这是我在Logcat中得到的：

E/ROOM: Invalidation tracker is initialized twice :/.

E/Itemmoved: Counterfrom3

next item:to2

在onCreate中初始化数据库.

db = Room.databaseBuilder(getApplicationContext(),AppDatabase.class,DB_NAME)
                .fallbackToDestructiveMigration()
                .allowMainThreadQueries()
                .build();

RecyclerView适配器代码.

@Override
public boolean onItemmove(int fromPosition,int toPosition) {
    String name = dataSet.get(fromPosition).getName();
    //this will make "Add item" do not move from its first position..
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        if (!(Objects.equals(name,"Add") || (toPosition == 0 && fromPosition == 1))) {
            Collections.swap(dataSet,fromPosition,toPosition);
            MoveItem(fromPosition,toPosition);
            notifyItemmoved(fromPosition,toPosition);
            return true;
        }
    }
    return false;
}

移动项目时更新数据的代码.

public static void MoveItem(int fromPosition,int toPosition){
        String name = data.get(fromPosition).getName(); //This gets the current item name in the view 
        String nexName = data.get(toPosition).getName(); //This gets the next item name in the view 

        ContentValues fromContentValues = new ContentValues();
        fromContentValues.put("posItem",toPosition); //adding data to ContentValues
        ContentValues toContentValues = new ContentValues();
        toContentValues.put("posItem",fromPosition);
        Log.e("Item moved",name + "from" + fromPosition + "\n" + "next item:" + "to" + toPosition);

        db.beginTransaction();
        try {
        db.getopenHelper().getWritableDatabase().update(name,fromContentValues,"posItem =" + fromPosition,null);

        db.getopenHelper().getWritableDatabase().update(nexName,toContentValues,"posItem =" + toPosition,null);
        db.setTransactionSuccessful(); //setting Transaction Successful
        } finally {
            db.endTransaction(); // commit or rollback
            db.close(); //closing database
        }
    }

但是,如果我保持一切相同并回到使用Room v1.0.0,那么就不会出现这样的问题,一切都很完美.

所以,可能是Room v1.1.0问题

google issues

java.lang.IllegalArgumentException: java.security.spec.InvalidKeySpecException: java.lang.RuntimeException: error:0D07209B:asn1 encoding routines:ASN1_get_object:too long
at com.nightowl.memory.Security.generatePublicKey(Security.java:85)
at com.nightowl.memory.Security.verifyPurchase(Security.java:65)
at com.nightowl.memory.IabHelper.queryPurchases(IabHelper.java:875)
at com.nightowl.memory.IabHelper.queryInventory(IabHelper.java:550)
at com.nightowl.memory.IabHelper.queryInventory(IabHelper.java:528)
at com.nightowl.memory.IabHelper$2.run(IabHelper.java:623)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.security.spec.InvalidKeySpecException: java.lang.RuntimeException: error:0D07209B:asn1 encoding routines:ASN1_get_object:too long
at com.android.org.conscrypt.OpenSSLKey.getPublicKey(OpenSSLKey.java:101)
at com.android.org.conscrypt.OpenSSlrsAKeyFactory.engineGeneratePublic(OpenSSlrsAKeyFactory.java:47)
at java.security.KeyFactory.generatePublic(KeyFactory.java:171)
at com.nightowl.memory.Security.generatePublicKey(Security.java:80)
... 6 more
Caused by: java.lang.RuntimeException: error:0D07209B:asn1 encoding routines:ASN1_get_object:too long
at com.android.org.conscrypt.NativeCrypto.d2i_PUBKEY(Native Method)
at com.android.org.conscrypt.OpenSSLKey.getPublicKey(OpenSSLKey.java:99)
... 9 more

我使用以下代码来调用它：

String base64EncodedPublicKey;
            base64EncodedPublicKey= String.valueOf(R.string.myPubKey);
            additionalSkuList = new ArrayList<String>();
            for(int i=0;i<3;i++)
            {
                for(int j=0;j<4;j++)
                {
                    if(i==0&&j>1)
                        break;
                    additionalSkuList.add(id[i][j]);
                }
            }
            mHelper = new IabHelper(this,base64EncodedPublicKey);
            mHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() {
                public void onIabSetupFinished(IabResult result) {
                    Log.d("main","m here");
                    if (!result.isSuccess()) {
                        // Oh noes,there was a problem.
                        Log.d("main","Problem setting up in-app Billing: " + result);
                    }
                    // Hooray,IAB is fully set up!
                    isIAB = true;

                    mHelper.queryInventoryAsync(true,additionalSkuList,mQueryFinishedListener);
                    Log.d("main","" + isIAB + " " + isLoad);
                }
            });


IabHelper.QueryInventoryFinishedListener
            mQueryFinishedListener = new IabHelper.QueryInventoryFinishedListener() {
        public void onQueryInventoryFinished(IabResult result,Inventory inventory)
        {
            Log.d("main","m here too");
            if (result.isFailure()) {
                // handle error
                return;
            }
            for(int i=0;i<3;i++)
            {
                for(int j=0;j<4;j++)
                {
                    if(i==0&&j>1)
                        break;
                    price[i][j]=inventory.getSkuDetails(id[i][j]).getPrice();
                }
            }
            isLoad=true;
            data.setPrice(price);
            data.setDataLoad(true);
            // update the UI
        }
    };

    public void onPurchaseCall()
    {
        int loc[] = data.getItem();
        mHelper.launchPurchaseFlow(this,id[loc[0]][loc[1]],100*loc[0]+loc[1],mpurchaseFinishedListener,id[loc[0]][loc[1]]);
    }
    IabHelper.OnIabPurchaseFinishedListener mpurchaseFinishedListener
            = new IabHelper.OnIabPurchaseFinishedListener() {
        public void onIabPurchaseFinished(IabResult result,Purchase purchase)
        {
            if (result.isFailure()) {
                Log.d("main","Error purchasing: " + result);
                return;
            }
            else if (purchase.getSku().equals(id[0][0])) {
                data.setNoads(1);
                mAdView.setVisibility(View.INVISIBLE);
                data.setNotificationState(1);
                data.setNoOfnotifications(2);
                data.setNotificationMsg(0,"Purchase Complete");
                data.setNotificationMsg(1,PurchaseMsg[0]);
                // consume the gas and update the UI
            }


        }
    };

任何人都可以帮我解决吗？我从日志中猜到的是我提供的公钥存在问题.但它第一次起作用(直到我成功购买才开始工作).我还得到了所有应用内商品的价目表.

我试图用测试帐户测试购买.成功完成购买后出现此错误,从那时起该应用程序未针对该帐户运行.

android.content.pm.PackageManager$NameNotFoundException: Application package com.google.android.backup not found
        at android.app.ContextImpl.createPackageContextAsUser(ContextImpl.java:2172)
        at android.app.ContextImpl.createPackageContext(ContextImpl.java:2148)
        at android.content.Contextwrapper.createPackageContext(Contextwrapper.java:671)
        at com.google.android.gms.backup.an.<init>(SourceFile:47)
        at com.google.android.gms.backup.BackupTransportMigratorService.f(SourceFile:248)
        at com.google.android.gms.backup.BackupTransportMigratorService.b(SourceFile:196)
        at com.google.android.gms.backup.BackupTransportMigratorService.onHandleIntent(SourceFile:131)
        at android.app.IntentService$ServiceHandler.handleMessage(IntentService.java:65)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:135)

我的android清单如下所示

<?xml version="1.0" encoding="utf-8"?>
           <manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cornex.criminalintent" >

<application
    android:allowBackup="true"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity android:name=".CrimeListActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>
            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
    </activity>
    <activity
        android:name=".CrimePagerActivity"
        android:label="@string/app_name" >

    </activity>
</application>

<application
   android:allowBackup="true"
   android:backupAgent="YOUR_BACKUP_AGENT">

   <Meta-data 
      android:name="com.google.android.backup.api_key"
      android:value="YOUR_API_KEY" />
</application>

Android提供BackUpAgentHelper类来处理数据备份的所有操作.要使用此类,您必须使用它扩展您的类.其语法如下：相应的备份代理可以实现,如下面的清单所示.

import android.app.backup.BackupAgentHelper;

public class YOUR_BACKUP_AGENT extends BackupAgentHelper {    

}

要备份的持久性数据是两种形式之一.它可以是SharedPrefrences,也可以是File. Android在SharedPreferencesBackupHelper和FileBackupHelper各自的类中支持两种类型的备份.

要使用SharedPerefernceBackupHelper,您需要使用sharedPerefernces文件的名称实例化其对象.其语法如下 –

static final String File_Name_Of_Prefrences = "myPrefrences";
SharedPreferencesBackupHelper helper = new SharedPreferencesBackupHelper(this,File_Name_Of_Prefrences);

您需要做的最后一件事是通过指定备份密钥字符串和帮助程序对象来调用addHelper方法.其语法如下 –

addHelper(PREFS_BACKUP_KEY,helper);

addHelper方法将自动向给定数据子集添加帮助程序到代理程序的配置.

有关详细信息,请参阅this Tutorial和this article