I need some help. em adding fragment to activity this way. problem is on each call of openFragment it create fragment and add. which is obvious. Question: what modification i do, so it can add fragment only once. on the next call with same fragment tag it will do nothing.
case: press button first time it add fragment and shows. i press again same button it response nothing.
public static void openFragment(Activity activity, Fragment fragment) {
FragmentManager fragmentManager = ((ActionBarActivity) activity)
.getSupportFragmentManager();
FragmentTransaction ftx = fragmentManager.beginTransaction();
ftx.addToBackStack(fragment.getClass().getSimpleName());
ftx.setCustomAnimations(R.anim.slide_in_right,
R.anim.slide_out_left, R.anim.slide_in_left,
R.anim.slide_out_right);
ftx.add(R.id.main_content, fragment);
ftx.commit();
}
Solution: Save required information as an instance variable in calling activity. Then pass that instance variable into your fragment.
Use replace() to replace an existing fragment in a container with an instance of a new fragment class that you provide. Calling replace() is equivalent to calling remove() with a fragment in a container and adding a new fragment to that same container. transaction. commit();
Can a fragment be reused in multiple activities? These fragments can be considered self-contained components and could be reused by multiple activities potentially across multiple applications.
How do you delete Backstacks on Android? Use finishAffinity() to clear all backstack with existing one. Suppose, Activities A, B and C are in stack, and finishAffinity(); is called in Activity C, – Activity B will be finished / removing from stack. – Activity A will be finished / removing from stack.
Here's the solution, It will only allow you to add fragment once in stack otherwise it will pop-out the very same fragment from stack.
public static void openFragment(Activity activity, Fragment fragment) {
String fragmentTag = fragment.getClass().getName();
FragmentManager fragmentManager= ((ActionBarActivity) activity)
.getSupportFragmentManager();
boolean fragmentPopped = fragmentManager
.popBackStackImmediate(fragmentTag , 0);
if (!fragmentPopped && fragmentManager.findFragmentByTag(fragmentTag) == null) {
FragmentTransaction ftx = fragmentManager.beginTransaction();
ftx.addToBackStack(fragment.getClass().getSimpleName());
ftx.setCustomAnimations(R.anim.slide_in_right,
R.anim.slide_out_left, R.anim.slide_in_left,
R.anim.slide_out_right);
ftx.add(R.id.main_content, fragment);
ftx.commit();
}
}
slide_in_right
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="true">
<translate android:fromXDelta="100%"
android:toXDelta="0%" android:fromYDelta="0%"
android:toYDelta="0%" android:duration="200">
</translate>
</set>
slide_out_right
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="false">
<translate android:fromXDelta="0%" android:toXDelta="100%"
android:fromYDelta="0%" android:toYDelta="0%"
android:duration="200">
</translate>
</set>
slide_in_left
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="true">
<translate android:fromXDelta="-100%"
android:toXDelta="0%" android:fromYDelta="0%"
android:toYDelta="0%" android:duration="200">
</translate>
</set>
slide_out_left
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
android:shareInterpolator="true">
<translate android:fromXDelta="0%"
android:toXDelta="-100%" android:fromYDelta="0%"
android:toYDelta="0%" android:duration="200">
</translate>
</set>
And this is how you call this function:
openFragment(activity, new MyFragment());
Use FragmentTransaction.replace()
instead of FragmentTransaction.add()
:
This is essentially the same as calling
remove(Fragment)
for all currently added fragments that were added with the samecontainerViewId
and thenadd(int, Fragment, String)
with the same arguments given here.
The first call to FragmentTransaction.replace()
will simply add the fragment as there were no fragments to remove.
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