我正在尝试SearchView从支持库实现.我希望用户使用它SearchView来过滤一部List电影RecyclerView.
到目前为止我已经按照了几个教程添加SearchView了ActionBar,但是我不确定从哪里开始.我看过几个例子,但是当你开始输入时,它们都没有显示结果.
这是我的MainActivity:
public class MainActivity extends ActionBarActivity {
RecyclerView mRecyclerView;
RecyclerView.LayoutManager mLayoutManager;
RecyclerView.Adapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recycler_view);
mRecyclerView = (RecyclerView) findViewById(R.id.recycler_view);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new CardAdapter() {
@Override
public Filter getFilter() {
return null;
}
};
mRecyclerView.setAdapter(mAdapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar …我在TabLayout内部使用Fragment显示三个固定标签并且标签正在工作,但即使我app:tabTextColor在布局中设置属性后它仍然不可见,它也不会显示标签文本.
NewFragment.java
public class NewFragment extends Fragment {
private RecyclerView mRecyclerView;
private RecyclerView.LayoutManager mLayoutManager;
private RecyclerView.Adapter mAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View inflatedView = inflater.inflate(R.layout.new_fragment, container, false);
TabLayout tabLayout = (TabLayout) inflatedView.findViewById(R.id.tabLayout);
tabLayout.addTab(tabLayout.newTab().setText("Tab 1"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 2"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 3"));
final ViewPager viewPager = (ViewPager) inflatedView.findViewById(R.id.viewpager);
LinearLayoutManager mLayoutManager = new LinearLayoutManager(getActivity());
mLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
viewPager.setAdapter(new PagerAdapter(getFragmentManager(), tabLayout.getTabCount()));
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setupWithViewPager(viewPager);
tabLayout.setTabMode(TabLayout.MODE_FIXED);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
} …目前AdView正在内部出现,ViewPager因此它阻止了应用程序中的内容.我怎样才能让它AdView出现在ViewPager而不是在里面.
我试图把它AdView放在一个RelativeLayout下面ViewPager然后AdView根本不显示.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.candyx.testapp.Activity">
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/main_button_background">
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways"/>
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="scrollable"
app:tabGravity="fill"
app:tabIndicatorColor="@color/colorTabIndicator"
app:tabIndicatorHeight="3dp"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="@+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="@string/appbar_scrolling_view_behavior"/>
<com.google.android.gms.ads.AdView
android:id="@+id/adView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
ads:adSize="BANNER"
ads:adUnitId="@string/banner_ad_unit_id"
android:layout_gravity="center|bottom"/>
</android.support.design.widget.CoordinatorLayout>
</LinearLayout>
我Navigation Drawer用来在片段之间导航,他们都使用MainActivity工具栏,但每个片段都有自己TabLayout的3个标签,在每个标签中,我RecyclerView用来显示不同的文本和图像.
我最后一次使用actvities而不是片段,但现在使用抽屉,它使用片段.
我已经到了标签可以工作的地步但是只要我放入ViewPager并将适配器连接到标签并且我从抽屉打开新片段我得到一个空指针这可能是什么问题？
MainActivity.java
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override …android android-fragments android-recyclerview android-tablayout
嗨大家我得到一个无法在我的OnCreateView方法中解析构造函数ArrayAdapter,我listAdapter试图在我的选项卡中列出文本数据,这是我的主要活动.任何帮助将不胜感激我仍然是一个noobie in Java.
public class MainActivity extends ActionBarActivity {
private Toolbar toolbar;
private ViewPager mPager;
private SlidingTabLayout mTabs;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(toolbar);
mPager= (ViewPager) findViewById(R.id.viewPager);
mTabs=(SlidingTabLayout) findViewById(R.id.tabs);
mPager.setAdapter(new MyPagerAdapter(getSupportFragmentManager()));
mTabs.setDistributeEvenly(true);
mTabs.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
mTabs.setSelectedIndicatorColors(getResources().getColor(R.color.colorAccent));
mTabs.setViewPager(mPager);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public …我正在使用RecyclerView列出一些文本,现在我想这样做,以便当用户点击文本时弹出自定义警报对话框.
到目前为止我已尝试过这个但是得到一个NullPointerException; 这可能有什么问题？
public class CBAdapter extends RecyclerView.Adapter<CBAdapter.ViewHolder> {
List<AdapterData> mItems;
public CBAdapter() {
super();
mItems = new ArrayList<>();
AdapterData data = new AdapterData();
data.setTextOne("Many Bows");
mItems.add(data);
data = new AdapterData();
data.setTextOne("Pardon");
mItems.add(data);
data = new AdapterData();
data.setTextOne("Fall To Knees & Beg");
mItems.add(data);
data = new AdapterData();
data.setTextOne("Backflips");
mItems.add(data);
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.test3, viewGroup, false);
return new ViewHolder(v);
}
@Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
AdapterData …我正在使用a ArrayList并且所有字符串都在适配器中进行了硬编码,但现在我需要为我的应用程序提供多语言支持.我认为最好的方法是将我的所有硬编码字符串移动到我的strings.xml文件,然后生成我需要的所有不同语言的字符串文件.
我已经将硬编码的字符串移动到我的strings.xml但我现在不确定如何调用它们Arraylist而不是在那里使用硬编码字符串.
public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
List<AdapterData> mItems;
public Adapter() {
super();
mItems = new ArrayList<>();
AdapterData data = new AdapterData();
data.setQuestion("How Old Are You?");
data.setAnswer("I Am 21 Years Old");
mItems.add(data);
data = new AdapterData();
data.setQuestion("Where Were You Born?");
data.setAnswer("I Was Born In The USA");
mItems.add(data);
data = new AdapterData();
data.setQuestion("Are You Male or Female?");
data.setAnswer("I Am Male");
mItems.add(data);
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.recycler_view_card_item, viewGroup, …