Android 邮箱自动补全-MultiAutoCompleteTextView实现

因为项目需要，要写一个邮箱自动补全的EditText，刚开始考虑使用AutoCompleteTextView来实现，但是满足不到需求官方组件太low了。。。

先来介绍下AutoCompleteTextView 的使用：
Activity

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

public class MainActivity extends AppCompatActivity {
    private static final String[] COUNTRIES = new String[]{
            "Belgium", "France", "Italy", "Germany", "Spain"
    };
    private AutoCompleteTextView mAutoCompleteTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mAutoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView);
        ArrayAdapter adapter = new ArrayAdapter(this,
                android.R.layout.simple_dropdown_item_1line, COUNTRIES);
        mAutoCompleteTextView.setAdapter(adapter);
    }

}

XML

使用方法很简单，获取到组件然后设置一个弹出的Adapter就能完成一个自动提示。

这里写图片描述

但是这个组件有几个特性不是很满足我们的需求。
1.默认是第二个字母开始匹配
2.整体内容匹配模式 Belgium 我们只能输入B ，Be，Bel等才会匹配
注：邮箱格式为[email protected]，整体内容肯定不行。

下面我们又看到一个MultiAutoCompleteTextView组件，来看下MultiAutoCompleteTextView能否满足我们的需求

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.MultiAutoCompleteTextView;

public class MainActivity extends AppCompatActivity {
    private static final String[] COUNTRIES = new String[]{
            "Belgium", "France", "Italy", "Germany", "Spain"
    };
    private AutoCompleteTextView mAutoCompleteTextView;
    private MultiAutoCompleteTextView mMultiAutoCompleteTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mAutoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView);
        mMultiAutoCompleteTextView = (MultiAutoCompleteTextView) findViewById(R.id.multiAutoCompleteTextView);

        ArrayAdapter adapter = new ArrayAdapter(this,
                android.R.layout.simple_dropdown_item_1line, COUNTRIES);

        mAutoCompleteTextView.setAdapter(adapter);

        mMultiAutoCompleteTextView.setAdapter(adapter);
        mMultiAutoCompleteTextView.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
    }

}

XML

这里写图片描述

Activity
经过查询API 我们知道 MultiAutoCompleteTextView 继承于 AutoCompleteTextView 继承于EditText

Android 邮箱自动补全-MultiAutoCompleteTextView实现_第1张图片

这里写图片描述

API中在MultiAutoCompleteTextView 提供了一个接口MultiAutoCompleteTextView.Tokenizer 可以用来匹配提示的子字符串。好吧，勉强能实现需求。
首先看MultiAutoCompleteTextView源码中有一个对Tokenizer接口的实现！然后换成我们的。

  /**
     * This simple Tokenizer can be used for lists where the items are
     * separated by a comma and one or more spaces.
     */
    public static class CommaTokenizer implements Tokenizer {
        public int findTokenStart(CharSequence text, int cursor) {
            int i = cursor;

            while (i > 0 && text.charAt(i - 1) != ',') {
                i--;
            }
            while (i < cursor && text.charAt(i) == ' ') {
                i++;
            }

            return i;
        }

        public int findTokenEnd(CharSequence text, int cursor) {
            int i = cursor;
            int len = text.length();

            while (i < len) {
                if (text.charAt(i) == ',') {
                    return i;
                } else {
                    i++;
                }
            }

            return len;
        }

        public CharSequence terminateToken(CharSequence text) {
            int i = text.length();

            while (i > 0 && text.charAt(i - 1) == ' ') {
                i--;
            }

            if (i > 0 && text.charAt(i - 1) == ',') {
                return text;
            } else {
                if (text instanceof Spanned) {
                    SpannableString sp = new SpannableString(text + ", ");
                    TextUtils.copySpansFrom((Spanned) text, 0, text.length(),
                                            Object.class, sp, 0);
                    return sp;
                } else {
                    return text + ", ";
                }
            }
        }
    }

根据MultiAutoCompleteTextView源码中的实现，我们知道Tokenizer的实现方式。

import android.text.SpannableString;
import android.text.Spanned;
import android.text.TextUtils;
import android.widget.MultiAutoCompleteTextView;

public class EmailAutoTokenizer implements MultiAutoCompleteTextView.Tokenizer {
    @Override
    public int findTokenEnd(CharSequence text, int cursor) {
        int i = cursor;
        int len = text.length();
        while (i < len) {
            if (text.charAt(i) == '@') {
                return i;
            } else {
                i++;
            }
        }
        return len;
    }

    @Override
    public int findTokenStart(CharSequence text, int cursor) {
        int index = text.toString().indexOf("@");

        if (index < 0) {
            index = text.length();
        }
        if (index >= findTokenEnd(text, cursor)) {
            index = 0;
        }
        return index;
    }

    @Override
    public CharSequence terminateToken(CharSequence text) {
        int i = text.length();

        while (i > 0 && text.charAt(i - 1) == ' ') {
            i--;
        }

        if (i > 0 && text.charAt(i - 1) == '@') {
            return text;
        } else {
            if (text instanceof Spanned) {
                SpannableString sp = new SpannableString(text);
                TextUtils.copySpansFrom((Spanned) text, 0, text.length(), Object.class, sp, 0);
                return sp;
            } else {
                return text;
            }
        }
    }
}

在Activity中把Tokenizer换成我们自己的看下效果 mMultiAutoCompleteTextView.setTokenizer(new EmailAutoTokenizer());

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.MultiAutoCompleteTextView;

public class MainActivity extends AppCompatActivity {
    private String[] email_sufixs = new String[]{"@qq.com", "@163.com", "@126.com", "@gmail.com", "@sina.com", "@hotmail.com",
            "@yahoo.cn", "@sohu.com", "@foxmail.com", "@139.com", "@yeah.net", "@vip.qq.com", "@vip.sina.com"};

    private AutoCompleteTextView mAutoCompleteTextView;
    private MultiAutoCompleteTextView mMultiAutoCompleteTextView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mAutoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView);
        mMultiAutoCompleteTextView = (MultiAutoCompleteTextView) findViewById(R.id.multiAutoCompleteTextView);

        ArrayAdapter adapter = new ArrayAdapter(this,
                android.R.layout.simple_dropdown_item_1line, email_sufixs);

        mAutoCompleteTextView.setAdapter(adapter);

        mMultiAutoCompleteTextView.setAdapter(adapter);
        mMultiAutoCompleteTextView.setTokenizer(new EmailAutoTokenizer());
    }
}

看下最后的效果图，当然我们还需要对弹出框进行调整下，自己去查询API吧！提供有方法。

这里写图片描述

正当我高兴的时候，万恶的产品Dog给我加一个右边删除效果，丢一个验证规则过来！

在@之后输入字母，从输入的字母开始suggest邮箱
点击suggest的邮箱，邮箱被输入到邮箱输入栏里，光标移动到下一text box
例：

输入：monoqn　→　不suggest

输入：monoqn@　→　不suggest

输入：monoqn@i　→　monoqn＠i.softbank.jp/[email protected]

输入：monoqn@ic　→　[email protected]

下面先验证规则：
1.在@之后输入字母，从输入的字母开始suggest邮箱。
很简单android:completionThreshold="2" 设置输入几个字符之后显示下拉菜单，默认为2个。不用管就行
2.点击suggest的邮箱，邮箱被输入到邮箱输入栏里，光标移动到下一text box
也简单MultiAutoCompleteTextView中有OnItemClickListener事件，

 email.setOnItemClickListener((parent, view1, position, id) -> password.requestFocus());

3.显示规则
看下了满足需求，666666！

最后一个右边加入删除按钮！本宝宝自定义一个就OK。

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextUtils;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.widget.MultiAutoCompleteTextView;

public class CleanableMultiAutoCompleteTextView extends MultiAutoCompleteTextView {
    private Drawable mRightDrawable;

    public CleanableMultiAutoCompleteTextView(Context context) {
        super(context);
        init();
    }

    public CleanableMultiAutoCompleteTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public CleanableMultiAutoCompleteTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }

    private void init() {
        // getCompoundDrawables:
        // Returns drawables for the left, top, right, and bottom borders.
        Drawable[] drawables = this.getCompoundDrawables();
        // get right drawable in layout.xml that is android:drawableRight
        mRightDrawable = drawables[2];
        setOnFocusChangeListener(new FocusChangeListenerImpl());
        addTextChangedListener(new TextWatcherImpl());
        setClearDrawableVisible(false);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        switch (event.getAction()) {
            case MotionEvent.ACTION_UP:
                boolean isClean = (event.getX() > (getWidth() - getTotalPaddingRight()))
                        && (event.getX() < (getWidth() - getPaddingRight()));
                if (isClean) {
                    setText("");
                }
                break;
        }
        return super.onTouchEvent(event);
    }

    private class FocusChangeListenerImpl implements OnFocusChangeListener {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if (hasFocus) {
                boolean isVisible = !TextUtils.isEmpty(getText());
                setClearDrawableVisible(isVisible);
            } else {
                setClearDrawableVisible(false);
            }
        }
    }

    private class TextWatcherImpl implements TextWatcher {
        @Override
        public void afterTextChanged(Editable s) {
            boolean isVisible = !TextUtils.isEmpty(getText());
            setClearDrawableVisible(isVisible);
        }

        @Override
        public void beforeTextChanged(CharSequence s, int start, int count,
                                      int after) {
            // no-op
        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before,
                                  int count) {
            // no-op
        }

    }

    public void setClearDrawableVisible(boolean isVisible) {
        Drawable rightDrawable = isVisible ? mRightDrawable : null;
        setCompoundDrawables(getCompoundDrawables()[0],
                getCompoundDrawables()[1], rightDrawable,
                getCompoundDrawables()[3]);
    }
}

这里写图片描述

有小伙伴需求是需要把输入的值放在@前面，感谢这位小伙伴的意见，后续我会把代码更新上来。

下载地址：https://github.com/liliLearn/AutoCompleteEmail-sample

Android 邮箱自动补全-MultiAutoCompleteTextView实现

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