Android 中ActionBar+fragment实现页面导航的实例

2019-12-12 02:02:34

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Android 中ActionBar+fragment实现页面导航的实例

为保证android2.0以上均能运行，使用support.v7库下的actionbar及fragment

继承自AppCompatActivity（ActionBarActivity已过时）使用getSupportActionBar()得到ActionBar，

ActionBar.Tab，这里Tab必须设置监听，在监听中实现Fragment的切换。

这里重点提一下，Theme主题一定要适配，因为我使用的是AppCompatActivity所以，

android:theme="@style/Theme.AppCompat.Light"

如果不用AppCompatActivity一定要注意使用相应的主题适配，否则会getActionBar/getSupportActionbar的时候拿不到东西，空指针报错

<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:paddingLeft="@dimen/activity_horizontal_margin"   android:paddingRight="@dimen/activity_horizontal_margin"   android:paddingTop="@dimen/activity_vertical_margin"   android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">    <FrameLayout     android:id="@+id/context"     android:layout_width="match_parent"     android:layout_height="match_parent"/>  </RelativeLayout>

package com.example.yasin.actionbarusing;   import android.app.Activity; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentTransaction; import android.support.v7.app.ActionBar; import android.support.v7.app.ActionBarActivity; import android.support.v7.app.AppCompatActivity; import android.util.Log; import android.view.View;   public class MainActivity extends AppCompatActivity {    ActionBar actionBar;   @Override   protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);      actionBar = getSupportActionBar();     actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);      ActionBar.Tab tab1 = actionBar.newTab().setText("Tab1");     tab1.setTabListener(new MyTabListener(new Fragment1()));     ActionBar.Tab tab2 = actionBar.newTab().setText("Tab2");     tab2.setTabListener(new MyTabListener(new Fragment2()));     actionBar.addTab(tab1);     actionBar.addTab(tab2);   }    class MyTabListener implements ActionBar.TabListener{      private Fragment fragment;     public MyTabListener (Fragment fragment){       this.fragment=fragment;     }       @Override     public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {       ft.replace(R.id.context,fragment);     }      @Override     public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {      }      @Override     public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {       //ft.remove(fragment);     }   }  }

<?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">    <TextView     android:id="@+id/tv1"     android:text="fragment1"     android:layout_width="wrap_content"     android:layout_height="wrap_content" />  </LinearLayout>

package com.example.yasin.actionbarusing;  import android.os.Bundle; import android.support.annotation.Nullable; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup;  /**  * Created by Yasin on 2016/1/3.  */ public class Fragment1 extends Fragment{   @Nullable   @Override   public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {     View view = inflater.inflate(R.layout.fragment1,container,false);      return view;   } }

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android"   package="com.example.yasin.actionbarusing" >    <application     android:allowBackup="true"     android:icon="@mipmap/ic_launcher"     android:label="@string/app_name"     android:theme="@style/Theme.AppCompat.Light" >     <activity       android:name=".MainActivity"       android:label="@string/app_name" >       <intent-filter>         <action android:name="android.intent.action.MAIN" />          <category android:name="android.intent.category.LAUNCHER" />       </intent-filter>     </activity>   </application>  </manifest>

效果图：