AutoCompleteTextView的学习

简单使用AutoCompleteTextView

mainactivity.java

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.WindowManager;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

public class MainActivity extends AppCompatActivity {

    private static final String[] books = new String[]{
            "Android项目实战", "Python项目实战", "Android基础入门", "Java项目实战", "微信小程序项目实战"
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        getWindow()
                .setFlags(
                        WindowManager.LayoutParams.FLAG_FULLSCREEN,
                        WindowManager.LayoutParams.FLAG_FULLSCREEN
                );
        AutoCompleteTextView autocompleteTextView = (AutoCompleteTextView) findViewById(R.id.autocompleteTextView);

        ArrayAdapter<String> adapter = new ArrayAdapter<>(
                this,
                android.R.layout.simple_dropdown_item_1line,
                books);
        autocompleteTextView.setAdapter(adapter);
    }
}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".MainActivity">

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

    <AutoCompleteTextView
        android:id="@+id/autocompleteTextView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:dropDownWidth="match_parent"
        android:layout_toRightOf="@id/piccc"
        android:hint="请输入关键字" />

</RelativeLayout>

从数据库中查询