Android - 如何使适配器布局保持原位
我使用firebase创建了一个简单的聊天应用，但在为left和right位置设置气泡元素方面遇到了一些麻烦。给别人留下泡沫，为我泡泡吧。
这是我的适配器：
public class MessageAdapterCustom extends RecyclerView.Adapter<MessageAdapterCustom.MessageViewHolder> {
private List<Messages> mMessageList;
private Context context;
private String mBubblePosition;
public MessageAdapterCustom(Context context, List<Messages> mMessageList, String mBubblePosition) {
this.context = context;
this.mMessageList = mMessageList;
this.mBubblePosition = mBubblePosition;
}
@Override
public MessageViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from( parent.getContext() )
.inflate( R.layout.message_single_layout_custom, parent, false );
return new MessageViewHolder( v );
}
public class MessageViewHolder extends RecyclerView.ViewHolder {
public TextView messageText;
public CircleImageView profileImage;
public MessageViewHolder(View view) {
super( view );
if(mBubblePosition.equals( "kiri" )) {
RelativeLayout right = (RelativeLayout) view.findViewById( R.id.sendingMessageLayout );
right.setVisibility( View.GONE );
messageText = (TextView) view.findViewById( R.id.message_text_layout_kiri );
profileImage = (CircleImageView) view.findViewById( R.id.message_profile_layout_kiri );
} else {
LinearLayout left = (LinearLayout) view.findViewById(R.id.recievemessageLayout);
left.setVisibility(View.GONE);
messageText = (TextView) view.findViewById( R.id.message_text_layout_kanan );
profileImage = (CircleImageView) view.findViewById( R.id.message_profile_layout_kanan );
}
}
}
@Override
public void onBindViewHolder(final MessageViewHolder holder, int position) {
final Messages msg = mMessageList.get( position );
holder.messageText.setText( msg.getMessage() );
Picasso.with( context )
.load( msg.getProfile_pic() )
.networkPolicy( NetworkPolicy.OFFLINE )
.into( holder.profileImage );
/*Picasso.with( context )
.load( msg.getProfile_pic() )
.networkPolicy( NetworkPolicy.OFFLINE )
.placeholder( R.drawable.no_profile )
.into( holder.profileImage, new Callback() {
@Override
public void onSuccess() {
}
@Override
public void onError() {
Picasso.with( context )
.load( msg.getProfile_pic() )
.networkPolicy( NetworkPolicy.OFFLINE )
.into( holder.profileImage );
}
} );*/
}
@Override
public int getItemCount() {
return mMessageList.size();
}
}
我的 ChatActivity：
public class ChatsActivity extends BaseActivity {
private Toolbar mToolbar;
private String mChatUser, mChatUserProfileImage;
private DatabaseReference mRootRef, mMessageDatabase;
private FirebaseAuth mAuth;
private TextView mTitleView, mLastSeenView;
private CircleImageView mProfileImage, mChatProfilePic;
private String online, image, mCurrentUserID;
private ImageButton mChatAddBtn, mChatSendBtn;
private EditText mChatMessageText;
private RecyclerView mMessagesList;
private final List<Messages> messagesList = new ArrayList<>();
private LinearLayoutManager mLinearLayout;
private MessageAdapter mAdapter;
private MessageAdapterCustom mAdapterCustom;
String URL_PROFILE;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate( savedInstanceState );
setContentView( R.layout.activity_chats );
mRootRef = FirebaseDatabase.getInstance().getReference();
/*mRootRef.keepSynced( true );*/
mAuth = FirebaseAuth.getInstance();
mCurrentUserID = mAuth.getCurrentUser().getUid();
mChatUser = getIntent().getStringExtra( "user_id" );
mChatUserProfileImage = getIntent().getStringExtra( "thumb_image" );
/*getWindow().setSoftInputMode( WindowManager.LayoutParams.SOFT_INPUT_STATE_VISIBLE );*/
mToolbar = (Toolbar) findViewById( R.id.toolbar );
setSupportActionBar( mToolbar );
mChatAddBtn = (ImageButton) findViewById( R.id.chat_add_btn );
mChatSendBtn = (ImageButton) findViewById( R.id.chat_send_btn );
mChatMessageText = (EditText) findViewById( R.id.chat_message );
mChatMessageText.requestFocus();
mMessagesList = (RecyclerView) findViewById( R.id.chat_messages_list );
mLinearLayout = new LinearLayoutManager( this );
mMessagesList.setHasFixedSize( true );
mMessagesList.setLayoutManager( mLinearLayout );
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayHomeAsUpEnabled( true );
actionBar.setDisplayShowCustomEnabled( true );
final String userName = getIntent().getStringExtra( "user_name" );
final String thumbProfilePic = getIntent().getStringExtra( "thumb_image" );
chatUserPic( mChatUser );
LayoutInflater layoutInflater = (LayoutInflater) this.getSystemService( Context.LAYOUT_INFLATER_SERVICE );
View action_bar_view = layoutInflater.inflate( R.layout.chat_custom_bar, null );
actionBar.setCustomView( action_bar_view );
mTitleView = (TextView) findViewById( R.id.custom_bar_title );
mLastSeenView = (TextView) findViewById( R.id.custom_bar_seen );
mProfileImage = (CircleImageView) findViewById( R.id.custom_bar_image );
mChatProfilePic = (CircleImageView) findViewById( R.id.message_profile_layout );
mTitleView.setText( userName );
mRootRef.child( "Users" ).child( mCurrentUserID ).child( "online" ).setValue( "Online" );
loadMessages();
mRootRef.child( "Users" ).child( mChatUser ).addValueEventListener( new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
mTitleView.setText( userName );
online = dataSnapshot.child( "online" ).getValue().toString();
image = dataSnapshot.child( "image" ).getValue().toString();
if (online.equals( "Online" )) {
mLastSeenView.setText( online );
} else {
GetTimeAgo getTimeAgo = new GetTimeAgo();
long lastTime = Long.parseLong( online );
String lastSeenTime = getTimeAgo.timeAgo( lastTime, getApplicationContext() );
mLastSeenView.setText( lastSeenTime );
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
} );
mChatMessageText.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View view) {
if(mAdapterCustom != null) {
mMessagesList.scrollToPosition( mAdapterCustom.getItemCount() - 1 );
}
}
} );
mChatMessageText.setOnFocusChangeListener( new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View view, boolean hasFocus) {
if (hasFocus) {
if(mAdapterCustom != null) {
mMessagesList.scrollToPosition( mAdapterCustom.getItemCount() - 1 );
}
} else {
if(mAdapterCustom != null) {
mMessagesList.scrollToPosition( mAdapterCustom.getItemCount() - 1 );
}
}
}
} );
mRootRef.child( "Chat" ).child( mCurrentUserID ).addValueEventListener( new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (!dataSnapshot.hasChild( mChatUser )) {
Map chatAddMap = new HashMap();
chatAddMap.put( "seen", false );
chatAddMap.put( "timestamp", ServerValue.TIMESTAMP );
Map chatUserMap = new HashMap();
chatUserMap.put( "Chat" + "/" + mCurrentUserID + "/" + mChatUser, chatAddMap );
chatUserMap.put( "Chat" + "/" + mChatUser + "/" + mCurrentUserID, chatAddMap );
mRootRef.updateChildren( chatUserMap, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
if (databaseError != null) {
Log.e( "CHAT_LOG", databaseError.getMessage().toString() );
} else {
mMessagesList.scrollToPosition( mAdapterCustom.getItemCount() - 1 );
}
}
} );
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
} );
mChatSendBtn.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick(View view) {
final String message = mChatMessageText.getText().toString();
if (TextUtils.isEmpty( message )) {
onError( "Message cannot be empty!" );
} else {
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
Query query = reference.child( "Users" ).child( mCurrentUserID );
query.addListenerForSingleValueEvent( new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
final String URL_PROFILE = dataSnapshot.child( "thumb_image" ).getValue().toString();
sendMessage( message, URL_PROFILE );
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
} );
}
}
} );
}
private void chatUserPic(String id) {
DatabaseReference reference = FirebaseDatabase.getInstance().getReference();
Query query = reference.child( "Users" ).child( id );
query.addListenerForSingleValueEvent( new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
final String URL_PROFILE = dataSnapshot.child( "thumb_image" ).getValue().toString();
Picasso.with( getApplication() )
.load( URL_PROFILE )
.networkPolicy( NetworkPolicy.OFFLINE )
.placeholder( R.drawable.no_profile )
.into( mProfileImage, new Callback() {
@Override
public void onSuccess() {
}
@Override
public void onError() {
Picasso.with( getApplication() )
.load( URL_PROFILE )
.placeholder( R.drawable.no_profile )
.into( mProfileImage );
}
} );
} else {
String URL_PROFILE = "no_profile";
Log.i( "PAUL", URL_PROFILE );
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
} );
}
private void loadMessages() {
mRootRef.child( "Messages" ).child( mCurrentUserID ).child( mChatUser ).addChildEventListener( new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
Messages message = dataSnapshot.getValue( Messages.class );
String currentUserID = message.current_user_id.toString();
/*mAdapter = new MessageAdapter( getApplicationContext(), messagesList );*/
if (currentUserID.equals( mCurrentUserID )) {
mAdapterCustom = new MessageAdapterCustom( getApplicationContext(), messagesList, "kanan" );
mMessagesList.setAdapter( mAdapterCustom );
messagesList.add( message );
mAdapterCustom.notifyDataSetChanged();
Log.i( "CHAT_ACTIVITY", "RIGHT" );
} else {
mAdapterCustom = new MessageAdapterCustom( getApplicationContext(), messagesList, "kiri" );
mMessagesList.setAdapter( mAdapterCustom );
messagesList.add( message );
mAdapterCustom.notifyDataSetChanged();
Log.i( "CHAT_ACTIVITY", "LEFT" );
}
/*mMessagesList.scrollToPosition( mAdapterCustom.getItemCount() - 1 );*/
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
} );
}
private void sendMessage(String message, String profile_pic) {
String current_user_ref = "Messages" + "/" + mCurrentUserID + "/" + mChatUser;
String chat_user_ref = "Messages" + "/" + mChatUser + "/" + mCurrentUserID;
DatabaseReference user_message_push = mRootRef.child( "Messages" )
.child( mCurrentUserID ).child( mChatUser ).push();
String push_id = user_message_push.getKey();
Map messageMap = new HashMap();
messageMap.put( "message", message );
messageMap.put( "seen", false );
messageMap.put( "type", "text" );
messageMap.put( "time", ServerValue.TIMESTAMP );
messageMap.put( "profile_pic", profile_pic );
messageMap.put( "current_user_id", mCurrentUserID );
Map messageUserMap = new HashMap();
messageUserMap.put( current_user_ref + "/" + push_id, messageMap );
messageUserMap.put( chat_user_ref + "/" + push_id, messageMap );
mRootRef.updateChildren( messageUserMap, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
if (databaseError != null) {
mChatMessageText.setText( "" );
Log.e( "SEND_MESSAGE_CHAT", databaseError.getMessage().toString() );
} else {
mChatMessageText.setText( "" );
mMessagesList.scrollToPosition( mAdapterCustom.getItemCount() - 1 );
}
}
} );
}
@Override
protected void onStart() {
super.onStart();
mRootRef.child( "Users" ).child( mCurrentUserID ).child( "online" ).setValue( "Online" );
mMessagesList.getLayoutManager().scrollToPosition( mLinearLayout.findLastVisibleItemPosition() + 1000 );
}
}
你看到了这一行：
if (currentUserID.equals( mCurrentUserID )) {
mAdapterCustom = new MessageAdapterCustom( getApplicationContext(), messagesList, "kanan" );
mMessagesList.setAdapter( mAdapterCustom );
messagesList.add( message );
mAdapterCustom.notifyDataSetChanged();
Log.i( "CHAT_ACTIVITY", "RIGHT" );
} else {
mAdapterCustom = new MessageAdapterCustom( getApplicationContext(), messagesList, "kiri" );
mMessagesList.setAdapter( mAdapterCustom );
messagesList.add( message );
mAdapterCustom.notifyDataSetChanged();
Log.i( "CHAT_ACTIVITY", "LEFT" );
}
当我尝试使用两个设备时，首先如果我自己尝试发送消息，则日志显示RIGHT，这意味着气球在右侧的位置。
但是当我用不同的设备（另一个人）回复时，适配器会将两个气泡向左移动。看起来因为它遵循最后一个适配器命令。
我的日志
每次message arrives时，如何保持适配器的位置，而不是如图所示更改视图元素的所有结构。
- 更新 - 我的布局：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/stackoverflow"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="5dp">
<LinearLayout
android:id="@+id/recievemessageLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<de.hdodenhof.circleimageview.CircleImageView
android:id="@+id/message_profile_layout_kiri"
android:layout_width="55dp"
android:layout_height="55dp"
android:src="@drawable/no_profile" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/message_text_layout_kiri"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginTop="5dp"
android:background="@drawable/message_text_background"
android:paddingBottom="5dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="5dp"
android:text="@string/message_here"
android:textColor="@android:color/white" />
<ImageView
android:id="@+id/message_buble_kiri"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_marginStart="10dp"
android:layout_marginTop="-10dp"
android:src="@drawable/buble_left" />
</LinearLayout>
</LinearLayout>
<RelativeLayout
android:id="@+id/sendingMessageLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/recievemessageLayout"
android:layout_marginTop="5dp"
android:orientation="horizontal">
<de.hdodenhof.circleimageview.CircleImageView
android:id="@+id/message_profile_layout_kanan"
android:layout_width="55dp"
android:layout_height="55dp"
android:layout_alignParentEnd="true"
android:src="@drawable/no_profile" />
<TextView
android:id="@+id/message_text_layout_kanan"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginEnd="10dp"
android:layout_marginTop="5dp"
android:layout_toStartOf="@+id/message_profile_layout_kanan"
android:background="@drawable/message_text_background"
android:paddingBottom="5dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="5dp"
android:text="@string/message_here"
android:textColor="@android:color/white" />
<ImageView
android:id="@+id/message_buble_kanan"
android:layout_width="20dp"
android:layout_height="20dp"
android:layout_alignEnd="@+id/message_text_layout_kanan"
android:layout_below="@+id/message_text_layout_kanan"
android:layout_marginTop="-10dp"
android:src="@drawable/buble_right" />
</RelativeLayout>
</RelativeLayout>
3 个答案:
答案 0 :(得分：3)
您当前正在创建两个不同的适配器，所有消息都指向相同的方向。相反，您应该创建一个适配器来决定如何一次对齐一条消息。
答案 1 :(得分：0)
具有多种视图类型的RecyclerView？
public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
class ViewHolder0 extends RecyclerView.ViewHolder {
...
public ViewHolder0(View itemView){
...
}
}
class ViewHolder2 extends RecyclerView.ViewHolder {
...
public ViewHolder2(View itemView){
...
}
@Override
public int getItemViewType(int position) {
// Just as an example, return 0 or 2 depending on position
// Note that unlike in ListView adapters, types don't have to be contiguous
return position % 2 * 2;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
switch (viewType) {
case 0: return new ViewHolder0(...);
case 2: return new ViewHolder2(...);
...
}
}
@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
switch (holder.getItemViewType()) {
case 0:
ViewHolder0 viewHolder0 = (ViewHolder0)holder;
...
break;
case 2:
ViewHolder2 viewHolder2 = (ViewHolder2)holder;
...
break;
}
}
}
答案 2 :(得分：0)
邮件列表中的项目主要有两种类型：已发送和已接收。您是否可以将数据模型设置为定义其类型，并在onCreateViewHolder()中为每种类型设置不同的视图。在onBindViewHolder()中，您需要根据项目类型再次绑定视图。
我已经修改了Naveen的例子：
interface MsgType {
int TYPE_SENT = 1;
int TYPE_RECEIVED = 2;
}
class Msg implements MsgType
{
String text ;
int type;
public Msg(String text, int type) {
// set
}
public String getText() {
return text;
}
public int getType() {
return type;
}
}
public class MyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
List<Msg> msgs;
class SentMsgVH extends RecyclerView.ViewHolder {
...
public SentMsgVH(View itemView){
...
}
}
class ReceivedMsgVh extends RecyclerView.ViewHolder {
...
public ReceivedMsgVh(View itemView){
...
}
@Override
public int getItemViewType(int position) {
return msgs.get(position).getType();
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v;
switch (viewType) {
case TYPE_SENT:
v = ... ; // inflate view
return new SentMsgVH(v);
case TYPE_RECEIVED:
v = ...; // inflate view
return new ReceivedMsgVh(v);
}
}
@Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, final int position) {
switch (getItemViewType(position)) {
case TYPE_SENT:
ViewHolder0 viewHolder0 = (SentMsgVH)holder;
...
break;
case TYPE_RECEIVED:
ViewHolder2 viewHolder2 = (ReceivedMsgVh)holder;
...
break;
}
}
}
在您的相应视图中，您应根据需要夸大正确的布局。
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