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ナビゲーションパッドを使用するアンドロイドアプリを作成しています。引き出しに複数のオプションがあるので、ナビゲーションとアクティビティツールバーを実装したいアクティビティを渡すメソッドを作成する必要がありました。ナビゲーションドロアメソッドはNullPointer例外を受け取ります
問題は、私がアクティビティでNavigatioDrawerメソッドを宣言するときにNULLポインタを受け取っていることです。私がお見せしましょう：
HERE（私が活動にインスタンス化します）MYナビゲーションDRAWER方法であって、
package studio.brunocasamassa.ajudaaqui.helper;
import android.app.Activity;
import android.content.Intent;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.design.widget.NavigationView;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import com.mikepenz.materialdrawer.AccountHeader;
import com.mikepenz.materialdrawer.AccountHeaderBuilder;
import com.mikepenz.materialdrawer.Drawer;
import com.mikepenz.materialdrawer.DrawerBuilder;
import com.mikepenz.materialdrawer.model.DividerDrawerItem;
import com.mikepenz.materialdrawer.model.PrimaryDrawerItem;
import com.mikepenz.materialdrawer.model.ProfileDrawerItem;
import com.mikepenz.materialdrawer.model.interfaces.IDrawerItem;
import com.mikepenz.materialdrawer.model.interfaces.IProfile;
import studio.brunocasamassa.ajudaaqui.MainActivity;
import studio.brunocasamassa.ajudaaqui.PerfilActivity;
import studio.brunocasamassa.ajudaaqui.R;
import studio.brunocasamassa.ajudaaqui.ConfiguracoesActivity;
import studio.brunocasamassa.ajudaaqui.ChatActivity;
import studio.brunocasamassa.ajudaaqui.GruposActivity;
import studio.brunocasamassa.ajudaaqui.PedidosActivity;
import studio.brunocasamassa.ajudaaqui.SobreActivity;
/**
* Created by bruno on 24/04/2017.
*/
public class NavigationDrawer {
//NAVIGATION DRAWER
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
//private static Activity setClasse = new Activity();
private static MainActivity main;
private static User usuario = main.user;
public void createDrawer(final Activity classe, Toolbar toolbar) {
//setClasse = classe;
//Itens do Drawer
PrimaryDrawerItem item1 = new PrimaryDrawerItem().withIdentifier(1).withName(R.string.menu_pedidos);
PrimaryDrawerItem item2 = new PrimaryDrawerItem().withIdentifier(2).withName(R.string.menu_chats);
PrimaryDrawerItem item3 = new PrimaryDrawerItem().withIdentifier(3).withName(R.string.menu_grupos);
PrimaryDrawerItem item4 = new PrimaryDrawerItem().withIdentifier(4).withName(R.string.menu_perfil);
PrimaryDrawerItem item5 = new PrimaryDrawerItem().withIdentifier(5).withName(R.string.menu_configuracoes);
PrimaryDrawerItem item6 = new PrimaryDrawerItem().withIdentifier(6).withName(R.string.menu_sobre);
// Create the Navigation Drawer AccountHeader
AccountHeader headerResult = new AccountHeaderBuilder()
.withActivity(classe)
.withHeaderBackground(R.color.colorPrimary)
.addProfiles(
new ProfileDrawerItem().withName("User").withEmail("[email protected]").withIcon(usuario.getProfileImageURL())
)
.withOnAccountHeaderListener(new AccountHeader.OnAccountHeaderListener() {
@Override
public boolean onProfileChanged(View view, IProfile profile, boolean currentProfile) {
return false;
}
})
.build();
//Definition Drawer
Drawer drawer = new DrawerBuilder()
.withActivity(classe)
.withToolbar(toolbar)
.withAccountHeader(headerResult)
.addDrawerItems(
item1,
new DividerDrawerItem(),//Divisor
item2,
new DividerDrawerItem(),//Divisor
/*DIVISAO COM MENSAGEM new SectionDrawerItem().withName(R.string.section),//Seção*/
item3,
new DividerDrawerItem(),//Divisor
item4,
new DividerDrawerItem(),//Divisor
item5,
new DividerDrawerItem(),//Divisor
item6
//Divisor
)
.withOnDrawerItemClickListener(new Drawer.OnDrawerItemClickListener() {
@Override
public boolean onItemClick(View view, int position, IDrawerItem drawerItem) {
StartActivity a = new StartActivity() ;
a.verifyActivity(classe, position);
return false;
}
})
.withSelectedItemByPosition(0)
.build();
}
}
class StartActivity extends AppCompatActivity {
public void verifyActivity(Activity classe, int position) {
if (position == 1) {
// HERE I AM TRYING USING DIFFERENT FORMS TO START THE ACTITIVIES
startActivity(new Intent(classe, PedidosActivity.class));
}
if (position == 3) {
startActivity(new Intent(classe, ChatActivity.class));
}
if (position == 5) {
startActivity(new Intent(classe, GruposActivity.class));
}
if (position == 7) {
startActivity(new Intent(classe, PerfilActivity.class));
}
if (position == 9) {
startActivity(new Intent(classe, SobreActivity.class));
}
}
}
はMY PedidosActivityは（私はここでナビゲーターを呼び出す）IS：
package studio.brunocasamassa.ajudaaqui;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.RequiresApi;
import android.support.v4.content.ContextCompat;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.ListView;
import com.facebook.login.LoginResult;
import studio.brunocasamassa.ajudaaqui.helper.NavigationDrawer;
import studio.brunocasamassa.ajudaaqui.helper.PedidosTabAdapter;
import studio.brunocasamassa.ajudaaqui.helper.SlidingTabLayout;
import studio.brunocasamassa.ajudaaqui.helper.User;
/**
* Created by bruno on 24/04/2017.
*/
public class PedidosActivity extends AppCompatActivity {
private Toolbar toolbar;
private ListView listview_nomes;
private ViewPager viewPager;
private SlidingTabLayout slidingTabLayout;
public int posicao;
private LoginResult loginResult;
private MainActivity main;
private User usuario;
private static NavigationDrawer navigator = new NavigationDrawer();
@RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_hello);
toolbar = (Toolbar) findViewById(R.id.toolbar_principal);
toolbar.setTitle(getResources().getString(R.string.menu_pedidos));
//toolbar.setTitleTextColor(getResources().getColor(R.color.colorPrimaryDark));
setSupportActionBar(toolbar);
/*
loginResult = MainActivity.lr;
Profile profile = Profile.getCurrentProfile();
System.out.println("PROFILE: "+ profile);
String userid = loginResult.getAccessToken().getUserId();
String name = message(profile);
user.setName(name);*/
usuario = main.user;
System.out.println("USER: " + usuario.getName());
String username = usuario.getName();
loginResult=main.lr;
String userImg = usuario.getProfileImg();
listview_nomes = (ListView) findViewById(R.id.ListContatos);
viewPager = (ViewPager) findViewById(R.id.vp_pagina);
slidingTabLayout = (SlidingTabLayout) findViewById(R.id.stl_tabs);
slidingTabLayout.setDistributeEvenly(true);
slidingTabLayout.setSelectedIndicatorColors(ContextCompat.getColor(this, R.color.colorAccent));
PedidosTabAdapter pedidosTabAdapter = new PedidosTabAdapter(getSupportFragmentManager());
viewPager.setAdapter(pedidosTabAdapter);
slidingTabLayout.setViewPager(viewPager);
navigator.createDrawer(PedidosActivity.this, toolbar);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_exit:
//logoutUser();
return true;
case R.id.action_settings:
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
誰かが助けることができたら、それは非常に感謝します
どのラインでは？それを答えてください。 –
例外メッセージを貼り付けてください。 – Crash
[NullPointerExceptionとは何か、それを修正するにはどうすればいいですか？]（http://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it） ） – Gary99