setTextIsSelectable如何防止键盘出现? [英] How does setTextIsSelectable prevent the keyboard from appearing?

问题描述

如果我使用包含一个EditText的单个Activity创建一个简单的应用程序，那么我会这样做

If I create a simple app with single Activity that contains a single EditText, and I do

EditText editText = (EditText) findViewById(R.id.editText);
editText.setTextIsSelectable(true);

然后防止键盘出现(在我对Android 5.0和7.1的测试中).这些问题是我想要的:

then this prevents the keyboard from appearing (in my tests on Android 5.0 and 7.1). This is what I want, as requested in these questions:

• 从EditText禁用软键盘，但仍然允许复制/粘贴?
• 如何针对特定的应用禁用Android软键盘活动吗?
• Android:在所有EditText上禁用软键盘
• 如何在edittext上禁用键盘弹出?
• 在EditText上禁用键盘

• Disable soft-keyboard from EditText but still allow copy/paste?
• How to disable Android Soft Keyboard for a particular activity?
• Android: Disable soft keyboard at all EditTexts
• How to disable keypad popup when on edittext?
• Disable keyboard on EditText

源代码是

public void setTextIsSelectable(boolean selectable) {
    if (!selectable && mEditor == null) return; // false is default value with no edit data

    createEditorIfNeeded();
    if (mEditor.mTextIsSelectable == selectable) return;

    mEditor.mTextIsSelectable = selectable;
    setFocusableInTouchMode(selectable);
    setFocusable(selectable);
    setClickable(selectable);
    setLongClickable(selectable);

    // mInputType should already be EditorInfo.TYPE_NULL and mInput should be null

    setMovementMethod(selectable ? ArrowKeyMovementMethod.getInstance() : null);
    setText(mText, selectable ? BufferType.SPANNABLE : BufferType.NORMAL);

    // Called by setText above, but safer in case of future code changes
    mEditor.prepareCursorControllers();
}

但是我看不出这会阻止输入法的出现.

But I don't see what about this disables the Input Method from appearing.

无论是否设置setTextIsSelectable，调用以下方法都将返回true.

Calling the following methods all return true whether I set setTextIsSelectable or not.

editText.isFocusable();             // true
editText.isFocusableInTouchMode();  // true
editText.isClickable();             // true
editText.isLongClickable();         // true

我之所以问这个问题，部分是因为我很好奇，还因为我需要在我的应用程序中禁用系统键盘.我想了解正在发生的事情，以便可以确定它确实在做我认为正在做的事情.

I'm partly asking because I'm curious, but also because I need to disable the system keyboard in my app. I want to understand what is happening so that I can be sure that it is really doing what I think it is doing.

更新

后续问答:

• 如何在触摸后启用键盘使用setTextIsSelectable禁用它

推荐答案

当您调用TextView.setTextIsSelectable(true)然后由于

The keyboard isn't shown when you call TextView.setTextIsSelectable(true) and then select text as a result of Editor.startSelectionActionModeInternal, which checks if TextView.isTextSelectable is false before showing the text selection ActionMode.

    final boolean selectionStarted = mTextActionMode != null;
    if (selectionStarted && !mTextView.isTextSelectable() && mShowSoftInputOnFocus) {
        // Show the IME to be able to replace text, except when selecting non editable text.
        final InputMethodManager imm = InputMethodManager.peekInstance();
        if (imm != null) {
            imm.showSoftInput(mTextView, 0, null);
        }
    }

我猜想为什么要以这种方式实现它，可能是因为框架团队决定他们希望文本Editor可以预测为可选择的，以免键盘在屏幕上移动而在屏幕上跳动.这可能只是一个UI决定.根据git的说法，自2012年以来就是这种方式，但是该提交未提及有关该实现的任何具体内容.

My guess to why it's implemented this way is probably because the framework team decided they wanted text Editor could predict to be selectable to not jump around the screen as a result of the keyboard moving it around. It was probably just a UI decision. According to git it's been that way since 2012, but the commit doesn't mention anything specifically regarding that implementation.

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