Android从选定的单选button获取价值

我有一个RadioGroup内有三个RadioButton的代码段。 我想设置一个onCheckedListener ，它将在Toas t中显示RadioButton的值，但是到目前为止我所得到的结果并不起作用。 我如何获得RadioButton的价值并将其显示在Toast ？ 预先感谢您，这是我的代码：

 package com.example.toohelps; 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> 

Answer 1

testing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

 <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> 

Answer 2

万一，如果你想做一些单选button的select（没有任何额外的确定button或什么的），你的代码是好的，更新一点。

 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); 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; } } }); } } 

Answer 3

 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(); } } ); 

Answer 4

只要使用getCheckedRadioButtonId（）函数来确定是否检查了任何内容，如果返回-1，则可以避免吐司显示

Answer 5

对于任何以编程方式填充并希望获取索引的用户，您可能会注意到checkedId在您返回到活动/片段时发生了变化，您将重新添加这些单选button。 解决这个问题的一种方法就是用索引设置一个标签：

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

然后在你的听众：

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

Answer 6

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

希望这个作品。 你可以用上面的方式把你的输出转换成string。 gender.getCheckedRadioButtonId(); – 性别是RadioGroup的ID。

Answer 7

非常感谢Chris。

这是我的解决scheme：

 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(); } 

Answer 8

 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(); } }); 

Answer 9

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

Answer 10

当RadioButton被dynamic生成时，我也遇到了单选button的问题。 如果您尝试使用RadioButton.setId()手动设置ID，似乎不起作用。 我的工作是使用View.getChildAt()和View.getParent()来遍历单选button，并确定哪一个被检查。 所有你需要的是首先通过findViewById(R.id.myRadioGroup)获取RadioGroup，然后遍历它的子findViewById(R.id.myRadioGroup) 。 你会知道，当你迭代你在哪个button，你可以简单地使用RadioButton.isChecked()来确定这是否是检查的button。