Question

问题在于标签活动。当我运行这个应用程序时工作正常。但是当我滑动或点击标签时，它完全关闭。请任何人帮助我。

11-14 12:08:12.460 30777-30777/? I/art: Late-enabling -Xcheck:jni
11-14 12:08:12.535 30777-30777/? I/System.out: Sending WAIT chunk
11-14 12:08:12.729 30777-30783/com.example.mn.tabt I/art: Debugger is active
11-14 12:08:12.736 30777-30777/com.example.mn.tabt I/System.out: Debugger has connected
11-14 12:08:12.736 30777-30777/com.example.mn.tabt I/System.out: waiting for debugger to settle...
11-14 12:08:12.936 30777-30777/com.example.mn.tabt I/System.out: waiting for debugger to settle...
11-14 12:08:13.136 30777-30777/com.example.mn.tabt I/System.out: waiting for debugger to settle...
11-14 12:08:13.336 30777-30777/com.example.mn.tabt I/System.out: waiting for debugger to settle...
11-14 12:08:13.537 30777-30777/com.example.mn.tabt I/System.out: waiting for debugger to settle...
11-14 12:08:13.737 30777-30777/com.example.mn.tabt I/System.out: waiting for debugger to settle...
11-14 12:08:13.938 30777-30777/com.example.mn.tabt I/System.out: waiting for debugger to settle...
11-14 12:08:14.138 30777-30777/com.example.mn.tabt I/System.out: waiting for debugger to settle...
11-14 12:08:14.339 30777-30777/com.example.mn.tabt I/System.out: debugger has settled (1406)
11-14 12:08:14.356 30777-30777/com.example.mn.tabt W/System: ClassLoader referenced unknown path: /data/app/com.example.mn.tabt-1/lib/arm64
11-14 12:08:14.399 30777-30777/com.example.mn.tabt W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
11-14 12:08:14.544 30777-30777/com.example.mn.tabt I/HwSecImmHelper: mSecurityInputMethodService is null
11-14 12:08:14.557 30777-30777/com.example.mn.tabt E/HAL: load: id=gralloc != hmi->id=gralloc
11-14 12:08:14.649 30777-30849/com.example.mn.tabt E/HAL: load: id=gralloc != hmi->id=gralloc
11-14 12:08:14.649 30777-30849/com.example.mn.tabt I/OpenGLRenderer: Initialized EGL, version 1.4
11-14 12:08:14.655 30777-30849/com.example.mn.tabt W/OpenGLRenderer: load: so=/system/lib64/libhwuibp.so
                                                                     dlopen failed: library "/system/lib64/libhwuibp.so" not found
11-14 12:08:14.655 30777-30849/com.example.mn.tabt W/OpenGLRenderer: Initialize Binary Program Cache: Load Failed
11-14 12:08:14.655 30777-30849/com.example.mn.tabt E/HAL: load: id=gralloc != hmi->id=gralloc
11-14 12:08:21.698 30777-30777/com.example.mn.tabt I/Process: Sending signal. PID: 30777 SIG: 9

这里是logcat文件。应用程序运行顺畅，但当我尝试查找选项卡时，它会很紧张。

    public class tab1 extends Fragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.tab1, container, false);
        return rootView;
    }

}

`

这里是tab1类。同样，我创建了两个class.for 3片段。 `

<android.support.design.widget.AppBarLayout
    android:id="@+id/appbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingTop="@dimen/appbar_padding_top"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|enterAlways"
        app:popupTheme="@style/AppTheme.PopupOverlay">

    </android.support.v7.widget.Toolbar>
    <android.support.design.widget.TabLayout
        android:id="@+id/tabs"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

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

<android.support.v4.view.ViewPager
    android:id="@+id/container"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="end|bottom"
    android:layout_margin="@dimen/fab_margin"
    app:srcCompat="@android:drawable/ic_dialog_email" />

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

如果有人想查看主类的xml文件。这里是。

`

block

`

Answer 1

 @Override
    public Fragment getItem(int position) {
        switch (position) {
            case 0:
                tab1 tab1 = new tab1();
                return tab1;

            case 1:
                tab2 tab2 = new tab2();
                return tab2;
            case 3: // Should be 2
                tab3 tab3 =new tab3();
                return tab3;

            default: return null ;
        }

首先，请纠正 CASE 部分。

 case 2: 
            tab3 tab3 =new tab3();
            return tab3;

禁用即时运行。

Answer 2

此问题还有另一种解决方案

private ViewPager mViewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);


    // Set up the ViewPager with the sections adapter.
    mViewPager = (ViewPager) findViewById(R.id.container);
    setupViewPager(mViewPager); //Replace your line to this

    TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
    tabLayout.setupWithViewPager(mViewPager);

    FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
                    .setAction("Action", null).show();
        }
    });
}

//method for adding fragment to the adapter

private void setupViewPager(ViewPager viewPager) {
    SectionsPagerAdapter adapter = new SectionsPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(new TabOne(), "ONE");
    adapter.addFragment(new TabSecond(), "TWO");
    adapter.addFragment(new TabThird(), "THREE");
    viewPager.setAdapter(adapter);
}


public class SectionsPagerAdapter extends FragmentPagerAdapter {
    private final List<Fragment> mFragmentList = new ArrayList<>();
    private final List<String> mFragmentTitleList = new ArrayList<>();

    public SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    // add this method in your adapter
    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public Fragment getItem(int position) {
        return mFragmentList.get(position);
    }

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

    @Override
    public CharSequence getPageTitle(int position) {
        return mFragmentTitleList.get(position);
    }
}

}

标签滑动 - 怎么样？

2 个答案: