邮箱联想

布局
<LinearLayout
    android:orientation="vertical"
    android:layout_marginTop="50dp"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
    <AutoCompleteTextView
        android:id="@+id/autoComplete"
        android:layout_width="match_parent"
        android:layout_height="66dp" />

    <test.com.mp3.MailBoxAssociateView
        android:id="@+id/imageviewedittextone"
        android:layout_width="match_parent"
        android:layout_height="58dp"
        android:layout_marginBottom="8dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:hint="地址"
        android:paddingLeft="5dp"
        android:popupBackground="@android:color/darker_gray"
        android:singleLine="true"
        android:textColor="@android:color/black"
        android:textColorHint="@android:color/holo_blue_bright"
        android:textSize="16sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/autoComplete" />

</LinearLayout>

 自定义 MailBoxAssociateView

package test.com.mp3;

import android.content.Context;
import android.util.AttributeSet;

/**
 * Created by T_baby on 17/12/25.
 * @后进行提示
 */

public class MailBoxAssociateView extends android.support.v7.widget.AppCompatMultiAutoCompleteTextView {
    public MailBoxAssociateView(Context context) {
        super(context);
    }

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

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

    @Override
    public boolean enoughToFilter() {
        // 如果字符中包含'@'并且不在第一位，则满足条件
        return getText().toString().contains("@") && getText().toString().indexOf("@") > 0;
    }
}

类 MailBoxAssociate tokenizer

package test.com.mp3;

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

/**
 * Created by T_baby on 17/12/25.
 */

public class MailBoxAssociateTokenizer 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;
            }
        }
    }

}

类 Autocompale

package test.com.mp3;

import android.content.Context;
import android.graphics.Color;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AutoCompleteTextView;
import android.widget.BaseAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by T_baby on 17/12/25.
 * 自动提示
 */

public class AutoComplete extends AutoCompleteTextView {
    //输入字符进行联想，@163.com、@126.com、@qq.com、@sina.com、@yeah.net、@yahoo.com、@gmail.com等常用邮箱
    private static final String[] emailSuffix = {"@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"};

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

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

    private void init(Context context) {
        final MyAdatper adapter = new MyAdatper(context);
        setAdapter(adapter);
        addTextChangedListener(new TextWatcher() {
            @Override
            public void afterTextChanged(Editable s) {
                String input = s.toString();
                adapter.mList.clear();
                if (input.length() > 0) {
                    for (int i = 0; i < emailSuffix.length; ++i) {
                        adapter.mList.add(input + emailSuffix[i]);
                    }
                }
                adapter.notifyDataSetChanged();
                showDropDown();
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,
                                          int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before,
                                      int count) {
            }
        });
        // default=2 当输入一个字符的时候就开始检测
        setThreshold(1);
    }

    class MyAdatper extends BaseAdapter implements Filterable {
        List<String> mList;
        private Context mContext;
        private MyFilter mFilter;

        public MyAdatper(Context context) {
            mContext = context;
            mList = new ArrayList<String>();
        }

        @Override
        public int getCount() {
            return mList == null ? 0 : mList.size();
        }

        @Override
        public Object getItem(int position) {
            return mList == null ? null : mList.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            if (convertView == null) {
                TextView tv = new TextView(mContext);
                tv.setTextColor(Color.BLACK);
                tv.setTextSize(20);
                convertView = tv;
            }
            TextView txt = (TextView) convertView;
            txt.setText(mList.get(position));
            return txt;
        }

        @Override
        public Filter getFilter() {
            if (mFilter == null) {
                mFilter = new MyFilter();
            }
            return mFilter;
        }

        private class MyFilter extends Filter {

            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults results = new FilterResults();
                if (mList == null) {
                    mList = new ArrayList<String>();
                }
                results.values = mList;
                results.count = mList.size();
                return results;
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                if (results.count > 0) {
                    notifyDataSetChanged();
                } else {
                    notifyDataSetInvalidated();
                }
            }
        }
    }
}

MainActivity

MailBoxAssociateView view;
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"};

在onCreateview中

view = findViewById(R.id.imageviewedittextone); MailBoxAssociateTokenizer mailBoxAssociateTokenizer = new MailBoxAssociateTokenizer(); ArrayAdapter<String> adapter = new ArrayAdapter(this, android.R.layout.simple_dropdown_item_1line, email_sufixs); view.setAdapter(adapter); view.setTokenizer(mailBoxAssociateTokenizer);