通过单击recyclerview项打开片段，然后移至该片段

Question

我正在尝试通过单击recyclerview项来打开片段，单击该项后得到的都是片段强度，在单击我的recyclerview后，我看到了要去的片段中的图像。有人知道我在做什么错吗？

public class MainActivity extends AppCompatActivity {

    private FragmentManager manger;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);


        ArrayList<Chat> chatList = new ArrayList<>();
        chatList.add(new Chat("send post card", " ", R.drawable.sentpostcard));
        chatList.add(new Chat("send greeting card", "happy holiday", R.drawable.greetingcard));
        chatList.add(new Chat("special designs", "choose a card", R.drawable.special));


        ChatAdapter adapter = new ChatAdapter(chatList);
        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.chatList);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(adapter);

    }



    // 1
    public class ChatAdapter extends RecyclerView.Adapter<ChatAdapter.ChatViewHolder>{

        // 7
        private ArrayList<Chat> chats;

        // 8
        public ChatAdapter(ArrayList<Chat> chats) {
            this.chats = chats;
        }

        // 10
        @Override
        public ChatViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            LayoutInflater inflater = getLayoutInflater();
            View v = inflater.inflate(R.layout.chat_list_item, parent, false); // false == do not attach to root
            return new ChatViewHolder(v);
        }

        // 11
        @Override
        public void onBindViewHolder(ChatViewHolder holder, int position) {
            holder.bind( chats.get(position) );
        }

        // 9
        @Override
        public int getItemCount() {
            return chats.size();
        }

        // 2
        public class ChatViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {

            //4
            private TextView textName, textChat;
            private ImageView imageChat;

            //we need to remember a chat for each view holder and we bind the chat object using the bind function
            //this will be useful later in the onClick Listener
            private Chat c;

            // view is the layout view ==> it contains all of the view in the layout file
            // 3
            public ChatViewHolder(View itemView) {
                super(itemView);
                // 5
                textName = (TextView) itemView.findViewById(R.id.textName);
                textChat = (TextView) itemView.findViewById(R.id.textChat);
                imageChat = (ImageView) itemView.findViewById(R.id.imageChat);



                // 12
                itemView.setOnClickListener(this);
            }

            // 6
            public void bind(Chat chat){
                c = chat;
                textName.setText(chat.getName());
                textChat.setText(chat.getText());
                imageChat.setImageResource(chat.getImage());
            }

            @Override
            public void onClick(View v) {

                getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new FragA()).commit();


            }

            }
        }
    }

Answer 1

很高兴看到您布局xml，但是从我可以看到：

您的回收者视图不在片段中 ，而是在MainActivity中 。 您可以使用setContentView(R.layout.activity_main);

当你做

getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new FragA()).commit();

您将新片段放入fragment_container视图组中。 但这根本不影响活动 。 因此，最终两个视图都可见 。

有两种方法可以解决此问题：

简单易用 -为您的片段设置纯色背景（即android:background="@android:color/black" ），并将android:clickable="true"到其根布局。 这样一来，您将无法看到片段下方的活动或与之互动。

更正确的方法 -将您的回收站视图放在一个片段中，然后使用getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, recyclerFragment).commit();将该fragment_container放入fragment_container getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, recyclerFragment).commit(); 。 然后，当您调用getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new FragA()).commit();时，该项目将替换为单击项时的新片段getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new FragA()).commit();

为了能够返回到回收站视图，您还需要调用addToBackStack方法