複数のフラグメントを実装しようとしています。各フラグメントは、下部のナビゲーション ボタンをクリックすると変更または置換されるアクティビティで表示されます。frag1 から frag2 にデータを渡すことができましたが、frag2 またはその他のフラグメント ボタンをクリックすると、ナビゲーション バー、つまりストリーム バーがリセットされ、データが失われます。
これが私が自分で試したものです。2番目のフラグメントに onSaveInstanceState を実装しましたが、役に立ちませんでした。どういうわけか、フラグメントが新しく作成されています。
ここに記載されている解決策も試しました
ここでのアイデアはレイアウトです
主な活動
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.View;
import android.widget.TextView;
import com.br.tron.bottombar.RadioFragment;
import com.br.tron.bottombar.StreamFragment;
import com.br.tron.bottombar.InfoFragment;
public class MainActivity extends AppCompatActivity implements PushStreamLink{
BottomNavigationView bottomNavigationView;
private Fragment fragment;
private FragmentManager fragmentManager;
View view;
//private FragmentTransaction transaction;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
fragmentManager = getSupportFragmentManager();
fragment = new RadioFragment();
fragment.setRetainInstance(true);
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.main_container, fragment).commit();
bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNavigationBar);
bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener(){
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
String tag = "";
switch (item.getItemId()) {
case R.id.nav_button_one:
fragment = new RadioFragment();
fragment.setRetainInstance(true);
tag = "radio_fragment";
break;
case R.id.nav_button_two:
fragment = new StreamFragment();
fragment.setRetainInstance(true);
tag = "stream_fragment";
break;
case R.id.nav_button_three:
fragment = new InfoFragment();
fragment.setRetainInstance(true);
tag = "info_fragment";
break;
}
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.main_container, fragment, tag).commit();
return true;
}
});
}
@Override
public void sendStreamLink(String link) {
fragment =new StreamFragment();
fragment.setRetainInstance(true);
fragmentManager=getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.main_container, fragment,"stream_fragment").addToBackStack(null).commit();
getSupportFragmentManager().executePendingTransactions();
StreamFragment sf=(StreamFragment) getSupportFragmentManager().findFragmentByTag("stream_fragment");
sf.getUrl(link);
view = bottomNavigationView.findViewById(R.id.nav_button_two);
view.performClick();
}
}
RadioFragment(データ送信元のフラグメント)
import android.app.Activity;
import android.content.Context;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
/**
* Created by Tron on 1/5/2017.
*/
public class RadioFragment extends Fragment implements Button.OnClickListener {
Button buttonman;
View rootView;
PushStreamLink pushStreamLink;
Activity a;
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof Activity) {
//a = (Activity) context;
}
if (context instanceof PushStreamLink) {
pushStreamLink = (PushStreamLink) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
public RadioFragment(){
};
@Override
public View onCreateView(LayoutInflater inflater,ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_player, container, false);
buttonman = (Button)rootView.findViewById(R.id.buttonman);
buttonman.setOnClickListener(this);
return rootView;
}
@Override
public void onClick(View v) {
/*Fragment fragment = new StreamFragment();
FragmentManager fragmentManager = getActivity().getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.main_container, fragment);
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();*/
//((MainActivity)a).performStreamClick();
pushStreamLink.sendStreamLink("www.zz.com");
}
}
StreamFragment (データが受信されたがビューに保存されていないフラグメント)
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;
/**
* Created by Tron on 1/5/2017.
*/
public class StreamFragment extends Fragment {
String streamUrl="NoLinkFound";
TextView textView;
public StreamFragment(){};
@Override
public View onCreateView( LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_stream, container, false);
if(savedInstanceState==null)
{
}
else
{
streamUrl=savedInstanceState.getString("CurrentStreamLink");
textView =(TextView) getActivity().findViewById(R.id.streamLinkTextView);
textView.setText(streamUrl);
}
return view;
}
@Override
public void onSaveInstanceState(Bundle outState){
outState.putString("CurrentStreamLink",streamUrl);
super.onSaveInstanceState(outState);
}
@Override
public void onActivityCreated(Bundle savedInstanceState){
if (streamUrl!=null) {
// streamUrl = savedInstanceState.getString("CurrentStreamLink");
textView = (TextView) getActivity().findViewById(R.id.streamLinkTextView);
textView.setText(streamUrl);
}
super.onActivityCreated(savedInstanceState);
}
public void getUrl(String data)
{
streamUrl=data;
if (streamUrl!=null)
{
textView=(TextView) getActivity().findViewById(R.id.streamLinkTextView);
textView.setText(streamUrl);
}
}
}