Editext禁止输入Emoji表情

Editext禁止输入Emoji表情

直接内部类使用用一个监听搞定

package com.warden.snsemoji;  

import android.os.Bundle;  
import android.support.v7.app.AppCompatActivity;  
import android.text.Editable;  
import android.text.TextWatcher;  
import android.util.Log;  
import android.widget.EditText;  
import android.widget.Toast;  

public class MainActivity extends AppCompatActivity  
{  
    private static final String TAG = "warden";  
    private EditText mainEt;  

    @Override  
    protected void onCreate(Bundle savedInstanceState)  
    {  
        super.onCreate(savedInstanceState);  

        setContentView(R.layout.activity_main);  

        mainEt = (EditText) findViewById(R.id.main_et);  
        mainEt.addTextChangedListener(new TextChange(mainEt));  
    }  


    private class TextChange implements TextWatcher  
    {  
        private EditText et;  

        public TextChange(EditText et)  
        {  
            this.et = et;  
        }  

        @Override  
        public void beforeTextChanged(CharSequence s, int start, int count, int after)  
        {  
            // i("s:" + s);  

        }  

        @Override  
        public void onTextChanged(CharSequence s, int start, int before, int count)  
        {  
            // e("s:" + s + "  start:" + start + " before:" + before + " count:" + count);  
            //输入的类容  
            CharSequence input = s.subSequence(start, start + count);  
            //e("输入信息:" + input);  
            // 退格  
            if (count == 0) return;  

            //如果 输入的类容包含有Emoji  
            if (isEmojiCharacter(input))  
            {  
                show("not input emoji");  
                //那么就去掉  
                et.setText(removeEmoji(s));  
            }  

            //如果输入的字符超过最大限制,超出的部分 砍掉~  
            if (s.length() > 3)  
            {  
                show("超过输入的最大限制");  
                et.setText(s.subSequence(0, start));  
            }  
            //最后光标移动到最后 TODO 这里可能会有更好的解决方案  
            et.setSelection(et.getText().toString().length());  

        }  

        @Override  
        public void afterTextChanged(Editable s)  
        {  
            // d("s:" + s);  
        }  
    }  

    /** 
     * 去除字符串中的Emoji表情 
     * @param source 
     * @return 
     */  
    private String removeEmoji(CharSequence source)  
    {  
        String result = "";  
        for (int i = 0; i < source.length(); i++)  
        {  
            char c = source.charAt(i);  
            if (isEmojiCharacter(c))  
            {  
                continue;  
            }  
            result += c;  
        }  
        return result;  
    }  



    /** 
     * 判断一个字符串中是否包含有Emoji表情 
     * @param input 
     * @return true 有Emoji 
     */  
    private boolean isEmojiCharacter(CharSequence input)  
    {  
        for (int i = 0; i < input.length(); i++)  
        {  
            if (isEmojiCharacter(input.charAt(i)))  
            {  
                return true;  
            }  
        }  
        return false;  
    }  

    /** 
     * 是否是Emoji 表情,抄的那哥们的代码 
     * 
     * @param codePoint 
     * @return true 是Emoji表情 
     */  
    public static boolean isEmojiCharacter(char codePoint)  
    {  
        // Emoji 范围  
        boolean isScopeOf = (codePoint == 0x0) || (codePoint == 0x9) || (codePoint == 0xA) || (codePoint == 0xD)  
                || ((codePoint >= 0x20) && (codePoint <= 0xD7FF) && (codePoint != 0x263a))  
                || ((codePoint >= 0xE000) && (codePoint <= 0xFFFD))  
                || ((codePoint >= 0x10000) && (codePoint <= 0x10FFFF));  

        return !isScopeOf;  
    }  

    private void show(String msg)  
    {  
        Toast.makeText(MainActivity.this, msg, Toast.LENGTH_SHORT).show();  
    }  

    void e(String msg)  
    {  
        Log.e(TAG, msg);  
    }  

    void i(String msg)  
    {  
        Log.i(TAG, msg);  
    }  

    void d(String msg)  
    {  
        Log.d(TAG, msg);  
    }  
}