如何檢查收音機組的哪個單選按鈕被選中？ [ANDROID]

我正在使用兩個無線電組與多個單選按鈕，我想檢查哪個單選按鈕被選中，以便我可以相應地調用特定的功能。我正在使用getCheckedRadioButtonId方法做到這一點，但它拋出空指針異常。如何以正確的方式做到這一點，我也嘗試了其他方法。任何幫助將這裏瞭解是我的代碼如何檢查收音機組的哪個單選按鈕被選中？ [ANDROID]

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); 
}}

這是例外：

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)

來源

2017-02-28 User

可以setOnCheckedChangeListener（）上收音機組，然後你會得到一個選中的單選按鈕ID –

其工作perfactly

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

int radioButtonID = radioGroup.getCheckedRadioButtonId(); 

RadioButton radioButton = (RadioButton) 

radioGroup.findViewById(radioButtonID); 

String selectedtext = (String) radioButton.getText();

來源

2017-02-28 07:04:22

使用下面的代碼。

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. 
}

來源

2017-02-28 07:07:34

我已經使用它，這不會返回該單選按鈕的ID，而是它返回值類似這樣的「345323」 – User

已檢查如果條件結果？如果有多個單選按鈕，則需要放入其他位置。檢查更新的答案 –

int radioButtonID = radioButtonGroup.getCheckedRadioButtonId(); 

View radioButton = radioButtonGroup.findViewById(radioButtonID); 

int idx = radioButtonGroup.indexOfChild(radioButton);

如果RadioGroup中含有其他視圖（如一個TextView等），那麼indexOfChild（）方法將返回錯誤的索引。獲取所選的單選按鈕文本上RadioGroup中

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

String selectedtext = r.getText().toString();

來源

2017-02-28 07:11:07

嘗試使用此一個也它爲我工作

radioGroup.setOnCheckedChangeListener（新OnCheckedChangeListener（）{

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

      int radioBtnID = rGroup.getCheckedRadioButtonId(); 

      View radioB = rGroup.findViewById(radioBtnID); 

      int position = group.indexOfChild(radioB); 
     } 
    });

來源

2017-02-28 07:14:30

如何檢查收音機組的哪個單選按鈕被選中？ [ANDROID]

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