<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_checked="false"
android:drawable="@drawable/tabswitcher_long" />
<item
android:state_checked="true"
android:drawable="@drawable/tabswitcher_short" />
</selector>
<RadioGroup
android:gravity="center"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
<RadioButton
android:id="@+id/btn_0"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="最新信息"
android:textSize="17.0sp"
android:textColor="@android:color/black"
android:gravity="center"
android:layout_weight="1"
android:checked="true"
android:button="@null"
android:background="@drawable/radio"
/>
<RadioButton
android:id="@+id/btn_1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="在线专家"
android:textSize="17.0sp"
android:textColor="@android:color/black"
android:gravity="center"
android:layout_weight="1"
android:button="@null"
android:background="@drawable/radio"
/>
<RadioButton
android:id="@+id/btn_2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="预约服务"
android:textSize="17.0sp"
android:textColor="@android:color/black"
android:gravity="center"
android:layout_weight="1"
android:button="@null"
android:background="@drawable/radio"
/>
</RadioGroup>
文字旁边有图标的怎么办?
也很简单啦,只要在每个RadioButton上加android:drawableLeft="@drawable/tubiao_0"就可以了。
另外要设置图标与文字的距离怎么办?
有一个方法setCompoundDrawablePadding(pad)可以设置图标与文字的距离,对应的属性为android:drawablePadding。
原文地址:http://www.iteye.com/topic/1116261#2256664
在android中实现菜单功能有多种方法。
Options Menu:用户按下menu Button时显示的菜单。
Context Menu:用户长时间按下屏幕,所显示出来的菜单也称为上下文菜单。
Submenu:子菜单。
但是有时候这些内置的菜单并不能满足我们功能,这就需要自己自定义一种菜单。接下来我说的这种就是通过TabHost与RadioGroup结合完成的菜单。这也是很常用的一种底部菜单做法。先上图:
首先看布局文件:
<?xml version="1.0" encoding="UTF-8"?>
<TabHost android:id="@android:id/tabhost" android:layout_width="fill_parent" android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<FrameLayout
android:id="@android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="0.0dip"
android:layout_weight="1.0" />
<TabWidget
android:id="@android:id/tabs"
android:visibility="gone"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0.0" />
<RadioGroup
android:gravity="center_vertical"
android:layout_gravity="bottom"
android:orientation="horizontal"
android:id="@+id/main_radio"
android:background="@drawable/maintab_toolbar_bg"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<RadioButton
android:id="@+id/radio_button0"
android:tag="radio_button0"
android:layout_marginTop="2.0dip"
android:text="@string/alarm"
android:drawableTop="@drawable/icon_1"
style="@style/main_tab_bottom" />
<RadioButton
android:id="@+id/radio_button1"
android:tag="radio_button1"
android:layout_marginTop="2.0dip"
android:text="@string/message"
android:drawableTop="@drawable/icon_2"
style="@style/main_tab_bottom" />
<RadioButton
android:id="@+id/radio_button2"
android:tag="radio_button2"
android:layout_marginTop="2.0dip"
android:text="@string/photo"
android:drawableTop="@drawable/icon_3"
style="@style/main_tab_bottom" />
<RadioButton
android:id="@+id/radio_button3"
android:tag="radio_button3"
android:layout_marginTop="2.0dip"
android:text="@string/music"
android:drawableTop="@drawable/icon_4"
style="@style/main_tab_bottom" />
<RadioButton
android:id="@+id/radio_button4"
android:tag="radio_button4"
android:layout_marginTop="2.0dip"
android:text="@string/setting"
android:drawableTop="@drawable/icon_5"
style="@style/main_tab_bottom" />
</RadioGroup>
</LinearLayout>
</TabHost>
需要注意的是,如果用TabHost这个控件,其中有几个ID是必须这么写的,android:id="@android:id/tabhost ;android:id="@android:id/tabcontent" ;android:id="@android:id/tabs" ;之所以要这么写是因为在TabHost这个类中。需要实例化上述这个ID的控件。看源码:
在TabActivity中有么个方法:
public void onContentChanged() {
super.onContentChanged();
mTabHost = (TabHost) findViewById(com.android.internal.R.id.tabhost);
if (mTabHost == null) {
throw new RuntimeException(
"Your content must have a TabHost whose id attribute is " +
"'android.R.id.tabhost'");
}
mTabHost.setup(getLocalActivityManager());
}
private void ensureTabHost() {
if (mTabHost == null) {
this.setContentView(com.android.internal.R.layout.tab_content);
}
}
当内容发生改变时它会调用这个方法,来更新列表或者其他视图,而这个方法中需要实例化TabHost,所以必须通过ID为tabhost实例化。
再看看TabHost这个类中,
public void setup() {
mTabWidget = (TabWidget) findViewById(com.android.internal.R.id.tabs);
if (mTabWidget == null) {
throw new RuntimeException(
"Your TabHost must have a TabWidget whose id attribute is 'android.R.id.tabs'");
}
// KeyListener to attach to all tabs. Detects non-navigation keys
// and relays them to the tab content.
mTabKeyListener = new OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
switch (keyCode) {
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_DPAD_LEFT:
case KeyEvent.KEYCODE_DPAD_RIGHT:
case KeyEvent.KEYCODE_DPAD_UP:
case KeyEvent.KEYCODE_DPAD_DOWN:
case KeyEvent.KEYCODE_ENTER:
return false;
}
mTabContent.requestFocus(View.FOCUS_FORWARD);
return mTabContent.dispatchKeyEvent(event);
}
};
mTabWidget.setTabSelectionListener(new TabWidget.OnTabSelectionChanged() {
public void onTabSelectionChanged(int tabIndex, boolean clicked) {
setCurrentTab(tabIndex);
if (clicked) {
mTabContent.requestFocus(View.FOCUS_FORWARD);
}
}
});
mTabContent = (FrameLayout) findViewById(com.android.internal.R.id.tabcontent);
if (mTabContent == null) {
throw new RuntimeException(
"Your TabHost must have a FrameLayout whose id attribute is "
+ "'android.R.id.tabcontent'");
}
}
这个方法,是在增加选项卡之前由系统调用。在这个方法中需要通过tabs 这个ID实例化一个TabWidget,通过tabcontent这个ID实例化一个FrameLayout,用来放置选项卡内容。所以这两个ID也是固定的。
在上述布局文件中隐藏了系统默认的Widget,取而代之的是带有图片的Button。
看一下主要代码:
package com.iteye.androidtoast;
import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.TabHost;
public class MainActivity extends TabActivity implements OnCheckedChangeListener{
/** Called when the activity is first created. */
private TabHost mHost;
private RadioGroup radioderGroup;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.maintabs);
//实例化TabHost
mHost=this.getTabHost();
//添加选项卡
mHost.addTab(mHost.newTabSpec("ONE").setIndicator("ONE")
.setContent(new Intent(this,OneActivity.class)));
mHost.addTab(mHost.newTabSpec("TWO").setIndicator("TWO")
.setContent(new Intent(this,TwoActivity.class)));
mHost.addTab(mHost.newTabSpec("THREE").setIndicator("THREE")
.setContent(new Intent(this,ThreeActivity.class)));
mHost.addTab(mHost.newTabSpec("FOUR").setIndicator("FOUR")
.setContent(new Intent(this,FourActivity.class)));
mHost.addTab(mHost.newTabSpec("FIVE").setIndicator("FIVE")
.setContent(new Intent(this,FiveActivity.class)));
radioderGroup = (RadioGroup) findViewById(R.id.main_radio);
radioderGroup.setOnCheckedChangeListener(this);
}
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {
switch(checkedId){
case R.id.radio_button0:
mHost.setCurrentTabByTag("ONE");
break;
case R.id.radio_button1:
mHost.setCurrentTabByTag("TWO");
break;
case R.id.radio_button2:
mHost.setCurrentTabByTag("THREE");
break;
case R.id.radio_button3:
mHost.setCurrentTabByTag("FOUR");
break;
case R.id.radio_button4:
mHost.setCurrentTabByTag("FIVE");
break;
}
}
}
原文地址:
通过代码设置radiobutton不同方位图标的两种方法
更换radiobutton中的图片在xml中很好设置,但对于初学者如何在代码中设置还是不容易找的。没法子,通过看原版api找到两个方法,setCompoundDrawables和setCompoundDrawablesWithIntrinsicBounds。
下面交给大家方法。
setCompoundDrawablesWithIntrinsicBounds(Drawable left, Drawable top, Drawable right, Drawable bottom)
api原文为:
Sets the Drawables (if any) to appear to the left of, above, to the right of, and below the text. Use null if you do not want a Drawable there. The Drawables' bounds will be set to their intrinsic bounds. 意思大概就是:可以在上、下、左、右设置图标,如果不想在某个地方显示,则设置为null。图标的宽高将会设置为固有宽高,既自动通过getIntrinsicWidth和getIntrinsicHeight获取。——笔者翻译 |
button = (RadioButton) group.getChildAt(i);
2 Resources res = TabTest.this.getResources();
3 Drawable myImage = res.getDrawable(R.drawable.home);
4 button.setCompoundDrawablesWithIntrinsicBounds(null, myImage, null, null);
如图第一个按钮:
setCompoundDrawables(Drawable left, Drawable top, Drawable right, Drawable bottom)
api原文为:
Sets the Drawables (if any) to appear to the left of, above, to the right of, and below the text. Use null if you do not want a Drawable there. The Drawables must already have had 意思大概就是:可以在上、下、左、右设置图标,如果不想在某个地方显示,则设置为null。但是Drawable必须已经setBounds(Rect)。意思是你要添加的资源必须已经设置过初始位置、宽和高等信息。——笔者翻译 |
这下就明白了,这个方法要先给Drawable设置setBounds(x,y,width,height);
x:组件在容器X轴上的起点 y:组件在容器Y轴上的起点 width:组件的长度 height:组件的高度。
如代码:
1 Resources res = TabTest.this.getResources();
2 Drawable myImage = res.getDrawable(R.drawable.home);
3 myImage.setBounds(1, 1, 100, 100);
4 button.setCompoundDrawables(null, myImage, null, null);
不按比例,宽高可以打破原有的大小及比例!如图,我调的y轴有点不对齐。
setCompoundDrawables,事先要给Drawable设置setBounds。
setCompoundDrawablesWithIntrinsicBounds