[英]Android getting value from selected radiobutton
我在RadioGroup
中有一段帶有三個RadioButton
的代碼。 我想設置一個onCheckedListener
,它將在Toast
中顯示RadioButton
的值。 但是,到目前為止我所得到的並沒有奏效。 如何獲取RadioButton
的值並將其顯示在Toast
中? 這是我的代碼:
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>
測試和工作。 檢查這個
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>
以防萬一,如果您想對單選按鈕之一的選擇做一些工作(沒有任何額外的 OK 按鈕或其他東西),您的代碼很好,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;
}
}
});
}
}
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();
}
}
);
int genid=gender.getCheckedRadioButtonId();
RadioButton radioButton = (RadioButton) findViewById(genid);
String gender=radioButton.getText().toString();
希望這有效。 您可以通過上述方式將輸出轉換為字符串。 gender.getCheckedRadioButtonId();
- 性別是 RadioGroup 的 ID。
mRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) {
RadioButton radioButton = (RadioButton)group.findViewById(checkedId);
}
});
對於以編程方式填充並希望獲得索引的任何人,您可能會注意到,當您返回活動/片段並重新添加這些單選按鈕時,checkedId 會發生變化。 解決這個問題的一種方法是使用索引設置標簽:
for(int i = 0; i < myNames.length; i++) {
rB = new RadioButton(getContext());
rB.setText(myNames[i]);
rB.setTag(i);
myRadioGroup.addView(rB,i);
}
然后在你的聽眾中:
myRadioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
RadioButton radioButton = (RadioButton) group.findViewById(checkedId);
int mySelectedIndex = (int) radioButton.getTag();
}
});
只需使用getCheckedRadioButtonId()
函數來確定是否檢查了任何內容,如果-1
是return
值,則可以避免顯示 toast
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();
}
});
XML 格式的 RadioGroup
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Java"/>
</RadioGroup>
</RelativeLayout>
活動_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="150dp"
android:layout_marginLeft="100dp"
android:textSize="18dp"
android:text="Select Your Course"
android:textStyle="bold"
android:id="@+id/txtView"/>
<RadioGroup
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/rdGroup"
android:layout_below="@+id/txtView">
<RadioButton
android:id="@+id/rdbJava"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:layout_marginLeft="100dp"
android:text="Java"
android:onClick="onRadioButtonClicked"/>
<RadioButton
android:id="@+id/rdbPython"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:layout_marginLeft="100dp"
android:text="Python"
android:onClick="onRadioButtonClicked"/>
<RadioButton
android:id="@+id/rdbAndroid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:layout_marginLeft="100dp"
android:text="Android"
android:onClick="onRadioButtonClicked"/>
<RadioButton
android:id="@+id/rdbAngular"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="10dp"
android:layout_marginLeft="100dp"
android:text="AngularJS"
android:onClick="onRadioButtonClicked"/>
</RadioGroup>
<Button
android:id="@+id/getBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="100dp"
android:layout_below="@+id/rdGroup"
android:text="Get Course" />
</RelativeLayout>
主活動.java
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
RadioButton android, java, angular, python;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
android = (RadioButton)findViewById(R.id.rdbAndroid);
angular = (RadioButton)findViewById(R.id.rdbAngular);
java = (RadioButton)findViewById(R.id.rdbJava);
python = (RadioButton)findViewById(R.id.rdbPython);
Button btn = (Button)findViewById(R.id.getBtn);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String result = "Selected Course: ";
result+= (android.isChecked())?"Android":(angular.isChecked())?"AngularJS":(java.isChecked())?"Java":(python.isChecked())?"Python":"";
Toast.makeText(getApplicationContext(), result, Toast.LENGTH_SHORT).show();
}
});
}
public void onRadioButtonClicked(View view) {
boolean checked = ((RadioButton) view).isChecked();
String str="";
// Check which radio button was clicked
switch(view.getId()) {
case R.id.rdbAndroid:
if(checked)
str = "Android Selected";
break;
case R.id.rdbAngular:
if(checked)
str = "AngularJS Selected";
break;
case R.id.rdbJava:
if(checked)
str = "Java Selected";
break;
case R.id.rdbPython:
if(checked)
str = "Python Selected";
break;
}
Toast.makeText(getApplicationContext(), str, Toast.LENGTH_SHORT).show();
}
}
非常感謝克里斯。
這是我的解決方案:
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();
}
使用視圖綁定-
如果這里有人想知道如何使用視圖綁定從無線電組中獲取已檢查 ID 的文本,請訪問此處
當 RadioButtons 是動態生成時,我在獲取單選按鈕 id 時也遇到了問題。 如果您嘗試使用RadioButton.setId()
手動設置 ID,它似乎不起作用。 對我View.getChildAt()
是使用View.getChildAt()
和View.getParent()
來遍歷單選按鈕並確定選中了哪個。 您所需要的只是首先通過findViewById(R.id.myRadioGroup)
獲取 RadioGroup,然后遍歷它的子項。 當您遍歷您所在的按鈕時,您就會知道,您可以簡單地使用RadioButton.isChecked()
來確定該按鈕是否已被選中。
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