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有一个活动的碎片容器，其中一个活动的开始添加了ViewPagerFragment。 MainFragment内部有一个RecyclerView（它是标签），显示但没有填充数据。 试图改变宽度和高从0到Match_Parent和Fixed_Size。也改变ConstraintLayout到RelativeLayout.Using主题android:theme="@style/MyMaterialTheme" style.xmlRecyclerView没有附加任何适配器
<style name="MyMaterialTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="windowNoTitle">true</item>
<item name="windowActionBar">false</item>
<item name="colorPrimary">@color/colorPrimary</item>
<item name="colorPrimaryDark">@color/colorPrimaryDark</item>
<item name="colorAccent">@color/colorAccent</item>
</style>
<style name="MyMaterialTheme" parent="MyMaterialTheme.Base">
</style>
E/RecyclerView：无适配器连接;跳过
MainActivity.class 公共类MainActivity延伸AppCompatActivity {
private static final String TAG = "MainActivity";
private AdView mAdView;
private FragmentTransaction mFragmentTransaction;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAdView = (AdView) findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder()
.addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
.build();
mAdView.loadAd(adRequest);
mFragmentTransaction = getSupportFragmentManager()
.beginTransaction()
.add(R.id.container_frame, new ViewPagerFragment());
mFragmentTransaction.commit();
}
@Override
protected void onResume() {
super.onResume();
mAdView.resume();
}
@Override
protected void onPause() {
super.onPause();
mAdView.pause();
}
@Override
protected void onDestroy() {
mAdView.destroy();
super.onDestroy();
}
activity_main.xml中
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:ads="http://schemas.android.com/apk/res-auto"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/colorPrimaryDark"
tools:context="com.newakkoff.justad.Activities.MainActivity">
<RelativeLayout
ads:layout_constraintBottom_toTopOf="@+id/adView"
ads:layout_constraintTop_toTopOf="parent"
ads:layout_constraintLeft_toLeftOf="parent"
ads:layout_constraintRight_toRightOf="parent"
android:id="@+id/container_frame"
android:layout_width="match_parent"
android:layout_height="match_parent">
</RelativeLayout>
<com.google.android.gms.ads.AdView
android:id="@+id/adView"
android:layout_width="0dp"
ads:adSize="BANNER"
ads:adUnitId="@string/banner_ad_unit_id"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
tools:layout_constraintRight_creator="1"
tools:layout_constraintLeft_creator="1"
android:layout_height="50dp">
</com.google.android.gms.ads.AdView>
</android.support.constraint.ConstraintLayout>
ViewPagerFragment.class
public class ViewPagerFragment extends Fragment {
private ViewPager mViewPager;
private Toolbar mToolbar;
private TabLayout mTableLayout;
int i = 1;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_view_pager, container, false) ;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mToolbar = (Toolbar) view.findViewById(R.id.toolbar);
((AppCompatActivity) getActivity()).setSupportActionBar(mToolbar);
((AppCompatActivity) getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(false);
mViewPager = (ViewPager) view.findViewById(R.id.view_pager_main);
mViewPager.setAdapter(new CustomPagerAdapter(getActivity()));
mViewPager.setCurrentItem(1);
mTableLayout = (TabLayout) view.findViewById(R.id.tabs);
mTableLayout.setupWithViewPager(mViewPager);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_main, menu);
super.onCreateOptionsMenu(menu, inflater);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
}
}
fragment_view_pager.xm升
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.AppBarLayout
android:layout_width="0dp"
android:layout_height="wrap_content"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
android:id="@+id/appBarLayout"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintTop_toTopOf="parent">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
/>
<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/view_pager_main"
app:layout_constraintTop_toBottomOf="@+id/appBarLayout"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_width="0dp"
android:layout_height="0dp">
MainFragment.class
public class MainFragment extends Fragment {
private RecyclerView mRecyclerView;
private MyAdapter mAdapter;
private LinearLayoutManager mLayoutManager;
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mLayoutManager = new LinearLayoutManager(this.getActivity(),LinearLayoutManager.VERTICAL,false);
mAdapter = new MyAdapter(new String[]{"test one", "test two", "test three", "test four", "test five", "test six", "test seven"});
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_main, container, false);
mRecyclerView = (RecyclerView) view.findViewById(R.id.rv_recycler_view);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setAdapter(mAdapter);
return view;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
fragment_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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.support.v7.widget.RecyclerView
android:id="@+id/rv_recycler_view"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="8dp"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginLeft="8dp"
android:layout_marginEnd="8dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginRight="8dp"
android:layout_marginTop="8dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp"
tools:listitem="@layout/card_item"
android:background="@color/colorPrimary"/>
</android.support.constraint.ConstraintLayout>
CustomPageAdapter.class
public class CustomPagerAdapter extends PagerAdapter {
private Context mContext;
public CustomPagerAdapter(Context context) {
mContext = context;
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
ModelPager modelsPager = ModelPager.values()[position];
LayoutInflater inflater = LayoutInflater.from(mContext);
ViewGroup layout = (ViewGroup) inflater.inflate(modelsPager.getLayoutResId(), container, false);
container.addView(layout);
return layout;
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
container.removeView((View) object);
}
@Override
public int getCount() {
return ModelPager.values().length;
}
@Override
public boolean isViewFromObject(View view, Object object) {
return view == object;
}
@Override
public CharSequence getPageTitle(int position) {
ModelPager customPagerEnum = ModelPager.values()[position];
return mContext.getString(customPagerEnum.getTitleResId());
}
}
ModelPager.class
public enum ModelPager {
SEND_FRAGMENT(R.string.send_fragment_tab,R.layout.fragment_send),
MAIN_FRAGMENT(R.string.main_fragment_tab, R.layout.fragment_main),
ABOUT_FRAGMENT(R.string.about_fragment_tab, R.layout.fragment_about);
private int mTitleResId;
private int mLayoutResId;
ModelPager(int titleResId, int layoutResId) {
mTitleResId = titleResId;
mLayoutResId = layoutResId;
}
public int getTitleResId() {
return mTitleResId;
}
public int getLayoutResId() {
return mLayoutResId;
}
}
MyAdapter.class
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.MyViewHolder> {
private String[] mDataset;
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
static class MyViewHolder extends RecyclerView.ViewHolder {
private static final String TAG = "My Recycler Adapter";
CardView mCardView;
TextView mTextView;
MyViewHolder(View v) {
super(v);
v.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "Element " + getAdapterPosition() + " clicked.");
}
});
mCardView = (CardView) v.findViewById(R.id.card_view);
mTextView = (TextView) v.findViewById(R.id.tv_text);
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(String[] myDataset) {
mDataset = myDataset;
}
// Create new views (invoked by the layout manager)
@Override
public MyAdapter.MyViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_item, parent, false);
// set the view's size, margins, paddings and layout parameters
return new MyViewHolder(v);
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
holder.mTextView.setText(mDataset[position]);
}
@Override
public int getItemCount() {
return mDataset.length;
}
}
card_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="68dp" >
<android.support.v7.widget.CardView
android:id="@+id/card_view"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_margin="10dp"
android:layout_height="62dp"
card_view:cardCornerRadius="4dp"
card_view:elevation="14dp">
<TextView
android:id="@+id/tv_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#000000"
android:gravity="center" >
</TextView>
</android.support.v7.widget.CardView>
</RelativeLayout>
你可以发布'CustomPAgerAdapter'的代码吗？ –
@VeneetReddy补充说，你可以检查吗？ – newakkoff
为什么要将'RecyclerView'的'layout_height'和'layout_width'设置为0dp？ –