Android控制元件:RadioButton(單選按鈕)
阿新 • • 發佈:2019-02-12
首先,在佈局檔案 activity_main.xml中註冊一個RadioGroup,併為RadioGroup設定監聽,圖中兩個RadioButton為一個RadioGroup。
activity_main.xml
<LinearLayout 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:orientation="vertical" tools:context=".MainActivity"> <TextView android:text="@string/hello_world" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <RadioGroup android:id="@+id/radioGroupID" android:layout_width="wrap_content" android:layout_height="wrap_content" > <RadioButton android:id="@+id/femaleGroupID" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="female" /> <RadioButton android:id="@+id/maleGroupID" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="male"/> </RadioGroup> </LinearLayout>
MainActivity.java
import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.view.Menu; import android.view.MenuItem; import android.widget.RadioButton; import android.widget.RadioGroup; public class MainActivity extends ActionBarActivity { private RadioGroup radioGroup; private RadioButton femaleRadioButton; private RadioButton maleRadioButton; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //載入佈局檔案 setContentView(R.layout.activity_main); //獲取例項 radioGroup=(RadioGroup)findViewById(R.id.radioGroupID); femaleRadioButton=(RadioButton)findViewById(R.id.femaleGroupID); maleRadioButton=(RadioButton)findViewById(R.id.maleGroupID); //設定監聽 radioGroup.setOnCheckedChangeListener(new RadioGroupListener()); } //定義一個RadioGroup的OnCheckedChangeListener //RadioGroup 繫結的是RadioGroup.OnCheckedChangeListener //CheckBox 繫結的是CompoundButton.OnCheckedChangeListener 或者 view.OnClickListener class RadioGroupListener implements RadioGroup.OnCheckedChangeListener{ @Override public void onCheckedChanged(RadioGroup group, int checkedId) { if (checkedId==femaleRadioButton.getId()){ System.out.println("選中了female!"); }else if (checkedId==maleRadioButton.getId()){ System.out.println("選中了male!"); } } } @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); } }
日誌顯示如下: