小编kov*_*777的帖子

我使用新的 android 小部件 ViewPager2 版本 1.0.0-alpha03，当我在它上面设置点击侦听器时，方法 onClick() 没有被调用。

我的活动课：

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        supportFragmentManager.beginTransaction()
            .add(R.id.fragmentContent, SecondFragment.newInstance(), SecondFragment.TAG)
            .addToBackStack(SecondFragment.TAG)
            .commit()
    }
}

我的片段：

class SecondFragment : Fragment() {

    companion object {
        val TAG = SecondFragment::class.java.canonicalName

        fun newInstance(): SecondFragment = SecondFragment()
    }

    override fun onCreateView(
        inflater: LayoutInflater,
        container: ViewGroup?,
        savedInstanceState: Bundle?
    ): View? {
        return inflater.inflate(R.layout.fragment_second, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        viewPager2.setOnClickListener {
            Log.d("logi", "click : ")
        }
    } …

我在 ChipGroup 中有 Chips，在 Horizo​​ntalScrollView 中有这个 ChipGroup。但我的问题是最后一个芯片上的 marginEnd 不工作！

我尝试以编程方式更改布局参数，但没有成功

<HorizontalScrollView
    android:id="@+id/chips_container"
    android:layout_width="0dp"
    android:layout_height="56dp"
    android:layout_gravity="center_vertical"
    android:visibility="gone"
    app:layout_constraintBottom_toTopOf="@+id/dividerSmartReplies"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    tools:visibility="visible">

    <com.google.android.material.chip.ChipGroup
        android:id="@+id/chip_group"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        app:chipSpacing="8dp"
        app:singleLine="true"
        app:singleSelection="true">

        <com.google.android.material.chip.Chip
            style="@style/Widget.MaterialComponents.Chip.Choice"
            android:layout_width="wrap_content"
            android:layout_height="42dp"
            android:layout_marginStart="8dp"
            android:textColor="@color/selector_smart_reply_chip_text"
            app:checkedIconVisible="false"
            app:chipBackgroundColor="@color/selector_smart_reply_chip"
            app:chipCornerRadius="21dp"
            app:chipStrokeColor="@color/app_base_blue"
            app:chipStrokeWidth="1dp" />

        <com.google.android.material.chip.Chip
            style="@style/Widget.MaterialComponents.Chip.Choice"
            android:layout_width="wrap_content"
            android:layout_height="42dp"
            android:textColor="@color/selector_smart_reply_chip_text"
            app:checkedIconVisible="false"
            app:chipBackgroundColor="@color/selector_smart_reply_chip"
            app:chipCornerRadius="21dp"
            app:chipStrokeColor="@color/app_base_blue"
            app:chipStrokeWidth="1dp" />

        <com.google.android.material.chip.Chip
            style="@style/Widget.MaterialComponents.Chip.Choice"
            android:layout_width="wrap_content"
            android:layout_height="42dp"
            android:textColor="@color/selector_smart_reply_chip_text"
            app:checkedIconVisible="false"
            app:chipBackgroundColor="@color/selector_smart_reply_chip"
            app:chipCornerRadius="21dp"
            app:chipStrokeColor="@color/app_base_blue"
            app:chipStrokeWidth="1dp" />

        <com.google.android.material.chip.Chip
            style="@style/Widget.MaterialComponents.Chip.Choice"
            android:layout_width="wrap_content"
            android:layout_height="42dp"
            android:layout_marginEnd="8dp"
            android:textColor="@color/selector_smart_reply_chip_text"
            app:checkedIconVisible="false"
            app:chipBackgroundColor="@color/selector_smart_reply_chip"
            app:chipCornerRadius="21dp"
            app:chipStrokeColor="@color/app_base_blue"
            app:chipStrokeWidth="1dp" />
    </com.google.android.material.chip.ChipGroup>

</HorizontalScrollView>

最后一个芯片后我需要额外的空间。ChipGroup 的 padding 有效，但没有预期的 …

我正在尝试使用新的android体系结构组件，但是一时我很困惑。

我创建了一个ViewModel类

public class BuyViewModel extends ViewModel {

private BuyRepository buyRepository;
private LiveData<Adverts> advertsLiveData;
private boolean isLoading;
private int currentPage;

@Inject
public BuyViewModel(BuyRepository buyRepository) {
    this.buyRepository = buyRepository;
}

public void init(int currentPage) {
    this.currentPage = currentPage;
    if (this.advertsLiveData != null) {
        return;
    }
    Timber.tag("logi").d("BuyViewModel > init -> ");
    advertsLiveData = buyRepository.getAdverts(currentPage);
}

public LiveData<Adverts> getAdvertsLiveData() {
    return advertsLiveData;
}
}

在我的LifeCycleFragment中观察LiveData

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
    super.onActivityCreated(savedInstanceState);

    buyViewModel = ViewModelProviders.of(this, viewModelFactory).get(BuyViewModel.class);
    buyViewModel.init(1);
    buyViewModel.getAdvertsLiveData().observe(this, adverts -> {
        Timber.tag("logi").d("BuyFragment …