为Android列表视图中的行分配ID

我是这样解决这个问题的。我从本地SQLite数据库中获取了employee\ id和employee\ name,然后同时创建了employeeNamesArray的ArrayList和employeeIdArray的ArrayList。因此,employeedArray[0]将与employeeNameArray[0]匹配,employeedArray[1]将与employeeNameArray[1]匹配,等等。

稍后,在onListItemClick中,我检索所选ListView行的位置。此“position”将与ArrayList中的位置对应-因此,如果我在ListView中选择第一行,则该位置将为零,并且employeeNameArray[0]与employeeIdArray[0]匹配。我从employeeIdArray中抓取coroloating条目,并使用putExtra将其推送到下一个活动。

public class MyFirstDatabase extends ListActivity {
    ArrayList<String> employeeIdArray = new ArrayList<String>(); // List of EmployeeIDs

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);                                                           

        // Open the database
        SQLiteDatabase db;
        db = openOrCreateDatabase("mydb.db",SQLiteDatabase.CREATE_IF_NECESSARY, null);
        db.setVersion(1);
        db.setLocale(Locale.getDefault());
        db.setLockingEnabled(true);

        // Query the database
        Cursor cur = db.query("employee", null, null, null, null, null, "employee_lastname"); 

        cur.moveToFirst(); // move to the begin of the db results       

        ArrayList<String> employeeNameArray = new ArrayList<String>(); // Initialize mArrayList


        while (cur.isAfterLast() == false) {
            employeeNameArray.add(cur.getString(1)); // add the employee name to the nameArray
            employeeIdArray.add(cur.getString(0)); // add the employee id to the idArray
            cur.moveToNext(); // move to the next result set in the cursor
        } 

        cur.close(); // close the cursor


        // put the nameArray into the ListView  
        setListAdapter(new ArrayAdapter<String>(this,R.layout.list_item,employeeNameArray));          
        ListView lv = getListView();  
        lv.setTextFilterEnabled(true);
    }


    protected void onListItemClick(ListView l, View v, final int position, long id) { 
        super.onListItemClick(l, v, position, id);                
        Intent myIntent = new Intent(this, SubView.class); // when a row is tapped, load SubView.class

        Integer selectionID = Integer.parseInt(employeeIdArray.get(position)); // get the value from employeIdArray which corrosponds to the 'position' of the selected row
        myIntent.putExtra("RowID", selectionID); // add selectionID to the Intent   

        startActivityForResult(myIntent, 0); // display SubView.class  

    } 
}

    protected void onListItemClick(ListView l, View v, final int position, long id) {
      super.onListItemClick(l, v, position, id);               
      Toast.makeText(this,  "my id to pass along the subview is " + position,Toast.LENGTH_LONG).show();

   }

如果您想分配自己的id,请使用setTag()

v.setTag("myownID"+position);

你不能用标准来做 ArrayAdapter getItemId() 方法,也许还有 hasStableIds()

然后,您必须在hasStableIds方法中返回true,并在给定给getItemId方法的位置生成项的id。

在这上面花了几个小时之后,我发现最简单的方法是重写适配器的bindView,并在项目上设置一个包含行的\u id的标记值——在我的例子中,它是ListView行中的一个按钮。

SimpleCursorAdapter adapter = new SimpleCursorAdapter(this,
        R.layout.note, cursor, fromColumns, toViews, 0) {

    @Override
    // add the _id field value to the button's tag
    public void bindView(View view, Context context, Cursor cursor) {
        super.bindView(view, context, cursor);
        Integer index = cursor.getColumnIndex("_id");
        Integer row_id = cursor.getInt(index);
        Button button = (Button) view.findViewById(R.id.button_delete_record);
        button.setTag(row_id);
    }
};