首先在页面中添加一个AutoCompleteTextView组件,属性代表输入几个字符开始匹配
android:completionThreshold="3"
<AutoCompleteTextView
android:id="@+id/a1"
android:completionThreshold="3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="请输入要搜索的关键词"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.5"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@id/button3"
android:layout_marginTop="60dp"/>
1.初始化变量 2.需要一个适配器 3.初始化数据源---数据源去匹配文本框中输入的内容 4.adpter与当前的autoCompleteTextView绑定
package com.example.administrator.myapplication;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements View.OnClickListener{
private AutoCompleteTextView autoCompleteTextView;
private String[] res={"beijing1","beijing2","beijing3",
"shanghai1","shanghai2"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
autoCompleteTextView=(AutoCompleteTextView)findViewById(R.id.a1);
/*
* 1.初始化变量
* 2.需要一个适配器
* 3.初始化数据源---数据源去匹配文本框中输入的内容
* */
ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,
android.R.layout.simple_expandable_list_item_1,res);
autoCompleteTextView.setAdapter(adapter);
}
}