startListening() 在 onBindviewHolder 中不起作用，在 onStart() 方法中也不起作用。
评论后，此行显示MainAcitvity，但不显示此活动中的帖子项目。如果我请求添加 onStart() 方法，它会显示红色热线。
public class MainActivity extends AppCompatActivity {
private NavigationView navigationView;
private DrawerLayout drawerLayout;
private ActionBarDrawerToggle actionBarDrawerToggle;
private RecyclerView postlist;
private Toolbar mToolbar;
private CircleImageView NavProfileImage;
private TextView NavProfileUserName;
private ImageButton AddNewPostButton;
private FirebaseAuth mAuth;
private DatabaseReference UsersRef, PostsRef;
String currentUserID;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAuth = FirebaseAuth.getInstance();
currentUserID = mAuth.getCurrentUser().getUid();
UsersRef = FirebaseDatabase.getInstance().getReference().child("Users");
PostsRef = FirebaseDatabase.getInstance().getReference().child("Posts");
mToolbar = (Toolbar) findViewById(R.id.main_page_toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setTitle("Home");
AddNewPostButton = (ImageButton) findViewById(R.id.add_new_post_button);
drawerLayout = (DrawerLayout) findViewById(R.id.drawable_layout);
actionBarDrawerToggle = new ActionBarDrawerToggle(MainActivity.this, drawerLayout, R.string.drawer_open, R.string.drawer_close);
drawerLayout.addDrawerListener(actionBarDrawerToggle);
actionBarDrawerToggle.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
navigationView = (NavigationView) findViewById(R.id.navigation_view);
postlist = (RecyclerView) findViewById(R.id.all_users_post_list);
postlist.setHasFixedSize(true);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setReverseLayout(true);
linearLayoutManager.setStackFromEnd(true);
postlist.setLayoutManager(linearLayoutManager);
View navView = navigationView.inflateHeaderView(R.layout.nav_header);
NavProfileImage = (CircleImageView) navView.findViewById(R.id.nav_profile_image);
NavProfileUserName = (TextView) navView.findViewById(R.id.nav_user_name);
UsersRef.child(currentUserID).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
if (dataSnapshot.hasChild("fullname")) {
String fullname = dataSnapshot.child("fullname").getValue().toString();
NavProfileUserName.setText(fullname);
}
if (dataSnapshot.hasChild("profileimage")) {
String image = dataSnapshot.child("profileimage").getValue().toString();
Picasso.get().load(image).placeholder(R.drawable.profile).into(NavProfileImage);
} else {
Toast.makeText(MainActivity.this, "User doesnot Exist here...", Toast.LENGTH_SHORT).show();
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item) {
UserMenuSelector(item);
return false;
}
});
AddNewPostButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SendUserToPostActivity();
}
});
DisplayAllUsersPosts();
}
private void DisplayAllUsersPosts() {
FirebaseRecyclerOptions<Posts> options = new FirebaseRecyclerOptions.Builder<Posts>().setQuery(PostsRef, Posts.class).build();
final FirebaseRecyclerAdapter<Posts, PostsViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Posts, PostsViewHolder>(options) {
@Override
protected void onBindViewHolder(@NonNull PostsViewHolder holder, int position, @NonNull Posts model) {
holder.username.setText(model.getFullname());
holder.time.setText(" " + model.getTime());
holder.date.setText(" " + model.getDate());
holder.description.setText(model.getDescription());
Picasso.get().load(model.getProfileimage()).into(holder.user_post_image);
Picasso.get().load(model.getPostimage()).into(holder.postImage);
}
@NonNull
@Override
public PostsViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.all_posts_layout, parent, false);
PostsViewHolder viewHolder = new PostsViewHolder(view);
return viewHolder;
}
};
//firebaseRecyclerAdapter.startListening();
postlist.setAdapter(firebaseRecyclerAdapter);
}
public static class PostsViewHolder extends RecyclerView.ViewHolder {
TextView username, date, time, description;
CircleImageView user_post_image;
ImageView postImage;
public PostsViewHolder(View itemView) {
super(itemView);
username = itemView.findViewById(R.id.post_user_name);
date = itemView.findViewById(R.id.post_date);
time = itemView.findViewById(R.id.post_time);
description = itemView.findViewById(R.id.post_Description);
postImage = itemView.findViewById(R.id.post_image);
user_post_image = itemView.findViewById(R.id.post_profile_image);
}
}
private void SendUserToPostActivity() {
Intent postIntent = new Intent(MainActivity.this, PostActivity.class);
startActivity(postIntent);
}
@Override
protected void onStart() {
super.onStart();
FirebaseUser currentUser = mAuth.getCurrentUser();
if (currentUser == null) {
SendUserToLoginActivity();
} else {
CheckUserExistence();
}
}
private void CheckUserExistence() {
final String current_user_id = mAuth.getCurrentUser().getUid();
UsersRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if (!dataSnapshot.hasChild(current_user_id)) {
SendUserToSetupActivity();
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
private void SendUserToSetupActivity() {
Intent setupIntent = new Intent(MainActivity.this, SetupActivity.class);
setupIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(setupIntent);
finish();
}
private void SendUserToLoginActivity() {
Intent loginIntent = new Intent(MainActivity.this, LoginActivity.class);
loginIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(loginIntent);
finish();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (actionBarDrawerToggle.onOptionsItemSelected(item)) {
return true;
}
return super.onOptionsItemSelected(item);
}
private void UserMenuSelector(MenuItem item) {
switch (item.getItemId()) {
case R.id.nav_post:
SendUserToPostActivity();
break;
case R.id.nav_profile:
Toast.makeText(this, "Profile", Toast.LENGTH_SHORT).show();
break;
case R.id.nav_home:
Toast.makeText(this, "Home", Toast.LENGTH_SHORT).show();
break;
case R.id.nav_friend:
Toast.makeText(this, "Friends", Toast.LENGTH_SHORT).show();
break;
case R.id.nav_find_friends:
Toast.makeText(this, "Find Friends", Toast.LENGTH_SHORT).show();
break;
case R.id.nav_messages:
Toast.makeText(this, "Messages", Toast.LENGTH_SHORT).show();
break;
case R.id.nav_settings:
Toast.makeText(this, "Setting", Toast.LENGTH_SHORT).show();
break;
case R.id.nav_logout:
mAuth.signOut();
SendUserToLoginActivity();
break;
}
}
}
04-19 12：10：05.836 4162-4162/androidwork.app.chadii.socialchatapp E/Android运行时：致命异常：main 进程： androidwork.app.chadii.socialchatapp， PID： 4162 android.view.InflateException： 二进制 XML 文件行 #25： 膨胀类时出错 at android.view.LayoutInflater.createView(LayoutInflater.java：633) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java：743) at android.view.LayoutInflater.rInflate(LayoutInflater.java：806) at android.view.LayoutInflater.rInflate(LayoutInflater.java：809) at android.view.LayoutInflater.rInflate(LayoutInflater.java：809) at android.view.LayoutInflater.inflate(LayoutInflater.java：504) at android.view.LayoutInflater.inflate(LayoutInflater.java：414) at androidwork.app.chadii.socialchatapp.MainActivity$4.onCreateViewHolder(MainActivity.java：165) at androidwork.app.chadii.socialchatapp.MainActivity$4.onCreateViewHolder(MainActivity.java：150) at androidx.recyclerview.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java：6794) at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java：5975) at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java：5858) at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java：5854) at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java：2230) at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java：1557) at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java：1517) at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java：612) at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java：3924) at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java：3641) at androidx.recyclerview.widget.RecyclerView.consumePendingUpdateOperations(RecyclerView.java：1888) at androidx.recyclerview.widget.RecyclerView$1.run(RecyclerView.java：407) at android.view.Choreographer$CallbackRecord.run(Choreographer.java：767) at android.view.Choreographer.doCallbacks(Choreographer.java：580) at android.view.Choreographer.doFrame(Choreographer.java：549) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java：753) at android.os.Handler.handleCallback(Handler.java：739) at android.os.Handler.dispatchMessage(Handler.java：95) at android.os.Looper.loop(Looper.java：135) at android.app.ActivityThread.main(ActivityThread.java：5293) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java：372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java：903) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java：698) 由： java.lang.reflect.InvocationTargetException at java.lang.reflect.Constructor.newInstance(Native Method) at java.lang.reflect.Constructor.newInstance(Constructor.java：288) at android.view.LayoutInflater.createView(LayoutInflater.java：607) at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java：743) at android.view.LayoutInflater.rInflate(LayoutInflater.java：806) at android.view.LayoutInflater.rInflate(LayoutInflater.java：809) at android.view.LayoutInflater.rInflate(LayoutInflater.java：809) at android.view.LayoutInflater.inflate(LayoutInflater.java：504) at android.view.LayoutInflater.inflate(LayoutInflater.java：414) 在
ERROR_HERE
androidwork.app.chadii.socialchatapp.MainActivity$4.onCreateViewHolder(MainActivity.java：165) at androidwork.app.chadii.socialchatapp.MainActivity$4.onCreateViewHolder(MainActivity.java：150) at androidx.recyclerview.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java：6794) at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java：5975) at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java：5858) at androidx.recyclerview.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java：5854) at androidx.recyclerview.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java：2230) at androidx.recyclerview.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java：1557) at androidx.recyclerview.widget.LinearLayoutManager.fill(LinearLayoutManager.java：1517) at androidx.recyclerview.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java：612)at androidx.recyclerview.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java：3924) at androidx.recyclerview.widget.RecyclerView.dispatchLayout(RecyclerView.java：3641) at androidx.recyclerview.widget.RecyclerView.consumePendingUpdateOperations(RecyclerView.java：1888) at androidx.recyclerview.widget.RecyclerView$1.run(RecyclerView.java：407) at android.view.Choreographer$CallbackRecord.run(Choreographer.java：767) at android.view.Choreographer.doCallbacks(Choreographer.java：580) at android.view.Choreographer.doFrame(Choreographer.java：549) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java：753) at android.os.Handler.handleCallback(Handler.java：739) at android.os.Handler.dispatchMessage(Handler.java：95) at android.os.Looper.loop(Looper.java：135) at android.app.ActivityThread.main(ActivityThread.java：5293) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java：372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java：903) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java：698) 原因：java.lang.IllegalArgumentException：不支持 ScaleType FIT_CENTER。 at de.hdodenhof.circleimageview.CircleImageView.setScaleType(CircleImageView.java：134) 在android.widget.ImageView。(图片视图.java：169) 在android.widget.ImageView。(图片浏览.java：135) at de.hdodenhof.circleimageview.CircleImageView.(CircleImageView.java：98) at de.hdodenhof.circleimageview.CircleImageView.(CircleImageView.java：94)
java.lang.IllegalArgumentException: ScaleType FIT_CENTER not supported. at de.hdodenhof.circleimageview.CircleImageView.setScaleType(CircleImageView.java:134)
CircleImageView 仅支持ScaleType.CENTER_CROP
链接 https://github.com/hdodenhof/CircleImageView/blob/master/circleimageview/src/main/java/de/hdodenhof/circleimageview/CircleImageView.java
public class CircleImageView extends ImageView {
private static final ScaleType SCALE_TYPE = ScaleType.CENTER_CROP;
...
@Override
public void setScaleType(ScaleType scaleType) {
if (scaleType != SCALE_TYPE) {
throw new IllegalArgumentException(String.format("ScaleType %s not supported.", scaleType));
}
}
...