Question

我想实现我的onItemSelected，以便当用户单击该复选框时，它将标记为“已选中” 然后更新列DBContract.EntryColumns.IS_CHECKED以检查（将其设置为1）。一切都很好，但问题是我不知道如何实现onItemSelected方法。请有人告诉我如何解决这个问题。

这是我的Activity和list_item_book.xml，其中定义了CheckBox。

public class MainActivity extends AppCompatActivity implements
        BookAdapter.OnItemClickListener,
        View.OnClickListener {

    private BookAdapter mAdapter;
    private CheckBox mCheckBox;

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

        mAdapter = new BookAdapter(null);
        mAdapter.setOnItemClickListener(this);

        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
        recyclerView.setAdapter(mAdapter);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

    }


    /* This method will be called when I Click on checkboxes */
    @Override
    public void onItemSelected(boolean active, int position) {

        //what should I write here?

        //  DBContract.EntryColumns.IS_CHECKED

    //

    }  
}

// list_item_book.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:paddingEnd="@dimen/activity_horizontal_margin"
    android:paddingStart="@dimen/activity_horizontal_margin">

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

</RelativeLayout>

Answer 1

您可以将复选框映射到ID并将其存储到Map＆lt; Checkbox，Integer＆gt;。然后只需在复选框上设置监听器。（假设checkbox变量具有Checkbox类型）

CompoundButton.OnCheckedChangeListener listener = new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {
                // Get the ID here
                int id = yourMapCheckboxToId.get(buttonView);
                // ... do what you are going to do having ID
            }
        }
    };
checkbox.setOnCheckedChangeListener(listener);

复选框如何实现 - android recyclerview

1 个答案: