Android实现实时搜索框功能

<?xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:app="http://schemas.android.com/apk/res-auto"  xmlns:tools="http://schemas.android.com/tools"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:context="com.amy.searchtest.MainActivity"> <LinearLayout  android:orientation="horizontal"  android:layout_width="fill_parent"  android:layout_height="fill_parent">   <AutoCompleteTextView  android:id="@+id/autoCompleteTextView1"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text=""  android:completionThreshold="2"  android:completionHint="请输入搜索内容..."  android:layout_weight="7"/>   <Button  android:id="@+id/button1"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="搜索"  android:layout_weight="1"  android:layout_marginLeft="10px"/>   </LinearLayout>  </android.support.constraint.ConstraintLayout>