如何在列表视图中的每个条目上显示复选框

Question

从此活动中，我从 textField 获取文本并将其显示在 ListView 中。 现在我想在 listView 单元格中的每个条目上添加复选框，并且还想知道如何在单个 ListView 单元格中显示多个文本。 代码帮助将不胜感激。 这是我的代码....

public class AfterRegister extends AppCompatActivity
{
    ListView listView;
    EditText editText;
    Button insertItemButton;
    ArrayList<String> arrayList = new ArrayList<String>();
    ArrayAdapter<String> adapter;
    CheckBox checkBox;

    StoreRegistrationDataBase storeRegistrationDataBase;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_after_register);
        storeRegistrationDataBase = new StoreRegistrationDataBase(this);
        storeRegistrationDataBase = storeRegistrationDataBase.open();

        checkBox = (CheckBox) findViewById(R.id.checkbox);

        insertItemButton = (Button) findViewById(R.id.button4);
        insertItemButton.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v)
            {
                editText = (EditText) findViewById(R.id.editText2);
                listView = (ListView) findViewById(R.id.listView);
                String getEditTextString = editText.getText().toString();

                if(isAlphaNumeric(getEditTextString))
                {
                    if(!getEditTextString.equals(""))

                    {
                        arrayList.add(getEditTextString);

                        adapter = new ArrayAdapter<String>(getBaseContext(), R.layout.text_view_layout, R.id.achView1, arrayList);
                        listView.setAdapter(adapter);



                        adapter.notifyDataSetChanged();
                        editText.setText("");

                    }
                    else
                    {
                        Toast.makeText(AfterRegister.this, "You can not insert empty field", Toast.LENGTH_SHORT).show();
                    }
                }
                else
                {
                    Toast.makeText(AfterRegister.this, "Remove Space", Toast.LENGTH_SHORT).show();
                }
            }
        });
        listView.setOnTouchListener(new View.OnTouchListener()
        {
            @Override
            public boolean onTouch(View v, MotionEvent event)
            {

                return false;
            }
        });
    }

    public boolean isAlphaNumeric(String s)
    {
        String pattern= "^[a-zA-Z0-9]*$";
        if(s.matches(pattern))
        {
            return true;
        }
        return false;
    }
}

Answer 1

您必须使用 BaseAdapter 和一些 Getter/Setter 方法在列表视图的每个项目中添加多个文本/图像/其他 UI 元素。

您必须执行多项操作才能获得此结果。他们在这里--

1. 为 ListView 的每个项目创建自定义布局。

listview_item_layout.xml

<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:orientation="vertical">

    <TextView
        android:id="@+id/layout_textview1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="15sp"
        android:layout_marginRight="5dip"
        android:textStyle="bold"/>

    <TextView
        android:id="@+id/layout_textview2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="15sp"
        android:layout_marginLeft="5dip"
        android:textStyle="bold"/>

            <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" 
            android:id="@+id/checkbox"
            android:text="Test"/>

</LinearLayout>

1. 创建一个自定义类并添加一些 Getter/Setter 方法。

ListRowItem.java

public class ListRowItem implements Serializable{
String carrier,number;

public String getCarrier(){
    return carrier;
}

public String getNumber(){
    return number;
}

public void setCarrier(String ba_carrier){
    carrier = ba_carrier;
}

public void setNumber(String ba_number){
    number = ba_number;
}
}

1. 创建一个自定义类并扩展 BaseAdapter 类。

   public class MyBaseAdapter extends BaseAdapter {
   
   public Context ba_context;
   public ArrayList<ListRowItem> listitem = new ArrayList<>();
   public LayoutInflater inflater;
   ListRowItem currentlistitem;
   
   public MyBaseAdapter(Context ma_context, ArrayList<ListRowItem> ma_listitem) {
   super();
   this.ba_context = ma_context;
   this.listitem = ma_listitem;
   
   inflater = (LayoutInflater) ba_context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
   }
   
   @Override
   public int getCount() {
   return this.listitem.size();
   }
   
   @Override
   public Object getItem(int position) {
   return this.listitem.get(position);
   }
   
   @Override
   public long getItemId(int position) {
   return (long) position;
   }
   
   @Override
   public View getView(int position, View convertView, ViewGroup parent) {
   View vi = convertView;
   
   if (convertView == null)
       vi = inflater.inflate(R.layout.listview_item_layout, parent, false);
   
   TextView carrier = (TextView) vi.findViewById(R.id.layout_textview1);
   TextView number = (TextView) vi.findViewById(R.id.layout_textview2);
   
   currentlistitem = listitem.get(position);
   
   String str_carrier = currentlistitem.getCarrier();
   String str_number = currentlistitem.getNumber();
   
   carrier.setText(str_carrier);
   number.setText(str_number);
   
   return vi;
   }
   }
   

2. 最后，填充 ArrayList 并在 MainActivity 中设置 Adapter。

   ArrayList<ListRowItem> listitem = new ArrayList<>();
   Context context = TestActivity.this;
   MyBaseAdapter baseAdapter;
   
   ListRowItem lr = new ListRowItem();
   lr.setNumber(number);
   lr.setCarrier(carrier);
   
   listitem.add(lr);
   
   baseAdapter = new MyBaseAdapter(context,listitem);
   
   setContentView(R.layout.activity_test);
   listView = (ListView) findViewById(R.id.list_view);
   listView.setAdapter(baseAdapter);
   

希望这会有所帮助！