如何使数据库游标支持的列表视图中的 ImageView 可单击

Question

我有一个人员列表，我正在使用[修改的] SimpleCursorAdapter从数据库中提取人员。然后，我循环访问光标，并在应用的 ListView 中打印出信息。

现在，它被编码为当我单击一行时，我的应用程序会根据从数据库中检索到的信息执行功能。但是，我想做的是，当我单击行中的 ImageView 时，我的应用程序将根据从数据库中检索的信息执行适当的功能。

我想要的是当我点击"状态"ImageView时，我希望它执行功能"A"，

当我点击"位置"ImageView时，我希望它执行功能"B"。

我遇到麻烦的地方是隔离列表视图行中的图像视图，以便在该图像视图而不是整行上使用setOnItemClickListener。我很确定我需要进一步修改我修改的光标适配器，但我不确定如何修改。

这是我所拥有的：

首页.java

package myPackage;
public class Home extends Fragment {
    private View rootView;
    private AlternateRowColorSimpleCursorAdapter mySimpleCursorAdapter;
    private ViewPager myViewPager;
    private SwipeRefreshLayout studentSwipeRefresh;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
        rootView = inflater.inflate(R.layout.home, container, false);
        myViewPager = (ViewPager) getActivity().findViewById(R.id.pager);
        studentSwipeRefresh = (SwipeRefreshLayout) rootView.findViewById(R.id.student_swipe_refresh);
        return rootView;
    }
    @Override
    public void onViewCreated(View rootView, Bundle savedInstanceState) {
        super.onViewCreated(rootView, savedInstanceState);
        drawTheStudentView();
        studentSwipeRefresh.setColorSchemeColors(Color.parseColor(Constants.RED), Color.parseColor(Constants.ORANGE), Color.parseColor(Constants.YELLOW), Color.parseColor(Constants.GREEN), Color.parseColor(Constants.BLUE), Color.parseColor(Constants.INDIGO), Color.parseColor(Constants.VIOLET));
        studentSwipeRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
            @Override
            public void onRefresh() {
                studentSwipeRefresh.setRefreshing(false);
                drawTheStudentView();
            }
        });
    }
    private void drawTheStudentView(){
        DatabaseHelper myDBHelper = new DatabaseHelper(getActivity());
        Cursor studentCursor = myDBHelper.getStudentsCursor();
        String[] fromColumns = {"_id","studentID","status","location"};
        int[] toViews = {R.id.student_number_textview, R.id.student_id_textview};
        // What I want it to be ...
        // int[] toViews = {R.id.student_number_textview, R.id.student_id_textview, R.id.student_status_imageview, R.id.student_location_imageview};
        mySimpleCursorAdapter = new AlternateRowColorSimpleCursorAdapter(getActivity(), R.layout.student_layout, studentCursor, fromColumns, toViews, 0);
        // Replace the _id column with a student count
        mySimpleCursorAdapter.setViewBinder(new SimpleCursorAdapter.ViewBinder() {
            @Override
            public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
                String counter = Integer.toString((cursor.getPosition()+1));
                TextView modifiedTextView = (TextView) view;
                if(columnIndex == 0){
                    modifiedTextView.setText(counter);
                    return true;
                }
                return false;
            }
        });
        ListView myListView = (ListView) rootView.findViewById(R.id.student_row);
        // Listen for somebody clicking on a Student ID, and process
        myListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Cursor subCursor = (Cursor) mySimpleCursorAdapter.getItem(position);
                String studentIDNumber = subCursor.getString(subCursor.getColumnIndex("studentID"));
                StudentStatus studentStatus = (StudentStatus) getFragmentManager().findFragmentByTag(getFragmentTag(Constants.TAB_INDEX_PATIENT_VITALS));
                studentStatus.setStudentIDNumber(studentIDNumber);
                myViewPager.setCurrentItem(Constants.TAB_INDEX_PATIENT_VITALS);
            }
        });
        // Draw the list
        myListView.setAdapter(mySimpleCursorAdapter);
        myDBHelper.close();
    }
    // Pass me a tab index (see Constants.java) and I'll return a refrence to that tab.
    private String getFragmentTag(int tagID){
        return "android:switcher:" + R.id.pager + ":" + tagID;
    }
}

AlternateRowColorSimpleCursorAdapter.java

package myPackage;
public class AlternateRowColorSimpleCursorAdapter extends SimpleCursorAdapter {
    public AlternateRowColorSimpleCursorAdapter(Context context, int layout, Cursor c, String[] from, int[] to, int flags) {
        super(context, layout, c, from, to, flags);
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent){
        View row = super.getView(position, convertView, parent);
        if(position % 2 == 0){
            row.setBackgroundColor(Color.parseColor(Constants.WHITE));
        } else {
            row.setBackgroundColor(Color.parseColor(Constants.LIGHTGREY));
        }
        return row;
    }
}

student_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="wrap_content"
    android:layout_width="match_parent">
    <TextView
        android:id="@+id/student_number_textview"
        android:typeface="monospace"
        android:layout_weight="1"
        android:textStyle="bold"
        style="@style/StudentStyle" />
    <TextView
        android:id="@+id/student_id_textview"
        android:typeface="monospace"
        style="@style/StudentStyle" />
    <ImageView
        android:id="@+id/student_status_button"
        style="@style/studentIconLink"
        android:src="@drawable/status_icon"/>
    <ImageView
        android:id="@+id/student_location_button"
        style="@style/studentIconLink"
        android:src="@drawable/location_icon"/>
</LinearLayout>

Answer 1

修改适配器以添加单击侦听器：

public View getView(final int position, View convertView, ViewGroup parent){
  // your code goes here, then add the following
     ImageView statusButton = row.findViewById(R.id.student_status_button);
     ImageView locationButton = row.findViewById(R.id. student_location_button);
     OnClickListener statusButtonListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            notifyStatusButtonListenerClicked(position);
        }
     };
     OnClickListener locationButtonListener = new OnClickListener() {
        @Override
        public void onClick(View v) {
            notifyLicationButtonListenerClicked(position);
        }
    };
  return row;
}

这两个通知都可以通过接口传递到您的活动/片段。只需添加像 notifyLicationButtonListenerClicked（int position） 这样的方法，这些方法将在实现接口的侦听器上调用方法。此外，请确保删除每行设置的现有 setOnItemClickListener 侦听器。

Answer 2

在光标适配器中创建一个静态类来保存列表的元素（静态不是强制性的），然后在getView中初始化这些元素

用 公共无效绑定视图（视图视图、上下文上下文、光标光标）

在单击侦听器时将光标适配器设置为列表视图的任何元素的方法

例：

public View newView(Context context, Cursor cursor, ViewGroup parent) {
View view = mLayoutInflater.inflate(R.layout.list, parent, false);
    ViewHolder viewHolder = new ViewHolder();
    viewHolder.mImage= (ImageView) view.findViewById(R.id.imageview);
view.setTag(viewHolder);
}
@Override
public void bindView(View view, final Context context, final Cursor cursor) {
final ViewHolder viewHolder = (ViewHolder) view.getTag();
viewHolder.mImage.setOnclickListener(new OnClickListener(){
  //do stuff
});
}
public static Class ViewHolder{
  public ImageView mImage;
}

你可以使用imageButton（这只是一个例子）