该应用程序无法运行，并且始终在模拟器和真实设备上停止，也无法从firebase数据库中检索数据。 在手机上它只是显示应用程序停止，因为它工作了一点点模拟器，但没有检索数据。
09-04 11:32:06.674 21301-24890/com.food.dany.danaerys D/FA: Connected to
remote service
09-04 11:32:06.674 21301-24890/com.food.dany.danaerys V/FA: Processing
queued up service tasks: 3
09-04 11:32:07.197 21301-21301/com.food.dany.danaerys W/art: Before Android
4.1, method int
android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int,
boolean) would have incorrectly overridden the package-private method in
android.widget.ListView
09-04 11:32:07.199 21301-21301/com.food.dany.danaerys I/Choreographer:
Skipped 30 frames! The application may be doing too much work on its main
thread.
09-04 11:32:07.214 21301-21333/com.food.dany.danaerys D/EGL_emulation:
eglMakeCurrent: 0x9dd70000: ver 2 0 (tinfo 0x9dd73fd0)
09-04 11:32:07.862 21301-21301/com.food.dany.danaerys I/Choreographer:
Skipped 39 frames! The application may be doing too much work on its main
thread.
09-04 11:32:08.019 21301-21301/com.food.dany.danaerys
W/IInputConnectionWrapper: finishComposingText on inactive InputConnection
09-04 11:32:11.747 21301-24890/com.food.dany.danaerys V/FA: Inactivity,
disconnecting from the service
这是我下面的java代码，当我从数据库中检索数据时，它显示空白屏幕，并从firebase中检索任何内容。
package com.food.dany.danaerys;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
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 android.widget.TextView;
import android.widget.Toast;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.food.dany.danaerys.Common.Common;
import com.food.dany.danaerys.Interface.ItemClickListener;
import com.food.dany.danaerys.ViewHolder.MenuViewHolder;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.squareup.picasso.Picasso;
public class Home extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
FirebaseDatabase database;
DatabaseReference category;
TextView txtFullName;
RecyclerView recycler_menu;
RecyclerView.LayoutManager layoutManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setTitle("Menu");
setSupportActionBar(toolbar);
//init firebase
database=FirebaseDatabase.getInstance();
category=database.getReference("category");
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.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
//set name for user
View headerView=navigationView.getHeaderView(0);
txtFullName=(TextView)headerView.findViewById(R.id.txtFullName);
txtFullName.setText(Common.currentUser.getName());
//load menu
recycler_menu=(RecyclerView)findViewById(R.id.recycler_menu);
recycler_menu.setHasFixedSize(true);
layoutManager=new LinearLayoutManager(this);
recycler_menu.setLayoutManager(layoutManager);
loadMenu();
}
private void loadMenu() {
FirebaseRecyclerAdapter<Category,MenuViewHolder> adapter=new FirebaseRecyclerAdapter<Category, MenuViewHolder>(Category.class,R.layout.menu_item,MenuViewHolder.class,category) {
@Override
protected void populateViewHolder(MenuViewHolder viewHolder, Category model, int position) {
viewHolder.txtMenuName.setText(model.getName());
Picasso.with(getBaseContext()).load(model.getImage())
.into(viewHolder.imageView);
final Category clickItem=model;
viewHolder.setItemClickListener(new ItemClickListener() {
@Override
public void onClick(View view, int position, boolean isLongClick) {
Toast.makeText(Home.this,""+clickItem.getName(),Toast.LENGTH_SHORT).show();
}
});
}
};
recycler_menu.setAdapter(adapter);
}
@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.home, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_menu) {
// Handle the camera action
} else if (id == R.id.nav_cart) {
} else if (id == R.id.nav_orders) {
} else if (id == R.id.nav_log_out) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}