如何使用java在android中使用viewpager 2和navigationdrawer编程应用程序

编程问答 2022-07-26

问题描述

我正在使用 Java 作为编程语言在 android studio 中制作一个应用程序。该应用程序由一个导航抽屉和一个从 main.java 调用的 viewpager2 组成，在编译项目时它不会给出任何错误，但由于某种原因应用程序崩溃并且无法工作。他们可以提供帮助，因为这对我来说是一个重要的项目。

main.java:

ViewTreeviewmodelStoreOwner

适配器：

import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.Toolbar;
import androidx.core.view.GravityCompat;
import androidx.drawerlayout.widget.DrawerLayout;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import androidx.viewpager2.widget.ViewPager2;

import android.annotation.SuppressLint;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.MenuItem;
import android.widget.Toast;

import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.google.android.material.navigation.NavigationView;

import Fragments.genera_debate;
import Fragments.perfil_user;

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
    DrawerLayout drawerLayout;
    ActionBarDrawerToggle actionBarDrawerToggle;
    Toolbar toolbar;
    NavigationView navigationView;
    //variables para cargar el fragment
    FragmentManager fragmentManager;
    FragmentTransaction fragmentTransaction;
    String personName;
    ViewPager2 viewPager2;
    BottomNavigationView  bottomNavigationView;
    ViewPagerAdapter adapter;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toolbar=findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);//se pasa el toolbar
        drawerLayout=findViewById(R.id.drawer);
        navigationView=findViewById(R.id.navigationView);
        navigationView.setNavigationItemSelectedListener(this);
        actionBarDrawerToggle=new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.open,R.string.close);
        drawerLayout.addDrawerListener(actionBarDrawerToggle);
        actionBarDrawerToggle.setDrawerIndicatorEnabled(true);
        actionBarDrawerToggle.syncState();
        //cargar fragment principal
        FragmentManager fragmentManager;
        FragmentTransaction fragmentTransaction;
        fragmentManager=getSupportFragmentManager();
        //cargar viewpager2
        fragmentTransaction=fragmentManager.beginTransaction();
        fragmentTransaction.add(R.id.container,new perfil_user());
        fragmentTransaction.commit();
        initView();


    }


    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        if (item.getItemId() == R.id.user){
            FragmentManager fragmentManager;
            FragmentTransaction fragmentTransaction;
            fragmentManager=getSupportFragmentManager();
            fragmentTransaction=fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.container,new perfil_user());
            fragmentTransaction.commit();

        }
        else if (item.getItemId() == R.id.exit){
            //finish();
            loggin login=new loggin();
            login.signOut();
        }
        //aquí van las otros fragment
        drawerLayout.closeDrawer(GravityCompat.START);
        return false;
    }
    private void initView() {
        viewPager2 = findViewById(R.id.vp_horizontal_ntb);
        viewPager2.setoffscreenPageLimit(100);
        bottomNavigationView = findViewById(R.id.navigation);
        adapter = new ViewPagerAdapter(this);
        viewPager2.setAdapter(adapter);


       bottomNavigationView.setonNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
           @Override
           public boolean onNavigationItemSelected(@NonNull MenuItem item) {
               Fragment fragment=new perfil_user();
               switch (item.getItemId()){
                   case R.id.perfil:
                       fragment=new perfil_user();
                       break;
                   case R.id.generar_debate:
                       fragment=new genera_debate();
                       break;
               }
               getSupportFragmentManager().beginTransaction().add(R.id.container,fragment).commit();
               return false;
           }
       });



    }
}

main.xml:

import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.viewpager2.adapter.FragmentStateAdapter;

import Fragments.genera_debate;
import Fragments.perfil_user;

public class ViewPagerAdapter extends FragmentStateAdapter {
    public ViewPagerAdapter(@NonNull MainActivity fragment) {
        super(fragment);
    }

    @NonNull
    @Override
    public Fragment createFragment(int position) {
        switch (position){
            case 1:
                return new perfil_user();
            case 2:
                return new genera_debate();
            default:
                return null;

        }
    }

    @Override
    public int getItemCount() {
        return 2;
    }
}

抽屉工具栏.xml：

<androidx.drawerlayout.widget.DrawerLayout 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:id="@+id/drawer"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <include
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        layout="@layout/drawer_toolbar"
        >

    </include>
    <include
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        layout="@layout/content_main"
        >

    </include>
    <com.google.android.material.navigation.NavigationView
        android:id="@+id/navigationView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:menu="@menu/drawer_menu"
        app:headerLayout="@layout/drawer_header"
        android:layout_gravity="start"
        android:fitsSystemWindows="true"
        >

    </com.google.android.material.navigation.NavigationView>



</androidx.drawerlayout.widget.DrawerLayout>

我还有 2 个 fragment.java 和 2 个 fragment.xml，我认为不需要添加

给我的错误

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
<androidx.appcompat.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="#067B30"
    android:theme="@style/ThemeOverlay.AppCompat.Dark"
>

</androidx.appcompat.widget.Toolbar>
    <com.google.android.material.appbar.AppBarLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:elevation="0dp"/>
    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/navigation"
        app:menu="@menu/bottom_navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom"
        android:background="?android:attr/windowBackground"
        android:foreground="?attr/selectableItemBackground" />

    <androidx.viewpager2.widget.ViewPager2
        android:id="@+id/vp_horizontal_ntb"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />



</LinearLayout>

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

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