I am converting my Activity to a Fragment.
I need help manipulating my Activity code to run as a Fragment.
I know I have to convert the onCreate() method to be onCreateView().
I don't know how to do so.
My code for the onCreate()...
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_author_fact);
//to eget reference to TextView for the fact
mAuthorFactTextView = (TextView) findViewById(R.id.authorFactTextView);
//Extract the resource id for the fact from the intent
//If none is provided, display the "fact missing" message
int authorFact = getIntent().getIntExtra(QuoteFragment.EXTRA_AUTHOR_FACT,
R.string.fact_error);
// put the fact string in the fact TextView
mAuthorFactTextView.setText(authorFact);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
I need to use this code structure
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View v = inflater.inflate(R.layout.fragment_bug_list, container, false);
//Setup floating action button to add a new bug
final View addButton = v.findViewById(R.id.add_button);
addButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View view){
addBug();
}
});
return v;
}
How do I do this correctly?
I have tried different things, but I can't figure it out.
To briefly address the problem of
I need to change from activity to fragment
Let this be the layout we want to convert. Just a simple RelativeLayout with a centered TextView. You can use the exact same layout when you convert the Activity to a Fragment. I named it fragment_layout.xml.
Of course, you will later need to change the Activity's layout to include the Fragment, but that was not the question...
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/textView"
android:text="Hello World"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"/>
</RelativeLayout>
Here is an Activity that we are going to convert. Notice the setContentView loads the fragment_layout.xml file and it grab out that TextView using findViewById.
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private TextView textView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_layout);
textView = (TextView) findViewById(R.id.textView);
}
}
And here is the Fragment that will act the exact same as the Activity above. Notice, now using inflate.inflate with the fragment_layout.xml file to get the View in order to grab out that TextView using rootView.findViewById.
And OnCreateView needs to return that View from the inflater.
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
public class MainFragment extends Fragment {
private TextView textView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_layout, container, false);
textView = (TextView) rootView.findViewById(R.id.textView);
return rootView;
}
}
来源：https://stackoverflow.com/questions/35785049/converting-an-activity-to-a-fragment