20190318
-----Fragment-interface-----
-----MainActivity-----
package jp.co.kywataapp.myapplication;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements BlankFragment.OnListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.add(R.id.container, new BlankFragment(), "BlankFragment");
transaction.commit();
}
@Override
public int onAction(int id) {
Toast.makeText(this, "OnRecive---"+id, Toast.LENGTH_LONG).show();
return 12345;
}
}
-----BlankFragment-----
package jp.co.kywataapp.myapplication;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class BlankFragment extends Fragment {
OnListener mListener;
public BlankFragment() {
}
public interface OnListener {
public int onAction(int id);
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
try {
mListener = (OnListener) context;
} catch (ClassCastException e) {
throw new ClassCastException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.v("TAGTAG","From-MainActivity--"+mListener.onAction(123));
return inflater.inflate(R.layout.fragment_blank, container, false);
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
}
-----layout/activity_main.xml-----
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:id="@+id/container"
android:layout_width="0dp"
android:layout_height="340dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
android:orientation="horizontal"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"></LinearLayout>
</android.support.constraint.ConstraintLayout>
-----layout/fragment_blank.xml-----
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
tools:context=".BlankFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="@string/hello_blank_fragment" />
</FrameLayout>
-----