我试图导航到我的某个片段，但我似乎无法在此处调用该片段
MainActivity.java
package ics115_4ite_lim.bookings;
import android.app.Fragment;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.NavigationView;
import android.support.design.widget.Snackbar;
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 android.view.View;
import ics115_4ite_lim.bookings.Fragments.ScheduleFragment;
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);
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();
}
});
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.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@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.
Fragment fragment = null;
int id = item.getItemId();
if (id == R.id.schedule_fragment) {
fragment = new ScheduleFragment();
} else if (id == R.id.driver_fragment) {
} else if (id == R.id.transaction_fragment) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
这是我要去的片段
ScheduleFragment.java
package ics115_4ite_lim.bookings.Fragments;
import android.app.Fragment;
import android.content.Context;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.TextView;
import android.widget.Toast;
import com.daimajia.swipe.SwipeLayout;
import com.daimajia.swipe.adapters.RecyclerSwipeAdapter;
import com.daimajia.swipe.util.Attributes;
import java.util.ArrayList;
import ics115_4ite_lim.bookings.DividerItemDecoration;
import ics115_4ite_lim.bookings.R;
import ics115_4ite_lim.bookings.Student;
/**
* Created by Mark Terrance on 12/7/2017.
*/
public class ScheduleFragment extends Fragment {
private ArrayList<Student> mDataSet;
private Toolbar toolbar;
private TextView tvEmptyView;
private RecyclerView mRecyclerView;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
//Inflate the layout for this fragment_packages
final View view = inflater.inflate(R.layout.schedule_fragment, container, false);
initScheduleView(view);
return view;
}
private void initScheduleView(View view){
mRecyclerView = view.findViewById(R.id.recycleView);
// Layout Managers:
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
// Item Decorator:
//mRecyclerView.addItemDecoration(new DividerItemDecoration(getResources().getDrawable(R.drawable.divider)));
mRecyclerView.addItemDecoration(new DividerItemDecoration(getResources().getDrawable(R.drawable.divider)));
mDataSet = new ArrayList<Student>();
loadData();
if (mDataSet.isEmpty()) {
mRecyclerView.setVisibility(View.GONE);
tvEmptyView.setVisibility(View.VISIBLE);
} else {
mRecyclerView.setVisibility(View.VISIBLE);
tvEmptyView.setVisibility(View.GONE);
}
// Creating Adapter object
SwipeRecyclerViewAdapter mAdapter = new SwipeRecyclerViewAdapter(getActivity(), mDataSet);
// Setting Mode to Single to reveal bottom View for one item in List
// Setting Mode to Mutliple to reveal bottom Views for multile items in List
((SwipeRecyclerViewAdapter) mAdapter).setMode(Attributes.Mode.Single);
mRecyclerView.setAdapter(mAdapter);
/* Scroll Listeners */
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
Log.e("RecyclerView", "onScrollStateChanged");
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
}
});
}
// load initial data
public void loadData() {
for (int i = 0; i <= 20; i++) {
mDataSet.add(new Student("Student " + i, "androidstudent" + i + "@gmail.com"));
}
}
private class SwipeRecyclerViewAdapter extends RecyclerSwipeAdapter<SwipeRecyclerViewAdapter.SimpleViewHolder> {
private Context mContext;
private ArrayList<Student> studentList;
public SwipeRecyclerViewAdapter(Context context, ArrayList<Student> objects) {
this.mContext = context;
this.studentList = objects;
}
@Override
public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.swipe_row_item, parent, false);
return new SimpleViewHolder(view);
}
@Override
public void onBindViewHolder(final SimpleViewHolder viewHolder, final int position) {
final Student item = studentList.get(position);
viewHolder.tvName.setText((item.getName()) + " - Row Position " + position);
viewHolder.tvEmailId.setText(item.getEmailId());
viewHolder.swipeLayout.setShowMode(SwipeLayout.ShowMode.PullOut);
// Drag From Left
viewHolder.swipeLayout.addDrag(SwipeLayout.DragEdge.Left, viewHolder.swipeLayout.findViewById(R.id.bottom_wrapper1));
// Drag From Right
viewHolder.swipeLayout.addDrag(SwipeLayout.DragEdge.Right, viewHolder.swipeLayout.findViewById(R.id.bottom_wrapper));
// Handling different events when swiping
viewHolder.swipeLayout.addSwipeListener(new SwipeLayout.SwipeListener() {
@Override
public void onClose(SwipeLayout layout) {
//when the SurfaceView totally cover the BottomView.
}
@Override
public void onUpdate(SwipeLayout layout, int leftOffset, int topOffset) {
//you are swiping.
}
@Override
public void onStartOpen(SwipeLayout layout) {
}
@Override
public void onOpen(SwipeLayout layout) {
//when the BottomView totally show.
}
@Override
public void onStartClose(SwipeLayout layout) {
}
@Override
public void onHandRelease(SwipeLayout layout, float xvel, float yvel) {
//when user's hand released.
}
});
/*viewHolder.swipeLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if ((((SwipeLayout) v).getOpenStatus() == SwipeLayout.Status.Close)) {
//Start your activity
Toast.makeText(mContext, " onClick : " + item.getName() + " \n" + item.getEmailId(), Toast.LENGTH_SHORT).show();
}
}
});*/
viewHolder.swipeLayout.getSurfaceView().setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(mContext, " onClick : " + item.getName() + " \n" + item.getEmailId(), Toast.LENGTH_SHORT).show();
}
});
viewHolder.btnLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(v.getContext(), "Clicked on Map " + viewHolder.tvName.getText().toString(), Toast.LENGTH_SHORT).show();
}
});
viewHolder.tvShare.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(view.getContext(), "Clicked on Share " + viewHolder.tvName.getText().toString(), Toast.LENGTH_SHORT).show();
}
});
viewHolder.tvEdit.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(view.getContext(), "Clicked on Edit " + viewHolder.tvName.getText().toString(), Toast.LENGTH_SHORT).show();
}
});
viewHolder.tvDelete.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mItemManger.removeShownLayouts(viewHolder.swipeLayout);
studentList.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, studentList.size());
mItemManger.closeAllItems();
Toast.makeText(view.getContext(), "Deleted " + viewHolder.tvName.getText().toString(), Toast.LENGTH_SHORT).show();
}
});
// mItemManger is member in RecyclerSwipeAdapter Class
mItemManger.bindView(viewHolder.itemView, position);
}
@Override
public int getItemCount() {
return studentList.size();
}
@Override
public int getSwipeLayoutResourceId(int position) {
return R.id.swipe;
}
// ViewHolder Class
public class SimpleViewHolder extends RecyclerView.ViewHolder {
SwipeLayout swipeLayout;
TextView tvName;
TextView tvEmailId;
TextView tvDelete;
TextView tvEdit;
TextView tvShare;
ImageButton btnLocation;
public SimpleViewHolder(View itemView) {
super(itemView);
swipeLayout = (SwipeLayout) itemView.findViewById(R.id.swipe);
tvName = (TextView) itemView.findViewById(R.id.tvName);
tvEmailId = (TextView) itemView.findViewById(R.id.tvEmailId);
tvDelete = (TextView) itemView.findViewById(R.id.tvDelete);
tvEdit = (TextView) itemView.findViewById(R.id.tvEdit);
tvShare = (TextView) itemView.findViewById(R.id.tvShare);
btnLocation = (ImageButton) itemView.findViewById(R.id.btnLocation);
}
}
}
}
我已经尝试过调试它，我最终得到了一个空片段
我不知道错误是什么，因为我只是按照教程
帮忙吗？谢谢：D
编辑：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="ics115_4ite_lim.bookings.MainActivity"
tools:showIn="@layout/app_bar_main">
<FrameLayout
android:id="@+id/content_frame"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</RelativeLayout>
答案 0 :(得分：0)
您需要对您创建的Fragment执行某些操作。
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
Fragment fragment = null;
int id = item.getItemId();
if (id == R.id.schedule_fragment) {
fragment = new ScheduleFragment();
} else if (id == R.id.driver_fragment) {
} else if (id == R.id.transaction_fragment) {
}
getSupportFragmentManager().beginTransaction()
.replace(R.id.container_id, fragment).commit();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
null，所有if分支都应该{。}}
将其初始化为某种东西R.id.container_id应该是布局中ViewGroup的id，为空，这就是放置片段的位置。