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android - How to get the fragment instance from the FragmentActivity?

问题描述:

I set the content view in the FragmentActivity, and the activity will create the fragment instance for me according to the class name specified in the layout file. But how can I get that fragment instance?

public class MyActivity extends FragmentActivity {

@Override

protected void onCreate(Bundle extra) {

super.onCreate(extra);

setContentView(R.layout.page_fragment);

}

}

<?xml version="1.0" encoding="utf-8"?>

<fragment xmlns:android="http://schemas.android.com/apk/res/android"

android:id="@+id/pageview"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:name="org.xi.android.PageFragment" />

网友答案:

You can use use findFragmentById in FragmentManager.

Since you are using the Support library (you are extending FragmentActivity) you can use:

getSupportFragmentManager().findFragmentById(R.id.pageview)

If you are not using the support library (so you are on Honeycomb+ and you don't want to use the support library):

getFragmentManager().findFragmentById(R.id.pageview)

Please consider that using the support library is recommended even on Honeycomb+.

网友答案:

To get the fragment instance in a class that extends FragmentActivity:

MyclassFragment instanceFragment=
    (MyclassFragment)getSupportFragmentManager().findFragmentById(R.id.idFragment);

To get the fragment instance in a class that extends Fragment:

MyclassFragment instanceFragment =  
    (MyclassFragment)getFragmentManager().findFragmentById(R.id.idFragment);
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