Java 这是对ActionBar的一个很好的使用吗?
所以我刚开始尝试ActionBars,因为我想支持蜂巢之前的设备,所以我决定选择ActionBar Sherlock。我扫描了一下样品,想试试看。基本上,我想要的是一个通用的ActionBar,它应该对所有活动都具有相同的功能。我只是使用ActionBar本身来浏览不同的活动。我很快就把一些东西拼凑起来了,但不知何故它感觉“脏”,有人能帮我看一看并建议一个更好的实现,或者指出我可能正在做的任何不好的实践吗 我的主要父活动,所有其他活动都继承该活动:Java 这是对ActionBar的一个很好的使用吗?,java,android,actionbarsherlock,Java,Android,Actionbarsherlock,所以我刚开始尝试ActionBars,因为我想支持蜂巢之前的设备,所以我决定选择ActionBar Sherlock。我扫描了一下样品,想试试看。基本上,我想要的是一个通用的ActionBar,它应该对所有活动都具有相同的功能。我只是使用ActionBar本身来浏览不同的活动。我很快就把一些东西拼凑起来了,但不知何故它感觉“脏”,有人能帮我看一看并建议一个更好的实现,或者指出我可能正在做的任何不好的实践吗 我的主要父活动,所有其他活动都继承该活动: package com.example.abs
package com.example.abstest;
import android.app.ActionBar;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.os.Debug;
import android.widget.ArrayAdapter;
import com.actionbarsherlock.app.ActionBar.OnNavigationListener;
import com.actionbarsherlock.app.SherlockActivity;
public class ActionBarActivity extends SherlockActivity implements OnNavigationListener {
private String[] mItems = {"First", "Second", "Third"};
protected int mCurrentItem;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Context context = getSupportActionBar().getThemedContext();
ArrayAdapter<CharSequence> adapter = new ArrayAdapter<CharSequence>(
context, R.layout.sherlock_spinner_item, mItems);
adapter.setDropDownViewResource(R.layout.sherlock_spinner_dropdown_item);
getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
getSupportActionBar().setListNavigationCallbacks(adapter, this);
}
@Override
public boolean onNavigationItemSelected(int itemPosition, long itemId) {
if(mCurrentItem != itemPosition) {
Intent intent = null;
switch(itemPosition) {
case 0:
intent = new Intent(this, FirstActivity.class);
break;
case 1:
intent = new Intent(this, SecondActivity.class);
break;
case 2:
intent = new Intent(this, ThirdActivity.class);
break;
}
startActivity(intent);
}
return true;
}
}
基本上,我使用ActionBar在这三种类型的活动之间切换。对更好的实现有什么建议吗?这里有一个替代方法。使用ViewPager和选项卡
public class ActivityMain extends SherlockFragmentActivity {
/**
* PRIVATE ATTRIBUTES
*/
private static final String TAG = ActivityMain.class.getSimpleName();
// ihm
private ViewPager _viewPager;
private TabsAdapter _tabsAdapter;
private LayoutInflater _inflater;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//
// view pager
_viewPager = new ViewPager(this);
_viewPager.setId(R.id.pager);
_viewPager.setOffscreenPageLimit(10);
setContentView(_viewPager);
_inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//
// action bar
ActionBar bar = getSupportActionBar();
bar.setTitle(R.string.app_name);
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
//
// onglets
_tabsAdapter = new TabsAdapter(this, _viewPager);
_tabsAdapter.addTab(bar.newTab().setCustomView(getTabIndicator(getString(R.string.tle_tab_home), R.drawable.ic_menu_home)), FragmentAccueil.class, null);
_tabsAdapter.addTab(bar.newTab().setCustomView(getTabIndicator(getString(R.string.tle_tab_directory), R.drawable.tab_list_icon)), ContainerFragmentAnnuaire.class, null);
_tabsAdapter.addTab(bar.newTab().setCustomView(getTabIndicator(getString(R.string.tle_tab_favoris), android.R.drawable.btn_star)), FragmentFavoris.class, null);
if (savedInstanceState == null) {
// do stuff
}
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
menu.clear();
switch ((int) _viewPager.getCurrentItem()) {
case 0:
getSupportMenuInflater().inflate(R.menu.empty_menu, menu);
break;
case 1:
getSupportMenuInflater().inflate(R.menu.action_bar_main, menu);
break;
case 2:
getSupportMenuInflater().inflate(R.menu.empty_menu, menu);
break;
}
return super.onPrepareOptionsMenu(menu);
}
public static class TabsAdapter extends FragmentPagerAdapter implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
private final Context mContext;
private final ActionBar mActionBar;
private final ViewPager mViewPager;
private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
static final class TabInfo {
private final Class<?> clss;
private final Bundle args;
TabInfo(Class<?> _class, Bundle _args) {
clss = _class;
args = _args;
}
}
public TabsAdapter(SherlockFragmentActivity activity, ViewPager pager) {
super(activity.getSupportFragmentManager());
mContext = activity;
mActionBar = activity.getSupportActionBar();
mViewPager = pager;
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
}
public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
TabInfo info = new TabInfo(clss, args);
tab.setTag(info);
tab.setTabListener(this);
mTabs.add(info);
mActionBar.addTab(tab);
notifyDataSetChanged();
}
@Override
public int getCount() {
return mTabs.size();
}
@Override
public Fragment getItem(int position) {
TabInfo info = mTabs.get(position);
return Fragment.instantiate(mContext, info.clss.getName(), info.args);
}
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
public void onPageSelected(int position) {
mActionBar.setSelectedNavigationItem(position);
((SherlockFragmentActivity) mContext).supportInvalidateOptionsMenu();
}
public void onPageScrollStateChanged(int state) {
}
public void onTabSelected(Tab tab, FragmentTransaction ft) {
//
// force l'appel de onOptionMenuPrepared
((SherlockFragmentActivity) mContext).supportInvalidateOptionsMenu();
Object tag = tab.getTag();
for (int i = 0; i < mTabs.size(); i++) {
if (mTabs.get(i) == tag) {
mViewPager.setCurrentItem(i);
}
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
}
private View getTabIndicator(String text, int drawable) {
View indicator = _inflater.inflate(R.layout.abs_tab, null);
((TextView) indicator.findViewById(R.id.tab_title)).setText(text);
((ImageView) indicator.findViewById(R.id.tab_icon)).setImageResource(drawable);
return indicator;
}
公共类活动Main扩展了SherlockFragmentActivity{
/**
*私人属性
*/
私有静态最终字符串标记=ActivityMain.class.getSimpleName();
//ihm
私用阅览器(ViewPager);;
私人禁忌者(TabsAdapter);;
私人充气机;
@凌驾
创建时的公共void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
//
//查看寻呼机
_viewPager=新的viewPager(此);
_viewPager.setId(R.id.pager);
_viewPager.setOffscreenPageLimit(10);
setContentView(_viewPager);
_充气器=(LayoutInflater)getSystemService(Context.LAYOUT\u充气器\u SERVICE);
//
//动作条
ActionBar=getSupportActionBar();
bar.setTitle(R.string.app_name);
设置导航模式(操作栏导航模式选项卡);
//
//小歌
_tabsAdapter=新的tabsAdapter(这个,_viewPager);
_tabsAdapter.addTab(bar.newTab().setCustomView(getTabIndicator(getString(R.string.tle_tab_home),R.drawable.ic_menu_home)),FragmentAccueil.class,null);
_tabsAdapter.addTab(bar.newTab().setCustomView(getTabIndicator(getString(R.string.tle\u tab\u目录)、R.drawable.tab\u list\u图标)),ContainerFragmentAnnuaire.class,null);
_tabsAdapter.addTab(bar.newTab().setCustomView(getTabIndicator(getString(R.string.tle_tab_favoris),android.R.drawable.btn_star)),FragmentFavoris.class,null);
如果(savedInstanceState==null){
//做事
}
}
@凌驾
公共布尔值OnPrepareOptions菜单(菜单){
menu.clear();
开关((int)_viewPager.getCurrentItem()){
案例0:
getSupportMenuInflater().充气(R.menu.empty_菜单,菜单);
打破
案例1:
getSupportMenuInflater().充气(R.menu.action\u bar\u主菜单);
打破
案例2:
getSupportMenuInflater().充气(R.menu.empty_菜单,菜单);
打破
}
返回super.onPrepareOptions菜单(菜单);
}
公共静态类TabsAdapter扩展FragmentPagerAdapter实现ActionBar.TableListener、ViewPager.OnPageChangeListener{
私有最终上下文mContext;
私人终审法院;
专用最终查看页面mViewPager;
private final ArrayList mtab=new ArrayList();
静态最终类TabInfo{
私人期末班;
私有最终包args;
TabInfo(类_类,捆绑参数){
clss=_类;
args=_args;
}
}
公共选项卡dapter(SherlockFragmentActivity活动、ViewPager寻呼机){
super(activity.getSupportFragmentManager());
mContext=活动;
mActionBar=activity.getSupportActionBar();
mViewPager=寻呼机;
mViewPager.setAdapter(此);
mViewPager.setOnPageChangeListener(此);
}
public void addTab(ActionBar.Tab选项卡,类cls,Bundle args){
TabInfo=新的TabInfo(clss,args);
tab.setTag(信息);
tab.setTableListener(此);
添加(信息);
mActionBar.addTab(tab);
notifyDataSetChanged();
}
@凌驾
public int getCount(){
返回mTabs.size();
}
@凌驾
公共片段getItem(int位置){
TabInfo=mTabs.get(位置);
返回Fragment.instantiate(mContext,info.clss.getName(),info.args);
}
已滚动页面上的公共无效(int-position、float-positionOffset、int-positionOffsetPixels){
}
已选择页面上的公共无效(内部位置){
mActionBar.setSelectedNavigationItem(位置);
((SherlockFragmentActivity)mContext.supportInvalidateOptions菜单();
}
公共无效onPageScrollStateChanged(int状态){
}
已选择的公共事务(选项卡,碎片事务ft){
//
//已准备好对选项的强制上诉
((SherlockFragmentActivity)mContext.supportInvalidateOptions菜单();
Object tag=tab.getTag();
对于(int i=0;i
我看不出你的implem有什么固有的问题
public class ActivityMain extends SherlockFragmentActivity {
/**
* PRIVATE ATTRIBUTES
*/
private static final String TAG = ActivityMain.class.getSimpleName();
// ihm
private ViewPager _viewPager;
private TabsAdapter _tabsAdapter;
private LayoutInflater _inflater;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//
// view pager
_viewPager = new ViewPager(this);
_viewPager.setId(R.id.pager);
_viewPager.setOffscreenPageLimit(10);
setContentView(_viewPager);
_inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//
// action bar
ActionBar bar = getSupportActionBar();
bar.setTitle(R.string.app_name);
bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
//
// onglets
_tabsAdapter = new TabsAdapter(this, _viewPager);
_tabsAdapter.addTab(bar.newTab().setCustomView(getTabIndicator(getString(R.string.tle_tab_home), R.drawable.ic_menu_home)), FragmentAccueil.class, null);
_tabsAdapter.addTab(bar.newTab().setCustomView(getTabIndicator(getString(R.string.tle_tab_directory), R.drawable.tab_list_icon)), ContainerFragmentAnnuaire.class, null);
_tabsAdapter.addTab(bar.newTab().setCustomView(getTabIndicator(getString(R.string.tle_tab_favoris), android.R.drawable.btn_star)), FragmentFavoris.class, null);
if (savedInstanceState == null) {
// do stuff
}
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
menu.clear();
switch ((int) _viewPager.getCurrentItem()) {
case 0:
getSupportMenuInflater().inflate(R.menu.empty_menu, menu);
break;
case 1:
getSupportMenuInflater().inflate(R.menu.action_bar_main, menu);
break;
case 2:
getSupportMenuInflater().inflate(R.menu.empty_menu, menu);
break;
}
return super.onPrepareOptionsMenu(menu);
}
public static class TabsAdapter extends FragmentPagerAdapter implements ActionBar.TabListener, ViewPager.OnPageChangeListener {
private final Context mContext;
private final ActionBar mActionBar;
private final ViewPager mViewPager;
private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();
static final class TabInfo {
private final Class<?> clss;
private final Bundle args;
TabInfo(Class<?> _class, Bundle _args) {
clss = _class;
args = _args;
}
}
public TabsAdapter(SherlockFragmentActivity activity, ViewPager pager) {
super(activity.getSupportFragmentManager());
mContext = activity;
mActionBar = activity.getSupportActionBar();
mViewPager = pager;
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
}
public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
TabInfo info = new TabInfo(clss, args);
tab.setTag(info);
tab.setTabListener(this);
mTabs.add(info);
mActionBar.addTab(tab);
notifyDataSetChanged();
}
@Override
public int getCount() {
return mTabs.size();
}
@Override
public Fragment getItem(int position) {
TabInfo info = mTabs.get(position);
return Fragment.instantiate(mContext, info.clss.getName(), info.args);
}
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
public void onPageSelected(int position) {
mActionBar.setSelectedNavigationItem(position);
((SherlockFragmentActivity) mContext).supportInvalidateOptionsMenu();
}
public void onPageScrollStateChanged(int state) {
}
public void onTabSelected(Tab tab, FragmentTransaction ft) {
//
// force l'appel de onOptionMenuPrepared
((SherlockFragmentActivity) mContext).supportInvalidateOptionsMenu();
Object tag = tab.getTag();
for (int i = 0; i < mTabs.size(); i++) {
if (mTabs.get(i) == tag) {
mViewPager.setCurrentItem(i);
}
}
}
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
}
private View getTabIndicator(String text, int drawable) {
View indicator = _inflater.inflate(R.layout.abs_tab, null);
((TextView) indicator.findViewById(R.id.tab_title)).setText(text);
((ImageView) indicator.findViewById(R.id.tab_icon)).setImageResource(drawable);
return indicator;
}