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ラジオグループのどのラジオボタンが選択されているかを確認するにはどうすればよいですか？ [アンドロイド]

複数のラジオボタンを持つ2つのラジオグループを使用していますが、特定の関数を呼び出すことができるように、どちらのラジオボタンが選択されているかを確認したいと思います。 getCheckedRadioButtonIdメソッドを使用してこれを実行していますが、nullポインター例外がスローされます。これを正しい方法で行うにはどうすればよいですか？私も他の方法を試しました。どんな助けでもありがたいです。これが私のコードです

public class MainActivity extends AppCompatActivity {
private EditText et_name;
private EditText et_age;
private EditText et_contactno;

private RadioGroup radioGroup_gender;
private RadioButton radioButton_male;
private RadioButton radioButton_female;
private RadioGroup radioGroup_methods;
private RadioGroup radioGroup_intent_methods;
private RadioButton radioButton_textfile;
private RadioButton radioButton_sharefpref;
private RadioButton radioButton_database;
private RadioButton radioButton_staticfields;
private RadioButton radioButton_intents;
private RadioButton radioButton_direct;
private RadioButton radioButton_bundle;
private RadioButton radioButton_parcelable;

private String name;
private String age;
private String contact_no;
private String gender;

private int gender_selected_id;
private int transfer_method_selected_id;
private int selected_intent_method_id;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    findViewsByIds();
    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "FAB CLICKED", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
            executeSelectedMethod();
        }
    });
}

private void findViewsByIds() {
    et_name = (EditText) findViewById(R.id.et_name);
    et_age = (EditText) findViewById(R.id.et_age);
    et_contactno = (EditText) findViewById(R.id.et_contactno);
    radioGroup_gender = (RadioGroup) findViewById(R.id.rg_gender);
    radioButton_male = (RadioButton) findViewById(R.id.rb_male);
    radioButton_female = (RadioButton) findViewById(R.id.rb_female);

    radioGroup_methods = (RadioGroup) findViewById(R.id.rg_methods);
    radioGroup_intent_methods = (RadioGroup) findViewById(R.id.rg_intentmethods);
    radioButton_textfile = (RadioButton) findViewById(R.id.rb_textfile);
    radioButton_sharefpref = (RadioButton) findViewById(R.id.rb_sharefpref);
    radioButton_database = (RadioButton) findViewById(R.id.rb_database);
    radioButton_staticfields = (RadioButton) findViewById(R.id.rb_static);
    radioButton_intents = (RadioButton) findViewById(R.id.rb_intent);
    radioButton_direct = (RadioButton) findViewById(R.id.rb_intent_direct);
    radioButton_bundle = (RadioButton) findViewById(R.id.rb_intent_bundle);
    radioButton_parcelable = (RadioButton) findViewById(R.id.rb_intent_parcelable);
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

private void executeSelectedMethod() {
    try {
        name = et_name.getText().toString();
        age = et_age.getText().toString();
        contact_no = et_contactno.getText().toString();
        RadioButton rb = (RadioButton) findViewById(radioGroup_gender.getCheckedRadioButtonId());
        String selectedgender = rb.getText().toString();
        if (selectedgender.equalsIgnoreCase("Male")) {
            gender = radioButton_male.getText().toString();
        } else if (selectedgender.equalsIgnoreCase("Female")) {
            gender = radioButton_female.getText().toString();
        }
        RadioButton rb_selected_method = (RadioButton) findViewById(radioGroup_gender.getCheckedRadioButtonId());
        String selectedRadioButtontext = rb_selected_method.getText().toString();
        if (selectedRadioButtontext.equalsIgnoreCase("Text File")) {
            ConstantFile.TRANSFER_METHOD = radioButton_textfile.getText().toString();
            executeTextFileMethod();
        } else if (transfer_method_selected_id == R.id.rb_sharefpref) {
            ConstantFile.TRANSFER_METHOD = radioButton_sharefpref.getText().toString();
        } else if (transfer_method_selected_id == R.id.rb_database) {
            ConstantFile.TRANSFER_METHOD = radioButton_database.getText().toString();
        } else if (transfer_method_selected_id == R.id.rb_static) {
            ConstantFile.TRANSFER_METHOD = radioButton_staticfields.getText().toString();
        } else {

            selected_intent_method_id = radioGroup_intent_methods.getCheckedRadioButtonId();
            if (selected_intent_method_id == R.id.rb_intent_direct) {
                ConstantFile.TRANSFER_METHOD = radioButton_direct.getText().toString();
            } else if (selected_intent_method_id == R.id.rb_intent_bundle) {
                ConstantFile.TRANSFER_METHOD = radioButton_bundle.getText().toString();

            } else if (selected_intent_method_id == R.id.rb_intent_parcelable) {
                ConstantFile.TRANSFER_METHOD = radioButton_parcelable.getText().toString();

            }
        }
    } catch (IOException e) {
        e.printStackTrace();
    }
}

private void executeTextFileMethod() throws IOException {
    File transfer_file = new File("/sdcard/" + name + ".txt");
    transfer_file.createNewFile();
    FileOutputStream fileoutputstrem = new FileOutputStream(transfer_file);
    OutputStreamWriter outstreamwriter = new OutputStreamWriter(fileoutputstrem);
    outstreamwriter.append(name + ":" + age + ":" + contact_no + ":" + gender);
    fileoutputstrem.close();
    outstreamwriter.close();
    Toast.makeText(this, "This is my Toast message!",
            Toast.LENGTH_LONG).show();
    ConstantFile.TXTFILENAME = transfer_file.getName();
    goToNextActivity();
}

private void goToNextActivity() {
    Intent intent = new Intent(MainActivity.this, Main2Activity.class);
    startActivity(intent);
}}

これは例外です：

Process: com.phaseone_datatransferbetweenactivities, PID: 22385
Java.lang.NullPointerException: Attempt to invoke virtual method 'Java.lang.CharSequence Android.widget.RadioButton.getText()' on a null object reference
at com.phaseone_datatransferbetweenactivities.MainActivity.executeSelectedMethod(MainActivity.Java:118)
at com.phaseone_datatransferbetweenactivities.MainActivity.access$000(MainActivity.Java:23)
at com.phaseone_datatransferbetweenactivities.MainActivity$1.onClick(MainActivity.Java:65)
at Android.view.View.performClick(View.Java:5265)
at Android.view.View$PerformClick.run(View.Java:21534)
at Android.os.Handler.handleCallback(Handler.Java:815)
at Android.os.Handler.dispatchMessage(Handler.Java:104)
at Android.os.Looper.loop(Looper.Java:207)
at Android.app.ActivityThread.main(ActivityThread.Java:5728)
at Java.lang.reflect.Method.invoke(Native Method)
at com.Android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.Java:789)
at com.Android.internal.os.ZygoteInit.main(ZygoteInit.Java:679)
androidradio-buttonradio-group
6
User

その動作は完全に

RadioGroup radioGroup = (RadioGroup) findViewById(R.id.radio_group);

int radioButtonID = radioGroup.getCheckedRadioButtonId();

RadioButton radioButton = (RadioButton) 

radioGroup.findViewById(radioButtonID);

String selectedtext = (String) radioButton.getText();
11
vijay chhalotre

これを使ってみてくださいそれも私のために働いています

radioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(RadioGroup rGroup, int checkedId) {

                int radioBtnID = rGroup.getCheckedRadioButtonId();

                View radioB = rGroup.findViewById(radioBtnID);

                int position = group.indexOfChild(radioB);
            }
        });
3
vijay chhalotre

次のコードを使用します。

RadioGroup rg = your_radio_group;

// It will return currently selected radio button id from RadioGroup
int id = rg.getCheckedRadioButtonId();

if(id == your_one_radio_button_id){
 // First radio button is selected.
} else if(id == your_two_radio_button_id){
 // Second radio button is selected.
}
2
Jitesh Dalsaniya
 int radioButtonID = radioButtonGroup.getCheckedRadioButtonId();

 View radioButton = radioButtonGroup.findViewById(radioButtonID);

 int idx = radioButtonGroup.indexOfChild(radioButton);

RadioGroupに他のビュー（TextViewなど）が含まれている場合、indexOfChild（）メソッドは間違ったインデックスを返します。 RadioGroupで選択されたRadioButtonテキストを取得するには

 RadioButton r = (RadioButton)  radioButton .getChildAt(idx);

 String selectedtext = r.getText().toString();
1
vijay chhalotre
radioGroup = view.findViewById(R.id.choices);
 try {
       radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() 
       {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                RadioButton radioButton = view.findViewById(checkedId);
                //selected index
                mctSelectedAnsIndex = checkedId;
                Log.e("mctSelectedAnsIndex",mctSelectedAnsIndex+"-"+checkedId);
                int j = radioGroup.getChildCount();
               //changing background of all radio buttons in group
                for (int i = 0; i < j; i++) {
 radioGroup.getChildAt(i).setBackgroundColor(getActivity().getApplicationContext().
 getResources().getColor(R.color.lgrey));
                }

//code for changing background of selected one                      

radioButton.setBackgroundColor(getActivity().getApplicationContext().
getResources().getColor(R.color.color2));

                if (mctSelectedAnsIndex == correctAnsChoice){
                    rightAnswers++;
                }else{
                    wrongAnswers++;
                }

            }
        });
    } catch (Exception e) {
        e.printStackTrace();
    }
0
Sreejesh K Nair
                int id = radioGroup.getCheckedRadioButtonId(); 
                 if(id!=-1){
                    int radioButtonID = radioGroup.getCheckedRadioButtonId();
                    RadioButton radioButton = 
                        (RadioButton)radioGroup.findViewById(radioButtonID);

                    String selectedtext = (String) radioButton.getText();
                      Toast.makeText(ReportsAct.this, ""+selectedtext, 
                       Toast.LENGTH_SHORT).show();
                }
0
Syed Danish Haider

これを試して、IDとテキストの両方を取得するために私のために働いています

radioGroup = findViewById(R.id.radio_group);
    radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {

        @Override
        public void onCheckedChanged(RadioGroup rGroup, int checkedId) {
            int radioButtonID = radioGroup.getCheckedRadioButtonId();
            View radioButton = radioGroup.findViewById(radioButtonID);
            int idx = radioGroup.indexOfChild(radioButton);
            RadioButton r = (RadioButton) radioGroup.getChildAt(idx);
            String selectedText = r.getText().toString();
            System.out.println(idx);//For print Id
            System.out.println(selectedText);//For print Text
        }
    });
0
Aftab Alam