Android监听软键盘

SoftKeyboardMonitor.java

// https://stackoverflow.com/questions/25216749/softkeyboard-open-and-close-listener-in-an-activity-in-android
public class SoftKeyboardMonitor {

    private final BaseActivity mActivity;
    private KeyboardListener mKeyboardListener;
    private View rootLayout;

    private boolean isOpened;

    public SoftKeyboardMonitor(BaseActivity activity) {
        mActivity = activity;
        if (activity instanceof KeyboardListener) {
            mKeyboardListener = (KeyboardListener) activity;
        }
    }

    public void attach(View view) {
        detach();

        rootLayout = view;
        rootLayout.getViewTreeObserver().addOnGlobalLayoutListener(keyboardLayoutListener);
    }

    public void detach() {
        if (rootLayout != null) {
            removeGlobalOnLayoutListenerCompact(rootLayout.getViewTreeObserver(), keyboardLayoutListener);
            rootLayout = null;
        }
    }

    private ViewTreeObserver.OnGlobalLayoutListener keyboardLayoutListener = new ViewTreeObserver.OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {

            if (mActivity.isActivityDestroyed()) {
                return;
            }

            int heightDiff = rootLayout.getRootView().getHeight() - rootLayout.getHeight();
            int contentViewTop = mActivity.getWindow().findViewById(Window.ID_ANDROID_CONTENT).getTop();

            if (rootLayout.getHeight() > 2 * SystemUtils.getScreenHeight(mActivity) / 3) {
                if (mKeyboardListener != null) mKeyboardListener.onHideKeyboard();
                isOpened = false;
            } else {
                Log.i("SoftKeyboardMonitor", "onGlobalLayout: ");
                int keyboardHeight = heightDiff - contentViewTop;
                if (!isOpened) {
                    if (mKeyboardListener != null) mKeyboardListener.onShowKeyboard(keyboardHeight);
                }
                isOpened = true;
            }
        }
    };

    private void removeGlobalOnLayoutListenerCompact(ViewTreeObserver observer, ViewTreeObserver.OnGlobalLayoutListener listener) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            observer.removeOnGlobalLayoutListener(listener);
        } else {
            observer.removeGlobalOnLayoutListener(listener);
        }
    }

    public interface KeyboardListener {
        void onHideKeyboard();

        void onShowKeyboard(int height);
    }

}