android笔记6-常用控件的介绍二

单选按钮的使用

一个常用的公共方法

Public void toggle()

这里用了button处理事件的另一种方法：在xml布局文件中通过android:onclick = "selfDestruct" 来完成。

<?xml version="1.0" encoding="utf-8"?>
<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:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="单选按钮的使用" />
<RadioGroup
android:id="@+id/rg"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
>

<RadioButton
android:id="@+id/radioButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="男" />
<RadioButton
android:id="@+id/radioButton2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="女" />
</RadioGroup>

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="selfDestrut"
android:text="选择性别" />

</LinearLayout>

public class Android_radio1Activity extends Activity
{
/** Called when the activity is first created. */
private Button button;
private RadioGroup group;

@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// button = (Button)this.findViewById(R.id.button1);
group = (RadioGroup)this.findViewById(R.id.rg);

}

public void selfDestrut(View view)
{
int len = group.getChildCount();
String msg = "";
for(int i = 0 ; i < len ; i++)
{
RadioButton rb = (RadioButton)group.getChildAt(i);
if(rb.isChecked())
{
msg = rb.getText().toString();
break;
}
}
Toast.makeText(Android_radio1Activity.this, msg, 1).show();//设置为显示1秒
}
}

开关按钮的使用

Java代码中的实现

用开关按钮实现两种排列方式的转换

java代码中对垂直/水平布局的设置

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<ToggleButton
android:id="@+id/tog"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:textOff="横向排列"
android:textOn="纵向排列" />

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/mylayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button1" />

<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button2" />

<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button3" />
</LinearLayout>

</LinearLayout>

public class Main extends Activity
{
/** Called when the activity is first created. */
private ToggleButton tb;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tb = (ToggleButton)this.findViewById(R.id.tog);
final LinearLayout linearLayout = (LinearLayout)this.findViewById(R.id.mylayout);
tb.setOnCheckedChangeListener(new OnCheckedChangeListener()
{

@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
{
// TODO Auto-generated method stub
if(isChecked)
{
linearLayout.setOrientation(1);//表示设置垂直布局
}
else linearLayout.setOrientation(0);
}
});
}
}