从片段遍历到片段 BottomNavigationView 图标突出显示

Question

我正在尝试实现 BottomNavigationView，目前为止很成功。目前正在尝试实现片段到片段的移动，这也是成功的，但是当我从一个片段[radio]移动到另一个[stream]时，导航栏应该突出显示图标[stream]但它没有发生有没有办法我可以通过片段本身设置高亮属性吗？以下是我的应用程序的代码和快照：

MainActivity.java

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 {

    BottomNavigationView bottomNavigationView;
    private Fragment fragment;
    private FragmentManager fragmentManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        fragmentManager = getSupportFragmentManager();
        fragment = new RadioFragment();
        final FragmentTransaction transaction = fragmentManager.beginTransaction();
        transaction.add(R.id.main_container, fragment).commit();

        bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNavigationBar);
        bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener(){
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {

                switch (item.getItemId()) {
                    case R.id.nav_button_one:
                        fragment = new RadioFragment();
                        break;
                    case R.id.nav_button_two:
                        fragment = new StreamFragment();
                        break;
                    case R.id.nav_button_three:
                        fragment = new InfoFragment();
                        break;
                }
                final FragmentTransaction transaction = fragmentManager.beginTransaction();
                transaction.replace(R.id.main_container, fragment).commit();
                return true;
            }
        });
    }

    public void performStreamClick(){
        View view = bottomNavigationView.findViewById(R.id.main_container);
        view.performClick();
    }
}

RadioFragment.java

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;

public class RadioFragment extends Fragment implements Button.OnClickListener  {

    Button buttonman;
    View rootView;

    Activity a;

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);

        if (context instanceof Activity) {
            a = (Activity) context;
        }
    }

    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();
    }
}

StreamFragment.java

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.Button;

public class StreamFragment extends Fragment {

    public StreamFragment(){};

    @Override
    public View onCreateView(final LayoutInflater inflater,final ViewGroup container,final Bundle savedInstanceState) {
        return  inflater.inflate(R.layout.fragment_stream, container, false);

    }

}

Answer 1

你没有初始化buttonman

在RadioFragment.java

Button buttonman;
View rootView;    
Activity a;

@Override
public void onAttach(Context context) {
super.onAttach(context);

if (context instanceof Activity){
    a=(Activity) context;
}
}

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.yourbuttonid); // initialize here
    buttonman.setOnClickListener(this);
    return rootView;

}
@Override
public void onClick(View v) {
   ((MainActivity)a).performStreamClick();

}

在MainActivity

public void performStreamClick(){
   View view = bottomNavigationView.findViewById(R.id.nav_button_two);
view.performClick();
}

注意：您也可以通过界面

说明

您已添加

Fragment fragment = new StreamFragment(); 
FragmentManager fragmentManager = getActivity().getSupportFragmentManager(); 
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
fragmentTransaction.replace(R.id.main_container, fragment); 
fragmentTransaction.addToBackStack(null); 
fragmentTransaction.commit();

This will simply push StreamFragment in main_container framelayout without notify bottomNavigationView.

这里

View view = bottomNavigationView.findViewById(R.id.nav_button_two);
view.performClick();

This line will programmatically perform click on nav_button_two in bottomNavigationView.. then all event will handle by bottomNavigationView .. Then it will highlight the stream icon.

从片段遍历到片段 BottomNavigationView 图标突出显示

Traversing from fragment to fragment BottomNavigationView icon highlight

android

android-studio

android-fragments

fragmentmanager

bottomnavigationview