Android腾讯微博客户端开发1:在下方的Tab的实现

Android腾讯微博客户端开发一:在下方的Tab的实现
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下面的是res下drawable文件夹下的一个selector文件，作用主要是当每一个tab选项被点击，获得焦点以及被选中的时候背景都会发生变化

<?xml version="1.0" encoding="UTF-8"?><selector  xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_focused="false" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/tab_timeline_normal" /></span>    <item android:state_focused="false" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/tab_timeline_active" /></span>    <item android:state_focused="true" android:state_selected="false" android:state_pressed="false" android:drawable="@drawable/tab_timeline_normal" /></span>    <item android:state_focused="true" android:state_selected="true" android:state_pressed="false" android:drawable="@drawable/tab_timeline_active" /></span>    <item android:state_pressed="true" android:drawable="@drawable/tab_timeline_normal" /></span></selector>

注意一定要继承TabActivity

public class MainActivity extends TabActivity {private TabHost tabHost;private RadioGroup mainbtGroup;private static final String HOME = "主页";private static final String REFER = "提及";private static final String SECRET = "私信";private static final String SEARCH = "搜索";private static final String ATTENTIION = "关注";@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.tabhost);//设置选项卡使用的布局文件tabHost = this.getTabHost();View view1 = View.inflate(MainActivity.this, R.layout.tab, null);((ImageView) view1.findViewById(R.id.tab_imageview_icon)).setImageResource(R.drawable.tab_timeline_selector);//设置每一个tab的图标((TextView) view1.findViewById(R.id.tab_textview_title)).setText(HOME);TabHost.TabSpec spec1 = tabHost.newTabSpec(HOME).setIndicator(view1).setContent(new Intent(this, HomeTimeLineActivity.class));tabHost.addTab(spec1);View view2 = View.inflate(MainActivity.this, R.layout.tab, null);((ImageView) view2.findViewById(R.id.tab_imageview_icon)).setImageResource(R.drawable.tab_atme_selector);((TextView) view2.findViewById(R.id.tab_textview_title)).setText(REFER);TabHost.TabSpec spec2 = tabHost.newTabSpec(REFER).setIndicator(view2).setContent(new Intent(this, ReferActivity.class));tabHost.addTab(spec2);View view3 = View.inflate(MainActivity.this, R.layout.tab, null);((ImageView) view3.findViewById(R.id.tab_imageview_icon)).setImageResource(R.drawable.tab_message_selector);((TextView) view3.findViewById(R.id.tab_textview_title)).setText(SECRET);TabHost.TabSpec spec3 = tabHost.newTabSpec(SECRET).setIndicator(view3).setContent(new Intent(this, MessageActivity.class));tabHost.addTab(spec3);View view4 = View.inflate(MainActivity.this, R.layout.tab, null);((ImageView) view4.findViewById(R.id.tab_imageview_icon)).setImageResource(R.drawable.tab_explore_selector);((TextView) view4.findViewById(R.id.tab_textview_title)).setText(SEARCH);TabHost.TabSpec spec4 = tabHost.newTabSpec(SEARCH).setIndicator(view4).setContent(new Intent(this, SearchActivity.class));tabHost.addTab(spec4);View view5 = View.inflate(MainActivity.this, R.layout.tab, null);((ImageView) view5.findViewById(R.id.tab_imageview_icon)).setImageResource(R.drawable.tab_focus_selector);((TextView) view5.findViewById(R.id.tab_textview_title)).setText(ATTENTIION);TabHost.TabSpec spec5 = tabHost.newTabSpec(ATTENTIION).setIndicator(view5).setContent(new Intent(this, AttentionActivity.class));tabHost.addTab(spec5);}

下面的就是tabhost布局文件关键是tabhost，tabcontent和tabs这三个id一定要正确

<?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"><RelativeLayout 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="fill_parent" /><TabWidget android:id="@android:id/tabs" <span style="background-color: #ff0000;">android:background="@drawable/tab_bkg"</span> android:fadingEdge="none"android:fadingEdgeLength="0.0px" android:layout_width="fill_parent"android:layout_height="wrap_content"android:layout_alignParentBottom="true" /></RelativeLayout></TabHost>

android:layout_alignParentBottom="true" 把tab的五个按钮挨着父控件的底部，在android里面RelativeLayout很好用

下面的是每一个tab项的布局文件上面是图片下面是文字

<?xml version="1.0" encoding="UTF-8"?><LinearLayout android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content"  xmlns:android="http://schemas.android.com/apk/res/android">    <ImageView android:id="@+id/tab_imageview_icon" android:layout_width="fill_parent" android:layout_height="32.0dip" android:scaleType="fitCenter" />    <TextView android:id="@+id/tab_textview_title" android:textSize="11.0sp"  android:ellipsize="marquee" android:gravity="center" android:layout_width="fill_parent" android:layout_height="wrap_content" android:singleLine="true" android:marqueeRepeatLimit="1" /></LinearLayout>

是一张.9.png格式的图片，这个很有用哟在android里，经常用来处理图片拉升的问题。左边和上面的小点表示要拉伸的地方，右边和下面的表示内容区。关于.9.png格式图片在android里面得更多应用看http://developer.android.com/guide/developing/tools/draw9patch.html


6 楼 zixuefei 2011-09-17   很好，值得学习下 7 楼 294460620 2011-11-03   哥们排版跟不上内容，看下来好费劲你这文章 8 楼 helloandroid 2011-11-03   294460620 写道哥们排版跟不上内容，看下来好费劲你这文章
呵呵，是的，刚才自己看了一下的确很费劲（这贴是在iteye发的第一帖，当时不太熟悉这编辑器），中午刚修改了一下，现在好多了 9 楼 egox 2012-02-15   哥们， 能详细介绍一下 .9.png 怎么用么？？ 10 楼 egox 2012-02-15   代码里 “</span>” 应该是改排版留下的吧 呵呵 11 楼 wenlong200817 19 小时前   厉害，学习下！！！