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KeyboardUtils

KeyBoardShowListener  

重点是 KeyBoardShowListener    

拿来主义者而已，分享一下，同时也怕自己忘记走弯路.

public class KeyBoardShowListener {
    private Context ctx;

    public KeyBoardShowListener(Context ctx) {
        this.ctx = ctx;
    }

    OnKeyboardVisibilityListener keyboardListener;

    public OnKeyboardVisibilityListener getKeyboardListener() {
        return keyboardListener;
    }

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

    public void setKeyboardListener(final OnKeyboardVisibilityListener listener, Activity activity) {
        final View activityRootView = ((ViewGroup) activity.findViewById(android.R.id.content)).getChildAt(0);
        activityRootView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {

            private boolean wasOpened;

            private final int DefaultKeyboardDP = 100;

            // From @nathanielwolf answer... Lollipop includes button bar in the root. Add height of button bar (48dp) to maxDiff
            private final int EstimatedKeyboardDP = DefaultKeyboardDP + (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP ? 48 : 0);

            private final Rect r = new Rect();

            @Override
            public void onGlobalLayout() {
                // Convert the dp to pixels.
                int estimatedKeyboardHeight = (int) TypedValue
                        .applyDimension(TypedValue.COMPLEX_UNIT_DIP, EstimatedKeyboardDP, activityRootView.getResources().getDisplayMetrics());

                // Conclude whether the keyboard is shown or not.
                activityRootView.getWindowVisibleDisplayFrame(r);
                int heightDiff = activityRootView.getRootView().getHeight() - (r.bottom - r.top);
                boolean isShown = heightDiff >= estimatedKeyboardHeight;

                if (isShown == wasOpened) {
                    Log.e("Keyboard state", "Ignoring global layout change...");
                    return;
                }

                wasOpened = isShown;
                listener.onVisibilityChanged(isShown);
            }
        });
    }
}

public class KeyboardUtils {

    public static void hideKeyboard(Context context, EditText field) {
        InputMethodManager imm = (InputMethodManager) context.getSystemService(
                Context.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(field.getWindowToken(), 0);
    }

    public static void showDelayedKeyboard (Context context, View view) {
        showDelayedKeyboard(context, view, 100);
    }

    public static void showDelayedKeyboard (final Context context, final View view, final int delay) {
        new AsyncTask<Void, Void, Void>() {
            @Override
            protected Void doInBackground(Void... params) {
                try {
                    Thread.sleep(delay);
                } catch (InterruptedException e) {
                }

                return null;
            }

            @Override
            protected void onPostExecute(Void result) {
                InputMethodManager imm = (InputMethodManager) context.getSystemService(
                        Context.INPUT_METHOD_SERVICE);
                imm.showSoftInput(view, InputMethodManager.SHOW_IMPLICIT);
            }

        }.execute();
    }

    public static void showKeyboard (Context context, View view) {
        InputMethodManager imm = (InputMethodManager) context.getSystemService(
                Context.INPUT_METHOD_SERVICE);
        imm.showSoftInput(view, InputMethodManager.SHOW_IMPLICIT);
    }
}