今天没什么事情,所以研究了一下,微信的Tab效果。效果比较粗糙,朋友们先凑合着看,后面有时间会优化。
基本就是点击下面的tab,就会切换到不同的fragment。
main_activity.xml
<?xml version="1.0" encoding="UTF-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <FrameLayout android:id="@+id/fragments" android:layout_width="match_parent" android:layout_height="wrap_content" /> <TabHost android:id="@android:id/tabhost" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentBottom="true"> <!-- TabWidget管理所有的选项卡,id名是android指定的 --> <TabWidget android:id="@android:id/tabs" android:layout_width="fill_parent" android:layout_height="fill_parent" android:visibility="gone" /> <FrameLayout android:id="@android:id/tabcontent" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#FFF"> <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <LinearLayout android:id="@+id/tab1" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:clickable="true" android:orientation="vertical"> <ImageButton android:id="@+id/tab_ib1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/tab_weixin_selector" android:clickable="false" /> <TextView android:id="@+id/tab_tv1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="微信" android:textColor="#999999" /> </LinearLayout> <LinearLayout android:id="@+id/tab2" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:clickable="true" android:orientation="vertical"> <ImageButton android:id="@+id/tab_ib2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/tab_adress_selector" android:clickable="false" /> <TextView android:id="@+id/tab_tv2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="通讯录" android:textColor="#999999" /> </LinearLayout> <LinearLayout android:id="@+id/tab3" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:orientation="vertical"> <ImageButton android:id="@+id/tab_ib3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/tab_find_selector" /> <TextView android:id="@+id/tab_tv3" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="发现" android:textColor="#999999" /> </LinearLayout> <LinearLayout android:id="@+id/tab4" android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:orientation="vertical"> <ImageButton android:id="@+id/tab_ib4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/tab_settings_selector" /> <TextView android:id="@+id/tab_tv4" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="设置" android:textColor="#999999" /> </LinearLayout> </LinearLayout> </FrameLayout> </TabHost> </RelativeLayout>这里xml需要格外注意:1、TabHost必须引用 android:id="@android:id/tabhost",否则将会报如下错误:
2、TabWidget和FrameLayout同样是要引用系统的。
Caused by: java.lang.RuntimeException: Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'
第二个问题:TabHost里面的布局文件,必须是写在FrameLayout里面的否则将会报 java.lang.NullPointerException
MainActivity:
package com.example.fragmentdemo; import android.app.FragmentManager; import android.app.TabActivity; import android.graphics.Color; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.widget.ImageButton; import android.widget.LinearLayout; import android.widget.TabHost; import android.widget.TextView; public class MainActivity extends TabActivity { private TabHost tabhost; private LinearLayout tab1, tab2, tab3, tab4; private ImageButton tab_ib1, tab_ib2, tab_ib3, tab_ib4; private TextView tab_tv1, tab_tv2, tab_tv3, tab_tv4; private FragmentManager fm; private Fragment1 fragment1; private Fragment2 fragment2; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.activity_main); fm = getFragmentManager(); tabhost = getTabHost(); tab1 = (LinearLayout) findViewById(R.id.tab1); tab2 = (LinearLayout) findViewById(R.id.tab2); tab_ib1 = (ImageButton) findViewById(R.id.tab_ib1); tab_ib2 = (ImageButton) findViewById(R.id.tab_ib2); tab_tv1 = (TextView) findViewById(R.id.tab_tv1); tab_tv2 = (TextView) findViewById(R.id.tab_tv2); tab1.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { tabhost.setCurrentTabByTag("frist"); tab_ib1.setClickable(true); tab_ib1.setSelected(true); tab_tv1.setTextColor(Color.parseColor("#14be0a")); fragment1 = new Fragment1(); fm.beginTransaction().replace(R.id.fragments, fragment1) .commit(); } }); tab2.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { tabhost.setCurrentTabByTag("second"); tab_ib2.setClickable(true); tab_ib2.setSelected(true); tab_tv2.setTextColor(Color.parseColor("#14be0a")); fragment2 = new Fragment2(); fm.beginTransaction().replace(R.id.fragments, fragment2) .commit(); } }); tabhost.addTab(tabhost.newTabSpec("frist").setIndicator("微信") .setContent(R.id.tab1)); tabhost.addTab(tabhost.newTabSpec("second").setIndicator("通讯录") .setContent(R.id.tab2)); } }代码就这么简单。温馨提示一下,由于我上面用的是ImageButton所以导致效果非常差,如果使用RadioButton,效果会好看很多的。这是第一种方式,相对比较复杂一些。而且出错率比较高,当然功能更强大。
下面我们说一下,方法二:直接用Android提供的FragmentTabHost
activity.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" > <FrameLayout android:id="@+id/frame" android:layout_width="match_parent" android:layout_height="0dp" android:layout_weight="4.0" /> <android.support.v4.app.FragmentTabHost android:id="@+id/fragmenttabhost" android:layout_width="match_parent" android:layout_height="0dp" android:layout_alignParentBottom="true" android:layout_weight="1.0" /> </LinearLayout>activity.class
package com.example.fragmentdemo; import java.util.List; import android.os.Bundle; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentTabHost; import android.view.Window; import android.widget.TabHost.TabSpec; public class Activity extends FragmentActivity { private FragmentTabHost fth; private List<Class> fragments; @Override protected void onCreate(Bundle arg0) { super.onCreate(arg0); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.mainactivity); fth=(FragmentTabHost) findViewById(R.id.fragmenttabhost); fth.setup(this, getSupportFragmentManager(),R.id.frame); /* TabSpec ts1=fth.newTabSpec("frist").setIndicator("微信", getResources().getDrawable(R.drawable.tab_weixin_normal)); TabSpec ts2=fth.newTabSpec("second").setIndicator("通讯录", getResources().getDrawable(R.drawable.tab_address_normal));*/ TabSpec ts3=fth.newTabSpec("three").setIndicator("发现", getResources().getDrawable(R.drawable.tab_find_frd_normal)); TabSpec ts4=fth.newTabSpec("four").setIndicator("设置", getResources().getDrawable(R.drawable.tab_settings_normal)); /* fth.addTab(ts1,new Fragment1().getClass(), null); fth.addTab(ts2,new Fragment2().getClass(), null);*/ fth.addTab(ts3,new Fragment3().getClass(), null); fth.addTab(ts4,new Fragment4().getClass(), null); } }代码相对简单很多,但是效果也很简陋,不能实现选中之后的效果。