安卓更改EditText下划线的颜色样式、动态获取输入的字数、设置焦点和软键盘

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在styles.xml文件中声明自定义样式

<style name="MyEditText" parent="Theme.AppCompat.Light"> 
    <item name="colorControlNormal">@color/indigo</item> 
    <item name="colorControlActivated">@color/pink</item>
</style>

 通过android：theme属性将此样式应用于您的EditText

<EditText 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:hint="Hint text" 
    android:theme="@style/MyEditText"/>

et_comment.addTextChangedListener(mTextWatcher);
        et_comment.setFocusable(true);
        et_comment.requestFocus();

动态获取输入的字数：

TextWatcher mTextWatcher = new TextWatcher() {
        private CharSequence temp;
        private int editStart;
        private int editEnd;

        @Override
        public void beforeTextChanged(CharSequence s, int arg1, int arg2,
                                      int arg3) {
            temp = s;
        }

        @Override
        public void onTextChanged(CharSequence s, int arg1, int arg2,
                                  int arg3) {
            if (s.length() <= 200) {
                word_remain.setText((200 - s.length()) + "/200");
            }
        }

        @Override
        public void afterTextChanged(Editable s) {
            editStart = et_comment.getSelectionStart();
            editEnd = et_comment.getSelectionEnd();
            if (temp.length() > 200) {
                ToastUtil.showToastShort("你输入的字数已经超过了限制!");

                s.delete(editStart - 1, editEnd);
                int tempSelection = editStart;
                et_comment.setText(s);
                et_comment.setSelection(tempSelection);
            }
        }
    };

设置焦点和软键盘：

/**
   * EditText获取焦点并显示软键盘
   */
  public static void showSoftInputFromWindow(Activity activity, EditText editText) {
    editText.setFocusable(true);
    editText.setFocusableInTouchMode(true);
    editText.requestFocus();
    activity.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
  }