android viewpager 拖拽翻页时报数组下标越界是啥情况。

Posted 2023-05-02

FATAL EXCEPTION: main
06-23 05:50:21.217 E/androidRuntime( 1377): java.lang.IndexOutOfBoundsException: Invalid index 0, size is 0
06-23 05:50:21.217 E/AndroidRuntime( 1377): at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:251)
06-23 05:50:21.217 E/AndroidRuntime( 1377): at java.util.ArrayList.get(ArrayList.java:304)
06-23 05:50:21.217 E/AndroidRuntime( 1377): at android.support.v4.view.ViewPager.performDrag(ViewPager.java:2057)
06-23 05:50:21.217 E/AndroidRuntime( 1377): at android.support.v4.view.ViewPager.onTouchEvent(ViewPager.java:1987)
06-23 05:50:21.217 E/AndroidRuntime( 1377): at android.view.View.dispatchTouchEvent(View.java:7246)
请注意，是Viewpager内部的方法报错。

参考技术A 就是你没有限制它的最大的数目啊，这样肯定超出了它的范围，当然就不行了会报错啊追问

请注意，是Viewpager内部的方法报错。
不是我写的代码里的数组。

本回答被提问者采纳

用TabLayout+ViewPager+Fragment控件实现简单的翻页效果 --Android--

1.效果展示

 

1.导入依赖

implementation ‘com.google.android.material:material:1.0.0‘

2.新建Fragment1

　　2.1fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:gravity="center"
        android:text="hello"
        android:textSize="45dp"
        android:id="@+id/tvName"/>


</LinearLayout>

3.新建MainActivity

　　3.1 activity_main.xml

<?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"
    tools:context=".MainActivity">
    <com.google.android.material.tabs.TabLayout
        android:layout_width="match_parent"
        android:id="@+id/tl_tabs"
        android:layout_height="40dp"/>
    <androidx.viewpager.widget.ViewPager
        android:id="@+id/vp_content"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

    </androidx.viewpager.widget.ViewPager>
</LinearLayout>

　　3.2 MainActivity.class

public class MainActivity extends AppCompatActivity {


    private TabLayout tlTabs;
    private ViewPager vpContent;

    List<Fragment> fragments = new ArrayList<>();
    List<String> titles = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initViews();
        fragments.add(new MyFragment("第一页"));
        fragments.add(new MyFragment("第二页"));
        fragments.add(new MyFragment("第三页"));
        fragments.add(new MyFragment("第四页"));
        fragments.add(new MyFragment("第五页"));
        titles.add("第一页");
        titles.add("第二页");
        titles.add("第三页");
        titles.add("第四页");
        titles.add("第五页");
        vpContent.setAdapter(new FragmentStatePagerAdapter(getSupportFragmentManager()) {
            @Override
            public Fragment getItem(int position) {
                return fragments.get(position);
            }

            @Override
            public int getCount() {
                return fragments.size();
            }

            @Override
            public void destroyItem(ViewGroup container, int position, Object object) {
                super.destroyItem(container, position, object);
            }

            @Nullable
            @Override
            public CharSequence getPageTitle(int position) {

                return titles.get(position);
            }
        });

        tlTabs.setupWithViewPager(vpContent);
    }


    private void initViews() {
        tlTabs = findViewById(R.id.tl_tabs);
        vpContent = findViewById(R.id.vp_content);
    }

    public static class MyFragment extends Fragment {
        String name;
        private TextView tvName;

        public MyFragment(String s) {
            name = s;
        }

        @Nullable
        @Override
        public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
            View view = inflater.inflate(R.layout.fragment1, null);
            initViews(view);
            tvName.setText(name);
            return view;
        }

        private void initViews(View view) {
            tvName = view.findViewById(R.id.tvName);
        }
    }
}

点击下载源码:[下载]

源码下载:https://github.com/ldy731729142/TabLayoutDemo