Android显示软键盘

public static void show(final EditText content){
    content.setFocusable(true);
    content.setFocusableInTouchMode(true);
    content.postDelayed(new Runnable() {
        @Override
        public void run() {
            InputMethodManager imm = (InputMethodManager) content.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
            if (imm != null) {
                content.requestFocus();
                imm.showSoftInput(content, 0);
            }
        }
    },200);
}