andorid 如何构建autofill service和AutofillHints和setImportantForAutofill相关使用：

构建autofill service
对于在显示列表中的数据填充，需要app在继承AutofillService时，在重写onFillRequest()数据请求时进行数据装在载，这里指对onFillRequest做一些解释；

public class MyAutofillService extends AutofillService{
.....
@Override
public void onFillRequest(FillRequest request, CancellationSignal cancellationSignal,
        FillCallback callback) {
    //创建数据集；
    FillResponse.Builder response = new FillResponse.Builder();
    for (int i = 1; i <= NUMBER_DATASETS; i++) {
            Dataset.Builder dataset = new Dataset.Builder();
            //创建RemoteViews.插入xml布局并填写数据;
            RemoteView presentation =new  RemoteViews(getApplicationContext().
            .packageName,R.layout.multidataset_service_list_item);
            //给这个布局Item显示一个名字，remoteViewsText;
            presentation.setTextViewText(R.id.text, text);
            //把新的data添加到数据集;
            response.addDataset(dataset.build());
        }
         //最后通知android系统，完成该服务
        callback.onSuccess(response.build());
   }
}

接下来我们来说一下关于EditText的一些相关使用和数据；
1.AutofillHints和setImportantForAutofill
关于Autofill 在view上的两个关键属性autofillHints和setImportantForAutofill,autofillHints：在点击自动填充后，显示提示列表，如果不做处理或不添加属性则不会出现提示列表；
setImportantForAutofill：这个属性主要是用于在打开带有EdiText或TextView等一些View时，采用此属性进行设置，是否自动弹出或手动弹出，
activity_layout.xml定义；

<EditText
    android:id="@+id/username"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:autofillHints="password"
    android:inputType="textPassword"
    android:importantForAutofill="no"
    android:inputType="text"/>

MainActivity.java定义

public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    EditText et=findViewById(R.id.username);
   //点击自动填充弹出提示列表
    et.setAutofillHints(View.AUTOFILL_HINT_PASSWORD);
  //用来设置是否自动弹出提示列表
    et.setImportantForAutofill(View.IMPORTANT_FOR_AUTOFILL_NO);
    }
}

view.setAutofillHints() 方法来设置标记，相关值都是View类(api 26版本以上)中定义的一些String类型常量；

AUTOFILL_HINT_NAME 用户真名
AUTOFILL_HINT_PASSWORD 用户密码
AUTOFILL_HINT_PHONE 电话号码
AUTOFILL_HINT_EMAIL_ADDRESS 邮箱地址
AUTOFILL_HINT_POSTAL_CODE 邮寄编号
AUTOFILL_HINT_POSTAL_ADDRESS 邮寄地址
AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DAY 信用卡到期日
AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DATE 信用卡到期日期
AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_MONTH 信用卡到期月
AUTOFILL_HINT_CREDIT_CARD_NUMBER 信用卡卡号
AUTOFILL_HINT_CREDIT_CARD_SECURITY_CODE 信用卡安全密码
AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_YEAR 信用卡到期年
AUTOFILL_HINT_CREDIT_CARD_EXPIRATION_DAY 信用卡到期日

setImportantForAutofill()相关值都是View类(api 26版本以上)；

    //Automatically determine whether a view is important for autofill.
    public static final int IMPORTANT_FOR_AUTOFILL_AUTO = 0x0;
    //The view is important for autofill, but its children (if any) will not be traversed.
    public static final int IMPORTANT_FOR_AUTOFILL_YES = 0x1;
    //The view is not important for autofill, but its children (if any) will be traversed.
    public static final int IMPORTANT_FOR_AUTOFILL_NO = 0x2;
    //The view is important for autofill, but its children (if any) will not be traversed.
    public static final int IMPORTANT_FOR_AUTOFILL_YES_EXCLUDE_DESCENDANTS = 0x4;
    //The view is not important for autofill, and its children (if any) will not be traversed.
    public static final int IMPORTANT_FOR_AUTOFILL_NO_EXCLUDE_DESCENDANTS = 0x8;

android N 新增API Autofill

官方Demo;
https://github.com/googlesamples/android-AutofillFramework
https://download.csdn.net/download/xiao_yuanjl/10862116