如何从多个复选框中获取“单个字符串”值，仅选中该复选框

Question

I'm using spinner to get selected value and upload it on firebase database. since from drop down only one value can be selected, so there is another Editbox where individual can write if they have elligible for other option too and it is totally a lengthy process.

So I'm looking to implement multiple check box in Grid view such that when user check the given check box, then I could retrive only the value that are checked in one single string and later upload in firebase.

Here is the code I found

 public class MainActivity_test extends Activity { CheckBox chk1,chk2,chk3,chk4,chk5,chk6,chk7,chk8,chk9; Button btn; TextView txt; ArrayList<String> list ; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_test); list = new ArrayList<String>(); chk1=(CheckBox)findViewById(R.id.checkBox1); chk2=(CheckBox)findViewById(R.id.checkBox2); chk3=(CheckBox)findViewById(R.id.checkBox3); chk4=(CheckBox)findViewById(R.id.checkBox4); chk5=(CheckBox)findViewById(R.id.checkBox5); chk6=(CheckBox)findViewById(R.id.checkBox6); chk7=(CheckBox)findViewById(R.id.checkBox7); chk8=(CheckBox)findViewById(R.id.checkBox8); chk9=(CheckBox)findViewById(R.id.checkBox9); txt = (TextView)findViewById(R.id.textView1); btn =(Button)findViewById(R.id.button1); addListenerOnButton(); } public void addListenerOnButton() { btn.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { for (String str : list) { txt.setText(txt.getText().toString() + " , " + str); } } }); } public void onCheckboxClicked(View view) { boolean checked = ((CheckBox) view).isChecked(); switch(view.getId()) { case R.id.checkBox1: list.add(chk1.getTag().toString()); break; case R.id.checkBox2: list.add(chk2.getTag().toString()); break; case R.id.checkBox3: list.add(chk3.getTag().toString()); break; case R.id.checkBox4: list.add(chk4.getTag().toString()); break; case R.id.checkBox5: list.add(chk5.getTag().toString()); break; case R.id.checkBox6: list.add(chk6.getTag().toString()); break; case R.id.checkBox7: list.add(chk7.getTag().toString()); break; case R.id.checkBox8: list.add(chk8.getTag().toString()); break; case R.id.checkBox9: list.add(chk9.getTag().toString()); break; } } } 

But How do I get the value of only Selected item in as One single String output.

Thanks in advance.

Answer 1

You should do something like this

public class MainActivity_test extends Activity implements CompoundButton.OnCheckedChangeListener{

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

    addCheckboxListner();
}

private void addCheckboxListner(){
    chk1.setOnCheckedChangeListener(this);
    chk2.setOnCheckedChangeListener(this);
    chk3.setOnCheckedChangeListener(this);
    chk4.setOnCheckedChangeListener(this);
    chk5.setOnCheckedChangeListener(this);
    chk6.setOnCheckedChangeListener(this);
    chk7.setOnCheckedChangeListener(this);
    chk8.setOnCheckedChangeListener(this);
    chk9.setOnCheckedChangeListener(this);
}

@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
    onCheckboxClicked(buttonView);
}}