Viewpager编程创建的Tablayout不工作

Question

activity班：

public class DynamicActivity extends AppCompatActivity{

    private LinearLayout mLinearLayout;
    private View mView;


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

        mLinearLayout = new LinearLayout(DynamicActivity.this);
        mLinearLayout.setOrientation(LinearLayout.VERTICAL);
        mLinearLayout.setLayoutParams(new LinearLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT));


        TabLayout tabLayout = new TabLayout(DynamicActivity.this);
        tabLayout.setLayoutParams(new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.WRAP_CONTENT));
        tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
        tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
        tabLayout.setBackgroundColor(Color.CYAN);
        mLinearLayout.addView(tabLayout);


        ViewPager viewPager = new ViewPager(DynamicActivity.this);
        viewPager.setLayoutParams(new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.WRAP_CONTENT));
        viewPager.setBackgroundColor(Color.BLUE);
        mLinearLayout.addView(viewPager);

        ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());
        viewPager.setAdapter(viewPagerAdapter);

        tabLayout.addTab(tabLayout.newTab());
        tabLayout.addTab(tabLayout.newTab());
        tabLayout.addTab(tabLayout.newTab());

        tabLayout.setupWithViewPager(viewPager);

        setContentView(mLinearLayout);
    }
}

**Adapter Class :**
public class ViewPagerAdapter extends FragmentStatePagerAdapter{
    public ViewPagerAdapter(FragmentManager fm) {
        super(fm);
    }

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

    @Override
    public Fragment getItem(int position) {
        return new TestFagment();
    }

    @Override
    public int getCount() {
        return 3;
    }
}

例外情况：

致命异常：main

E/AndroidRuntime：致命异常：主进程：com.example.locale.TablayoutDynamicSample.27084 java.lang.IllegalState异常：带有适配器com.example.locale.TablayoutDynamicSample.ViewPagerAdapter@3B0E90D6的ViewPager在Android.support.v4.app.FragmentStatePagerAdapter.StartupDate（FragmentStatePagerAdapter.87）在Android.support.v4.view.ViewPager.Populate（Android.support.v7.widget.contentframelayout.onMeasure(contentframelayout.java:139)在Android.view.view.measure(view.java:18580)在Android.support.v7.widget.actionbaroverlayout.onMeasure(actionbaroverlayout.java:5827)在Android.support.v7.widget.actionbaroverlayout.393)在Android.view.view.view.measure(view.java:5827)在.FrameLayout.onMeasure（FrameLayout.java:430)在com.android.internal.policy.impl.PhoneWindow$decoview.onMeasure（PhoneWindow.java:2897)在android.view.view.measure（view.java:18580)在android.view.view.measure（view.view.rootimpl.performMeasure（view.rootimpl.java:2248)在android.view.view.rootimpl.measurehiarchy（ain（ActivityThread.java:5951)在java.lang.Reflect.Method.Invoke（原生方法）在java.lang.Reflect.Method.Invoke（Method.java:372)在com.android.internal.os.zygoteInit$MethodAndargscaller.run（zygoteInit.java:1388)在com.android.internal.os.zygoteInit.main（zygoteInit.java:1183）

Answer 1

它说“vewpager with Adapter viewpageradapter@3b0e90d6 requires a view id”所以请尝试以下操作：

viewPager.setId(anyInteger);