为什么每当我尝试选择文本时,我的Android UI都会表现得很糟糕？

Question

我正在开发Android应用程序(API 15及更低版本).在我的UI中,我有一个TextView元素,我希望人们能够从中进行选择和复制.这是我的元素的样子:

<LinearLayout
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="20dp" />
    <TextView
        android:id="@+id/chat_info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="0"
        android:padding="8dp" />

    <TextView
        android:id="@+id/chat_message"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:layout_margin="2dp"
        android:padding="8dp"
        android:textSize="18sp"
        android:gravity="right"
        android:textColor="@color/BLACK"
        android:textIsSelectable="true"/>
</LinearLayout>

此TextView位于使用SimpleCursorAdapter填充的ListView中.这个ListView看起来像这样:

<ListView
    android:id="@+id/chat_text_display"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:layout_marginTop="2dp"
    android:layout_marginRight="2dp" 
    android:layout_marginBottom="2dp"
    android:layout_marginLeft="2dp"
    android:padding="5dp"
    android:background="@color/WHITE"
    android:divider="@null"
    android:divider_height="0dp"
    android:stackFromBottom="true"
    android:transcriptMode="alwaysScroll"/>

ListView在LinearLayout中:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@drawable/custom_border">
    <ListView
        android:id="@+id/chat_text_display"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:layout_marginTop="2dp"
        android:layout_marginRight="2dp"
        android:layout_marginBottom="2dp"
        android:layout_marginLeft="2dp"
        android:padding="5dp"
        android:background="@color/WHITE"
        android:divider="@null"
        android:dividerHeight="0dp"
        android:stackFromBottom="true"
        android:transcriptMode="alwaysScroll"/>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0"
        android:orientation="horizontal"
        android:layout_marginTop="2dp"
        android:layout_marginRight="1dp"
        android:layout_marginBottom="2dp"
        android:layout_marginLeft="2dp">
        <Button
            android:id="@+id/text_send"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="0"
            android:layout_gravity="center_vertical"
            android:enabled="false"
            android:text="@string/chat_button"/>
        <EditText
            android:id="@+id/chat_text_compose"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:minLines="3"
            android:maxLines="3"
            android:paddingLeft="8dp"
            android:background="@color/WHITE"
            android:hint="@string/chat_hint"/>
    </LinearLayout>
</LinearLayout>

每当我尝试单击chat_info或chat_message中的文本时,都不会发生任何事情.但是,每当我尝试双击文本时:

1. 我的整个用户界面向下移动
2. "工具栏"显示在屏幕顶部
3. "工具栏"立即消失,我的显示屏向后移动

在"工具栏"中,这是我看到的:

它看起来像是复制对话框,但它会立即消失.

我可以使用a在LinearLayout中插入一个"独立"TextView,android:textIsSelectable="true"并且复制对话框可以正常工作; 这意味着它会一直保持可见,直到我选择"复制".

我可以提供的最后一条信息是我的LinearLayout在使用带有ViewPager的片段的选项卡式活动中.我只是看不出这是怎么回事,因为就像我说的那样,我可以在LinearLayout中添加另一个元素(例如TextView),并且复制对话框可以完美地运行.我想我会添加这篇文章以获得完全清晰.

我想要做的就是选择chat_info或chat_message中的文本,这样我就可以将文本复制并粘贴到其他地方.

有任何想法吗？

新的消息!!!

当我在"chat_text_compose"EditText中选择文本时,复制工具栏会正常显示.此时,我可以在TextView区域中成功选择文本.奇怪的.

更新:控制此布局的代码

public class Chat extends Fragment {

    private View rootView;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        rootView = inflater.inflate(R.layout.chat, container, false);
        return rootView;
    }

    @Override
    public void onViewCreated(View rootView, Bundle savedInstanceState) {
        super.onViewCreated(rootView, savedInstanceState);
        displayChats();
    }

    @Override
    public void onResume() {
        super.onResume();
        displayChats();
    }

    @Override
    public View getView() {
        final Button sendChatButton = (Button) rootView.findViewById(R.id.text_send);
        final EditText chatEntryWindow = (EditText) rootView.findViewById(R.id.chat_text_compose);

        // Check to see if the text entry field is empty. If it is empty, disable the "Send" button.
        chatEntryWindow.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {}

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                if(s.length() != 0){
                    sendChatButton.setEnabled(true);
                } else {
                    sendChatButton.setEnabled(false);
                }
            }

            @Override
            public void afterTextChanged(Editable s) {}
        });

        // Send the chat
        if(sendChatButton != null) {
            sendChatButton.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Date rightNow = new Date();
                    SimpleDateFormat timeSDF = new SimpleDateFormat(Constants.SIMPLE_TIME, Locale.US);
                    SimpleDateFormat dateSDF = new SimpleDateFormat(Constants.SIMPLE_DATE, Locale.US);
                    SharedPreferences myAppPreferences = getContext().getSharedPreferences(Constants.PREFS_NAME, Context.MODE_PRIVATE);
                    String message = chatEntryWindow.getText().toString();
                    String username = myAppPreferences.getString("username", Constants.TABLET_ID);
                    Message myMessage = new Message(true, username, message, 0, dateSDF.format(rightNow), timeSDF.format(rightNow));
                    if(!message.equals("")){
                        LogChat logChat = new LogChat(getActivity());
                        logChat.addNewMessage(myMessage);
                        new SendChat(getActivity(), message, username).execute();
                        chatEntryWindow.setText("");
                        sendChatButton.setEnabled(false);
                        if(v != null){
                            InputMethodManager inputMethodManager = (InputMethodManager) getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
                            inputMethodManager.hideSoftInputFromWindow(v.getWindowToken(), 0);
                        }
                        displayChats();
                    }
                }
            });
        }
        return super.getView();
    }

    public void displayChats(){
        DatabaseHelper myDBHelper = new DatabaseHelper(getActivity());
        final Cursor chatsCursor = myDBHelper.getChatsCursor();
        String[] fromColumns = {"messageInfo","messageText"};
        int[] toViews = {R.id.chat_information, R.id.chat_message};
        SimpleCursorAdapter simpleCursorAdapter = new SimpleCursorAdapter(getContext(), R.layout.line_of_chat, chatsCursor, fromColumns, toViews, 0);
        ListView myListView = (ListView) rootView.findViewById(R.id.chat_text_display);

        // Draw the list
        myListView.setAdapter(simpleCursorAdapter);

        myDBHelper.close();
    }
}

Answer 1

仅供参考，以防万一其他人来寻找答案。

我放弃了尝试这种方式，使用“android:textIsSelectable='true'”，并走了另一条路。相反，我设置了一个“onItemLongClickListener()”并使用 ClipboardManager 来抓取聊天中的文本：

public void displayChats(){
        final Context context = getContext();
        final ClipboardManager clipboardManager = (ClipboardManager)context.getSystemService(context.CLIPBOARD_SERVICE);
        DatabaseHelper myDBHelper = new DatabaseHelper(getActivity());
        final Cursor chatsCursor = myDBHelper.getChatsCursor();
        String[] fromColumns = {"messageInfo","messageText"};
        int[] toViews = {R.id.chat_information, R.id.chat_message};
        SimpleCursorAdapter simpleCursorAdapter = new SimpleCursorAdapter(getContext(), R.layout.line_of_chat, chatsCursor, fromColumns, toViews, 0);
        ListView myListView = (ListView) rootView.findViewById(R.id.chat_text_display);

        // Draw the list
        myListView.setAdapter(simpleCursorAdapter);

        myListView.setOnLongClickListener(new AdapterView.OnItemLongClickListener(){
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id){
                TextView chatText = (TextView)view.findViewById(R.id.chat_message);
                ClipData clipData = ClipData.newPlainText("copied chat", chatText.getText.toString());
                if(clipboardManager.hasPrimaryClip()){
                    Toast.makeText(this, "copied text", Toast.LENGTH_LONG).show();
                }
                return false;
            }
        });
        myDBHelper.close();
    }