Question

我在确定是否选中了复选框时遇到问题。这是因为它们是动态生成的。我尝试为每个动态复选框创建OnCheckedChangeListener（），但确定只有最后一个动态复选框的OnCheckedChangeListener（）被执行。

这是我的代码片段（希望它会有所帮助）：

public class yc_SubmitAttendance_ClassMode extends Activity {

Context myContext = this;
myDbAdapter myDB = null;
Cursor myCur = null;
Spinner mySpin = null;

TableLayout tl = null;

CheckBox myCB = null;


public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.yc_studattend_classmode_layout);

    mySpin = (Spinner)findViewById(R.id.spinClassModeSelectModGrp);

    myDB = new myDbAdapter(myContext);

    tl = (TableLayout)findViewById(R.id.classModeTableLayout);
            //retrieve dynamic data
            myCur = myDB.retrieveAttnForSelectedMod(mySpin.getItemAtPosition(arg2).toString());

            myCur.moveToFirst();

            for(byte rowNo=0;rowNo<myCur.getCount();rowNo++)
            {
                TableRow tr = new TableRow(myContext);

                /*Some codes intentionally left missing */

                myCB = new CheckBox(myContext);
                myCB.setId(rowNo);

                //Setting a onCheckedListener on each of the checkbox generated

                myCB.setOnCheckedChangeListener(new OnCheckedChangeListener(){

                    public void onCheckedChanged(CompoundButton arg0,
                            boolean arg1) {
                        // TODO Auto-generated method stub

                        myCur.moveToPosition(myCB.getId());

                        if(myCB.isChecked())
                        {
                            Toast.makeText(myContext,"Attendance deducted to " + ((myCur.getFloat(2)) - 2) + "%", Toast.LENGTH_SHORT).show();
                        }
                        else
                        {
                            Toast.makeText(myContext,"Attendance reverting to " + (myCur.getFloat(2)) + "%", Toast.LENGTH_SHORT).show();
                        }

                    }

                });

                //Insert the checkbox onto this row
                tr.addView(myCB);

                //Append this row to the TableLayout
                tl.addView(tr, new TableLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));

                myCur.moveToNext();

            } //end of for-loop
      } // end of onCreate
}//end of class

但是，我想要的是能够确定每个动态复选框是否已选中或未选中。

Yeong Chai

Answer 1

将此代码替换为：

            myCB.setOnCheckedChangeListener(new OnCheckedChangeListener(){

                public void onCheckedChanged(CompoundButton thisCheckBox,
                        boolean isChecked) {
                    // TODO Auto-generated method stub

                    myCur.moveToPosition(thisCheckBox.getId());

                    if(isChecked)
                    {
                        Toast.makeText(myContext,"Attendance deducted to " + ((myCur.getFloat(2)) - 2) + "%", Toast.LENGTH_SHORT).show();
                    }
                    else
                    {
                        Toast.makeText(myContext,"Attendance reverting to " + (myCur.getFloat(2)) + "%", Toast.LENGTH_SHORT).show();
                    }

                }

问题是你使用myCB.isChecked（）而不是第二个参数“arg1”来确定CheckBox是否被选中。 myCB将始终指向您创建的最后一个CheckBox，因为每次循环时都会分配它。

如何从动态生成的复选框中检索已检查的属性？

1 个答案: