标签:android menu 动态切换 fragment actionbar
2.1 因为此处我有3个样式,那么我需要在res/menu 文件夹下创建三个文件,style1.xml,style2.xml,style3.xml.这里我以style1.xml为例,具体的文字图标文件可按照需求,style2.xml,style3.xml类似。
style1.xml 源码如下:
<menu xmlns:android="http://schemas.android.com/apk/res/android" > <item android:id="@+id/action_item1" android:orderInCategory="100" android:showAsAction="ifRoom|withText" android:icon="@drawable/ic_menu_discard" android:title="@string/style1"/> </menu>
activity_main.xml源码
<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:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".MainActivity" > <android.support.v4.view.ViewPager android:id="@+id/viewpager" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" > </android.support.v4.view.ViewPager> </RelativeLayout>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="第一个Fragment" /> </RelativeLayout>
FirstFragment源码:
package com.yqc.menuswitchdemo; import android.os.Bundle; import android.support.v4.app.Fragment; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; public class FirstFragment extends Fragment { @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { View rootView = inflater.inflate(R.layout.fragment_first, container, false); return rootView; } }
其中,在使用Fragment时需要一个自定义适配器,源码如下:
package com.yqc.menuswitchdemo; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; public class LFFragmentPagerAdapter extends FragmentPagerAdapter { Fragment[] fragmentArray; public LFFragmentPagerAdapter(FragmentManager fm,Fragment[] fragmentArray2) { super(fm); // TODO Auto-generated constructor stub if (null == fragmentArray2) { this.fragmentArray = new Fragment[] {}; } else { this.fragmentArray = fragmentArray2; } } @Override public Fragment getItem(int arg0) { // TODO Auto-generated method stub return fragmentArray[arg0]; } @Override public int getCount() { // TODO Auto-generated method stub return fragmentArray.length; } }
package com.yqc.menuswitchdemo; import android.os.Bundle; import android.app.ActionBar; import android.app.ActionBar.Tab; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.view.ViewPager; import android.support.v4.view.ViewPager.OnPageChangeListener; import android.view.Menu; import android.view.MenuInflater; import android.view.MenuItem; import android.widget.Toast; /** * @author YangQiCong 杨奇聪 QQ群 90733929 欢迎交流 */ public class MainActivity extends FragmentActivity { private ViewPager viewPager; private ActionBar actionBar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); viewPager = (ViewPager) findViewById(R.id.viewpager); Fragment fragment1 = new FirstFragment(); Fragment fragment2 = new SecondFragment(); Fragment fragment3 = new ThirdFragment(); Fragment[] fragmentArray = new Fragment[] { fragment1, fragment2, fragment3 }; LFFragmentPagerAdapter adapter = new LFFragmentPagerAdapter( getSupportFragmentManager(), fragmentArray); viewPager.setAdapter(adapter); viewPager.setOffscreenPageLimit(3); viewPager.setOnPageChangeListener(new OnPageChangeListener() { @Override public void onPageSelected(int arg0) { // TODO Auto-generated method stub System.out.println("arg0:" + arg0); actionBar.setSelectedNavigationItem(arg0); } @Override public void onPageScrolled(int arg0, float arg1, int arg2) { // TODO Auto-generated method stub } @Override public void onPageScrollStateChanged(int arg0) { // TODO Auto-generated method stub } }); actionBar = getActionBar(); // 设置ActionBar 的导航方式: Tab导航 actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); // actionBar.get Tab tab1 = actionBar.newTab().setText("页签1") .setIcon(android.R.drawable.ic_menu_agenda) .setTabListener(new ActionTabListener(fragment1)); Tab tab2 = actionBar.newTab().setText("页签2") .setIcon(android.R.drawable.ic_menu_agenda) .setTabListener(new ActionTabListener(fragment2)); Tab tab3 = actionBar.newTab().setText("页签3") .setIcon(android.R.drawable.ic_menu_agenda) .setTabListener(new ActionTabListener(fragment3)); actionBar.addTab(tab1); actionBar.addTab(tab2); actionBar.addTab(tab3); } class ActionTabListener implements ActionBar.TabListener { // 声明Fragment private Fragment fragment; // 通过构造引用对应的Fragment public ActionTabListener(Fragment fragment) { this.fragment = fragment; } @Override public void onTabReselected(Tab tab, android.app.FragmentTransaction ft) { // TODO Auto-generated method stub } @Override public void onTabSelected(Tab tab, android.app.FragmentTransaction ft) { // TODO Auto-generated method stub // ft.add(android.R.id.content, fragment, null); mType = tab.getPosition(); System.out.println("tab.getPosition():" + tab.getPosition()); viewPager.setCurrentItem(tab.getPosition()); invalidateOptionsMenu(); } @Override public void onTabUnselected(Tab tab, android.app.FragmentTransaction ft) { // TODO Auto-generated method stub } } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.style1, menu); return true; } private int mType; @Override public boolean onPrepareOptionsMenu(Menu menu) { // TODO Auto-generated method stub System.out.println("当前mType:" + mType); menu.clear(); MenuInflater inflater = this.getMenuInflater(); switch (mType) { case 0: inflater.inflate(R.menu.style1, menu); break; case 1: inflater.inflate(R.menu.style2, menu); break; case 2: inflater.inflate(R.menu.style3, menu); break; } return super.onPrepareOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub switch (item.getItemId()) { case R.id.action_item1: Toast.makeText(this, "点击了第一个按钮", Toast.LENGTH_SHORT).show(); break; case R.id.action_item2: Toast.makeText(this, "点击了第二个按钮", Toast.LENGTH_SHORT).show(); break; case R.id.action_item3: Toast.makeText(this, "点击了第三个按钮", Toast.LENGTH_SHORT).show(); break; } return super.onOptionsItemSelected(item); } }
3. 需要注意的是MainActivity主逻辑中我的mType是一个标识量,用于标识当前Fragment然后切换,如果有疑问欢迎大家一起交流
Android编程心得-使用ActionBar+Fragment+ViewPager实现动态切换Menu效果
标签:android menu 动态切换 fragment actionbar
原文地址:http://blog.csdn.net/yangqicong11/article/details/38849193