我解决这个问题通过覆盖onkeyprime (int keyCode, KeyEvent事件)在我的自定义EditText。

@Override
public boolean onKeyPreIme(int keyCode, KeyEvent event) {
    if (keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_UP) {
        //keyboard will be hidden
    }
}

尽管本页上投票最多的解决方案说，有一个setWindowInsetsAnimationCallback的ViewCompat版本一直工作到Android 21。

所以现在，这个解决方案的方法一直适用于21。

来源:https://developer.android.com/reference/androidx/core/view/ViewCompat setWindowInsetsAnimationCallback (android.view.View androidx.core.view.WindowInsetsAnimationCompat.Callback)

我所做的是创建一个简单的绑定来隐藏视图时，键盘是可见的。 解决方案基于当前AndroidX实现的WindowInsetsCompat，仍处于beta (AndroidX核心1.5)-源代码

private fun isKeyboardVisible(insets: WindowInsets): Boolean {
    val insetsCompat = WindowInsetsCompat.toWindowInsetsCompat(insets)
    val systemWindow = insetsCompat.systemWindowInsets
    val rootStable = insetsCompat.stableInsets
    if (systemWindow.bottom > rootStable.bottom) {
        // This handles the adjustResize case on < API 30, since
        // systemWindow.bottom is probably going to be the IME
        return true
    }
    return false
}

@BindingAdapter("goneWhenKeyboardVisible")
fun View.goneWhenKeyboardVisible(enabled: Boolean) {
    if (enabled) {
        setOnApplyWindowInsetsListener { view, insets ->
            visibility = if (isKeyboardVisible(insets)) GONE else VISIBLE
            insets
        }
    } else {
        setOnApplyWindowInsetsListener(null)
        visibility = VISIBLE
    }
}

用法:

<FrameLayout
                android:id="@+id/bottom_toolbar"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                app:goneWhenKeyboardVisible="@{true}"
                />

你也可以检查第一个DecorView的子底部填充。当键盘显示时，它将被设置为非零值。

@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
    View view = getRootView();
    if (view != null && (view = ((ViewGroup) view).getChildAt(0)) != null) {
        setKeyboardVisible(view.getPaddingBottom() > 0);
    }
    super.onLayout(changed, left, top, right, bottom);
}

使用viewTreeObserver轻松获取键盘事件。

layout_parent.viewTreeObserver.addOnGlobalLayoutListener {
            val r = Rect()
            layout_parent.getWindowVisibleDisplayFrame(r)
            if (layout_parent.rootView.height - (r.bottom - r.top) > 100) { // if more than 100 pixels, its probably a keyboard...
                Log.e("TAG:", "keyboard open")
            } else {
                Log.e("TAG:", "keyboard close")
            }
        }

** layout_parent是你的视图，比如edit_text.parent

基于Nebojsa Tomcic的代码，我开发了以下relativelayout子类:

import java.util.ArrayList;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.RelativeLayout;

public class KeyboardDetectorRelativeLayout extends RelativeLayout {

    public interface IKeyboardChanged {
        void onKeyboardShown();
        void onKeyboardHidden();
    }

    private ArrayList<IKeyboardChanged> keyboardListener = new ArrayList<IKeyboardChanged>();

    public KeyboardDetectorRelativeLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public KeyboardDetectorRelativeLayout(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public KeyboardDetectorRelativeLayout(Context context) {
        super(context);
    }

    public void addKeyboardStateChangedListener(IKeyboardChanged listener) {
        keyboardListener.add(listener);
    }

    public void removeKeyboardStateChangedListener(IKeyboardChanged listener) {
        keyboardListener.remove(listener);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        final int proposedheight = MeasureSpec.getSize(heightMeasureSpec);
        final int actualHeight = getHeight();

        if (actualHeight > proposedheight) {
            notifyKeyboardShown();
        } else if (actualHeight < proposedheight) {
            notifyKeyboardHidden();
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }

    private void notifyKeyboardHidden() {
        for (IKeyboardChanged listener : keyboardListener) {
            listener.onKeyboardHidden();
        }
    }

    private void notifyKeyboardShown() {
        for (IKeyboardChanged listener : keyboardListener) {
            listener.onKeyboardShown();
        }
    }

}

这工作得很好… 注意，当你的活动的软输入模式设置为" windowmanager . layoutparm . soft_input_adjust_resize "时，这个解决方案才会工作