这应该是一项简单的工作.我刚从api调用中获取数据,并希望在recyclerview中填充它.我做过这样的事情就像我猜的每个人一样.但是在这里,当视图项布局在适配器类中膨胀时,我得到空指针异常.我不知道如何解决它.
我的适配器类是
public class RecipeAdapter extends RecyclerView.Adapter<RecipeAdapter.ViewHolder> {
private List<RecipeByIngredients> recipeByIngredients;
private Context mContext;
public RecipeAdapter(List<RecipeByIngredients> recipeByIngredients, Context mContext) {
this.recipeByIngredients = recipeByIngredients;
this.mContext = mContext;
}
@Override
public RecipeAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
final LayoutInflater mInflater = LayoutInflater.from(parent.getContext());
final View itemView = mInflater.inflate(R.layout.recipe_item_layout, parent, false);
return new ViewHolder(itemView);
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
RecipeByIngredients recipeByIngredient = recipeByIngredients.get(position);
holder.tvUsedIngredients.setText(recipeByIngredient.getUsedIngredientCount() + " " + "ingredients used");
holder.tvMissedIngredients.setText(recipeByIngredient.getMissedIngredientCount() + " " + "missed ingredients");
Glide.with(mContext)
.load(recipeByIngredient.getImage())
.placeholder(R.drawable.recipe_placeholder) …java android nullpointerexception recycler-adapter android-recyclerview
我正在尝试实现RecyclerView,显示来自JSONArray的数据.解析工作完美,但RecyclerView在每个项目中显示必须仅在最后一项中的信息.屏幕截图清楚地表明了这一点.
这是我的代码:
MainActivity.java
public class MainActivity extends AppCompatActivity {
RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
protected void onCreate(Bundle savedInstanceState) {
setTheme(R.style.AppTheme);
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
new parseTask().execute();
}
private class parseTask extends AsyncTask<Void, Void, String> {
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
String resultJson = "";
ProgressDialog pdLoading = new ProgressDialog(MainActivity.this, R.style.MyDialogStyle);
@Override
protected void onPreExecute() {
super.onPreExecute();
pdLoading.setMessage("\tLoading...");
pdLoading.setCancelable(false);
pdLoading.show();
}
@Override
protected String doInBackground(Void... params) {
try {
URL url = new URL("http://songo.eu.pn/db_GetFromSongs.php");
urlConnection = …我有一个RecycleView地方，我对细胞有三种不同的看法。RView首次加载时，数据可以完美显示。当我开始滚动时，它会更改视图颜色。尝试了不同的方法，但无法解决。
原始观点。
错误的看法
public class TimelineRecyclerAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final int DATE_LAYOUT = 1;
private static final int EVEN_LAYOUT = 2;
private static final int ODD_LAYOUT = 3;
private List<TimeLineResponseDO.content> contents = new ArrayList<>();
Context context;
LayoutInflater layoutInflater;
private boolean isVisible = false;
private ConnectionDetector connectionDetector;
private ProgressDialog progressDialog;
private Fragment fragment1;
DateFormat inputFormat;
DateFormat outputFormat;
int counterOnCreate = 0;
int counterOnBind = 0;
public interface OpenSubmissionDetails{
void openSubmissionDetails(String submissionId);
}
public interface …android recycler-adapter android-recyclerview recyclerview-layout
我正在尝试添加ScrollView来保存标头和RecyclerView。
<ScrollView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<RelativeLayout
android:id="@+id/profile"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="100dp"
android:background="?attr/colorPrimary">
<ImageView
android:layout_width="100dp"
android:layout_height="100dp"
android:id="@+id/imageView"
android:adjustViewBounds="true"
android:cropToPadding="false" />
</RelativeLayout>
<ProgressBar
android:id="@+id/progressBar1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true" />
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_alignParentStart="true"
android:scrollbars="none"
android:layout_alignParentLeft="true" />
</RelativeLayout>
</ScrollView>
但是我有两个问题尝试这样做：
相对布局ID /配置文件正在消失。当我打开活动时，它会显示1秒钟，然后消失。
RecyclerView滚动太慢。
有任何想法吗？
android android-layout android-xml android-scrollview android-recyclerview
嘿家伙我有一个recyclerview适配器,它填充了cardview上的一些数据列表.我在卡片布局的右下角创建了一个三点菜单,它实际上会从recyclerview中删除卡片行,并且还会从存储行数据的sqlite数据库中删除该项目.问题是我无法弄清楚如何将实现删除的方法集成到recyclerview ViewHolder中.这是源代码
public class BeneficiaryRecyclerAdapter extends RecyclerView.Adapter<BeneficiaryRecyclerAdapter.BeneficiaryViewHolder> {
private List<Beneficiary> listBeneficiary;
public ImageView overflow;
private Context mContext;
public BeneficiaryRecyclerAdapter(){
}
public BeneficiaryRecyclerAdapter(List<Beneficiary> listBeneficiary, Context mContext) {
this.listBeneficiary = listBeneficiary;
this.mContext = mContext;
}
@Override
public BeneficiaryViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
// inflating recycler item view
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_beneficiary_recycler, parent, false);
return new BeneficiaryViewHolder(itemView);
}
@Override
public void onBindViewHolder(final BeneficiaryViewHolder holder, int position) {
holder.textViewName.setText(listBeneficiary.get(position).getName());
holder.textViewEmail.setText(listBeneficiary.get(position).getEmail());
holder.textViewAddress.setText(listBeneficiary.get(position).getAddress());
holder.textViewCountry.setText(listBeneficiary.get(position).getAddress());
holder.overflow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
showPopupMenu(holder.overflow); …在我的应用程序中,我使用包含许多项目的回收站视图,我想在项目之间显示一个无线分隔符(分隔线),但它不起作用.我已经尝试创建一个可绘制的形状,但是如果在dividerItemDecoration中添加drawable,则不会在回收器视图项之间显示空格或线.我也尝试过创建自定义的DividerItemDecoration类,但对我来说没什么用. 注意:目前在我的drawable形状设置为矩形我也试过线.如何实现.任何帮助将不胜感激.这是我的代码.
绘制对象:(customdrawableshape.xml)
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<stroke
android:width="3dp"
android:height="2dp"
android:color="#000000"
android:dashGap="10dp"
android:dashWidth="5dp" />
</shape>
回收站视图项的自定义行
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_marginBottom="2dp">
<TextView
android:id="@+id/tv_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
以及我将项目装饰设置为recyclerview的代码部分
DividerItemDecoration dividerItemDecoration;
recyclerview.setLayoutManager(linearlayoutmanager);
dividerItemDecoration = new DividerItemDecoration(recyclerview.getContext(),
linearlayoutmanager.getOrientation());
dividerItemDecoration.setDrawable(ContextCompat.getDrawable(context, R.drawable.customdrawableshape));
recyclerview.addItemDecoration(dividerItemDecoration);
设计布局RecycleView用于显示图像.下面添加了一个按钮RecycleView以保存列表中的所选项目.在设计视图中和运行应用程序时,按钮不可见.无法追踪问题所在.代码是:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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:orientation="vertical"
android:fitsSystemWindows="true"
tools:context="com.example.user.recycleview.imagesview">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="4dp"
android:theme="@style/AppTheme.AppBarLayout">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="@color/titlebar"
app:popupTheme="@style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<view
android:layout_width="fill_parent"
android:layout_height="fill_parent"
class="android.support.v7.widget.RecyclerView"
android:id="@+id/recycler_view" />
<Button
android:id="@+id/button7"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:background="@drawable/savebutton"
android:text="@string/save"
android:textColor="@color/white"
android:textSize="12pt" />
<!--
Deleted fab element
-->
</LinearLayout>
我想将文本视图数据从回收站视图带到另一个活动.我想将workshop_name TextView带到Otheractivity.
这是我的代码.
MechSearchActivity.java
public class MechSearchActivity extends AppCompatActivity {
List<SearchResponse.WorkshopDataBean> workshopList;
RecyclerView recyclerView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.search_mec);
recyclerView = (RecyclerView) findViewById(R.id.rv_workshoplist);
callSearchApi();
onItemClick();
}
public void callSearchApi() {
ApiInterface apiService = ApiClient.getClient().create(ApiInterface.class);
Call<SearchResponse> call = apiService.getSearchData( "workshop_name","image", "street", "locality", "city"); // single search for all the values
call.enqueue(new Callback<SearchResponse>() {
@Override
public void onResponse(Call<SearchResponse> call, retrofit2.Response<SearchResponse> response) {
SearchResponse searchResponse = response.body();
workshopList = searchResponse.getWorkshopData();
MechanicRecyclerAdapter adapter = new MechanicRecyclerAdapter(MechSearchActivity.this, workshopList);
recyclerView.setAdapter(adapter);
LinearLayoutManager mGridLayoutManager = …我有一个循环视图,当在recycleview上点击几秒钟时,运行一个快餐栏.怎么做？我很困惑寻找在谷歌搜索的关键字.我可以这样:
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
Glide.with(context)
.load("http://bls.hol.es/" + list_data.get(position).get("poto"))
.crossFade()
.placeholder(R.mipmap.ic_launcher)
.into(holder.imghape);
final String namamu=list_data.get(position).get("nama");
holder.txthape.setText(namamu);
holder.txtalamat.setText(list_data.get(position).get("alamat"));
// Set onclicklistener pada view tvTitle (TextView)
holder.txthape.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Clicked element "+namamu, Snackbar.LENGTH_LONG).show();
}
});
}
坦克..
所以我有一个片段内的recyclelerview,当内容加载到recyclerview时,它不占用屏幕的整个宽度.奇怪的是,我将这个代码用于另一个项目实际上是相同的并且没有问题.
片段布局是这样的
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/windowBackground"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
tools:context="com.dishesteam.dishes.activities.HomeActivity">
<android.support.design.widget.CoordinatorLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/coordinator">
<android.support.v4.widget.SwipeRefreshLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/swipeContainer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingTop="4dp"
android:paddingBottom="4dp"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
android:id="@+id/latest_recycler">
</android.support.v7.widget.RecyclerView>
</android.support.v4.widget.SwipeRefreshLayout>
<android.support.design.widget.FloatingActionButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/add_dish_fab"
app:srcCompat="@drawable/ic_add_black_24dp"
app:fabSize="normal"
app:backgroundTint="@color/colorAccent"
android:clickable="true"
android:layout_margin="16dp"
android:layout_gravity="bottom|end"
android:layout_alignParentBottom="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"/>
</android.support.design.widget.CoordinatorLayout>
<ImageView
android:id="@+id/trending_img"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:srcCompat="@drawable/ic_trending_up_black_24dp"
android:layout_centerInParent="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="20dp"
android:text="Nothing here at the moment"
android:textSize="16sp"
android:id="@+id/empty_text"
android:layout_below="@+id/trending_img"
android:layout_centerHorizontal="true"
android:textColor="@color/ColorDarkGrey" />
recyceler的各个项目的布局是
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/textColorPrimary"
app:cardCornerRadius="4dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp"
android:layout_marginTop="4dp"
android:layout_marginBottom="4dp">
<LinearLayout …xml android android-layout android-fragments android-recyclerview