Android 基本控制元件的使用三(RadioButton)
RadioButton是單選按鈕,即若干個單選按鈕中只能選擇其中的某一個選項,
如果需要若干個單選按鈕實現互斥效果,則這些單選按鈕必須是同一個RadioGroup的子級控制元件。
RadioGroup的本質是LinearLayout,在設計時,需要為RadioGroup新增android:orientation屬性。
RadioButton的使用與CheckBox基本相同。
/**
為按鈕設定監聽,在點提交時土司 愛好,性別
**/
activity_main.xml
<RelativeLayoutxmlns: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
tools:context=".MainActivity">
<TextView
android:id="@+id/tv_fav_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="請選擇您的愛好:"/>
<CheckBox
android:id="@+id/cb_coding"
android:layout_width="wrap_content"
android:layout_height=
android:layout_alignParentLeft="true"
android:layout_below="@+id/tv_fav_title"
android:checked="true"
android:text="程式設計"/>
<CheckBox
android:id="@+id/cb_shopping"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/cb_coding"
android:layout_toRightOf="@+id/cb_coding"
android:text="購物"/>
<CheckBox
android:id="@+id/cb_sing"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/cb_shopping"
android:layout_toRightOf="@+id/cb_shopping"
android:text="唱歌"/>
<TextView
android:id="@+id/tv_gender_title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/cb_coding"
android:text="請選擇您的性別:"/>
<RadioGroup
android:id="@+id/rg_gender"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/tv_gender_title"
android:orientation="vertical">
<RadioButton
android:id="@+id/rb_gender_male"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:checked="true"
android:text="男" />
<RadioButton
android:id="@+id/rb_gender_female"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="女" />
</RadioGroup>
<Button
android:id="@+id/btn_submit"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/cb_coding"
android:layout_below="@+id/rg_gender"
android:text="提交"/>
</RelativeLayout>
MainActivity.java
package cn.sophia.raidobutton;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;
public class MainActivity extends Activity {
// 宣告控制元件
private CheckBox coding;
private CheckBox shopping;
private CheckBox sing;
private RadioGroup rgGender;
private Button btnSubmit;
private RadioButton male;
private RadioButton female;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 初始化控制元件
initViews();
// 為按鈕設定監聽
btnSubmit.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// 宣告最後顯示的興趣
String text = "";
// 宣告最後顯示的性別
String gender = "";
if(male.isChecked()){
gender += male.getText().toString();
}
if(female.isChecked()){
gender += female.getText().toString();
}
if (coding.isChecked()) {
text += coding.getText();
}
if (shopping.isChecked()) {
text += shopping.getText() + "_";
}
if (sing.isChecked()) {
text += sing.getText() + "_";
}
if (!"".equals(text)) {
Toast.makeText(MainActivity.this, "愛好是"+text+";"+"性別是"+gender,
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(MainActivity.this, "沒有愛好"+"性別是"+gender,,
Toast.LENGTH_SHORT).show();
}
}
});
}
/**
* 初始化控制元件
*/
private void initViews() {
btnSubmit = (Button) findViewById(R.id.btn_submit);
coding = (CheckBox) findViewById(R.id.cb_coding);
shopping = (CheckBox) findViewById(R.id.cb_shopping);
sing = (CheckBox) findViewById(R.id.cb_sing);
rgGender = (RadioGroup) findViewById(R.id.rg_gender);
male = (RadioButton) findViewById(R.id.rb_gender_male);
female = (RadioButton) findViewById(R.id.rb_gender_female);
}
}