如何获取在android中动态创建的单选按钮的id

Question

In my activity, I am creating a dynamic radiogroup. I have some questions and answers in Sqlite database, retrieving them in activity and then set in RadioGroup. This is working fine. But after that, I want to get all ID of selected radio button by user to store them in database. In general, we do something like this when we have option's ID :

            id1=rdgroup1.getCheckedRadioButtonId();
            que1=(RadioButton)findViewById(id1);
            ans1=que1.getId()+""; // so here I will get radio button's ID.

So my questions is, how will I get selected radio button's ID. Here's my code for dynamically creating radiogroup.

     LinearLayout mLinearLayout = (LinearLayout) findViewById(R.id.linear1);
        c1=db.rawQuery("SELECT * FROM QueTable WHERE AgeGroup='10-20'", null);
        c1.moveToFirst();
        int i = c1.getCount();
        if(i > 0)
        {
            Log.w("START", "start");
            while (i > 0)
            {
                TextView title = new TextView(this);
                questions = c1.getString(1);
                title.setText(questions);
                title.setTextColor(Color.BLACK);
                mLinearLayout.addView(title);
                // create radio button

                answers=c1.getString(2);
                String[] answer = answers.split(",");
                rb = new RadioButton[5];
                rg = new RadioGroup(this);
                rg.setOrientation(RadioGroup.VERTICAL);

                int k = answer.length;

                for (int j = 0; j < k; j++)
                {
                    rb[j] = new RadioButton(this);
                    rg.addView(rb[j]);
                    rb[j].setText(answer[j]);
                }
                mLinearLayout.addView(rg);
                c1.moveToNext();
                i--;
            }
        }

Answer 1

The place where you create RadioButton set and Id to it

  for (int j = 0; j < k; j++)
            {
               RadioButton rb = new RadioButton(this);
                rb.setId(Somenumber + j)
                 rb[j] = rb;
                rg.addView(rb[j]);
                rb[j].setText(answer[j]);
            }

Like this you can setId or also if you want you can add tag to process.

                rb.setTag(SomeObject)

Answer 2

You need to set an ID for your programmatically created RadioButton in order to find it using findViewById as you show in your first code.

To set the ID for your RadioButton , you can use View.setId() . The documentation says:

Sets the identifier for this view. The identifier does not have to be unique in this view's hierarchy. The identifier should be a positive number.

The identifier does not have to be unique, but if it's not unique, findViewById will return the first occurence, so you can use the static method View.generateViewId added on API level 17.

If you are using lower APIs, you may want to write your own function to find a suitable (unused) ID. You can take a look at Android: View.setID(int id) programmatically - how to avoid ID conflicts?

Answer 3

Ok..So finally I got the solution. I am going to share complete code here that will create dynamically radiogroup and radiobuttons from database. Here is code below :

private static final int RB_ID = 100;
int k=0,len=0,r=0,p = 0,q=0, len = 0;

 LinearLayout mLinearLayout = (LinearLayout) findViewById(R.id.linear1);
 c1 = db.rawQuery("SELECT * FROM QueMotion WHERE AgeGroup ='"+Age+"' LIMIT 5", null);
            c1.moveToFirst();
            int i = c1.getCount();
            rg = new RadioGroup[i];
            rb = new RadioButton[i*5];
            if (i > 0) {
                Log.w("START", "start");
                while (i > 0)
                {
                    TextView title = new TextView(this);
                    questions = c1.getString(1);// retrive from database
                    title.setText(questions);
                    title.setTextColor(Color.BLACK);
                    title.setTypeface(null, Typeface.BOLD);
                    title.setPadding(0, 0, 0, 10);
                    mLinearLayout.addView(title);
                    answers = c1.getString(2);// retrive from database
                    String[] answer = answers.split(",");// will create options for radio button.
                    rg[p] = new RadioGroup(this);
                    rg[p].setOrientation(RadioGroup.VERTICAL);
                    len=len+answer.length;
                    for (int j = 0; j < answer.length; j++)
                    {
                            rb[q] = new RadioButton(this);
                            rg[p].addView(rb[q]);
                            rb[q].setId(k + RB_ID);
                            rb[q].setText(answer[j]);
                            k++;
                            q++;
                    }
                    mLinearLayout.addView(rg[p]);
                    c1.moveToNext();
                    i--;
                    p++;
                }

    //Submit button click
     submit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v)
            {
                if (rg[0].getCheckedRadioButtonId() == -1)
                {
                    Log.e("Nothing selected", "Nothing selected");
                }
                else
                {
                    for (r = 0; r < len; r++) {
                        if (rb[r].isChecked()) {
                            RadioButton id = (RadioButton) findViewById(rb[r].getId());
                            String radioText = id.getText().toString();
                            c3.moveToFirst();
                            Log.e("RadioString", radioText);
                        } else {
                            Log.e("RadioString", "nothing");
                        }
                    }
                }
            }
        });