Enter text below");
            dialogBuilder.setPositiveButton("Add", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    //do something with edt.getText().toString();
                    chobj.get(position).setQuantity(edt.getText().toString());
                    ((ListAdapter) recView.getAdapter()).notifyDataSetChanged();
                }
            });
            dialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int whichButton) {
                    //pass
                }
            });
            AlertDialog b = dialogBuilder.create();
            b.show();

        }
    });

}}

儿童班

public class Childclass {

String name;
String quantity;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public String getQuantity() {
    return quantity;
}

public void setQuantity(String quantity) {
    this.quantity = quantity;
}

public Childclass(String name, String quantity) {

    this.name = name;
    this.quantity = quantity;
}}

ListAdapter

public class ListAdapter extends ArrayAdapter {

ArrayList<Childclass> chobj;
Context context;

public ListAdapter(@NonNull Context context,ArrayList<Childclass> chobj) {
    super(context, R.layout.recyclerow, chobj);
    this.context = context;
    this.chobj = chobj;
}

@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

    View v;
    LayoutInflater inflater = LayoutInflater.from(getContext());
    v = inflater.inflate(R.layout.recyclerow, parent, false);
    TextView tv= (TextView) v.findViewById(R.id.txtrow);
    TextView tv1= (TextView) v.findViewById(R.id.txtrow1);

    tv.setText(chobj.get(position).getName());
    tv1.setText(chobj.get(position).getQuantity());

    return v;
}}

活动主要

<LinearLayout 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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.abhishek.kotlinprojecttest.MainActivity">


<ListView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#f2f2f2"
    android:paddingTop="10dp"
    android:id="@+id/recView">

</ListView>

自定义提醒

<LinearLayout 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:padding="10dp"
android:orientation="vertical">

<EditText
    android:id="@+id/edit1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="text" />

列表行

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<android.support.v7.widget.CardView
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:layout_marginBottom="3dp"
    android:layout_marginTop="3dp"
    android:id="@+id/rowcd">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="listTExt"
        android:id="@+id/txtrow"
        android:textColor="#000000"
        android:textSize="16sp"
        android:gravity="center"/>
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="listTExt"
        android:id="@+id/txtrow1"
        android:textColor="#000000"
        android:textSize="16sp"
        android:gravity="center"/>

</android.support.v7.widget.CardView>

希望这会对你有所帮助

如何通过界面使ListView中的项目可编辑

1 个答案: