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

如果你想从你的活动中处理IMM(虚拟)键盘窗口的显示/隐藏，你需要子类化你的布局并覆盖onMesure方法(这样你就可以确定你的布局的测量宽度和测量高度)。之后，通过setContentView()将子类布局设置为Activity的主视图。现在您将能够处理IMM显示/隐藏窗口事件。也许这听起来很复杂，但事实并非如此。代码如下:

main。xml

   <?xml version="1.0" encoding="utf-8"?>
   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="horizontal" >
        <EditText
             android:id="@+id/SearchText" 
             android:text="" 
             android:inputType="text"
             android:layout_width="fill_parent"
             android:layout_height="34dip"
             android:singleLine="True"
             />
        <Button
             android:id="@+id/Search" 
             android:layout_width="60dip"
             android:layout_height="34dip"
             android:gravity = "center"
             />
    </LinearLayout>

现在在布局的Activity声明子类中(main.xml)

    public class MainSearchLayout extends LinearLayout {

    public MainSearchLayout(Context context, AttributeSet attributeSet) {
        super(context, attributeSet);
        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        inflater.inflate(R.layout.main, this);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        Log.d("Search Layout", "Handling Keyboard Window shown");

        final int proposedheight = MeasureSpec.getSize(heightMeasureSpec);
        final int actualHeight = getHeight();

        if (actualHeight > proposedheight){
            // Keyboard is shown

        } else {
            // Keyboard is hidden
        }
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    }
}

您可以从代码中看到，我们在子类构造函数中为Activity扩展布局

inflater.inflate(R.layout.main, this);

现在只需设置Activity的子类布局的内容视图。

public class MainActivity extends Activity {

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        MainSearchLayout searchLayout = new MainSearchLayout(this, null);

        setContentView(searchLayout);
    }

    // rest of the Activity code and subclassed layout...

}

2020年更新

这现在是可能的:

在Android 11上，你可以这样做

view.setWindowInsetsAnimationCallback(object : WindowInsetsAnimation.Callback {
    override fun onEnd(animation: WindowInsetsAnimation) {
        super.onEnd(animation)
        val showingKeyboard = view.rootWindowInsets.isVisible(WindowInsets.Type.ime())
        // now use the boolean for something
    }
})

你也可以听显示/隐藏键盘的动画，并做相应的转换。

我建议阅读Android 11预览版和相应的文档

Android 11之前

但是，这项工作还没有Compat版本，所以您需要求助于黑客。

你可以得到窗口的insets，如果底部的insets大于一些值，你认为是合理的(通过实验)，你可以认为这是显示键盘。这不是很好，在某些情况下可能会失败，但没有框架支持这一点。

这是对这个确切问题的一个很好的回答https://stackoverflow.com/a/36259261/372076。或者，这里有一个页面给出了一些不同的方法来实现这个在Android 11之前:

https://developer.salesforce.com/docs/atlas.en-us.noversion.service_sdk_android.meta/service_sdk_android/android_detecting_keyboard.htm

Note

此解决方案不适用于软键盘和 onConfigurationChanged将不会被soft (virtual)调用 键盘。

您必须自己处理配置更改。

http://developer.android.com/guide/topics/resources/runtime-changes.html#HandlingTheChange

示例:

// from the link above
@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);

    
    // Checks whether a hardware keyboard is available
    if (newConfig.hardKeyboardHidden == Configuration.HARDKEYBOARDHIDDEN_NO) {
        Toast.makeText(this, "keyboard visible", Toast.LENGTH_SHORT).show();
    } else if (newConfig.hardKeyboardHidden == Configuration.HARDKEYBOARDHIDDEN_YES) {
        Toast.makeText(this, "keyboard hidden", Toast.LENGTH_SHORT).show();
    }
}

然后只需更改一些视图的可见性，更新字段，并更改布局文件。

桑德，我相信你是想展示被软键盘挡住的视野。试试这个http://android-developers.blogspot.com/2009/04/updating-applications-for-on-screen.html。

我是这样做的:

添加OnKeyboardVisibilityListener接口。

public interface OnKeyboardVisibilityListener {
    void onVisibilityChanged(boolean visible);
}

HomeActivity.java:

public class HomeActivity extends Activity implements OnKeyboardVisibilityListener {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_sign_up);
    // Other stuff...
    setKeyboardVisibilityListener(this);
}

private void setKeyboardVisibilityListener(final OnKeyboardVisibilityListener onKeyboardVisibilityListener) {
    final View parentView = ((ViewGroup) findViewById(android.R.id.content)).getChildAt(0);
    parentView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

        private boolean alreadyOpen;
        private final int defaultKeyboardHeightDP = 100;
        private final int EstimatedKeyboardDP = defaultKeyboardHeightDP + (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? 48 : 0);
        private final Rect rect = new Rect();

        @Override
        public void onGlobalLayout() {
            int estimatedKeyboardHeight = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, EstimatedKeyboardDP, parentView.getResources().getDisplayMetrics());
            parentView.getWindowVisibleDisplayFrame(rect);
            int heightDiff = parentView.getRootView().getHeight() - (rect.bottom - rect.top);
            boolean isShown = heightDiff >= estimatedKeyboardHeight;

            if (isShown == alreadyOpen) {
                Log.i("Keyboard state", "Ignoring global layout change...");
                return;
            }
            alreadyOpen = isShown;
            onKeyboardVisibilityListener.onVisibilityChanged(isShown);
        }
    });
}


@Override
public void onVisibilityChanged(boolean visible) {
    Toast.makeText(HomeActivity.this, visible ? "Keyboard is active" : "Keyboard is Inactive", Toast.LENGTH_SHORT).show();
  }
}

希望这对你有所帮助。

就像@amalBit的答案一样，注册一个全局布局的监听器，并计算dectorView的可见底部和建议底部的差值，如果差值大于某个值(猜测IME的高度)，我们认为IME是up的:

    final EditText edit = (EditText) findViewById(R.id.edittext);
    edit.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            if (keyboardShown(edit.getRootView())) {
                Log.d("keyboard", "keyboard UP");
            } else {
                Log.d("keyboard", "keyboard Down");
            }
        }
    });

private boolean keyboardShown(View rootView) {

    final int softKeyboardHeight = 100;
    Rect r = new Rect();
    rootView.getWindowVisibleDisplayFrame(r);
    DisplayMetrics dm = rootView.getResources().getDisplayMetrics();
    int heightDiff = rootView.getBottom() - r.bottom;
    return heightDiff > softKeyboardHeight * dm.density;
}

高度阈值100是IME猜测的最小高度。

这适用于adjustPan和adjuststresize。