Android Navigation Drawer unable to setText in a Fragment from MainActivity

问题

I am trying to put GPS coordinates on TextView of a Fragment from MainActivity but I can not figure out how to do this.

I have:

MainActivity.java
LocationFragment.java

I want to update an TextView in LocationFragment from MainActivity's onLocationChanged() method.

Is any chance to do this :

public void onLocationChanged(Location location) {

    lat = (double) (location.getLatitude());
    lng = (double) (location.getLongitude());

    fragment.updateText(lat +" "+lng);

}

回答1:

You can use Interface for it so main objective of Fragment re-usability is maintained. You can implement communication between Activity-Fragment OR Fragment-Fragment via using following :

回答2:

its very simple, just create one method in fragment like below,

public void SetTitle() {
        text_title.setText("hello fragment");
    }

now call that method from Activity, below code it for <= ANDROID API 11

HomeFragment fragment = (HomeFragment) getSupportFragmentManager()
                        .findFragmentByTag("HomeFragment");
                fragment.SetTitle();

for > 11 API just change getFragmentManager()

now you can do whatever you want.

来源：https://stackoverflow.com/questions/24321449/android-navigation-drawer-unable-to-settext-in-a-fragment-from-mainactivity

标签

android