java - 如何使用 setMultiChoiceItems 等复选框列表创建自定义对话框，接收和发送数据？

Question

我需要使用类似 setMultiChoiceItems 样式的对话框但包含更多信息，所以我使用自定义布局。

我的布局包含一个图像字段、另一个标题字段、另一个描述字段和另一个来自复选框的字段。

我已经设法让它像这样工作了:

我知道我需要使用 setAdapter 而不是 setMultiChoiceItems。到目前为止一切顺利。

我的问题是如何打开已经选择了一些选项的对话框？稍后接收所有选定的项目以发送到服务器？

使用 setMultiChoiceItems 我可以让它像这样工作:

但我似乎无法使用自定义布局。

这是我的代码:

##### ArrayList - ALItensValues #####

public class ALItensValues {
    private int icon;
    private String value;
    private String titulo;
    private String descricao;

    public ALItensValues(int icon, String value, String titulo, String descricao) {
        this.icon = icon;
        this.value = value;
        this.titulo = titulo;
        this.descricao = descricao;
    }

    int getIcon() { return icon; }
    String getValue() { return value; }
    String getTitulo() { return titulo; }
    String getDescricao() { return descricao; }
}

##### 适配器 - ALItensValuesAdapter #####

private class ALItensValuesAdapter extends BaseAdapter {

    private ArrayList<ALItensValues> mData;
    private Context mContext;

    ALItensValuesAdapter(ArrayList<ALItensValues> aldata, Context context) {
        this.mData = aldata;
        this.mContext = context;
    }

    @Override
    public int getCount() {
        return mData.size();
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            LayoutInflater mInflater = (LayoutInflater) mContext.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
            convertView = Objects.requireNonNull(mInflater).inflate(R.layout.multipleselectcustom_lines, null);
        }

        ImageView icon = convertView.findViewById(R.id.imgvicon);
        icon.setImageResource(mData.get(position).getIcon());
        TextView titulo = convertView.findViewById(R.id.txtv_titulo);
        titulo.setText(mData.get(position).getTitulo());
        TextView decricao = convertView.findViewById(R.id.txtv_desc);
        decricao.setText(mData.get(position).getDescricao());
        CheckBox checkbox = convertView.findViewById(R.id.chkbox);

        convertView.setOnClickListener(v -> {
            checkbox.toggle();
        });

        return convertView;
    }
}

#### Layout Itens - R.layout.multipleselectcustom_lines ####

<?xml version="1.0" encoding="utf-8"?>
<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="wrap_content" android:gravity="center">

    <ImageView
            android:id="@+id/imgvicon"
            tools:srcCompat="@tools:sample/avatars"
            android:layout_width="wrap_content"
            android:layout_height="60dp"
            android:layout_marginTop="8dp"
            android:layout_marginLeft="8dp"
            android:layout_marginStart="8dp"
            android:layout_marginBottom="8dp"
            android:adjustViewBounds="true"/>
    <LinearLayout
            android:orientation="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" android:layout_weight="1">
        <TextView
                android:text="Titulo"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" android:id="@+id/txtv_titulo"
                android:layout_marginLeft="8dp"
                android:layout_marginStart="8dp"
                android:layout_marginEnd="8dp"
                android:layout_marginRight="8dp" android:textSize="18sp"/>
        <TextView
                android:text="Descrição"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" android:id="@+id/txtv_desc"
                android:layout_marginLeft="8dp" android:layout_marginStart="8dp"
                android:layout_marginEnd="8dp"
                android:layout_marginRight="8dp" android:visibility="visible" android:layout_marginTop="3dp"/>
    </LinearLayout>
    <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" android:id="@+id/chkbox"
            android:layout_marginEnd="8dp" android:layout_marginRight="8dp"
            android:layout_marginTop="8dp" android:layout_marginBottom="8dp"
    />
</LinearLayout>

#### Activity 类####

public class FormsMultipleSelectCustomJava extends AppCompatActivity {

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

// I get the items that should be selected separated by commas.
// And I do the following to transform into array, 
//  but I do not know how to use it in dialog.:

String selectItensServer = "0b2,0e5,0f6,0h8";  
String[] selectInitItens = selectItensServer.split(",");

// List of items that should appear in the dialog.

        ArrayList<ALItensValues> AlertDialogitemList = new ArrayList<>();
        AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_bicycle, "0a1", "Test 1", "Lorem ipsum dolor sit amet"));
        AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_btc, "0b2", "Test 2", "Duis at ullamcorper quam"));
        AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_car, "0c3", "Test 3", "Aenean aliquam sit amet nibh eget bibendum"));
        AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_credit_card, "0d4", "Test 4", "Sed a est vel velit rutrum porta"));
        AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_gamepad, "0e5", "Test 5", "Phasellus pellentesque arcu et fermentum tempus"));
        AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_gift, "0f6", "Test 6", "Integer arcu leo, consequat eget tempus sed"));
        AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_paypal, "0g7", "Test 7", "Pellentesque habitant morbi tristique senectus"));
        AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_taxi, "0h8", "Test 8", "Proin iaculis, velit ac consectetur bibendum, orci nisi scelerisque"));
        AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_utensils, "0i9", "Test 9", "Ut ullamcorper nisi dui, et sagittis ante mollis vitae"));
        AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_whatsapp, "k10", "Test 10", "Donec rhoncus magna in mauris ultricies"));


// Button that opens the dialog.
        Button btnopendialog = findViewById(R.id.btnopendialog);
        btnopendialog.setOnClickListener(v -> {
AlertDialog.Builder dialogbuider = new AlertDialog.Builder(context);
    dialogbuider.setCancelable(false);
    dialogbuider.setTitle("Itens");
    ALItensValuesAdapter mAdapter = new ALItensValuesAdapter(ALitensvalues, context);
    dialogbuider.setAdapter(mAdapter, (dialog, which) -> {
        // I do not know what to do here. 
        // But I think it should be here that I start the selected items.
    });
    dialogbuider.setPositiveButton("OK", (dialogInterface, which) -> {
        // And once selected, I would like to display in textview the items that are currently selected.
    });
    dialogbuider.setNeutralButton("Clear", (dialogInterface, which) -> { 
        // Here should clear all checkboxes
    });
    AlertDialog dialog = dialogbuider.create();
    ListView listView = dialog.getListView();
    listView.setDivider(new ColorDrawable(Color.GRAY)); 
    listView.setDividerHeight(2);
    dialog.show();
        });

//Button to send to server.
        findViewById(R.id.btnsend).setOnClickListener(v -> {
             //I need to know how to retrieve the selected items.
        });
    }

Answer 1

正如 Le Thanh Tan 所提到的，接口(interface)是必经之路。

1. 创建MyInterface.java文件并添加这段代码

   public interface MyInterface {
       void onItemChecked(int position);
   }
   

2. 如下更新您的 ALItensValues 类

   public class ALItensValues {
     private int icon;
     private String value;
     private String titulo;
     private String descricao;
     private Boolean isChecked;
   
     public ALItensValues(int icon, String value, String titulo, String descricao, Boolean isChecked) {
      this.icon = icon;
      this.value = value;
      this.titulo = titulo;
      this.descricao = descricao;
      this.isChecked = isChecked;
     }
   
     int getIcon() { return icon; }
     String getValue() { return value; }
     String getTitulo() { return titulo; }
     String getDescricao() { return descricao; }
     Boolean getChecked() { return isChecked; }
     void setChecked(Boolean isChecked) {
       this.isChecked = isChecked;
     }
   }
   

3. 现在您的 Activity 将是

   public class FormsMultipleSelectCustomJava extends AppCompatActivity {
   
      String selectItensServer;  
      String[] selectInitItens;
      ArrayList<ALItensValues> AlertDialogitemList = new ArrayList<>();
      ArrayList<ALItensValues> selectedItemsList = new ArrayList<>();
   
      @Override
      protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_multipleselectcustom);
   
           selectItensServer = "0b2,0e5,0f6,0h8";  
           selectInitItens = selectItensServer.split(",");
   
           AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_bicycle, "0a1", "Test 1", "Lorem ipsum dolor sit amet", true));
           AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_btc, "0b2", "Test 2", "Duis at ullamcorper quam", true));
           AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_car, "0c3", "Test 3", "Aenean aliquam sit amet nibh eget bibendum", false));
           AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_credit_card, "0d4", "Test 4", "Sed a est vel velit rutrum porta", true));
           AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_gamepad, "0e5", "Test 5", "Phasellus pellentesque arcu et fermentum tempus", false));
           AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_gift, "0f6", "Test 6", "Integer arcu leo, consequat eget tempus sed", true));
           AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_paypal, "0g7", "Test 7", "Pellentesque habitant morbi tristique senectus", false));
           AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_taxi, "0h8", "Test 8", "Proin iaculis, velit ac consectetur bibendum, orci nisi scelerisque", true));
           AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_utensils, "0i9", "Test 9", "Ut ullamcorper nisi dui, et sagittis ante mollis vitae", false));
           AlertDialogitemList.add(new ALItensValues(R.drawable.atrib_whatsapp, "k10", "Test 10", "Donec rhoncus magna in mauris ultricies", true));
   
         Button btnopendialog = findViewById(R.id.btnopendialog);
         btnopendialog.setOnClickListener(v -> {
                AlertDialog.Builder dialogbuider = new AlertDialog.Builder(context);
                dialogbuider.setCancelable(false);
                dialogbuider.setTitle("Itens");
                ALItensValuesAdapter mAdapter = new ALItensValuesAdapter(ALitensvalues, context, new MyInterface() {
                  @Override
                  public void onItemChecked(int position) 
                    {
               AlertDialogitemList.get(position).setChecked(!AlertDialogitemList.get(position).getChecked())
                    }
                 });
               dialogbuider.setAdapter(mAdapter, (dialog, which) -> {
   
               });
               dialogbuider.setPositiveButton("OK", (dialogInterface, which) -> {
   
               });
               dialogbuider.setNeutralButton("Clear", (dialogInterface, which) -> { 
               });
               AlertDialog dialog = dialogbuider.create();
               ListView listView = dialog.getListView();
               listView.setDivider(new ColorDrawable(Color.GRAY)); 
               listView.setDividerHeight(2);
               dialog.show();
          });
   
   
            findViewById(R.id.btnsend).setOnClickListener(v -> {
                for(ALItensValues item : AlertDialogitemList) {
                     if(item.isChecked()) {
                          selectedItemsList.add(item);
                     }
                }
               // selected items can be sent to server
         });
      }
   }
   

4. 你的适配器

   private class ALItensValuesAdapter extends BaseAdapter {
      private ArrayList<ALItensValues> mData;
      private Context mContext;
      private MyInterface interface;
   
      ALItensValuesAdapter(ArrayList<ALItensValues> aldata, Context context, MyInterface interface) {
         this.mData = aldata;
         this.mContext = context;
         this.interface = interface;
      }
   
      @Override
      public int getCount() {
         return mData.size();
      }
   
      @Override
      public Object getItem(int position) {
         return null;
      }
   
      @Override
      public long getItemId(int position) {
          return 0;
      }
   
      @Override
      public View getView(int position, View convertView, ViewGroup parent) {
           if (convertView == null) {
              LayoutInflater mInflater = (LayoutInflater) mContext.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
              convertView = Objects.requireNonNull(mInflater).inflate(R.layout.multipleselectcustom_lines, null);
           }
   
           ImageView icon = convertView.findViewById(R.id.imgvicon);
           icon.setImageResource(mData.get(position).getIcon());
           TextView titulo = convertView.findViewById(R.id.txtv_titulo);
           titulo.setText(mData.get(position).getTitulo());
           TextView decricao = convertView.findViewById(R.id.txtv_desc);
           decricao.setText(mData.get(position).getDescricao());
           CheckBox checkbox = convertView.findViewById(R.id.chkbox);
           if(mData.get(position).getChecked()) {
                checkbox.setChecked(true);
           } else {
                checkbox.setChecked(false);
           }
           convertView.setOnClickListener(v -> {
               this.interface.onItemChecked(position);
               checkbox.toggle();
           });
      return convertView;
     }
   }
   

希望这能奏效。