AutoCompleteTextView的使用（EditText自动提示）

<?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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.smartsms.adolpher.myapplication.MainActivity">

<!-- 默认为2个字开始查询，改为1个字开始查询-->
<AutoCompleteTextView
android:id="@+id/autocomplete"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:completionThreshold="1"
/>

</RelativeLayout>

<?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"
android:padding="5dp"
>
<TextView
android:id="@+id/tv_item_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="名字"
android:textSize="20sp"
/>
<TextView
android:id="@+id/tv_item_number"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="134321"
android:textSize="18sp"
/>

</LinearLayout>

package com.smartsms.adolpher.myapplication;

import android.database.Cursor;
import android.provider.ContactsContract;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.AutoCompleteTextView;
import android.widget.FilterQueryProvider;
import android.widget.ListView;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

AutoCompleteTextView autocomplete = (AutoCompleteTextView) findViewById(R.id.autocomplete);
//创建adapter，最后一个参数为cursor，先为null，后期重新赋值
TestAdapter adapter = new TestAdapter(this, null);
//设置adapter
autocomplete.setAdapter(adapter);
//设置实时查询
adapter.setFilterQueryProvider(new FilterQueryProvider() {
@Override
public Cursor runQuery(CharSequence constraint) {
//constraint就是实时输入的东西
//拿这个东西和数据库中的数据匹配

//查询字段
String[] projection = {
"_id",
"display_name",
"data1"
};
//模糊查询
String selection = "data1 like '%" + constraint + "%'";
Cursor cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, projection, selection, null, null);

//把cursor替换原来的cursor
return cursor;
}
});

}
}

package com.smartsms.adolpher.myapplication;

import android.content.Context;
import android.database.Cursor;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorAdapter;
import android.widget.TextView;

public class TestAdapter extends CursorAdapter {

public TestAdapter(Context context, Cursor c) {
super(context, c);
}

//条目
@Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
return View.inflate(context, R.layout.item, null);
}
//条目中的数据
@Override
public void bindView(View view, Context context, Cursor cursor) {
ViewHolder holder = getHolder(view);
holder.tv_item_name.setText(cursor.getString(cursor.getColumnIndex("display_name")));
holder.tv_item_number.setText(cursor.getString(cursor.getColumnIndex("data1")));
}

private ViewHolder getHolder(View view){
ViewHolder holder = (ViewHolder) view.getTag();
if(holder == null){
holder = new ViewHolder(view);
view.setTag(holder);
}
return holder;
}
//条目优化
class ViewHolder{
public TextView tv_item_name;
public TextView tv_item_number;
public ViewHolder(View v){
tv_item_name = (TextView) v.findViewById(R.id.tv_item_name);
tv_item_number = (TextView) v.findViewById(R.id.tv_item_number);
}

}

}

<uses-permission android:name="android.permission.READ_CONTACTS"/>