java - 当软键盘在聊天应用程序中可见时，保持 recyclerview 的最后一项可见

Question

我在 android studio 中创建了一个简单的聊天应用程序。最初，当我发送文本时，recyclerview 的最后一项始终处于焦点，但是当我隐藏软键盘然后再次单击 editext 发送消息时，recyclerview 中的最后一项不处于焦点。当软键盘处于焦点时，我需要向下滚动以查看最后一条消息。下面是布局和 MainActivity 代码:

EditText messageEdt;
ImageView sendBtn;
RecyclerView recyclerView;
CustomAdapter adapter;
List<Model> chatList;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    messageEdt = (EditText) findViewById(R.id.messageText);
    sendBtn = (ImageView) findViewById(R.id.sendBtn);
    recyclerView = (RecyclerView) findViewById(R.id.recyclerChatList);
    chatList = new ArrayList<>();
    adapter = new CustomAdapter(this);
    recyclerView.setAdapter(adapter);
    recyclerView.setHasFixedSize(true);
    recyclerView.setLayoutManager(new LinearLayoutManager(this));
    messageEdt.setOnFocusChangeListener(new View.OnFocusChangeListener() {
        @Override
        public void onFocusChange(View view, boolean b) {
            if(b && adapter.getItemCount()>1){
                recyclerView.getLayoutManager().smoothScrollToPosition(recyclerView,null,adapter.getItemCount()-1);
            }
        }
    });
    getSupportActionBar().hide();

}

private void getData() {
    String messageStr = messageEdt.getText().toString().replaceAll("[ ]","%20");
    Log.e("messageStr",messageStr);
    Model model = new Model();
    model.setMessage(messageEdt.getText().toString());
    model.setUser("User");
    chatList.add(model);

    messageEdt.setText("");

    adapter.getChatList(chatList);
    adapter.notifyDataSetChanged();
    if(adapter.getItemCount()>1){
        recyclerView.getLayoutManager().smoothScrollToPosition(recyclerView,null,adapter.getItemCount()-1);
    }
    url = "http://chat.vicz.in/get/";
    url = url.concat(messageStr);
    Log.e("Url", url);
    StringRequest getData = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            try {
                url = "http://chat.vicz.in/get/";
                Log.e("Response", response);
                JSONObject responseObj = new JSONObject(response);
                String stringResponse = responseObj.getString("response");
                Model data = new Model();
                data.setMessage(stringResponse);
                data.setUser("Bot");
                chatList.add(data);
                recyclerView.smoothScrollToPosition(chatList.size()-1);
                adapter.getChatList(chatList);
                adapter.notifyDataSetChanged();
                if(adapter.getItemCount()>1){
                    recyclerView.getLayoutManager().smoothScrollToPosition(recyclerView,null,adapter.getItemCount()-1);
                }

            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            url = "http://chat.vicz.in/get/";
        }
    });
    getData.setRetryPolicy(new DefaultRetryPolicy(30000, 5, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
    Volley.newRequestQueue(this).add(getData);


}

public void sendMessage(View view) {
    getData();
}

这是我的聊天应用程序的布局:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent"

tools:context="com.example.admin.chatbot.MainActivity">



    <android.support.v7.widget.RecyclerView
        android:id="@+id/recyclerChatList"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:background="@null"
        android:divider="@null"
        android:transcriptMode="alwaysScroll"
        android:stackFromBottom="true">

    </android.support.v7.widget.RecyclerView>



        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <EditText
                android:id="@+id/messageText"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="80"
                android:hint="Enter Message" />

            <ImageView
                android:id="@+id/sendBtn"
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="20"
                android:onClick="sendMessage"
                android:src="@android:drawable/ic_menu_send" />
        </LinearLayout>

我已经使用过 smoothScrollToPosition() 但它仅在软键盘从一开始就可见时才起作用。但是，如果我隐藏然后聚焦软键盘，则列表中的最后一项不在焦点上。

Answer 1

您可以尝试以下选项:

1. 在 androidManifest.xml ( Adjust Resize ) 中的所需 Activity 中使用 AdjustResize，或者您可以使用 AdjustPan(尽管它会隐藏顶部的工具栏)
2. 如果 Adjust resize 不起作用，那么如果您是

LinearLayoutManager layoutManager = new LinearLayoutManager(mActivity);
layoutManager.setStackFromEnd(true);(为我工作)

(如果使用 setReverseLayout(true) 则 List 将以相反的顺序显示)

另一个答案建议使用 onClickListener 和

mRecyclerView.smoothScrollToPosition(mAdapter.getItemCount() - 1);