android开发学习笔记——稍复杂控件 RadioGroup,CheckBox,Toast

最近刚开始学java，学android，下面时学习笔记，发现什么问题欢迎各位大牛指正……

对于Button TextView EditView 等的操作比较简单，就没做什么笔记，今天下午主要是RadioGroup,CheckBox,Toast 

下图是仿真器图片：

     RadioButton布局在RadioGroup下面，radioButton只能够单选，CheckBox实现复选。下面是main activity java代码：

package com.example.radiogroup;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.widget.Button;import android.widget.CheckBox;import android.widget.RadioButton;import android.widget.RadioGroup;import android.widget.TextView;import android.widget.Toast;public class MainActivity extends Activity {/*layout文件夹下XML相关联  可以不用再次定义 初始化private RadioGroup radiogroup = null;private RadioButton radiobutton1 = null;private RadioButton radiobutton2 = null;private RadioButton radiobutton3 = null;private CheckBox checkbox1 = null;private CheckBox checkbox2 = null;private Button confirmbutton = null;private Button exitbutton = null;private TextView textview = null;*/@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);/*radiogroup = (RadioGroup) findViewById(R.id.radiogroup);radiobutton1 = (RadioButton) findViewById(R.id.radioButton1);radiobutton2 = (RadioButton) findViewById(R.id.radioButton2);radiobutton3 = (RadioButton) findViewById(R.id.radioButton3);checkbox1 = (CheckBox) findViewById(R.id.checkBox1);checkbox2 = (CheckBox) findViewById(R.id.checkBox2);confirmbutton = (Button) findViewById(R.id.button1);exitbutton = (Button) findViewById(R.id.button2);textview = (TextView) findViewById(R.id.textView1);*/}// radiogroup sexual 每点击一次radioGroup控件调用一次// whichone(View view)在layout XML中与radioGroup控件相关联public void whichone(View view) {// view.getId() 返回选中的radiobutton的Idboolean checked = ((RadioButton) view).isChecked();// view.getId()获得动作的button的idswitch (view.getId()) {case R.id.radioButton1:if (checked)System.out.println(view.getId() + " 爷们");break;case R.id.radioButton2:if (checked)System.out.println(view.getId() + " 娘们");break;case R.id.radioButton3:if (checked)System.out.println(view.getId() + " 二茬");break;}}// checkbox hobbies// sport(View view)与checkBox相关联public void sport(View view) {// Is the view now checked?boolean checked = ((CheckBox) view).isChecked();switch (view.getId()) {case R.id.checkBox1:if (checked)System.out.println(view.getId() + " like swimming");break;case R.id.checkBox2:if (checked)System.out.println(view.getId() + " like jogging");break;// TODO: Veggie sandwich}}// confirm the information// confirminf(View view)与confirmbutton相关联public void confirminf(View view) {//toast控制漂浮窗口 不是新的activity    Toast toast = Toast.makeText(MainActivity.this, "真的这样填写么",Toast.LENGTH_SHORT);toast.show();}// exit programpublic void exitprogram(View view) {System.exit(0);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

     下面是layout当中 xml代码：

<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/radiogroup"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:orientation="vertical" >        <RadioButton            android:id="@+id/radioButton1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:onClick="whichone"            android:text="@string/malebutton" />        <RadioButton            android:id="@+id/radioButton2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:onClick="whichone"            android:text="@string/femalebutton" />        <RadioButton            android:id="@+id/radioButton3"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:onClick="whichone"            android:text="@string/transsexualbutton" />    </RadioGroup>    <CheckBox        android:id="@+id/checkBox2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/checkBox1"        android:layout_alignBottom="@+id/checkBox1"        android:layout_marginLeft="40dp"        android:layout_toRightOf="@+id/checkBox1"        android:onClick="sport"        android:text="@string/jog" />    <CheckBox        android:id="@+id/checkBox1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/radiogroup"        android:layout_below="@+id/radiogroup"        android:layout_marginTop="49dp"        android:onClick="sport"        android:text="@string/swim" />    <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_above="@+id/checkBox2"        android:layout_alignLeft="@+id/checkBox1"        android:layout_marginBottom="16dp"        android:text="@string/hobby" />        <Button        android:id="@+id/button1"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/button2"        android:layout_below="@+id/checkBox2"        android:layout_marginTop="29dp"        android:onClick="confirminf"        android:text="@string/confirmbutton" />        <Button        android:id="@+id/button2"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/checkBox1"        android:layout_below="@+id/checkBox2"        android:layout_marginTop="86dp"        android:onClick="exitprogram"        android:text="@string/exitbutton" /></RelativeLayout>

注意：

使用xml布局文件编写控件操作时，一定要在.java函数参数设为View view

public void exitprogram(View view) {System.exit(0);}