android - 使用 InputMethodManager.showSoftKeyboard() 时如何禁用自动完成/建议

Question

试图修复我的 LibGDX 应用程序中的一个错误，一些 Android 用户报告说空格键会在他们的输入中插入“自动完成”字样。在某些情况下，软键盘甚至不显示自动完成建议。

据我所知，LibGDX 不使用“原生”Android UI 元素，因此 TextField 对象在点击时运行此代码:

public void setOnscreenKeyboardVisible (final boolean visible) {
        handle.post(new Runnable() {
            public void run () {
                InputMethodManager manager = (InputMethodManager)context.getSystemService(Context.INPUT_METHOD_SERVICE);
                if (visible) {
                    View view = ((AndroidGraphics)app.getGraphics()).getView();
                    view.setFocusable(true);
                    view.setFocusableInTouchMode(true);
                    manager.showSoftInput(view, 0);
                } else {
                    manager.hideSoftInputFromWindow(((AndroidGraphics)app.getGraphics()).getView().getWindowToken(), 0);
                }
            }
        });
    }

所以这里有一行显示键盘:

manager.showSoftInput(view, 0);

我如何设置一些标志或其他东西来告诉键盘禁用自动完成？

请注意，这只发生在某些用户身上，找不到模式。此外，到目前为止，仅限 Android 8 和 9。

Answer 1

我搜索了一下，发现这根本不是直截了当的。

您显示的 AndroidInput 中的方法使用 View app.getGraphics().getView() 来显示键盘。如 another answer 中所述，您需要对该 View 进行子类化并覆盖以下方法才能设置输入标志:

@Override
public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
    InputConnection connection =  super.onCreateInputConnection(outAttrs);
    // Set flags to disable suggestions. Visible password flag is only needed for some devices.
    outAttrs.inputType |= InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS 
            | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD;
    return connection;
}

除了 AndroidGraphics 使用的 View 不是特别容易子类化。相反，您可以子类化 AndroidInput 类并提供不同的输入 View 。这是一个示例启动器类:

class AndroidLauncher extends AndroidApplication {

    private View inputView;
    private Handler handle;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Config and init your game class.
        AndroidApplicationConfiguration config = new AndroidApplicationConfiguration();
        initialize(new MyGame(), config);

        // Custom view used for showing the keyboard.
        // Most of the code in onCreateInputConnection comes from the GLSurfaceView20 class.
        inputView = new View(this) {
            @Override
            public InputConnection onCreateInputConnection(EditorInfo outAttrs) {
                if (outAttrs != null) {
                    outAttrs.imeOptions |= EditorInfo.IME_FLAG_NO_EXTRACT_UI;
                    // This line is the only different from original source, it disables suggestions.
                    outAttrs.inputType |= InputType.TYPE_TEXT_FLAG_NO_SUGGESTIONS
                            | InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD;
                }

                return new BaseInputConnection(this, false) {
                    @Override
                    public boolean deleteSurroundingText (int beforeLength, int afterLength) {
                        int sdkVersion = android.os.Build.VERSION.SDK_INT;
                        if (sdkVersion >= 16) {
                            if (beforeLength == 1 && afterLength == 0) {
                                sendDownUpKeyEventForBackwardCompatibility(KeyEvent.KEYCODE_DEL);
                                return true;
                            }
                        }
                        return super.deleteSurroundingText(beforeLength, afterLength);
                    }

                    @TargetApi(16)
                    private void sendDownUpKeyEventForBackwardCompatibility (final int code) {
                        final long eventTime = SystemClock.uptimeMillis();
                        super.sendKeyEvent(new KeyEvent(eventTime, eventTime, KeyEvent.ACTION_DOWN, code, 0, 0,
                                KeyCharacterMap.VIRTUAL_KEYBOARD, 0, KeyEvent.FLAG_SOFT_KEYBOARD | KeyEvent.FLAG_KEEP_TOUCH_MODE));
                        super.sendKeyEvent(new KeyEvent(SystemClock.uptimeMillis(), eventTime, KeyEvent.ACTION_UP, code, 0, 0,
                                KeyCharacterMap.VIRTUAL_KEYBOARD, 0, KeyEvent.FLAG_SOFT_KEYBOARD | KeyEvent.FLAG_KEEP_TOUCH_MODE));
                    }
                };
            }
        };
        handle = new Handler();  // handle is private in AndroidInput so we create our own.

        // Android has two different AndroidInput classes depending on SDK versions, create the right one. You can remove one of them if you don't support API < 12.
        if (Build.VERSION.PREVIEW_SDK_INT >= 12) {
           input = new AndroidInputThreePlus(this, this, graphics.getView(), config) {
               @Override
               public void setOnscreenKeyboardVisible(boolean visible) {
                   AndroidLauncher.this.setOnscreenKeyboardVisible(visible);
               }
           };
        } else {
            input = new AndroidInput(this, this, graphics.getView(), config) {
                @Override
                public void setOnscreenKeyboardVisible(boolean visible) {
                    AndroidLauncher.this.setOnscreenKeyboardVisible(visible);
                }
            };
        }
    }

    private void setOnscreenKeyboardVisible(final boolean visible) {
        // Code comes from AndroidInput.setOnscreenKeyboardVisible except view is changed.
        handle.post(new Runnable() {
            public void run () {
                InputMethodManager manager = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                if (visible) {
                    inputView.setFocusable(true);
                    inputView.setFocusableInTouchMode(true);
                    manager.showSoftInput(inputView, 0);
                } else {
                    manager.hideSoftInputFromWindow(inputView.getWindowToken(), 0);
                }
            }
        });
    }
}

如您所见，这并不容易做到。我也没有测试过它，所以我可能会遗漏更多东西。

那时我宁愿建议您在 github 上提交问题并提出拉取请求。 android 图形 View 实现是 GLSurfaceView20(或 GLSurfaceView20API18)，它已经覆盖了 onCreateInputConnection。您可以在 Input 接口(interface)中添加一个选项来禁用建议，并在每个后端实现它。

如果您对此有任何疑问，请随时提出。