我的应用程序不断崩溃（致命异常）

Question

我的应用程序打开与启动屏幕正常，但不能继续到主屏幕和崩溃！我正在尝试使tablayout（代码中没有错误）

public class MainActivity extends FragmentActivity {
private TabLayout tabLayout;
private AppBarLayout appBarLayout;
private ViewPager viewPager;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    tabLayout = findViewById(R.id.tablayout_id);
    appBarLayout = findViewById(R.id.appbarid);
    viewPager = findViewById(R.id.viewpager_id);
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());

    adapter.AddFragment(new FragmentQuiz(),"Quiz");
    adapter.AddFragment(new FragmentExplore(), "Explore");
    adapter.AddFragment(new FragmentStore(), "Store");

    viewPager.setAdapter(adapter);
    tabLayout.setupWithViewPager(viewPager);
}}

<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"
tools:context=".MainActivity"
android:orientation="vertical">


<android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:layout_gravity="center"
    app:elevation="0dp"
    android:id="@+id/appbarid">

    <ImageView
        android:id="@+id/iv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:src="@drawable/image" />

</android.support.design.widget.AppBarLayout>
<android.support.design.widget.TabLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:tabGravity="fill"
    app:tabMode="fixed"
    android:id="@+id/tablayout_id"
    app:tabTextColor="@color/tabtextcolor"
    app:tabIndicatorColor="@color/tabindicatorcolor"
    android:background="@color/tab"/>
<android.support.v4.view.ViewPager
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/viewpager_id"
    >
</android.support.v4.view.ViewPager>

Answer 1

您需要在AndroidManifest.xml中为应用程序定义主题，例如：

<application
.....
        android:theme="@style/Theme">

并在values/styles.xml文件中定义了此样式，如下所示：

<style name="Theme" parent="Theme.AppCompat.Light">
.....
</style>