populateViewHolder不能用FirebaseRecyclerAdapter执行（Android） [英] populateViewHolder not executing with FirebaseRecyclerAdapter (Android)
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问题描述
我正尝试使用FirebaseRecyclerAdapter 来使用Firebase数据库中的数据填充片段中的RecyclerView。
我的主要问题是 populateViewHolder 方法永远不会被调用，所以在 RecyclerView 。
我遵循 Firebase UI
https://github.com/firebase/FirebaseUI-Android/blob/master/database/README.md
规则在我的Firebase数据库上：
{
rules：{
.read： true，
.write：true
}
}
在我的 gradle 中，我添加了这个依赖项：
compile'com。 firebaseui：firebase-ui-database：0.4.1'
这是 onCreateView 方法在我的片段：
public查看onCreateView（LayoutInflater inflater， ViewGroup容器，
Bundled savedInstanceState）{
查看rootView = inflater.inflate（R.layout.fragment_dev_list，container，false）;
Log.d（ROOT_VIEW，rootView.toString（））;
mRecyclerView =（RecyclerView）rootView.findViewById（R.id.recycler_view）;
Log.d（RECYCLER_VIEW，mRecyclerView.toString（））;
mRecyclerView.setHasFixedSize（true）;
mRecyclerView.setLayoutManager（新的LinearLayoutManager（getActivity（）））;
Log.d（ITEM_RECYCLER，Integer.toString（mRecyclerView.getLayoutManager（）。getItemCount（）））;
DatabaseReference devs = FirebaseDatabase.getInstance（）。getReference（）。child（users）。child（devs）;
FirebaseRecyclerAdapter< Developer，DeveloperViewHolder>适配器=
新的FirebaseRecyclerAdapter< Developer，DeveloperViewHolder>（
Developer.class，
R.layout.dev_list_row，
DeveloperViewHolder.class，
devs
） {
@Override
protected void populateViewHolder（DeveloperViewHolder viewHolder，Developer developer，int position）{
Log.d（ON CREATE VIEW，before）;
viewHolder.setFirstName（developer.getFirstN（））;
viewHolder.setLastName（developer.getLastN（））;
viewHolder.setAddress（developer.getAddress（））;
Log.d（ON CREATE VIEW，populate）;
}
};
$ b Log.d（COUNT_ADAPTER，Integer.toString（adapter.getItemCount（）））;
Log.d（ADAPTER，adapter.toString（））;
Log.d（RECYCLER VIEW，mRecyclerView.toString（））;
mRecyclerView.setAdapter（adapter）;
Log.d（ON CREATE VIEW，end）;
return rootView;
以下是我的 DeveloperViewHolder 类：
public static class DeveloperViewHolder extends RecyclerView.ViewHolder {
TextView firstName;
TextView lastName;
TextView地址;
查看mView;
public DeveloperViewHolder（View v）{
super（v）;
this.mView = v;
$ b $ public void setFirstName（String firstN）{
this.firstName =（TextView）mView.findViewById（R.id.firstname_row）;
this.firstName.setText（firstN）;
$ b $ public void setLastName（String lastN）{
this.lastName =（TextView）mView.findViewById（R.id.lastname_row）;
this.lastName.setText（lastN）;
$ b $ public void setAddress（String addr）{
this.address =（TextView）mView.findViewById（R.id.address_row）;
this.address.setText（addr）;
$ b 开发者类模型类）：
public class Developer {
private String firstN;
私人字符串lastN;
私人字符串电子邮件;
私有字符串地址;
公共开发者（）{
}
公共开发者（字符串firstN，字符串lastN，字符串电子邮件，字符串地址）{
this.firstN = firstN;
this.lastN = lastN;
this.email = email;
this.address = address;
}
public String getFirstN（）{
return firstN;
}
public void setFirstN（String firstN）{
this.firstN = firstN;
}
public String getLastN（）{
return lastN;
public void setLastN（String lastN）{
this.lastN = lastN;
}
public String getEmail（）{
return email;
}
public void setEmail（String email）{
this.email = email;
}
public String getAddress（）{
return address;
$ b $ public void setAddress（String address）{
this.address = address;
$ b $ p $最后，一些日志：
$ $ p $ [07-08 09：42：42.773 18621：18668 D /]
HostConnection :: get ）建立新主机连接0x7f938cdb65c0，tid 18668
I / OpenGLRenderer：初始化EGL，版本1.4
D / OpenGLRenderer：启用调试模式0
I / TextInputLayout：添加的EditText不是TextInputEditText。请切换到使用该类。
I / TextInputLayout：添加的EditText不是TextInputEditText。请切换到使用该类。
我/ AppCompatViewInflater：应用程序：主题现已被弃用。请改为使用android：主题。
D / ACTION BAR？：android.support.v7.app.ToolbarActionBar@23efcd8a
D / ROOT_VIEW：android.widget.LinearLayout {27403c65 V.E ..... ...... I。 0,0-0,0}
D / RECYCLER_VIEW：android.support.v7.widget.RecyclerView {23dead3a VFED.V .. ...... I。 0,0-0,0＃7f0e00e5 app：id / recycler_view}
D / ITEM_RECYCLER：0
I / DynamiteModule：考虑到本地模块com.google.android.gms.firebase_database：2和远程模块com .google.android.gms.firebase_database：2
I / DynamiteModule：选定的远程版本com.google.android.gms.firebase_database，版本> = 2
D / COUNT_ADAPTER：0
D / ADAPTER：raphaelgrau.example.com.tabsapp.fragment.tabs.DevListFragment$1@29ec2dc7
D / RECYCLER VIEW：android.support.v7.widget.RecyclerView {23dead3a VFED.V .. ..... 。一世。 0,0-0,0＃7f0e00e5 app：id / recycler_view}
D / ON CREATE VIEW：end
E / DynamiteModule：无法加载模块描述符类：找不到类com.google .android.gms.dynamite.descriptors.com.google.firebase.auth.ModuleDescriptoron path：DexPathList [[zip file'/data/app/raphaelgrau.example.com.tabsapp-1/base.apk\"],nativeLibraryDirectories = [/ vendor / lib64，/ system / lib64]]
background_crash E / DynamiteModule：无法加载模块描述符类：未找到类com.google.android.gms.dynamite.descriptors.com.google .android.gms.crash.ModuleDescriptoron path：DexPathList [[zip file'/data/app/raphaelgrau.example.com.tabsapp-1/base.apk\"],nativeLibraryDirectories=[/vendor/lib64，/ system / lib64]]
background_crash W / ResourcesManager：资产路径/system/framework/com.android.media.remotedisplay.jar不存在或不包含任何资源。
background_crash W / ResourcesManager：资产路径/system/framework/com.android.location.provider.jar不存在或不包含任何资源。
background_crash W / ResourcesManager：资产路径/system/framework/com.android.media.remotedisplay.jar不存在或不包含任何资源。
background_crash W / ResourcesManager：资产路径/system/framework/com.android.location.provider.jar不存在或不包含任何资源。
background_crash D / ChimeraCfgMgr：读取存储的模块配置
background_crash I / DynamiteModule：考虑到本地模块com.google.android.gms.crash：0和远程模块com.google.android.gms.crash：2
background_crash I / DynamiteModule：所选的远程版本com.google.android.gms.crash，版本> = 2
background_crash D / ChimeraFileApk：请求进程的主ABI为x86_64
background_crash I / art：DexFile_isDexOptNeeded未能打开燕麦文件'/data/dalvik-cache/x86_64/data@data@com.google.android.gms@app_chimera@m@00000002@DynamiteModulesC_GmsCore_prodlmp_alldpi_release.apk@classes.dex'用于文件位置'/ data / data / com.google.android.gms / app_chimera / m / 00000002 / DynamiteModulesC_GmsCore_prodlmp_alldpi_release.apk'：打开oat文件名失败：没有这样的文件或目录
background_crash D / ChimeraFileApk：类加载成功。找到优化的代码。
background_crash I / FirebaseCrashReceiverServiceImpl：由ClassLoader创建的FirebaseCrashReceiverServiceImpl com.google.android.chimera.container.internal.DelegateLastPathClassLoader [DexPathList [[zip文件] /data/data/com.google.android.gms/app_chimera/m/ 00000002 / DynamiteModulesC_GmsCore_prodlmp_alldpi_release.apk]，nativeLibraryDirectories = [/ vendor / lib64，/ system / lib64]]]
background_crash D / FirebaseCrashReceiverServiceImpl：onCreate
background_crash I / DynamiteModule：考虑到本地模块com.google.android .gms.flags：0和远程模块com.google.android.gms.flags：1
background_crash I / DynamiteModule：所选远程版本的com.google.android.gms.flags，版本> = 1
background_crash I / FirebaseCrashSenderServiceImpl：由ClassLoader创建的FirebaseCrashSenderServiceImpl com.google.android.chimera.container.internal.DelegateLastPathClassLoader [DexPathList [[zip文件/data/data/com.google.android.gms/app_chimera/m/00000002/ DynamiteModulesC_GmsCore_prodlm
background_crash D / FirebaseCrashSenderServiceImpl：onCreate
解决方案
我解决了我的问题，感谢这个文档： ：//codelabs.developers.google.com/codelabs/firebase-android/#6rel =nofollow> https://codelabs.developers.google.com/codelabs/firebase-android/#6
我需要添加 RecyclerView.AdapterDataObserver（）：
pre $
mFirebaseAdapter.registerAdapterDataObserver（new RecyclerView.AdapterDataObserver（）{
@Override
public void onItemRangeInserted（int positionStart，int itemCount）{
super .onItemRangeInserted（positionStart，itemCount）;
int friendlyMessageCount = mFirebaseAdapter.getItemCount（）;
int lastVisiblePosition =
mLinearLayoutManager.findLastCompletelyVisibleItemPosition（）;
//如果回收者视图最初被加载，或者
//用户位于列表的底部，则滚动到列表的底部
//以显示新添加的消息。
if（lastVisiblePosition == -1 ||
（positionStart> =（friendlyMessageCount - 1）&&
lastVisiblePosition ==（positionStart - 1）））{
mMessageRecyclerView.scrollToPosition（positionStart）;
}
}
}）;
问题解决了！
I'm trying to use a FirebaseRecyclerAdapterto populate a RecyclerView in a fragment, with data from my Firebase database.
My main problem is that the populateViewHoldermethod is never called, so I got nothing displaying in the RecyclerView.
I followed the steps from the Firebase UIdocumentation :
https://github.com/firebase/FirebaseUI-Android/blob/master/database/README.md
The rules on my Firebase database :
{
"rules": {
".read": "true",
".write": "true"
}
}
In my gradle, I've added this dependency :
compile 'com.firebaseui:firebase-ui-database:0.4.1'
Here's the onCreateView method in my fragment :
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_dev_list, container, false);
Log.d("ROOT_VIEW", rootView.toString());
mRecyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
Log.d("RECYCLER_VIEW", mRecyclerView.toString());
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
Log.d("ITEM_RECYCLER", Integer.toString(mRecyclerView.getLayoutManager().getItemCount()));
DatabaseReference devs = FirebaseDatabase.getInstance().getReference().child("users").child("devs");
FirebaseRecyclerAdapter<Developer, DeveloperViewHolder> adapter =
new FirebaseRecyclerAdapter<Developer, DeveloperViewHolder>(
Developer.class,
R.layout.dev_list_row,
DeveloperViewHolder.class,
devs
) {
@Override
protected void populateViewHolder(DeveloperViewHolder viewHolder, Developer developer, int position) {
Log.d("ON CREATE VIEW", "before");
viewHolder.setFirstName(developer.getFirstN());
viewHolder.setLastName(developer.getLastN());
viewHolder.setAddress(developer.getAddress());
Log.d("ON CREATE VIEW", "populate");
}
};
Log.d("COUNT_ADAPTER", Integer.toString(adapter.getItemCount()));
Log.d("ADAPTER", adapter.toString());
Log.d("RECYCLER VIEW", mRecyclerView.toString());
mRecyclerView.setAdapter(adapter);
Log.d("ON CREATE VIEW", "end");
return rootView;
}
And here's my DeveloperViewHolder class :
public static class DeveloperViewHolder extends RecyclerView.ViewHolder {
TextView firstName;
TextView lastName;
TextView address;
View mView;
public DeveloperViewHolder(View v) {
super(v);
this.mView = v;
}
public void setFirstName(String firstN) {
this.firstName = (TextView) mView.findViewById(R.id.firstname_row);
this.firstName.setText(firstN);
}
public void setLastName(String lastN) {
this.lastName = (TextView) mView.findViewById(R.id.lastname_row);
this.lastName.setText(lastN);
}
public void setAddress(String addr) {
this.address = (TextView) mView.findViewById(R.id.address_row);
this.address.setText(addr);
}
}
The Developer class (model class) :
public class Developer {
private String firstN;
private String lastN;
private String email;
private String address;
public Developer() {
}
public Developer(String firstN, String lastN, String email, String address) {
this.firstN = firstN;
this.lastN = lastN;
this.email = email;
this.address = address;
}
public String getFirstN() {
return firstN;
}
public void setFirstN(String firstN) {
this.firstN = firstN;
}
public String getLastN() {
return lastN;
}
public void setLastN(String lastN) {
this.lastN = lastN;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
}
And finally, some logs :
[ 07-08 09:42:42.773 18621:18668 D/ ]
HostConnection::get() New Host Connection established 0x7f938cdb65c0, tid 18668
I/OpenGLRenderer: Initialized EGL, version 1.4
D/OpenGLRenderer: Enabling debug mode 0
I/TextInputLayout: EditText added is not a TextInputEditText. Please switch to using that class instead.
I/TextInputLayout: EditText added is not a TextInputEditText. Please switch to using that class instead.
I/AppCompatViewInflater: app:theme is now deprecated. Please move to using android:theme instead.
D/ACTION BAR?: android.support.v7.app.ToolbarActionBar@23efcd8a
D/ROOT_VIEW: android.widget.LinearLayout{27403c65 V.E..... ......I. 0,0-0,0}
D/RECYCLER_VIEW: android.support.v7.widget.RecyclerView{23dead3a VFED.V.. ......I. 0,0-0,0 #7f0e00e5 app:id/recycler_view}
D/ITEM_RECYCLER: 0
I/DynamiteModule: Considering local module com.google.android.gms.firebase_database:2 and remote module com.google.android.gms.firebase_database:2
I/DynamiteModule: Selected remote version of com.google.android.gms.firebase_database, version >= 2
D/COUNT_ADAPTER: 0
D/ADAPTER: raphaelgrau.example.com.tabsapp.fragment.tabs.DevListFragment$1@29ec2dc7
D/RECYCLER VIEW: android.support.v7.widget.RecyclerView{23dead3a VFED.V.. ......I. 0,0-0,0 #7f0e00e5 app:id/recycler_view}
D/ON CREATE VIEW: end
E/DynamiteModule: Failed to load module descriptor class: Didn't find class "com.google.android.gms.dynamite.descriptors.com.google.firebase.auth.ModuleDescriptor" on path: DexPathList[[zip file "/data/app/raphaelgrau.example.com.tabsapp-1/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]
background_crash E/DynamiteModule: Failed to load module descriptor class: Didn't find class "com.google.android.gms.dynamite.descriptors.com.google.android.gms.crash.ModuleDescriptor" on path: DexPathList[[zip file "/data/app/raphaelgrau.example.com.tabsapp-1/base.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]
background_crash W/ResourcesManager: Asset path '/system/framework/com.android.media.remotedisplay.jar' does not exist or contains no resources.
background_crash W/ResourcesManager: Asset path '/system/framework/com.android.location.provider.jar' does not exist or contains no resources.
background_crash W/ResourcesManager: Asset path '/system/framework/com.android.media.remotedisplay.jar' does not exist or contains no resources.
background_crash W/ResourcesManager: Asset path '/system/framework/com.android.location.provider.jar' does not exist or contains no resources.
background_crash D/ChimeraCfgMgr: Reading stored module config
background_crash I/DynamiteModule: Considering local module com.google.android.gms.crash:0 and remote module com.google.android.gms.crash:2
background_crash I/DynamiteModule: Selected remote version of com.google.android.gms.crash, version >= 2
background_crash D/ChimeraFileApk: Primary ABI of requesting process is x86_64
background_crash I/art: DexFile_isDexOptNeeded failed to open oat file '/data/dalvik-cache/x86_64/data@data@com.google.android.gms@app_chimera@m@00000002@DynamiteModulesC_GmsCore_prodlmp_alldpi_release.apk@classes.dex' for file location '/data/data/com.google.android.gms/app_chimera/m/00000002/DynamiteModulesC_GmsCore_prodlmp_alldpi_release.apk': Failed to open oat filename for reading: No such file or directory
background_crash D/ChimeraFileApk: Classloading successful. Optimized code found.
background_crash I/FirebaseCrashReceiverServiceImpl: FirebaseCrashReceiverServiceImpl created by ClassLoader com.google.android.chimera.container.internal.DelegateLastPathClassLoader[DexPathList[[zip file "/data/data/com.google.android.gms/app_chimera/m/00000002/DynamiteModulesC_GmsCore_prodlmp_alldpi_release.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]]
background_crash D/FirebaseCrashReceiverServiceImpl: onCreate
background_crash I/DynamiteModule: Considering local module com.google.android.gms.flags:0 and remote module com.google.android.gms.flags:1
background_crash I/DynamiteModule: Selected remote version of com.google.android.gms.flags, version >= 1
background_crash I/FirebaseCrashSenderServiceImpl: FirebaseCrashSenderServiceImpl created by ClassLoader com.google.android.chimera.container.internal.DelegateLastPathClassLoader[DexPathList[[zip file "/data/data/com.google.android.gms/app_chimera/m/00000002/DynamiteModulesC_GmsCore_prodlmp_alldpi_release.apk"],nativeLibraryDirectories=[/vendor/lib64, /system/lib64]]]
background_crash D/FirebaseCrashSenderServiceImpl: onCreate
解决方案
I fixed my problem thanks to this doc :
https://codelabs.developers.google.com/codelabs/firebase-android/#6
I needed to add a RecyclerView.AdapterDataObserver() :
mFirebaseAdapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
@Override
public void onItemRangeInserted(int positionStart, int itemCount) {
super.onItemRangeInserted(positionStart, itemCount);
int friendlyMessageCount = mFirebaseAdapter.getItemCount();
int lastVisiblePosition =
mLinearLayoutManager.findLastCompletelyVisibleItemPosition();
// If the recycler view is initially being loaded or the
// user is at the bottom of the list, scroll to the bottom
// of the list to show the newly added message.
if (lastVisiblePosition == -1 ||
(positionStart >= (friendlyMessageCount - 1) &&
lastVisiblePosition == (positionStart - 1))) {
mMessageRecyclerView.scrollToPosition(positionStart);
}
}
});
Problem solved!
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