android 键盘相关

hideSoftInput                : 动态隐藏软键盘
clickBlankArea2HideSoftInput : 点击屏幕空白区域隐藏软键盘(注释萌萌哒)
showSoftInput                : 动态显示软键盘
toggleSoftInput              : 切换键盘显示与否状态


public class KeyboardUtils {

    private KeyboardUtils() {
        throw new UnsupportedOperationException("u can't instantiate me...");
    }

    /**
     * 避免输入法面板遮挡
     * <p>在manifest.xml中activity中设置</p>
     * <p>android:windowSoftInputMode="adjustPan"</p>
     */

    /**
     * 动态隐藏软键盘
     *
     * @param activity activity
     */
    public static void hideSoftInput(Activity activity) {
        View view = activity.getCurrentFocus();
        if (view == null) {
            view = new View(activity);
        }
        InputMethodManager imm = (InputMethodManager) activity.getSystemService(Activity.INPUT_METHOD_SERVICE);
        imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
    }

    /**
     * 点击屏幕空白区域隐藏软键盘（方法2）
     * <p>根据EditText所在坐标和用户点击的坐标相对比，来判断是否隐藏键盘</p>
     * <p>需重写dispatchTouchEvent</p>
     * <p>参照以下注释代码</p>
     */
    public static void clickBlankArea2HideSoftInput() {
        Log.d("tips", "U should copy the following code.");
        /*
        @Override
        public boolean dispatchTouchEvent(MotionEvent ev) {
            if (ev.getAction() == MotionEvent.ACTION_DOWN) {
                View v = getCurrentFocus();
                if (isShouldHideKeyboard(v, ev)) {
                    InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
                    imm.hideSoftInputFromWindow(v.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
                }
            }
            return super.dispatchTouchEvent(ev);
        }

        // 根据EditText所在坐标和用户点击的坐标相对比，来判断是否隐藏键盘
        private boolean isShouldHideKeyboard(View v, MotionEvent event) {
            if (v != null && (v instanceof EditText)) {
                int[] l = {0, 0};
                v.getLocationInWindow(l);
                int left = l[0],
                        top = l[1],
                        bottom = top + v.getHeight(),
                        right = left + v.getWidth();
                return !(event.getX() > left && event.getX() < right
                        && event.getY() > top && event.getY() < bottom);
            }
            return false;
        }
        */
    }

    /**
     * 动态显示软键盘
     *
     * @param context 上下文
     * @param edit    输入框
     */
    public static void showSoftInput(Context context, EditText edit) {
        edit.setFocusable(true);
        edit.setFocusableInTouchMode(true);
        edit.requestFocus();
        InputMethodManager imm = (InputMethodManager) context
                .getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.showSoftInput(edit, 0);
    }

    /**
     * 切换键盘显示与否状态
     *
     * @param context 上下文
     */
    public static void toggleSoftInput(Context context) {
        InputMethodManager imm = (InputMethodManager) context
                .getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.toggleSoftInput(InputMethodManager.SHOW_FORCED, 0);
    }
}