用于显示文本选择句柄的 EditText 的自定义剪切/复制操作栏 [英] Custom cut/copy action bar for EditText that shows text selection handles

问题描述

我有一个应用程序，我希望能够显示一个 TextView(或 EditText)，允许用户选择一些文本，然后按一个按钮来处理该文本.在 Honeycomb 之前的 Android 版本上实现这一点没有问题，但在 Honeycomb 及更高版本上，默认的长按操作是显示带有复制/剪切/粘贴选项的操作栏.我可以截取长按以显示我自己的操作栏，但是我没有显示文本选择句柄.

I have an app where I want to be able to show a TextView (or EditText) that allows the user to select some text, then press a button to have something done with that text. Implementing this on Android versions prior to Honeycomb is no problem but on Honeycomb and above the default long-press action is to show an action bar with Copy/Cut/Paste options. I can intercept long-press to show my own action bar, but then I do not get the text selection handles displayed.

一旦我启动了自己的 ActionMode，我该如何显示文本选择句柄?

Once I have started my own ActionMode how do I get the text selection handles displayed?

这是我用来启动 ActionMode 的代码，除了没有显示文本选择句柄之外，它可以工作:

Here is the code I'm using to start the ActionMode, which works except there are no text selection handles displayed:

public boolean onLongClick(View v) {
    if(actionMode == null)
        actionMode = startActionMode(new QuoteCallback());
    return true;
}

class QuoteCallback implements ActionMode.Callback {

    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        MenuInflater inflater = mode.getMenuInflater();
        inflater.inflate(R.menu.quote, menu);
        return true;
    }

    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        return false;
    }

    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        switch(item.getItemId()) {

        case R.id.quote:
            Log.d(TAG, "Selected menu");
            mode.finish();
            // here is where I would grab the selected text
            return true;
        }
        return false;
    }

    public void onDestroyActionMode(ActionMode mode) {
        actionMode = null;
    }
}

推荐答案

我想出了自己问题的答案；TextView(因此 EditText)有一个方法 setCustomSelectionActionModeCallback() 应该用来代替 startActionMode().使用它可以自定义 TextView 用于文本选择的菜单.示例代码:

I figured out the answer to my own question; TextView (and therefore EditText) has a method setCustomSelectionActionModeCallback() which should be used instead of startActionMode(). Using this enables customisation of the menu used by TextView for text selection. Sample code:

bodyView.setCustomSelectionActionModeCallback(new StyleCallback());

StyleCallback 通过移除 Select All 并添加一些样式操作来自定义文本选择菜单:

where StyleCallback customises the text selection menu by removing Select All and adding some styling actions:

class StyleCallback implements ActionMode.Callback {

    public boolean onCreateActionMode(ActionMode mode, Menu menu) {
        Log.d(TAG, "onCreateActionMode");
        MenuInflater inflater = mode.getMenuInflater();
        inflater.inflate(R.menu.style, menu);
        menu.removeItem(android.R.id.selectAll);
        return true;
    }

    public boolean onPrepareActionMode(ActionMode mode, Menu menu) {
        return false;
    }

    public boolean onActionItemClicked(ActionMode mode, MenuItem item) {
        Log.d(TAG, String.format("onActionItemClicked item=%s/%d", item.toString(), item.getItemId()));
        CharacterStyle cs;
        int start = bodyView.getSelectionStart();
        int end = bodyView.getSelectionEnd();
        SpannableStringBuilder ssb = new SpannableStringBuilder(bodyView.getText());

        switch(item.getItemId()) {

        case R.id.bold:
            cs = new StyleSpan(Typeface.BOLD);
            ssb.setSpan(cs, start, end, 1);
            bodyView.setText(ssb);
            return true;

        case R.id.italic:
            cs = new StyleSpan(Typeface.ITALIC);
            ssb.setSpan(cs, start, end, 1);
            bodyView.setText(ssb);
            return true;

        case R.id.underline:
            cs = new UnderlineSpan();
            ssb.setSpan(cs, start, end, 1);
            bodyView.setText(ssb);
            return true;
        }
        return false;
    }

    public void onDestroyActionMode(ActionMode mode) {
    }
}

菜单添加的 XML 是:

The XML for the menu additions is:

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:id="@+id/italic"
          android:showAsAction="always"
          android:icon="@drawable/italic"
          android:title="Italic"/>
    <item android:id="@+id/bold"
          android:showAsAction="always"
          android:icon="@drawable/bold"
          android:title="Bold"/>
    <item android:id="@+id/underline"
          android:showAsAction="always"
          android:icon="@drawable/underline"
          android:title="Underline"/>
</menu>

这篇关于用于显示文本选择句柄的 EditText 的自定义剪切/复制操作栏的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！