单击tabLayout上的某些选项卡时，应用程序崩溃

时间：2017-03-26 11:49:32

标签： android android-viewpager android-tabs android-tablayout

我正在开发一款Android应用，它有4个标签，包含4个片段。我在Android设备上运行了该应用。但我遇到的问题是，当我点击前两个标签时，它工作正常，但是当我打开第3和第4个标签时，APP立即崩溃！

最初，我认为第3和第4个碎片上有一个错误，但我后来发现这不是第3或第4个碎片错误。我用第3和第4个片段替换了第1个和第2个片段，第1个和第2个片段用第3个和第4个片段替换。同样的事情仍然发生了！

这是我的main_activity.java。

public class Main_activity extends AppCompatActivity {

@Bind(R.id.main_activity)
View mView;
private int[] tabIcons = {
        R.drawable.friend_chat,
        R.drawable.call,
        R.drawable.tab_contact,
        R.drawable.profile
};
private TabLayout tabLayout;
private FragmentManager mFragmentManager;
private FragmentTransaction mFragmentTransaction;

private NonSwipeableViewPager viewPager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);

    mFragmentManager = getSupportFragmentManager();
    mFragmentTransaction = mFragmentManager.beginTransaction();
    mFragmentTransaction.replace(R.id.viewpager, new ConversationsFragment()).commit();


    viewPager = (NonSwipeableViewPager) findViewById(R.id.viewpager);
    setupViewPager(viewPager);

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

    setupTabIcons();

}

   private void setupTabIcons() {
    tabLayout.getTabAt(0).setIcon(tabIcons[0]);
    tabLayout.getTabAt(1).setIcon(tabIcons[1]);
    tabLayout.getTabAt(2).setIcon(tabIcons[2]);
    tabLayout.getTabAt(3).setIcon(tabIcons[3]);

    int tabIconColor = ContextCompat.getColor(Main_Intergister.this, R.color.holo_red_dark);

    tabLayout.getTabAt(0).getIcon().setColorFilter(tabIconColor, PorterDuff.Mode.SRC_IN);
    tabLayout.getTabAt(1).getIcon().setColorFilter(Color.parseColor("#a0a3a7"), PorterDuff.Mode.SRC_IN);
    tabLayout.getTabAt(2).getIcon().setColorFilter(Color.parseColor("#a0a3a7"), PorterDuff.Mode.SRC_IN);
    tabLayout.getTabAt(3).getIcon().setColorFilter(Color.parseColor("#a0a3a7"), PorterDuff.Mode.SRC_IN);


    ColorStateList colors;
    if (Build.VERSION.SDK_INT >= 23) {
        colors = getResources().getColorStateList(R.color.ash, getTheme());
    }
    else {
        colors = getResources().getColorStateList(R.color.ash);
    }

    for (int i = 0; i < tabLayout.getTabCount(); i++) {
        TabLayout.Tab tab = tabLayout.getTabAt(i);
        assert tab != null;
        Drawable icon = tab.getIcon();

        if (icon != null) {
            icon = DrawableCompat.wrap(icon);
            DrawableCompat.setTintList(icon, colors);
        }
    }

    tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
        @Override
        public void onTabSelected(TabLayout.Tab tab) {
            tab.getIcon().setColorFilter(tabIconColor, PorterDuff.Mode.SRC_IN);


            switch (tab.getPosition()) {
                case 0:
                    viewPager.setCurrentItem(0);
                    break;
                case 1:
                  viewPager.setCurrentItem(1);
                    break;
                case 2:
                    viewPager.setCurrentItem(2);
                case 3:
                    viewPager.setCurrentItem(3);
                    break;
                default:
                    break;
            }

        }

        @Override
        public void onTabUnselected(TabLayout.Tab tab) {
            tab.getIcon().setColorFilter(Color.parseColor("#a0a3a7"), PorterDuff.Mode.SRC_IN);

        }

        @Override
        public void onTabReselected(TabLayout.Tab tab) {


        }
    });
}

    private void setupViewPager(NonSwipeableViewPager viewPager) {
    ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
    adapter.addFragment(new ConversationsFragment(), "Chats");
    adapter.addFragment(new ContactsFragment(), "Calls");
    adapter.addFragment(new CallsFragment(), "Contacts");
    adapter.addFragment(new Profile_fragment(), "Profile");
    viewPager.setAdapter(adapter);
}

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

    public ViewPagerAdapter(FragmentManager manager) {
        super(manager);
    }

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

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

    public void addFragment(Fragment fragment, String title) {
        mFragmentList.add(fragment);
        mFragmentTitleList.add(title);
    }

    @Override
    public CharSequence getPageTitle(int position) {
        return null;
    }
     }
 }

这是我的main_activity.xml。

<?xml version="1.0" encoding="utf-8"?> <android.support.design.widget.CoordinatorLayout 
 xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/main_activity"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:fitsSystemWindows="true">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

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

            <android.support.v7.widget.CardView
                xmlns:card_view="http://schemas.android.com/apk/res-auto"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                card_view:cardElevation="4dp"
                card_view:cardCornerRadius="0dp">

            <android.support.v7.widget.Toolbar
                android:layout_width="match_parent"
                android:id="@+id/toolbar"
                android:layout_height="?attr/actionBarSize"
                android:background="@color/white"
                app:layout_scrollFlags="scroll|enterAlways"
                app:elevation="6dp"
                app:popupTheme="@style/AppTheme.PopupOverlay">


                <TextView
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:id="@+id/toolbar_app_name"
                    android:text="@string/app_name"
                    android:textColor="@color/holo_red_dark"
                    android:textSize="30sp"
                    android:textStyle="bold"/>
            </android.support.v7.widget.Toolbar>

            </android.support.v7.widget.CardView>
        </android.support.design.widget.AppBarLayout>

        <com.solid.helpers.NonSwipeableViewPager
            android:id="@+id/viewpager"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"  />

        <android.support.v7.widget.CardView
            xmlns:card_view="http://schemas.android.com/apk/res-auto"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            card_view:cardElevation="4dp"
            card_view:cardCornerRadius="0dp">


        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:tabMode="fixed"
            app:tabIndicatorColor="@color/white"
            app:tabIndicatorHeight="8dp"
            app:elevation="6dp"
            app:tabGravity="fill"
            android:background="@color/white"/>

        </android.support.v7.widget.CardView>

    </LinearLayout>

</RelativeLayout>



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

1 个答案:

答案 0 :(得分：2)

由于您有4个标签，请尝试在main_activity onCreate事件下添加以下代码，看看它是否可以解决您的问题。

viewpager.setOffscreenPageLimit（4）;

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