android 中 EditText使用技巧汇总

android 中使用EditText的场景还是比较丰富的，无论是是直接使用android提供的原生控件，还是通过自己重新自定义的EditText，因此想记录一下我在真实项目中用过的它的一些使用技巧，后面会持续更新！（PS：有部分代码来自参考文章）

1、让软键盘出现搜索按钮

image.png image.png

• 核心代码块1：这俩个一定要设置，要不然软键盘不会出现搜索

                android:imeOptions="actionSearch"
                android:singleLine="true"

• 核心代码块2：Activity或者Fragment 要实现TextView.OnEditorActionListener接口

public class DrugCatalogueInquiryFragment extends GeneralSocialFragment implements TextView.OnEditorActionListener {

 private ClearEditText etDrugName;

 etDrugName = xFindViewById(R.id.et_drug_name);
 etDrugName.setOnEditorActionListener(this);

  @Override
    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
        doWhichOperation(actionId);
        return true;
    }

    private void doWhichOperation(int actionId) {
        switch (actionId) {
            case EditorInfo.IME_ACTION_SEARCH:
                //隐藏项目中弹框
                hideSoftInputMethod();
                
                //项目中个性化操作
                getEditTextValue();
                pageno = 1;
                getMedicineListInfoForApp(name,firstWord,type,level,pageno);
                break;
            default:
                break;
        }
    }

}

2、通过监听OnFocusChangeListener判断EditText的焦点与否

    private void initListener(){
        etDrugName.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View view, boolean b) {
                if (b){
                    TypeUtils.getInstance( getActivity() ).hideKeyboardView();
                }
            }
        });

        etDrugNameOfInitial.setOnFocusChangeListener(new View.OnFocusChangeListener() {
            @Override
            public void onFocusChange(View view, boolean b) {
                if (b){
                    TypeUtils.getInstance( getActivity() ).hideKeyboardView();
                }
            }
        });
    }

3、通过属性android:inputType来限制EditText输入的类型

 android:inputType="number"

image.png

4、通过属性android:digits来规定只能输入的值

 android:digits="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"

5、通过属性android:ellipsize来对文本内容的呈现做说明

 android:ellipsize="end"

image.png

6、规定只能输入中文

  /**
     * 通过使用Android源码中的InputFilter接口
     */
    InputFilter filter = new InputFilter() {
        public CharSequence filter(CharSequence source, int start, int end,
                                   Spanned dest, int dstart, int dend) {
            for (int i = start; i < end; i++) {
                if (!isChinese(source.charAt(i))) {
                    return "";
                }
            }
            return null;
        }
    };

    /**
     * 判定输入汉字
     *
     * @param c
     * @return
     */
    public static boolean isChinese(char c) {
        Character.UnicodeBlock ub = Character.UnicodeBlock.of(c);
        if (ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_COMPATIBILITY_IDEOGRAPHS
                || ub == Character.UnicodeBlock.CJK_UNIFIED_IDEOGRAPHS_EXTENSION_A
                || ub == Character.UnicodeBlock.GENERAL_PUNCTUATION
                || ub == Character.UnicodeBlock.CJK_SYMBOLS_AND_PUNCTUATION
                || ub == Character.UnicodeBlock.HALFWIDTH_AND_FULLWIDTH_FORMS) {
            return true;
        }
        return false;
    }

        etDrugName.setFilters(new InputFilter[]{filter});

        //如果想要再实现输入字符数量的限制，可以这么写,如果限制字符数为6，就在LengthFilter中传入参数6
//        etDrugName.setFilters(new InputFilter[]{filter, new InputFilter.LengthFilter(6)});

7、只能输入英文字母并且EditText在显示的时候会自动转化为大写

android:digits="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"

//首先是小写转大写的方法
public class UpperCaseTransform extends ReplacementTransformationMethod {
    @Override
    protected char[] getOriginal() {
        char[] aa = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z'};
        return aa;
    }

    @Override
    protected char[] getReplacement() {
        char[] cc = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};
        return cc;
    }
}

//然后是设置
editText.setTransformationMethod(new UpperCaseTransform());

8、软键盘和自定义键盘（弹框）互斥出现

    /**
     * 隐藏软件盘
     */
    private void hideSoftInputMethod(){
        InputMethodManager inputMethodManager = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
        if (inputMethodManager.isActive()){
            LogUtil.d(TAG,"软键盘打开了，准备关闭=================");
            inputMethodManager.hideSoftInputFromWindow(getActivity().getCurrentFocus().getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
        }
    }

参考文章

https://blog.csdn.net/lx_asymmetric/article/details/53838165

https://blog.csdn.net/myth13141314/article/details/78124068

https://blog.csdn.net/h7870181/article/details/8332991

https://blog.csdn.net/jyz_2015/article/details/51543318

https://blog.csdn.net/afei__/article/details/51589302