Java Android 从选定的单选按钮中获取价值

Android getting value from selected radiobutton

提问by user2673161

I have a piece of code with three RadioButtons within a RadioGroup. I want to set an onCheckedListenerthat will show the value of the RadioButtonin a Toast. However what I have gotten so far is not working. How do I get the value of the RadioButtonand display it in a Toast? This is my code:

我有一段代码，RadioButton在RadioGroup. 我想设置的onCheckedListener，将显示的值RadioButton的Toast。但是，到目前为止我所得到的不起作用。如何获取 的值RadioButton并将其显示在 a 中Toast？这是我的代码：

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;

public class MainActivity extends Activity {

    RadioGroup rg;

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

        RadioGroup rg = (RadioGroup) findViewById(R.id.radioGroup1);
        final String value =
            ((RadioButton)findViewById(rg.getCheckedRadioButtonId()))
            .getText().toString();

        rg.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                Toast.makeText(getBaseContext(), value, Toast.LENGTH_SHORT).show();
            }
        });
    }
}

XML file:

XML文件：

<RelativeLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <RadioGroup
        android:id="@+id/radioGroup1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="152dp" >

        <RadioButton
            android:id="@+id/radio0"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Choose 1" />

         <RadioButton
            android:id="@+id/radio1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Choose 2" />

         <RadioButton
            android:id="@+id/radio2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Choose 3" />
     </RadioGroup>
 </RelativeLayout>

采纳答案by chinna_82

Tested and working. Check this

测试和工作。检查这个

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;

public class MyAndroidAppActivity extends Activity {

  private RadioGroup radioGroup;
  private RadioButton radioButton;
  private Button btnDisplay;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    addListenerOnButton();

  }

  public void addListenerOnButton() {

    radioGroup = (RadioGroup) findViewById(R.id.radio);
    btnDisplay = (Button) findViewById(R.id.btnDisplay);

    btnDisplay.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

                // get selected radio button from radioGroup
            int selectedId = radioGroup.getCheckedRadioButtonId();

            // find the radiobutton by returned id
            radioButton = (RadioButton) findViewById(selectedId);

            Toast.makeText(MyAndroidAppActivity.this,
                radioButton.getText(), Toast.LENGTH_SHORT).show();

        }

    });

  }
}

xml

xml

<RadioGroup
        android:id="@+id/radio"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >

        <RadioButton
            android:id="@+id/radioMale"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/radio_male" 
            android:checked="true" />

        <RadioButton
            android:id="@+id/radioFemale"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/radio_female" />

    </RadioGroup>

回答by Kaps

In case, if you want to do some job on the selection of one of the radio buttons (without having any additional OK button or something), your code is fine, updated little.

以防万一，如果您想对单选按钮之一的选择做一些工作（没有任何额外的 OK 按钮或其他东西），您的代码很好，更新很少。

public class MainActivity extends Activity {

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

        RadioGroup rg = (RadioGroup) findViewById(R.id.radioGroup1);

        rg.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() 
        {
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                switch(checkedId){
                    case R.id.radio0:
                        // do operations specific to this selection
                        break;
                    case R.id.radio1:
                        // do operations specific to this selection
                        break;
                    case R.id.radio2:
                        // do operations specific to this selection
                        break;
                }   
            }
        });
    }
}

回答by A. Vin

I have had problems getting radio buttons id's as well when the RadioButtons are dynamically generated. It does not seem to work if you try to manually set the ID's using RadioButton.setId(). What worked for me was to use View.getChildAt()and View.getParent()in order to iterate through the radio buttons and determine which one was checked. All you need is to first get the RadioGroup via findViewById(R.id.myRadioGroup)and then iterate through it's children. You'll know as you iterate through which button you are on, and you can simply use RadioButton.isChecked()to determine if that is the button that was checked.

当 RadioButtons 是动态生成时，我在获取单选按钮 id 时也遇到了问题。如果您尝试使用 手动设置 ID，它似乎不起作用RadioButton.setId()。对我有用的是使用View.getChildAt()和View.getParent()遍历单选按钮并确定检查了哪个。您所需要的只是首先通过 RadioGroup 获取 RadioGroup findViewById(R.id.myRadioGroup)，然后遍历它的子项。当您遍历您所在的按钮时，您就会知道，您可以简单地使用它RadioButton.isChecked()来确定该按钮是否已被选中。

回答by pailodze

just use getCheckedRadioButtonId() function to determine wether if anything is checked, if -1 is return, you can avoid toast appear

只需使用 getCheckedRadioButtonId() 函数来确定是否检查了任何内容，如果返回 -1，则可以避免出现 toast

回答by Turuu

radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
       @Override
       public void onCheckedChanged(RadioGroup group, int checkedId)
       {
           radioButton = (RadioButton) findViewById(checkedId);
           Toast.makeText(getBaseContext(), radioButton.getText(), Toast.LENGTH_SHORT).show();
       }
   }
   );

回答by Chris

For anyone who is populating programmatically and looking to get an index, you might notice that the checkedId changes as you return to the activity/fragment and you re-add those radio buttons. One way to get around that is to set a tag with the index:

对于以编程方式填充并希望获得索引的任何人，您可能会注意到，当您返回活动/片段并重新添加这些单选按钮时，checkedId 会发生变化。解决这个问题的一种方法是使用索引设置标签：

    for(int i = 0; i < myNames.length; i++) {
        rB = new RadioButton(getContext());
        rB.setText(myNames[i]);
        rB.setTag(i);
        myRadioGroup.addView(rB,i);
    }

Then in your listener:

然后在你的听众中：

    myRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            RadioButton radioButton = (RadioButton) group.findViewById(checkedId);
            int mySelectedIndex = (int) radioButton.getTag();
        }
    });

回答by Gowtham

int genid=gender.getCheckedRadioButtonId();
RadioButton radioButton = (RadioButton) findViewById(genid);
String gender=radioButton.getText().toString();

Hope this works. You can convert your output to string in the above manner. gender.getCheckedRadioButtonId();- gender is the id of RadioGroup.

希望这有效。您可以通过上述方式将输出转换为字符串。 gender.getCheckedRadioButtonId();- 性别是 RadioGroup 的 ID。

回答by Jonathan Eduardo Tito Ontaneda

Thanks a lot to Chris.

非常感谢克里斯。

This is my solution:

这是我的解决方案：

RadioGroup radgroup_opcionesEventos = null;


 private static String[] arrayEventos = {
            "Congestión", "Derrumbe", "Accidente"
    };
@Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        radgroup_opcionesEventos = (RadioGroup)findViewById(R.id.rg_opciones_evento);
        int i=0;//a.new.ln
        for(String evento : arrayEventos) {
            //RadioButton nuevoRadio = crearRadioButton(evento);//a.old.ln
            RadioButton nuevoRadio = crearRadioButton(evento,i);//a.new.ln
            radgroup_opcionesEventos.addView(nuevoRadio,i);
        }

        RadioButton primerRadio = (RadioButton) radgroup_opcionesEventos.getChildAt(0);
        primerRadio.setChecked(true);
}

private RadioButton crearRadioButton(String evento, int n)
    {
        //RadioButton nuevoRadio = new RadioButton(this);//a.old.ln
        RadioButton nuevoRadio = new RadioButton(getApplicationContext());//a.new.ln

        LinearLayout.LayoutParams params = new RadioGroup.LayoutParams(
                RadioGroup.LayoutParams.WRAP_CONTENT,
                RadioGroup.LayoutParams.WRAP_CONTENT);
        nuevoRadio.setLayoutParams(params);
        nuevoRadio.setText(evento);
        nuevoRadio.setTag(evento);
        return nuevoRadio;
    }


@Override
    protected void onResume()
    {
        radgroup_opcionesEventos.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId) {
                RadioButton radioButton = (RadioButton) group.findViewById(checkedId);
                //int mySelectedIndex = (int) radioButton.getTag();
                String mySelectedIndex = radioButton.getTag().toString();
            }
        });
        super.onResume();
    }

回答by Sai Gopi N

Radiogroup rgteam;
String team;
rgteam.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {
            RadioButton rb= (RadioButton) findViewById(checkedId);
            team = rb.getText().toString();
        }
    });

回答by Dwivedi Ji

mRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {
        RadioButton radioButton = (RadioButton)group.findViewById(checkedId);
    }
});