我正在尝试将 Sugar ORM (v 1.3) 集成到我的 Android 应用程序中，并且在尝试保存新创建的实体时不断出现崩溃 (NullPointerException)。
这是我的崩溃...
01-21 06:02:36.012 2856-2856/com.spuddmobile.kel E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.spuddmobile.kel, PID: 2856
java.lang.NullPointerException
at com.orm.SugarRecord.save(SugarRecord.java:109)
at com.orm.SugarRecord.save(SugarRecord.java:45)
at com.spuddmobile.kel.Fragments.NewAppFragment._SaveForm(NewAppFragment.java:231)
at com.spuddmobile.kel.Fragments.NewAppFragment.onMenuItemSelection(NewAppFragment.java:175)
at com.spuddmobile.kel.Activities.MainActivity.onOptionsItemSelected(MainActivity.java:89)
at android.app.Activity.onMenuItemSelected(Activity.java:2600)
at com.android.internal.policy.impl.PhoneWindow.onMenuItemSelected(PhoneWindow.java:1012)
at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:735)
at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152)
at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:874)
at com.android.internal.view.menu.ActionMenuView.invokeItem(ActionMenuView.java:546)
at com.android.internal.view.menu.ActionMenuItemView.onClick(ActionMenuItemView.java:115)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
at dalvik.system.NativeStart.main(Native Method)
这是我的 AppManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.spuddmobile.kel" >
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:name="com.orm.SugarApp"
android:theme="@style/AppTheme" >
<meta-data android:name="DATABASE" android:value="kel.db" />
<meta-data android:name="VERSION" android:value="1" />
<meta-data android:name="QUERY_LOG" android:value="true" />
<meta-data android:name="DOMAIN_PACKAGE_NAME" android:value="com.spuddmobile.kel.Model" />
<activity
android:name=".Activities.MainActivity"
android:label="@string/app_name"
android:windowSoftInputMode="stateHidden|adjustResize">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
<meta-data android:name="android.support.UI_OPTIONS" android:value="splitActionBarWhenNarrow" />
</activity>
</application>
</manifest>
正如你所看到的，我肯定是按照文档设置android:name的com.orm.SugarApp。
这是我的实体/域类...
public class Appraisal extends SugarRecord<Appraisal>
{
Double rent;
Integer area;
Integer currentPeriod;
Integer reviewFrequency;
Integer rentFreePeriod;
Integer interimRentPeriod;
Double interimRentPrice;
Integer secondInterimRentPeriod;
Double secondInterimRentPrice;
Double incentives;
Integer breakPeriod;
Double breakPenalty;
Double breakIncentiveRent;
Integer breakIncentiveRentPeriod;
Double breakRisk;
String name;
Date createdDate;
Date updatedDate;
public Appraisal ()
{
}
public Appraisal (Double rent,
Integer area,
Integer currentPeriod,
Integer reviewFrequency,
Integer rentFreePeriod,
Integer interimRentPeriod,
Double interimRentPrice,
Integer secondInterimRentPeriod,
Double secondInterimRentPrice,
Double incentives,
Integer breakPeriod,
Double breakPenalty,
Double breakIncentiveRent,
Integer breakIncentiveRentPeriod,
Double breakRisk,
String name,
Date createdDate,
Date updatedDate)
{
this.rent = rent;
this.area = area;
this.currentPeriod = currentPeriod;
this.reviewFrequency = reviewFrequency;
this.rentFreePeriod = rentFreePeriod;
this.interimRentPeriod = interimRentPeriod;
this.interimRentPrice = interimRentPrice;
this.secondInterimRentPeriod = secondInterimRentPeriod;
this.secondInterimRentPrice = secondInterimRentPrice;
this.incentives = incentives;
this.breakPeriod = breakPeriod;
this.breakPenalty = breakPenalty;
this.breakIncentiveRent = breakIncentiveRent;
this.breakIncentiveRentPeriod = breakIncentiveRentPeriod;
this.breakRisk = breakRisk;
this.name = name;
this.createdDate = createdDate;
this.updatedDate = updatedDate;
}
}
请注意，我的实体实际上扩展了 SugarRecord，并且我确实提供了所需的空构造函数以及参数化构造函数。我没有用上下文覆盖 super init 方法，因为根据 Sugar ORM v1.3 中不再需要的文档。
最后，崩溃的代码......
// create new app
Appraisal nApp = new Appraisal();
nApp.save();
存档就是崩溃的地方。现在，我已通过 Android 设备监视器检查以确保正确创建了数据库，并且它确实存在于一个 APPRAISAL 表中。但是，当我查询该表时，它是空的，这是有道理的，因为 Sugar 永远不会完成该save()功能。
有人知道我在这里做错了吗？为了确保我提供了所有相关信息，我的 Gradle 构建脚本如下所示。
buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:1.0.0'
}
}
apply plugin: 'android'
android {
compileSdkVersion 13
buildToolsVersion '19.1.0'
defaultConfig {
applicationId 'com.spuddmobile.kel'
minSdkVersion 13
targetSdkVersion 17
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
productFlavors {}
}
repositories {
mavenCentral()
}
dependencies {
compile 'com.noveogroup.android:android-logger:1.3.4'
compile 'com.github.satyan:sugar:1.3'
}