现在安卓比较流行的布局就是类似新闻客户端和手机QQ那种的底端可选择,上面的个别页面可以滑动选择。
在测试过程中发现用安卓自带的TabHost去构建,很难得到自定义的效果。
因此采用TabHost+ViewPager+RadioGroup去构建这个效果
首先要弄清楚各自的用途和功能
(1)TabHost
由于安卓自带的TabHost貌似在有些手机版本上只能固定在底端的位置,所以我们用GadioGroup去显示界面按钮,由于构建HabHost必须定义host、tabs、content几个内容,这样我们隐藏tabs,用GadioGroup代替显示。代码如下:
<TabHost xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" <span style="color:#ff0000;"> android:id="@android:id/tabhost" </span> android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.android_mode.MainActivity" > <LinearLayout android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <FrameLayout <span style="color:#ff0000;">android:id="@android:id/tabcontent"</span> android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1" > </FrameLayout> <TabWidget <span style="color:#ff0000;">android:id="@android:id/tabs"</span> android:layout_width="fill_parent" android:layout_height="wrap_content" <span style="color:#000066;">android:visibility="gone"</span> > </TabWidget> <RadioGroup android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <RadioButton android:id="@+id/b1" android:layout_width="wrap_content" android:layout_height="40dp" android:layout_weight="1" android:background="#00ABCD" android:button="@null" android:gravity="center" android:text="首页" /> <View android:layout_width="2px" android:layout_height="fill_parent" /> <RadioButton android:id="@+id/b2" android:layout_width="wrap_content" android:layout_height="40dp" android:layout_weight="1" android:background="#00ABCD" android:button="@null" android:gravity="center" android:text="设置" /> </RadioGroup> </LinearLayout> </TabHost>
对于主文件,由于在安卓3.0版本以下不支持TabActivity,因此我们考虑到兼容性,选用ActivityGroup。
其具体方法如下所示:
public class MyTabOwnAct extends ActivityGroup { RadioButton radioButton1; RadioButton radioButton2; TabHost tabHost; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.tabmain); tabHost = (TabHost) findViewById(android.R.id.tabhost); tabHost.setup(); tabHost.setup(this.getLocalActivityManager()); //必须要又这个语句,如果继承TabActivity可不要 tabHost.addTab(tabHost.newTabSpec("l1") .setContent(new Intent(this, Act1.class)).setIndicator("首页")); tabHost.addTab(tabHost.newTabSpec("l2") .setContent(new Intent(this, Act2.class)).setIndicator("设置")); radioButton1 = (RadioButton) findViewById(R.id.b1); radioButton2 = (RadioButton) findViewById(R.id.b2); radioButton1.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub tabHost.setCurrentTabByTag("l1"); //显示与隐藏的标记 } }); radioButton2.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { // TODO Auto-generated method stub tabHost.setCurrentTabByTag("l2"); } }); } }
到目前为止我们把底部的效果实现,即可以通过下面的按钮,改变上面的界面。
接下来我们选择上面其中的一个界面,用ViewPager实现滑动的效果。
界面布局文件如下:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:orientation="horizontal" > <TextView android:layout_width="wrap_content" android:layout_height="40dp" android:layout_weight="1" android:background="#FF0fab" android:gravity="center" android:text="页面一" /> <View android:layout_width="2dp" android:layout_height="fill_parent" /> <TextView android:layout_width="wrap_content" android:layout_height="40dp" android:layout_weight="1" android:background="#da0ccb" android:gravity="center" android:text="页面二" /> <View android:layout_width="2dp" android:layout_height="fill_parent" /> <TextView android:layout_width="wrap_content" android:layout_height="40dp" android:layout_weight="1" android:background="#eeffff" android:gravity="center" android:text="页面三" /> </LinearLayout> <android.support.v4.view.ViewPager android:id="@+id/pager" android:layout_width="fill_parent" android:layout_height="fill_parent" > </android.support.v4.view.ViewPager> </LinearLayout>
</pre><span style="font-size:18px">我们要准备三个界面的布局,这里我分别命名为p1.xml,p2.xml,p3.xml,然后我们在主文件中通过得到ViewPager后关联到适配器,即可得到滑动的效果。</span><pre name="code" class="java"><span style="font-family: Arial, Helvetica, sans-serif;">public class Act1 extends Activity {</span>
ViewPager pager; @Override protected void onCreate(Bundle savedInstanceState) { // TODO Auto-generated method stub super.onCreate(savedInstanceState); setContentView(R.layout.pager); pager = (ViewPager) findViewById(R.id.pager); pager.setAdapter(new MyPagerAdapter()); } class MyPagerAdapter extends PagerAdapter { List<View> list = new ArrayList<View>(); public MyPagerAdapter() { // TODO Auto-generated constructor stub View view1 = LayoutInflater.from(getApplicationContext()).inflate( R.layout.p1, null); View view2 = LayoutInflater.from(getApplicationContext()).inflate( R.layout.p2, null); View view3 = LayoutInflater.from(getApplicationContext()).inflate( R.layout.p3, null); list.add(view1); list.add(view2); list.add(view3); } @Override public Object instantiateItem(ViewGroup container, int position) { // TODO Auto-generated method stub ((ViewPager) container).addView(list.get(position)); return list.get(position); } @Override public void destroyItem(ViewGroup container, int position, Object object) { // TODO Auto-generated method stub // super.destroyItem(container, position, object); ((ViewPager) container).removeView(list.get(position));///(position);// (list.get(position)); } @Override public int getCount() { // TODO Auto-generated method stub return list.size(); } @Override public boolean isViewFromObject(View arg0, Object arg1) { // TODO Auto-generated method stub return arg0 == arg1; } } }
效果显示图:
时间: 2024-10-26 18:22:48