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POHow to use the FragmentTransaction's function "addToBackStack(String string)"
 

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  1. POHow to use the FragmentTransaction's function "addToBackStack(String string)"
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    <p>I want to comply a Tab in my application.So,I use a TabHost(within three fragment). In tab two or three ,I want to come to tab one instend of destroy the Acticity when I click the "Back" button on my phone.</p> <p>Can "addToBackStack(String temp)" comply it instend of doing something in the function of "onBackPressed".</p> <p>Below is my code. ps:This is my first question.My English is soso,sorry.</p> <pre><code>package in.wptrafficanalyzer.navigationtabdemo; import android.app.Activity; import android.app.Fragment; import android.app.FragmentManager; import android.app.FragmentTransaction; import android.os.Bundle; import android.view.GestureDetector; import android.view.MotionEvent; import android.widget.TabHost; public class MainActivity extends Activity{ private static final int SWIPE_MIN_DISTANCE = 120; private static final int SWIPE_MAX_OFF_PATH = 250; private static final int SWIPE_THRESHOLD_VELOCITY = 200; private TabHost tHost; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); tHost = (TabHost) findViewById(R.id.tabhost1); tHost.setup(); TabHost.OnTabChangeListener tabChangeListener = new TabHost.OnTabChangeListener() { @Override public void onTabChanged(String tabId) { FragmentManager fm = getFragmentManager(); Fragment androidFragment = fm.findFragmentByTag("android"); Fragment appleFragment = fm.findFragmentByTag("apple"); Fragment wpFragment = fm.findFragmentByTag("wp"); FragmentTransaction ft = fm.beginTransaction(); if(androidFragment!=null) ft.detach(androidFragment); if(appleFragment!=null) ft.detach(appleFragment); if(wpFragment != null) ft.detach(wpFragment); /** If current tab is android */ if(tabId.equalsIgnoreCase("tabAndroid")) { if(androidFragment==null) /** Create AndroidFragment and adding to fragmenttransaction */ ft.replace(R.id.realtabcontent, new AndroidFragment(), "android"); else /** Bring to the front, if already exists in the fragmenttransaction */ ft.attach(androidFragment); if(fm.getBackStackEntryCount() == 0) { ft.addToBackStack(null); } } else if(tabId.equalsIgnoreCase("tabApple")) { /** If current tab is apple */ if(appleFragment==null) /** Create AppleFragment and adding to fragmenttransaction */ ft.replace(R.id.realtabcontent,new AppleFragment(), "apple"); else /** Bring to the front, if already exists in the fragmenttransaction */ ft.attach(appleFragment); } else if(wpFragment==null) ft.replace(R.id.realtabcontent,new WPFragment(), "wp"); else ft.attach(wpFragment); ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN); ft.commit(); } }; /** Setting tabchangelistener for the tab */ tHost.setOnTabChangedListener(tabChangeListener); /** Defining tab builder for Andriod tab */ TabHost.TabSpec tSpecAndroid = tHost.newTabSpec("tabAndroid"); tSpecAndroid.setIndicator("Android",null); tSpecAndroid.setContent(new DummyTabContent(getBaseContext())); tHost.addTab(tSpecAndroid); /** Defining tab builder for Apple tab */ TabHost.TabSpec tSpecApple = tHost.newTabSpec("tabApple"); tSpecApple.setIndicator("Apple",null); tSpecApple.setContent(new DummyTabContent(getBaseContext())); tHost.addTab(tSpecApple); TabHost.TabSpec tSpecWp = tHost.newTabSpec("tabWp"); tSpecWp.setIndicator("Wp",null); tSpecWp.setContent(new DummyTabContent(getBaseContext())); tHost.addTab(tSpecWp); } } </code></pre>
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