android - 从 fragment 调用 fragment

Question

我想在单击当前 fragment 中的按钮时调用当前 fragment 中的另一个 fragment 。

这是我的主要 Activity :

import android.app.FragmentManager;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;

import com.asd.fragments.RecommendationsFragment;
import com.asd.ibitz4college.fragments.SearchCoachingFragment;
import com.asd.fragments.SearchCollegesFragment;
import com.asd.fragments.MainFragment;
import com.asd.fragments.SearchConsultanciesFragment;
import com.asd.fragments.TrendingFragment;

public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);



        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);

        FragmentManager fm = getFragmentManager();
        fm.beginTransaction().replace(R.id.content_frame,new MainFragment()).commit();





    }

    @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();

        FragmentManager fm = getFragmentManager();
        fm.beginTransaction().replace(R.id.content_frame,new MainFragment()).commit();

        if (id == R.id.search_colleges) {
            // Handle the Search Colleges action
            fm.beginTransaction().replace(R.id.content_frame,new SearchCollegesFragment()).commit();

        }

         else if (id == R.id.search_consultancies) {
            fm.beginTransaction().replace(R.id.content_frame,new SearchConsultanciesFragment()).commit();

        }


        else if (id == R.id.search_coaching) {

            fm.beginTransaction().replace(R.id.content_frame,new SearchCoachingFragment()).commit();


        }

        else if (id == R.id.my_recommendations) {
         fm.beginTransaction().replace(R.id.content_frame, new RecommendationsFragment()).commit();

        }

         else if (id == R.id.trending) {

            fm.beginTransaction().replace(R.id.content_frame, new TrendingFragment()).commit();


        } else if (id == R.id.profile) {

        } else if (id == R.id.logout) {

        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    }
}

这是我的 fragment 之一:

import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.asd.k4c.R;


public class SearchCoachingFragment extends Fragment  {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

            View rootview = inflater.inflate(R.layout.fragment_search_coaching,container,false);
            return rootview;



    }
} //Update code formatting

假设我想在点击时从上面的 fragment 调用 resultsfragment一个id为btn_search的按钮，那怎么办？我在这里尝试了一些已经存在的答案，不走运!P.S:我是 android 开发世界的初学者。

Answer 1

为了进行 fragment 交易。请执行以下操作。

例如.. A 和 B 是 fragment 。 当前 A 对用户可见。如果你想做交易。如下创建即可

 B b = new B(); 
((YourActivity)getActivity).setnewFragment(b,true);

public void setNewFragment(Fragment fragment,boolean addbackstack) {
        FragmentManager manager = getSupportFragmentManager();
        FragmentTransaction transaction = manager.beginTransaction();
        transaction.replace(R.id.fragment_content, fragment);
        if (addbackstack)
            transaction.addToBackStack(title);
        transaction.commit();
    }