如何在碎片导航？ [英] How to navigate in fragments?
本文介绍了如何在碎片导航？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
所以我使用的标签，寻求这种导航：
So I am using Tabs and seeking for this kind of navigation:
TAB1 - >内1 - > inside2
tab1 -- > inside 1 -- > inside2
TAB2 - >内3 - >内4
tab2 -- > inside 3 -- > inside 4
TAB3 - >内5
tab3 -- > inside 5
里面我的意思是，它应该打开一个新的布局和类。
inside I mean that it should open a new layout and class.
我的项目主类是这样的：
My project main class is this:
public class TabsFragmentActivity extends SherlockFragmentActivity implements
TabHost.OnTabChangeListener {
private TabHost mTabHost;
private HashMap<String, TabInfo> mapTabInfo = new HashMap<String, TabInfo>();
private TabInfo mLastTab = null;
private static Context mContext;
private class TabInfo {
private String tag;
private Class clss;
private Bundle args;
private Fragment fragment;
TabInfo(String tag, Class clazz, Bundle args) {
this.tag = tag;
this.clss = clazz;
this.args = args;
}
}
class TabFactory implements TabContentFactory {
private final Context mContext;
public TabFactory(Context context) {
mContext = context;
}
public View createTabContent(String tag) {
View v = new View(mContext);
v.setMinimumWidth(0);
v.setMinimumHeight(0);
return v;
}
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Step 1: Inflate layout
setContentView(R.layout.tabs_fragment_activity);
mContext = this;
// Step 2: Setup TabHost
initialiseTabHost(savedInstanceState);
if (savedInstanceState != null) {
mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab"));
}
addNavaigationBar();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
//Add Action item with title
menu.add("some")
.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM | MenuItem.SHOW_AS_ACTION_WITH_TEXT);
return super.onCreateOptionsMenu(menu);
}
public void addNavaigationBar() {
// Create Action Bar sherlock
ActionBar navigation_bar = getSupportActionBar();
// Setting standart navigation bar view
navigation_bar.setNavigationMode(ActionBar.NAVIGATION_MODE_STANDARD);
navigation_bar.setDisplayShowTitleEnabled(true);
navigation_bar.setTitle("Test");
// Override Action items to navigation bar. Calls onCreateOptionsMenu
// invalidateOptionsMenu();
}
protected void onSaveInstanceState(Bundle outState) {
outState.putString("tab", mTabHost.getCurrentTabTag()); // save the tab
// selected
super.onSaveInstanceState(outState);
}
/**
* Step 2: Setup TabHost
*/
private void initialiseTabHost(Bundle args) {
mTabHost = (TabHost) findViewById(android.R.id.tabhost);
mTabHost.setup();
TabInfo tabInfo = null;
TabsFragmentActivity.addTab(this, this.mTabHost, this.mTabHost
.newTabSpec("Tab1").setIndicator("Tab 1"),
(tabInfo = new TabInfo("Tab1", Tab1Fragment.class, args)));
this.mapTabInfo.put(tabInfo.tag, tabInfo);
TabsFragmentActivity.addTab(this, this.mTabHost, this.mTabHost
.newTabSpec("Tab2").setIndicator("Tab 2"),
(tabInfo = new TabInfo("Tab2", Tab2Fragment.class, args)));
this.mapTabInfo.put(tabInfo.tag, tabInfo);
TabsFragmentActivity.addTab(this, this.mTabHost, this.mTabHost
.newTabSpec("Tab3").setIndicator("Tab 3"),
(tabInfo = new TabInfo("Tab3", Tab3Fragment.class, args)));
this.mapTabInfo.put(tabInfo.tag, tabInfo);
// Default to first tab
this.onTabChanged("Tab1");
//
mTabHost.setOnTabChangedListener(this);
}
private static void addTab(TabsFragmentActivity activity, TabHost tabHost,
TabHost.TabSpec tabSpec, TabInfo tabInfo) {
// Attach a Tab view factory to the spec
tabSpec.setContent(activity.new TabFactory(activity));
String tag = tabSpec.getTag();
//getTabWidget()
View view = prepareTabView(activity, R.id.tab_bar_icon);
tabSpec.setIndicator(view);
// Check to see if we already have a fragment for this tab, probably
// from a previously saved state. If so, deactivate it, because our
// initial state is that a tab isn't shown.
tabInfo.fragment = activity.getSupportFragmentManager().findFragmentByTag(tag);
if (tabInfo.fragment != null && !tabInfo.fragment.isDetached()) {
FragmentTransaction ft = activity.getSupportFragmentManager().beginTransaction();
ft.detach(tabInfo.fragment);
ft.commit();
activity.getSupportFragmentManager().executePendingTransactions();
}
tabHost.addTab(tabSpec);
}
private static View prepareTabView(Context context, int drawable){
//inflate(R.layout.tab_indicator, android.R.id.tabs, false)
View tabIndicator = LayoutInflater.from(context).inflate(R.layout.tab_indicator, null);
ImageView icon = (ImageView) tabIndicator.findViewById(R.id.tab_bar_icon);
icon.setImageResource(R.drawable.ic_launcher);
return tabIndicator;
}
public void onTabChanged(String tag) {
TabInfo newTab = this.mapTabInfo.get(tag);
if (mLastTab != newTab) {
FragmentTransaction ft = this.getSupportFragmentManager()
.beginTransaction();
if (mLastTab != null) {
if (mLastTab.fragment != null) {
ft.detach(mLastTab.fragment);
}
}
if (newTab != null) {
if (newTab.fragment == null) {
newTab.fragment = Fragment.instantiate(this,
newTab.clss.getName(), newTab.args);
ft.add(R.id.realtabcontent, newTab.fragment, newTab.tag);
} else {
ft.attach(newTab.fragment);
}
}
mLastTab = newTab;
ft.commit();
this.getSupportFragmentManager().executePendingTransactions();
}
}
}
此创建3个标签与那里的内容。这是怎么看待TAB1片段类（其他类似于）：
This create 3 Tabs with there content. Here is how look Tab1 fragment class (other look similar) :
public class Tab1Fragment extends SherlockFragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
if (container == null) {
// We have different layouts, and in one of them this
// fragment's containing frame doesn't exist. The fragment
// may still be created from its saved state, but there is
// no reason to try to create its view hierarchy because it
// won't be displayed. Note this is not needed -- we could
// just run the code below, where we would create and return
// the view hierarchy; it would just never be used.
return null;
}
LinearLayout theLayout = (LinearLayout)inflater.inflate(R.layout.tab_frag1_layout, container, false);
// Register for the Button.OnClick event
Button b = (Button)theLayout.findViewById(R.id.frag1_button);
b.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
**//Here i want open a new window but don't change pressed tab and when press back it should go back at this window**
}
});
return theLayout;
}
}
我写的按钮preSS是我想要的。
I write on button press what I want.
我无法打开一个新的片段或活性这个片段里？
I can't open a new fragment or activity inside this fragment ?
我应该怎么办里面的片段导航？
How I should do navigation inside fragments ?
推荐答案
我喜欢让我的主人活动处理所有的过渡，所以我做我的片段是创建一个接口来处理导航。例如，您可以添加该接口您 Tab1Fragment ：
I like to let my host Activity handle all transitions, so what I do in my fragments is create an interface to handle navigation. For example, you could add this interface to your Tab1Fragment:
public interface Callback {
public void onButtonBClicked();
}
然后在你的 TabsFragmentActivity ，实施 Tab1Fragment.Callback ，它会要求你实现 onButtonBClicked（）。这里有一个如何可以实现此方法的一个例子：
Then in your TabsFragmentActivity, implement Tab1Fragment.Callback, which will require you to implement onButtonBClicked(). Here's an example of how you could implement this method:
@Override
public void onButtonBClicked() {
Fragment anotherFragment = Fragment.instantiate(this, AnotherFragment.class.getName());
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.add(R.id.realtabcontent, anotherFragment);
ft.addToBackStack(null);
ft.commit();
}
快完成了。接下来，你需要做的就是引用这个回调在你的片段。这通常是在 onAttached（）方法来实现。例如：
Almost done. Next, you need to do is get a reference to this callback in your fragment. This is typically achieved in the onAttached() method. For example:
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mCallback = (Callback) activity;
}
catch (ClassCastException e) {
throw new ClassCastException(activity.toString() + " must implement " + Callback.class.getName());
}
}
最后，在你的 OnClickListener ，呼叫 mCallback.onButtonBClicked（）。
这篇关于如何在碎片导航？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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