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POaddToBackStack displays all fragments
 

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    <p>I'm using MainActivity to manage the display of several fragments. I have a showFragment method that iterates through my fragment array and either shows/hides them, and sets the backstack accordingly. The issue is that any time I press the back button, the HomeFrag gets displayed, with all of the other fragments piled up underneath. I was under the impression from the documentation that the back button will reverse the last transaction (anything that was added before the commit). Can anyone explain why this might be causing this unexpected behavior? Here is my main activity. The fragments are all defined in activity_main.xml:</p> <pre><code> public class MainActivity extends MenuBaseActivity { private static final int HOME = 0; private static final int WRITE = 1; private static final int UPLOAD = 2; private static final int SHARE = 3; private static final int SNAP = 4; private static final int POSITION = 5; private static final int FRAGMENT_COUNT = POSITION + 1; /** The current fragment being displayed **/ private int mCurrentFragment = -1; private Fragment[] fragments = new Fragment[FRAGMENT_COUNT]; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); FragmentManager fm = getSupportFragmentManager(); fragments[HOME] = fm.findFragmentById(R.id.homeFrag); fragments[WRITE] = fm.findFragmentById(R.id.writeFrag); fragments[UPLOAD] = fm.findFragmentById(R.id.uploadFrag); fragments[SHARE] = fm.findFragmentById(R.id.shareFrag); fragments[SNAP] = fm.findFragmentById(R.id.snapFrag); fragments[POSITION] = fm.findFragmentById(R.id.positionFrag); // If no fragments are currently being displayed, show the home frag if(mCurrentFragment == -1) { showFragment(0,true); } } /* * Handles the click event for all navigation buttons (navOnClick) in the fragments. */ //TODO: Tag navigation with text strings instead of integers public void navOnClick(View v) { Object objectTag = v.getTag(); int tag = Integer.valueOf(objectTag.toString()); showFragment(tag, true); } public void showFragment(int fragmentIndex, boolean addToBackStack) { Log.v(Constants.getLogTag(), "Main: fragmentIndex:" + fragmentIndex + " backstack:" + addToBackStack); FragmentManager fm = getSupportFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); //ft.setCustomAnimations(R.anim.slide_in_left, R.anim.slide_out_right); for (int i = 0; i &lt; fragments.length; i++) { if (i == fragmentIndex) { ft.show(fragments[i]); } else { ft.hide(fragments[i]); } } if (addToBackStack) { Log.v(Constants.getLogTag(), "Main: Adding to backstack"); ft.addToBackStack(null); } //Update the current fragment identifier mCurrentFragment = fragmentIndex; ft.commit(); } } </code></pre>
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    1. USjwBurnside
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    1. COYou are iterating through your array and hiding every single fragment in one transaction, so when you hit the backbutton, it unhides all of them at once.
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      1. USbtse
    2. COIt seems messy in there. Change your whole logic, don't do thing like that.
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      1. USM-WaJeEh
    3. CO@M-WaJeEh Maybe you could suggest a quick refactor, I don't think you're comment is very helpful as is.
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      1. USjwBurnside
 

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