通過單擊recyclerview項打開片段，然后移至該片段

Question

我正在嘗試通過單擊recyclerview項來打開片段，單擊該項后得到的都是片段強度，在單擊我的recyclerview后，我看到了要去的片段中的圖像。有人知道我在做什么錯嗎？

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

很高興看到您布局xml，但是從我可以看到：

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

當你做

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

您將新片段放入fragment_container視圖組中。 但這根本不影響活動 。 因此，最終兩個視圖都可見 。

有兩種方法可以解決此問題：

簡單易用 -為您的片段設置純色背景（即android:background="@android:color/black" ），並將android:clickable="true"到其根布局。 這樣一來，您將無法看到片段下方的活動或與之互動。

更正確的方法 -將您的回收站視圖放在一個片段中，然后使用getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, recyclerFragment).commit();將該fragment_container放入fragment_container getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, recyclerFragment).commit(); 。 然后，當您調用getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new FragA()).commit();時，該項目將替換為單擊項時的新片段getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,new FragA()).commit();

為了能夠返回到回收站視圖，您還需要調用addToBackStack方法