常用控件 二

这里我介绍一下RadioGroup和RadioButton ,CheckBox,Toast 的用法

Toast就是小的提示信息的浮动框，过一段时间会消失的那种，在市面上应用还是比较多的。

需要提一下的是今天我在调试代码的时候IDE老是报错，经过反复查看代码都没有查出有任何问题，最后在查看布局文件时采用了绘图布局窗口查看时，看到了明显的XML文件的错误提示消息，这个技巧在以后编写代码时应该反复使用，避免这种不必要的错误

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="hello" />

    <RadioGroup
        android:id="@+id/genderGroup"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <RadioButton
            android:id="@+id/female"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="female" />

        <RadioButton
            android:id="@+id/male"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="male" />
    </RadioGroup>

    <CheckBox
        android:id="@+id/swim"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="swim" />

    <CheckBox
        android:id="@+id/run"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="run" />

    <CheckBox
        android:id="@+id/read"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="read" />

</LinearLayout>

package com.example.helloworld;

import android.app.Activity;
import android.os.Bundle;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Toast;
import android.widget.RadioGroup.OnCheckedChangeListener;

/**
 * 常用控件 二 RadioGroup和RadioButton ,CheckBox,Toast(弹出的提示信息)
 * 
 * @author David
 * 
 */
public class NineLessonDemo1 extends Activity {

    private RadioGroup genderGroup = null;
    private RadioButton femaleButton = null;
    private RadioButton maleButton = null;
    private CheckBox swimBox = null;
    private CheckBox runBox = null;
    private CheckBox readBox = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.nine);
        genderGroup = (RadioGroup) this.findViewById(R.id.genderGroup);
        femaleButton = (RadioButton) this.findViewById(R.id.female);
        maleButton = (RadioButton) this.findViewById(R.id.male);
        swimBox = (CheckBox) this.findViewById(R.id.swim);
        runBox = (CheckBox) this.findViewById(R.id.run);
        readBox = (CheckBox) this.findViewById(R.id.read);
        genderGroup.setOnCheckedChangeListener(new MyRadioButtonListener());
        // checkbox需要为每一个这样的对象分别添加一次
        swimBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                // TODO Auto-generated method stub
                if (isChecked) {
                    System.out.println("swim is checked");

                } else {

                    System.out.println("swim is unchecked");
                }
            }
        });
        runBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                // TODO Auto-generated method stub
                if (isChecked) {
                    System.out.println("run is checked");

                } else {

                    System.out.println("run is unchecked");
                }
            }
        });
        readBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            public void onCheckedChanged(CompoundButton buttonView,
                    boolean isChecked) {
                // TODO Auto-generated method stub
                if (isChecked) {
                    System.out.println("read is checked");
                } else {
                    System.out.println("read is unchecked");
                }
            }
        });
    }

    class MyRadioButtonListener implements OnCheckedChangeListener {

        public void onCheckedChanged(RadioGroup arg0, int arg1) {
            // TODO Auto-generated method stub
            if (femaleButton.getId() == arg1) {
                System.out.println("female");
                Toast.makeText(NineLessonDemo1.this, "female",
                        Toast.LENGTH_SHORT).show();
            } else {
                System.out.println("male");

            }
        }

    }

}