AutoCompleteTextView自动补全文本框

AutoCompleteTextView的作用是在输入框中输入我们想要输入的信息，就会出现其他与其相关的提示信息

下面是实例代码：

MainActivity.java

package com.shaoxin.myautocompletetextview;

import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.CursorAdapter;
import android.widget.TextView;

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

public class MainActivity extends AppCompatActivity {
    private AutoCompleteTextView autoCompleteTextView;
    private String[] strings = {"aaa", "aabb", "aabc"};
    private ArrayAdapter arrayAdapter;
    private ContentResolver contentResolver;
    private List list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //自动补全文本框
        autoCompleteTextView = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView);
        //内容解析器
        contentResolver = getContentResolver();
        list = new ArrayList();
        //光标接受内容解析器所解析的内容，调用电话薄，记住要加权限
        Cursor cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, new String[]{"_id", "data1", "display_name"},
                null, null, null);
        //光标下移，将指向的内容存入集合当中
        while (cursor.moveToNext()) {
            String string = cursor.getString(1);
            list.add(string);
        }
        //        arrayAdapter = new ArrayAdapter(MainActivity.this, android.R.layout.simple_list_item_1, list);
        //        autoCompleteTextView.setAdapter(arrayAdapter);
        MyAdapter myAdapter = new MyAdapter(MainActivity.this, cursor);
        autoCompleteTextView.setAdapter(myAdapter);
    }
    //自定义适配器，继承光标适配器
    class MyAdapter extends CursorAdapter {

        MyAdapter(Context context, Cursor c) {
            super(context, c);
        }

        @Override
        public View newView(Context context, Cursor cursor, ViewGroup parent) {
            //视图填充
            View view = View.inflate(MainActivity.this, R.layout.auto_view, null);
            return view;
        }

        @Override
        public void bindView(View view, Context context, Cursor cursor) {
            TextView textView = (TextView) view.findViewById(R.id.txt);
            textView.setText(cursor.getString(1));

        }
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.shaoxin.myautocompletetextview.MainActivity">

    <AutoCompleteTextView
        android:id="@+id/autoCompleteTextView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:completionThreshold="1"
        android:text="请输入内容" />
</RelativeLayout>

auto_view.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher" />

    <TextView
        android:id="@+id/txt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

将代码直接导入运行即可