小编mad*_*u s的帖子

Android Studio中的参考ID错误。它表明此方法已经查找了id。我给了与代码中使用的ID名称相同的名称，但是它不起作用。我已经尝试过链接ID并重用它，但是它显示了相同的错误。请需要帮助。错误消息图像在超级链接中。

这是我的代码

public class SignUp extends AppCompatActivity implements View.OnClickListener {

    Button btnSignup;
    TextView btnLogin,btnForgotPass;
    EditText input_email,input_pass;
    RelativeLayout activity_sign_up;

    private FirebaseAuth auth;
    Snackbar snackbar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sign_up);

        //View
        btnSignup = (Button)findViewById(R.id.signup_btn_register);
        btnLogin = (TextView)findViewById(R.id.signup_btn_login);
        btnForgotPass = (TextView)findViewById(R.id.signup_btn_forgot_pass);
        input_email = (EditText)findViewById(R.id.signup_email);
        input_pass = (EditText)findViewById(R.id.signup_password);
        activity_sign_up = (RelativeLayout)findViewById(R.id.activity_sign_up);
    }
}

你好，大家好我是想加tab layout在navigation drawer activity我从欢迎屏幕在Android Studio中创建的。但是当我尝试执行代码并运行应用程序崩溃，并呈现出与渲染问题的应用程序XML文件在这里的代码.xml文件

<?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"  
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.example.madhu.management.QuestionPaperActivity"
    tools:showIn="@layout/app_bar_question_paper">

    <android.support.design.widget.TabLayout
        android:id="@+id/tablayout_id"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorPrimary"
        app:tabGravity="fill"
        app:tabIndicatorColor="@color/colorAccent"
        app:tabMode="fixed">

        <android.support.v4.view.ViewPager
            android:id="@+id/viewpager_id"
            android:layout_width="match_parent"
            android:layout_height="match_parent">

        </android.support.v4.view.ViewPager>

    </android.support.design.widget.TabLayout>

</LinearLayout>`

这是.class文件

公共类QuestionPaperActivity扩展了AppCompatActivity，实现了NavigationView.OnNavigationItemSelectedListener {

    //declaring access specifiers for tablayout
private TabLayout tabLayout;
private ViewPager viewPager;
private ViewPagerAdapter adapter;


//declaring variables for navigation layout
    DrawerLayout drawer;
    NavigationView navigationView;
    Toolbar toolbar = null;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_question_paper);
        Toolbar …