Android - 如何过滤Firebase的RecyclerView？ [英] Android - How to filter the RecyclerView of Firebase?
本文介绍了Android - 如何过滤Firebase的RecyclerView？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我最近在我的Android Firebase应用中添加了一个searchBar，但是我实际上找不到如何在我的应用中过滤数据。我需要在title，desc和username子目录中进行搜索，如
photo。
我该怎么办？感谢
[随机字母hsiukhdufhjwrepjèijgitrjwbnrtnbnbeènbèrnbgnèjwtigogjwitjgbniownttngfnwnpnwpjgnjntwjtngjnjwngjggpnwrjgrngjwpnjnvwpjeenjrvnjpreqngjnpwjgnrjpwnjpn2ngj2nrjnp2r2g2hhuheqdhyg1eydgugf]
的更新的代码MainActivity：
public class MainActivity extends AppCompatActivity {
private RecyclerView mBlogList;
private DatabaseReference mDatabase;
private DatabaseReference mDatabaseUsers;
private DatabaseReference mDatabaseLike;
私人查询mQuery;
私有SearchView mSearchView;
private FirebaseAuth mAuth;
私有FirebaseAuth.AuthStateListener mAuthListener;
private boolean mProcessLike = false;
私人TextView徽章;
protected void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.activity_main）;
mAuth = FirebaseAuth.getInstance（）;
mAuthListener = new FirebaseAuth.AuthStateListener（）{
@Override $ b $ public void onAuthStateChanged（@NonNull FirebaseAuth firebaseAuth）{
if（firebaseAuth.getCurrentUser（）== null）{
意图loginIntent = new Intent（MainActivity.this，LoginActivity.class）;
loginIntent.addFlags（Intent.FLAG_ACTIVITY_CLEAR_TOP）;
startActivity（loginIntent）;
}
}
};
mDatabase = FirebaseDatabase.getInstance（）。getReference（）。child（Blog）;
mDatabaseUsers = FirebaseDatabase.getInstance（）。getReference（）。child（Users）;
mDatabaseLike = FirebaseDatabase.getInstance（）。getReference（）。child（Likes）;
mDatabaseUsers.keepSynced（true）;
mDatabaseLike.keepSynced（true）;
mDatabase.keepSynced（true）;
mBlogList =（RecyclerView）findViewById（R.id.blog_list）;
LinearLayoutManager layoutManager = new LinearLayoutManager（this）;
layoutManager.setReverseLayout（true）;
layoutManager.setStackFromEnd（true）;
mBlogList.setHasFixedSize（true）;
mBlogList.setLayoutManager（新的LinearLayoutManager（this））;
badge =（TextView）findViewById（R.id.badge）;
$ b @Override
protected void onStart（）{
super.onStart（）;
mAuth.addAuthStateListener（mAuthListener）;
最终FirebaseRecyclerAdapter< Blog，BlogViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter< Blog，BlogViewHolder>（
Blog.class，
R.layout.blog_row，
BlogViewHolder.class，
mQuery
） {
@Override
protected void populateViewHolder（final BlogViewHolder viewHolder，Blog model，int position）{
final String post_key = getRef（position）.getKey（）;
viewHolder.setTitle（model.getTitle（））;
viewHolder.setDesc（model.getDesc（））;
viewHolder.setImage（getApplicationContext（），model.getImage（））;
viewHolder.setUsername（model.getUsername（））;
viewHolder.setLikeBtn（post_key）;
viewHolder.mView.setOnClickListener（new View.OnClickListener（）{
@Override
public void onClick（View view）{
Intent singleBlogIntent = new Intent（MainActivity.this，BlogSingleActivity.class）;
singleBlogIntent.putExtra（blog_id，post_key）;
startActivity（singleBlogIntent）;
}
} ）;
mDatabaseUsers.child（model.getUid（））。child（image）。addValueEventListener（new ValueEventListener（）{
@Override
public void onDataChange（DataSnapshot dataSnapshot） {
String imageUrl = dataSnapshot.getValue（）。toString（）;
viewHolder.setUserimage（getApplicationContext（），imageUrl）;
}
@Override
public void onCancelled（DatabaseError databaseError）{
$ b}
}）;
$ b viewHolder.mLikeBtn.setOnClickListener（new View.OnClickListener（）{
@Override
public void onClick（View view）{
$ db
$ b $ db
bDatabaseLike.addValueEventListener（new ValueEventListener如果（dataSnapshot.child（post_key）.hasChild（mAuth.getCurrentUser（）。getUid（）））{
mDatabaseLike.child（post_key）.child （）; getUid（））。removeValue（）;
mProcessLike = false;
} else {
mDatabaseLike.child （post_key）.child（mAuth.getCurrentUser（）的getuid（））。SE tValue（ 随机值）;
mProcessLike = false;
@Override
public void onCancelled（DatabaseError databaseError）{
}
}）;
}
}）;
}
};
mBlogList.setAdapter（firebaseRecyclerAdapter）;
private void checkUserExist（）{
final String user_id = this.mAuth.getCurrentUser（）。getUid（）;
this.mDatabaseUsers.addValueEventListener（new ValueEventListener（）{
public void onDataChange（DataSnapshot dataSnapshot）{
if（！dataSnapshot.hasChild（user_id））{
Intent setupIntent = new Intent（MainActivity.this，SetupActivity.class）;
setupIntent.addFlags（Intent.FLAG_ACTIVITY_CLEAR_TOP）;
startActivity（setupIntent）;
MainActivity.this.startActivity（setupIntent）;
}
$ b $ if（user_id == null）{Intent errorIntent = new Intent（MainActivity.this，ErrorActivity.class）;
errorIntent.addFlags（Intent.FLAG_ACTIVITY_CLEAR_TOP）;
startActivity （errorIntent）;
MainActivity.this.startActivity（errorIntent）;
}}
public void onCancelled（DatabaseError databaseError）{
}
}） ;
$ b $ public static class BlogViewHolder extends RecyclerView.ViewHolder {
View mView;
ImageButton mLikeBtn;
DatabaseReference mDatabaseLike;
FirebaseAuth mAuth;
public BlogViewHolder（View itemView）{
super（itemView）;
mView = itemView;
mLikeBtn =（ImageButton）mView.findViewById（R.id.like_btn）;
mDatabaseLike = FirebaseDatabase.getInstance（）。getReference（）。child（Likes）;
mAuth = FirebaseAuth.getInstance（）;
mDatabaseLike.keepSynced（true）;
$ b public void setUserimage（Context context，String imageUrl）{
ImageView imageViewPostUserImage =（ImageView） mView.findViewById（R.id.imageview_post_userimage）;
Glide
.with（context）
.load（imageUrl）
.into（imageViewPostUserImage）;
public void setLikeBtn（final String post_key）{
mDatabaseLike.addValueEventListener（new ValueEventListener（）{
@Override
public void onDataChange（DataSnapshot dataSnapshot）{
$ b $ if（dataSnapshot.child（post_key）.hasChild（mAuth.getCurrentUser（）。getUid（）））{
mLikeBtn.setImageResource R.mipmap.ic_thumb_up_black_24dp）;
} else {
mLikeBtn.setImageResource（R.mipmap.ic_thumb_up_white_24dp）;
}
}
@Override
public void onCancelled（DatabaseError databaseError）{
$ b}
}）;
$ b public void setTitle（String title）{
TextView post_title =（TextView）mView.findViewById （R.id.post_title）;
post_title.setText（title）;
}
public void setDesc（String desc）{
TextView post_desc =（TextView）mView.findViewById（R.id.post_desc）;
post_desc.setText（desc）;
$ b public void setUsername（String username）{
TextView post_username =（TextView）mView.findViewById（R.id.post_username）;
post_username.setText（username）;
$ b public void setImage（Context ctx，String image）{
ImageView post_image =（ImageView）mView.findViewById（R.id。 post_image）;
Picasso.with（ctx）.load（image）.into（post_image）;
$ b覆盖
public boolean onCreateOptionsMenu（菜单菜单）{
getMenuInflater（）。inflate（R.menu.main_menu，menu）;
SearchView searchView =（SearchView）MenuItemCompat.getActionView（menu.findItem（R.id.action_search））;
searchView.setOnQueryTextListener（new SearchView.OnQueryTextListener（）{
@Override
public boolean onQueryTextSubmit（String query）{
意图searchIntent = new Intent （MainActivity.this，searchActivity.class）;
searchIntent.putExtra（search，query）;
startActivity（searchIntent）;
return false;
}
@Override
public boolean onQueryTextChange（String newText）{
// ??????
return true;
}
}）;
return super.onCreateOptionsMenu（menu）;
$覆盖
public boolean onOptionsItemSelected（MenuItem item）{
$ b $ （item.getItemId（）== R.id.action_add）{
startActivity（new Intent（MainActivity.this，PostActivity.class））;
$ b if（item.getItemId（）== R.id.action_logout）{
logout（）;
}
return super.onOptionsItemSelected（item）;
private void logout（）{
mAuth.signOut（）;
$ b $ / code $ / pre
$ b $ p
searchActivity
public class searchActivity extends AppCompatActivity {
private RecyclerView mBlogList;
private DatabaseReference mDatabase;
private DatabaseReference mDatabaseUsers;
private DatabaseReference mDatabaseLike;
私人查询mQuery;
私人查询mQuerySearch;
私有SearchView mSearchView;
private FirebaseAuth mAuth;
私有FirebaseAuth.AuthStateListener mAuthListener;
private boolean mProcessLike = false;
私人TextView徽章;
私有字符串搜索;
protected void onCreate（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）;
setContentView（R.layout.activity_main）;
mAuth = FirebaseAuth.getInstance（）;
mAuthListener = new FirebaseAuth.AuthStateListener（）{
@Override $ b $ public void onAuthStateChanged（@NonNull FirebaseAuth firebaseAuth）{
if（firebaseAuth.getCurrentUser（）== null）{
意图loginIntent = new Intent（com.fgvelectro.f.searchActivity.this，LoginActivity.class）;
loginIntent.addFlags（Intent.FLAG_ACTIVITY_CLEAR_TOP）;
startActivity（loginIntent）;
}
}
};
mDatabase = FirebaseDatabase.getInstance（）。getReference（）。child（Blog）;
search = getIntent（）。getExtras（）。getString（search）;
mQuerySearch = mDatabase.orderByChild（title）。equalTo（search）;
mAuth.addAuthStateListener（mAuthListener）;
mDatabaseUsers = FirebaseDatabase.getInstance（）。getReference（）。child（Users）;
mDatabaseLike = FirebaseDatabase.getInstance（）。getReference（）。child（Likes）;
mDatabaseUsers.keepSynced（true）;
mDatabaseLike.keepSynced（true）;
mDatabase.keepSynced（true）;
mQuery = mDatabase.orderByChild（title）。equalTo（try1）;
mBlogList =（RecyclerView）findViewById（R.id.blog_list）;
LinearLayoutManager layoutManager = new LinearLayoutManager（this）;
layoutManager.setReverseLayout（true）;
layoutManager.setStackFromEnd（true）;
mBlogList.setHasFixedSize（true）;
mBlogList.setLayoutManager（新的LinearLayoutManager（this））;
badge =（TextView）findViewById（R.id.badge）;
$ b @Override
protected void onStart（）{
super.onStart（）;
FirebaseRecyclerAdapter< Blog，searchActivity.BlogViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter< Blog，BlogViewHolder>（
Blog.class，
.layout.blog_row，
searchActivity.BlogViewHolder.class，
mQuerySearch
）{
@Override
protected void populateViewHolder（BlogViewHolder viewHolder，Blog model，int position）{
}
protected void populateViewHolder（final com.fgvelectro.f.MainActivity.BlogViewHolder viewHolder，Blog model，int position）{
final String post_key = getRef（position）.getKey（）;
viewHolder.setTitle（model.getTitle（））;
viewHolder.setDesc（model.getDesc（））;
viewHolder.setImage（getApplicationContext（），model.getImage（））;
viewHolder.setUsername（model.getUsername（））;
viewHolder.setLikeBtn（post_key）;
viewHolder.mView.setOnClickListener（new View.OnClickListener（）{
@Override
public void onClick（View view）{
Intent singleBlogIntent =新的意图（com.fgvelectro.f.searchActivity.this，BlogSingleActivity.class）;
singleBlogIntent.putExtra（blog_id，post_key）;
startActivity（singleBlogIntent）;
}
}）;
mDatabaseUsers.child（model.getUid（））。child（image）。addValueEventListener（new ValueEventListener（）{
@Override
public void onDataChange（DataSnapshot dataSnapshot） {
String imageUrl = dataSnapshot.getValue（）。toString（）;
viewHolder.setUserimage（getApplicationContext（），imageUrl）;
}
@Override
public void onCancelled（DatabaseError databaseError）{
$ b}
}）;
$ b viewHolder.mLikeBtn.setOnClickListener（new View.OnClickListener（）{
@Override
public void onClick（View view）{
$ db
$ b $ db
bDatabaseLike.addValueEventListener（new ValueEventListener如果（dataSnapshot.child（post_key）.hasChild（mAuth.getCurrentUser（）。getUid（）））{
mDatabaseLike.child（post_key）.child （）; getUid（））。removeValue（）;
mProcessLike = false;
} else {
mDatabaseLike.child （post_key）.child（mAuth.getCurrentUser（）的getuid（））。SE tValue（ 随机值）;
mProcessLike = false;
@Override
public void onCancelled（DatabaseError databaseError）{
}
}）;
}
}）;
}
};
mBlogList.setAdapter（firebaseRecyclerAdapter）;
private void checkUserExist（）{
final String user_id = this.mAuth.getCurrentUser（）。getUid（）;
this.mDatabaseUsers.addValueEventListener（new ValueEventListener（）{
public void onDataChange（DataSnapshot dataSnapshot）{
if（！dataSnapshot.hasChild（user_id））{
Intent setupIntent = new Intent（com.fgvelectro.f.searchActivity.this，SetupActivity.class）;
setupIntent.addFlags（Intent.FLAG_ACTIVITY_CLEAR_TOP）;
startActivity（setupIntent）;
com.fgvelectro.f.searchActivity .this.startActivity（setupIntent）;
}
if（user_id == null）{Intent errorIntent = new Intent（com.fgvelectro.f.searchActivity.this，ErrorActivity.class）;
errorIntent.addFlags（Intent.FLAG_ACTIVITY_CLEAR_TOP）;
startActivity（errorIntent）;
com.fgvelectro.f.searchActivity.this.startActivity（errorIntent）;
}}
public void onCancelled（DatabaseError databaseError）{
}
}）;
$ b $ public static class BlogViewHolder extends RecyclerView.ViewHolder {
View mView;
ImageButton mLikeBtn;
DatabaseReference mDatabaseLike;
FirebaseAuth mAuth;
public BlogViewHolder（View itemView）{
super（itemView）;
mView = itemView;
mLikeBtn =（ImageButton）mView.findViewById（R.id.like_btn）;
mDatabaseLike = FirebaseDatabase.getInstance（）。getReference（）。child（Likes）;
mAuth = FirebaseAuth.getInstance（）;
mDatabaseLike.keepSynced（true）;
$ b public void setUserimage（Context context，String imageUrl）{
ImageView imageViewPostUserImage =（ImageView） mView.findViewById（R.id.imageview_post_userimage）;
Glide
.with（context）
.load（imageUrl）
.into（imageViewPostUserImage）;
public void setLikeBtn（final String post_key）{
mDatabaseLike.addValueEventListener（new ValueEventListener（）{
@Override
public void onDataChange（DataSnapshot dataSnapshot）{
$ b $ if（dataSnapshot.child（post_key）.hasChild（mAuth.getCurrentUser（）。getUid（）））{
mLikeBtn.setImageResource R.mipmap.ic_thumb_up_black_24dp）;
} else {
mLikeBtn.setImageResource（R.mipmap.ic_thumb_up_white_24dp）;
}
}
@Override
public void onCancelled（DatabaseError databaseError）{
$ b}
}）;
$ b public void setTitle（String title）{
TextView post_title =（TextView）mView.findViewById （R.id.post_title）;
post_title.setText（title）;
}
public void setDesc（String desc）{
TextView post_desc =（TextView）mView.findViewById（R.id.post_desc）;
post_desc.setText（desc）;
$ b public void setUsername（String username）{
TextView post_username =（TextView）mView.findViewById（R.id.post_username）;
post_username.setText（username）;
$ b public void setImage（Context ctx，String image）{
ImageView post_image =（ImageView）mView.findViewById（R.id。 post_image）;
Picasso.with（ctx）.load（image）.into（post_image）;
$ b覆盖
public boolean onCreateOptionsMenu（菜单菜单）{
getMenuInflater（）。inflate（R.menu.main_menu，menu）;
SearchView searchView =（SearchView）MenuItemCompat.getActionView（menu.findItem（R.id.action_search））;
searchView.setOnQueryTextListener（new SearchView.OnQueryTextListener（）{
@Override
public boolean onQueryTextSubmit（String query）{
意图searchIntent = new Intent （com.fgvelectro.f.searchActivity.this，searchActivity.class）;
searchIntent.putExtra（search，query）;
startActivity（searchIntent）;
return false;
}
@Override
public boolean onQueryTextChange（String newText）{
// ??????
return true;
}
}）;
return super.onCreateOptionsMenu（menu）;
$覆盖
public boolean onOptionsItemSelected（MenuItem item）{
$ b $如果（item.getItemId（）== R.id.action_add）{
startActivity（new Intent（com.fgvelectro.f.searchActivity.this，PostActivity.class））;
$ b if（item.getItemId（）== R.id.action_logout）{
logout（）;
}
return super.onOptionsItemSelected（item）;
private void logout（）{
mAuth.signOut（）;
$ b $ / code $ / pre
$ b $ p
图片出错 解决方案首先，你需要查询你的数据库，例如
mQuery = mDatabase.orderByChild（Title）。equalTo（您的值）然后转到您的firebaseRecyclerAdapter并替换：
FirebaseRecyclerAdapter< Blog，BlogViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter< Blog，BlogViewHolder>（
Blog.class，
R.layout.blog_row，
BlogViewHolder.class，
mDatabase
）
：
final FirebaseRecyclerAdapter< Blog，BlogViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter< Blog，BlogViewHolder>（
Blog.class，
R.layout.blog_row，
BlogViewHolder.class，
mQuery
）
要了解更多信息，请点击此处查看文档： https://firebase.google.com/docs/reference/android/com/google/firebase/数据库/查询
和FirebaseUI文档： https://github.com/firebase/FirebaseUI-Android
这就是我所做的：
$ （菜单菜单）{
getMenuInflater（）。inflate（R.menu.main_menu，menu ）;
SearchView searchView =（SearchView）MenuItemCompat.getActionView（menu.findItem（R.id.action_search））;
searchView.setOnQueryTextListener（new SearchView.OnQueryTextListener（）{
@Override
public boolean onQueryTextSubmit（String query）{
意图searchIntent = new Intent （MainActivity.this，searchActivity.class）;
searchIntent.putExtra（search，query）;
startActivity（searchIntent）;
return false;
}
@Override
public boolean onQueryTextChange（String newText）{
// ??????
return true;
}
}）;
return super.onCreateOptionsMenu（menu）;
}
activity：
String search = getIntent（）。getExtras（）。getString（search）;
mQuerySearch = mDatabase.orderByChild（name）。equalTo（search）;
FirebaseRecyclerAdapter< Classified，searchActivity.ClassifiedViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter< Classified，searchActivity.ClassifiedViewHolder>（
Classified.class，
R.layout.classified_row，
searchActivity.ClassifiedViewHolder.class，
mQuerySearch
）
I've recently added a searchBar to my Android Firebase app, but I really can't find how to filter data in my app. I need to search in "title", "desc" and "username" childs, as seen in the
photo.
What should I do? Thanks
[Random letters hsiukhdufhjwrepjèijgitrjwbnrtnbnbeènbèrnbgnèjwtigogjwitjgbniownttngfnwnpnwpjgnjntwjtngjnjwngjggpnwrjgrngjwpnjnvwpjeenjrvnjpreqngjnpwjgnrjpwnjpn2ngj2nrjnp2r2g2hhuheqdhyg1eydgugf]
updated code of MainActivity:
public class MainActivity extends AppCompatActivity{
private RecyclerView mBlogList;
private DatabaseReference mDatabase;
private DatabaseReference mDatabaseUsers;
private DatabaseReference mDatabaseLike;
private Query mQuery;
private SearchView mSearchView;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private boolean mProcessLike = false;
private TextView badge;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAuth = FirebaseAuth.getInstance();
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
if(firebaseAuth.getCurrentUser() == null){
Intent loginIntent = new Intent(MainActivity.this, LoginActivity.class);
loginIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(loginIntent);
}
}
};
mDatabase = FirebaseDatabase.getInstance().getReference().child("Blog");
mDatabaseUsers = FirebaseDatabase.getInstance().getReference().child("Users");
mDatabaseLike = FirebaseDatabase.getInstance().getReference().child("Likes");
mDatabaseUsers.keepSynced(true);
mDatabaseLike.keepSynced(true);
mDatabase.keepSynced(true);
mBlogList = (RecyclerView) findViewById(R.id.blog_list);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setReverseLayout(true);
layoutManager.setStackFromEnd(true);
mBlogList.setHasFixedSize(true);
mBlogList.setLayoutManager(new LinearLayoutManager(this));
badge = (TextView)findViewById ( R.id.badge );
}
@Override
protected void onStart() {
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
final FirebaseRecyclerAdapter<Blog, BlogViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Blog, BlogViewHolder>(
Blog.class,
R.layout.blog_row,
BlogViewHolder.class,
mQuery
) {
@Override
protected void populateViewHolder(final BlogViewHolder viewHolder, Blog model, int position) {
final String post_key = getRef(position).getKey();
viewHolder.setTitle(model.getTitle());
viewHolder.setDesc(model.getDesc());
viewHolder.setImage(getApplicationContext(), model.getImage());
viewHolder.setUsername(model.getUsername());
viewHolder.setLikeBtn(post_key);
viewHolder.mView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent singleBlogIntent = new Intent(MainActivity.this, BlogSingleActivity.class);
singleBlogIntent.putExtra("blog_id", post_key);
startActivity(singleBlogIntent);
}
});
mDatabaseUsers.child(model.getUid()).child("image").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
String imageUrl = dataSnapshot.getValue().toString();
viewHolder.setUserimage(getApplicationContext(), imageUrl);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
viewHolder.mLikeBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mProcessLike = true;
mDatabaseLike.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (mProcessLike) {
if (dataSnapshot.child(post_key).hasChild(mAuth.getCurrentUser().getUid())) {
mDatabaseLike.child(post_key).child(mAuth.getCurrentUser().getUid()).removeValue();
mProcessLike = false;
} else {
mDatabaseLike.child(post_key).child(mAuth.getCurrentUser().getUid()).setValue("RandomValue");
mProcessLike = false;
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
});
}
};
mBlogList.setAdapter(firebaseRecyclerAdapter);
}
private void checkUserExist() {
final String user_id = this.mAuth.getCurrentUser().getUid();
this.mDatabaseUsers.addValueEventListener(new ValueEventListener() {
public void onDataChange(DataSnapshot dataSnapshot) {
if (!dataSnapshot.hasChild(user_id)) {
Intent setupIntent = new Intent(MainActivity.this, SetupActivity.class);
setupIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(setupIntent);
MainActivity.this.startActivity(setupIntent);
}
if (user_id == null){Intent errorIntent = new Intent (MainActivity.this, ErrorActivity.class);
errorIntent.addFlags ( Intent.FLAG_ACTIVITY_CLEAR_TOP );
startActivity(errorIntent);
MainActivity.this.startActivity (errorIntent);
}}
public void onCancelled(DatabaseError databaseError) {
}
});
}
public static class BlogViewHolder extends RecyclerView.ViewHolder{
View mView;
ImageButton mLikeBtn;
DatabaseReference mDatabaseLike;
FirebaseAuth mAuth;
public BlogViewHolder(View itemView) {
super(itemView);
mView = itemView;
mLikeBtn = (ImageButton) mView.findViewById(R.id.like_btn);
mDatabaseLike = FirebaseDatabase.getInstance().getReference().child("Likes");
mAuth = FirebaseAuth.getInstance();
mDatabaseLike.keepSynced(true);
}
public void setUserimage(Context context, String imageUrl) {
ImageView imageViewPostUserImage = (ImageView) mView.findViewById(R.id.imageview_post_userimage);
Glide
.with(context)
.load(imageUrl)
.into(imageViewPostUserImage);
}
public void setLikeBtn(final String post_key) {
mDatabaseLike.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.child(post_key).hasChild(mAuth.getCurrentUser().getUid())) {
mLikeBtn.setImageResource(R.mipmap.ic_thumb_up_black_24dp);
} else {
mLikeBtn.setImageResource(R.mipmap.ic_thumb_up_white_24dp);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void setTitle(String title){
TextView post_title = (TextView) mView.findViewById(R.id.post_title);
post_title.setText(title);
}
public void setDesc(String desc){
TextView post_desc = (TextView) mView.findViewById(R.id.post_desc);
post_desc.setText(desc);
}
public void setUsername(String username){
TextView post_username = (TextView) mView.findViewById(R.id.post_username);
post_username.setText(username);
}
public void setImage(Context ctx, String image){
ImageView post_image = (ImageView) mView.findViewById(R.id.post_image);
Picasso.with(ctx).load(image).into(post_image);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(menu.findItem(R.id.action_search));
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
Intent searchIntent = new Intent(MainActivity.this, searchActivity.class);
searchIntent.putExtra("search", query);
startActivity(searchIntent);
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
//??????
return true;
}
});
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == R.id.action_add){
startActivity(new Intent(MainActivity.this, PostActivity.class));
}
if (item.getItemId() == R.id.action_logout){
logout();
}
return super.onOptionsItemSelected(item);
}
private void logout() {
mAuth.signOut();
}
}
searchActivity
public class searchActivity extends AppCompatActivity{
private RecyclerView mBlogList;
private DatabaseReference mDatabase;
private DatabaseReference mDatabaseUsers;
private DatabaseReference mDatabaseLike;
private Query mQuery;
private Query mQuerySearch;
private SearchView mSearchView;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private boolean mProcessLike = false;
private TextView badge;
private String search;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAuth = FirebaseAuth.getInstance();
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
if(firebaseAuth.getCurrentUser() == null){
Intent loginIntent = new Intent( com.fgvelectro.f.searchActivity.this, LoginActivity.class);
loginIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(loginIntent);
}
}
};
mDatabase = FirebaseDatabase.getInstance().getReference().child("Blog");
search = getIntent().getExtras().getString("search");
mQuerySearch = mDatabase.orderByChild("title").equalTo(search);
mAuth.addAuthStateListener(mAuthListener);
mDatabaseUsers = FirebaseDatabase.getInstance().getReference().child("Users");
mDatabaseLike = FirebaseDatabase.getInstance().getReference().child("Likes");
mDatabaseUsers.keepSynced(true);
mDatabaseLike.keepSynced(true);
mDatabase.keepSynced(true);
mQuery = mDatabase.orderByChild("title").equalTo("try1");
mBlogList = (RecyclerView) findViewById(R.id.blog_list);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setReverseLayout(true);
layoutManager.setStackFromEnd(true);
mBlogList.setHasFixedSize(true);
mBlogList.setLayoutManager(new LinearLayoutManager(this));
badge = (TextView)findViewById ( R.id.badge );
}
@Override
protected void onStart() {
super.onStart();
FirebaseRecyclerAdapter<Blog, searchActivity.BlogViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Blog, BlogViewHolder>(
Blog.class,
R.layout.blog_row,
searchActivity.BlogViewHolder.class,
mQuerySearch
) {
@Override
protected void populateViewHolder(BlogViewHolder viewHolder, Blog model, int position) {
}
protected void populateViewHolder(final com.fgvelectro.f.MainActivity.BlogViewHolder viewHolder, Blog model, int position) {
final String post_key = getRef(position).getKey();
viewHolder.setTitle(model.getTitle());
viewHolder.setDesc(model.getDesc());
viewHolder.setImage(getApplicationContext(), model.getImage());
viewHolder.setUsername(model.getUsername());
viewHolder.setLikeBtn(post_key);
viewHolder.mView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent singleBlogIntent = new Intent( com.fgvelectro.f.searchActivity.this, BlogSingleActivity.class);
singleBlogIntent.putExtra("blog_id", post_key);
startActivity(singleBlogIntent);
}
});
mDatabaseUsers.child(model.getUid()).child("image").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
String imageUrl = dataSnapshot.getValue().toString();
viewHolder.setUserimage(getApplicationContext(), imageUrl);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
viewHolder.mLikeBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
mProcessLike = true;
mDatabaseLike.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (mProcessLike) {
if (dataSnapshot.child(post_key).hasChild(mAuth.getCurrentUser().getUid())) {
mDatabaseLike.child(post_key).child(mAuth.getCurrentUser().getUid()).removeValue();
mProcessLike = false;
} else {
mDatabaseLike.child(post_key).child(mAuth.getCurrentUser().getUid()).setValue("RandomValue");
mProcessLike = false;
}
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
});
}
};
mBlogList.setAdapter(firebaseRecyclerAdapter);
}
private void checkUserExist() {
final String user_id = this.mAuth.getCurrentUser().getUid();
this.mDatabaseUsers.addValueEventListener(new ValueEventListener() {
public void onDataChange(DataSnapshot dataSnapshot) {
if (!dataSnapshot.hasChild(user_id)) {
Intent setupIntent = new Intent( com.fgvelectro.f.searchActivity.this, SetupActivity.class);
setupIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(setupIntent);
com.fgvelectro.f.searchActivity.this.startActivity(setupIntent);
}
if (user_id == null){Intent errorIntent = new Intent ( com.fgvelectro.f.searchActivity.this, ErrorActivity.class);
errorIntent.addFlags ( Intent.FLAG_ACTIVITY_CLEAR_TOP );
startActivity(errorIntent);
com.fgvelectro.f.searchActivity.this.startActivity (errorIntent);
}}
public void onCancelled(DatabaseError databaseError) {
}
});
}
public static class BlogViewHolder extends RecyclerView.ViewHolder{
View mView;
ImageButton mLikeBtn;
DatabaseReference mDatabaseLike;
FirebaseAuth mAuth;
public BlogViewHolder(View itemView) {
super(itemView);
mView = itemView;
mLikeBtn = (ImageButton) mView.findViewById(R.id.like_btn);
mDatabaseLike = FirebaseDatabase.getInstance().getReference().child("Likes");
mAuth = FirebaseAuth.getInstance();
mDatabaseLike.keepSynced(true);
}
public void setUserimage(Context context, String imageUrl) {
ImageView imageViewPostUserImage = (ImageView) mView.findViewById(R.id.imageview_post_userimage);
Glide
.with(context)
.load(imageUrl)
.into(imageViewPostUserImage);
}
public void setLikeBtn(final String post_key) {
mDatabaseLike.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.child(post_key).hasChild(mAuth.getCurrentUser().getUid())) {
mLikeBtn.setImageResource(R.mipmap.ic_thumb_up_black_24dp);
} else {
mLikeBtn.setImageResource(R.mipmap.ic_thumb_up_white_24dp);
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
public void setTitle(String title){
TextView post_title = (TextView) mView.findViewById(R.id.post_title);
post_title.setText(title);
}
public void setDesc(String desc){
TextView post_desc = (TextView) mView.findViewById(R.id.post_desc);
post_desc.setText(desc);
}
public void setUsername(String username){
TextView post_username = (TextView) mView.findViewById(R.id.post_username);
post_username.setText(username);
}
public void setImage(Context ctx, String image){
ImageView post_image = (ImageView) mView.findViewById(R.id.post_image);
Picasso.with(ctx).load(image).into(post_image);
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(menu.findItem(R.id.action_search));
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
Intent searchIntent = new Intent( com.fgvelectro.f.searchActivity.this, searchActivity.class);
searchIntent.putExtra("search", query);
startActivity(searchIntent);
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
//??????
return true;
}
});
return super.onCreateOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == R.id.action_add){
startActivity(new Intent( com.fgvelectro.f.searchActivity.this, PostActivity.class));
}
if (item.getItemId() == R.id.action_logout){
logout();
}
return super.onOptionsItemSelected(item);
}
private void logout() {
mAuth.signOut();
}
}
Photo: Of the error
解决方案 First, you need to query your database, example
mQuery = mDatabase.orderByChild("Title").equalTo("your value") then go to your firebaseRecyclerAdapter and replace:
FirebaseRecyclerAdapter<Blog, BlogViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Blog, BlogViewHolder>(
Blog.class,
R.layout.blog_row,
BlogViewHolder.class,
mDatabase
)
with:
final FirebaseRecyclerAdapter<Blog, BlogViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Blog, BlogViewHolder>(
Blog.class,
R.layout.blog_row,
BlogViewHolder.class,
mQuery
)
To find out more you can check the documentation here: https://firebase.google.com/docs/reference/android/com/google/firebase/database/Query
and the FirebaseUI documentation: https://github.com/firebase/FirebaseUI-Android
This is what i did:
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main_menu, menu);
SearchView searchView = (SearchView) MenuItemCompat.getActionView(menu.findItem(R.id.action_search));
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {
Intent searchIntent = new Intent(MainActivity.this, searchActivity.class);
searchIntent.putExtra("search", query);
startActivity(searchIntent);
return false;
}
@Override
public boolean onQueryTextChange(String newText) {
//??????
return true;
}
});
return super.onCreateOptionsMenu(menu);
}
and in the search activity:
String search = getIntent().getExtras().getString("search");
mQuerySearch = mDatabase.orderByChild("name").equalTo(search);
FirebaseRecyclerAdapter<Classified, searchActivity.ClassifiedViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Classified, searchActivity.ClassifiedViewHolder>(
Classified.class,
R.layout.classified_row,
searchActivity.ClassifiedViewHolder.class,
mQuerySearch
)
这篇关于Android - 如何过滤Firebase的RecyclerView？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
