应用程序在发布时崩溃，但在调试模式下运行良好

Question

我有应用程序上传在玩商店。它在调试模式下运行良好，但当我从play store下载相同的APK（发布模式）时，它就崩溃了。我无法确定堆栈跟踪没有给出准确的错误位置。

java.lang.RuntimeException：在Android.os.AsyncTask$3上完成(asynctask.java:318)在java.util.concurrent.FutureTask.FinishCompletion（futureTask.java:354)在java.util.concurrent.FutureTask.SetException（futureTask.java:223)在java.util.concurrent.FutureTask.Run（futureTask.java:242)在Android.os.AsyncTask$SerialExecutor$1上运行(asynctask.java:243)在java.util.concurrent.ThreadPoolExecutor.Runworker（在java.util.concurrent.ThreadPoolExecutor$worker.run(ThreadPoolExecutor.java:607)在java.lang.Thread.run(Thread.java:761)由以下原因引起：java.lang.NullPointerException：在com.biocare.fots.HomeActivity$GetEmpDetailStask.DoinBackground（HomeActivity.java）或在com.biocare.fots.HomeActivity$GetEmpDetailStask.DoinBackground（HomeActivity.java）在Android.os.AsyncTask$2。在java.util.concurrent.FutureTask.run（FU tureTask.java:237)在Android.os.AsyncTask$SerialExecutor$1上运行(asynctask.java:243)在java上运行.util.concurrent.ThreadPoolExecutor.RunWorker（ThreadPoolExecutor.java:1133)位于java.util.concurrent.ThreadPoolExecutor$worker.run（ThreadPoolExecutor.java:607)位于java.lang.Thread.run（Thread.java:761)

上面的堆栈跟踪是从Play Store Developer控制台复制的。在Firebase控制台中显示了相同的错误。

下面是我的AsyncTask代码：

 private static class GetEmpDetailsTask extends AsyncTask<Void, Void, Void> {

    WeakReference<HomeActivity> mContext;

    GetEmpDetailsTask(HomeActivity context) {
        mContext = new WeakReference<>(context);
    }

    @Override
    protected void onPreExecute() {
        super.onPreExecute();
    }

    @Override
    protected Void doInBackground(Void... voids) {
        if(android.os.Debug.isDebuggerConnected())
            android.os.Debug.waitForDebugger();
        AppDatabase appDatabase = AppDatabase.getAppDatabaseInstance(
                mContext.get());
        Employee employee = appDatabase.employeeDAO().get();
        FotApplication.Employee.Id = employee.employeeId;
        FotApplication.Employee.Name = employee.firstName + " "
                + employee.lastName;
        FotApplication.Employee.Designation = employee.empDesignationName;
        FotApplication.Employee.DesignationDesc = employee.empDesignationName;
        FotApplication.Employee.Email = employee.email;
        return null;
    }


    @Override
    protected void onPostExecute(Void aVoid) {
        mContext.get().mTvEmpName.setText(FotApplication.Employee.Name);
        mContext.get().mTvEmpEmail.setText(FotApplication.Employee.Email);
    }
}

下面是我的build.gradle（模块：应用程序）：

apply plugin: 'com.android.application'


android {
    signingConfigs {
        config {
            keyAlias 'abc'
            keyPassword 'test'
            storeFile file('path/to/keystore.jks')
            storePassword 'testpass'
        }
    }
    compileSdkVersion 29
    defaultConfig {
        applicationId "com.myapp.fats"
        minSdkVersion 22
        targetSdkVersion 29
        versionCode 38
        versionName "2.1.9"
        vectorDrawables.useSupportLibrary = true
    }
    buildTypes {
        debug {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
        release {
            minifyEnabled true
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    productFlavors {
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'androidx.appcompat:appcompat:1.0.2'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'androidx.legacy:legacy-support-v4:1.0.0'
    implementation 'androidx.recyclerview:recyclerview:1.0.0'
    implementation 'com.google.android.gms:play-services-location:17.0.0'
    implementation 'com.google.android.gms:play-services-maps:17.0.0'
    implementation 'com.google.android.gms:play-services-places:17.0.0'
    implementation 'com.jakewharton:butterknife:8.6.0'
    implementation 'com.google.firebase:firebase-messaging:19.0.1'
    implementation 'com.google.firebase:firebase-core:17.0.1'
    implementation 'com.crashlytics.sdk.android:crashlytics:2.10.1'
    implementation 'androidx.vectordrawable:vectordrawable:1.0.1'
    annotationProcessor 'com.jakewharton:butterknife:8.6.0'
    annotationProcessor 'androidx.room:room-compiler:2.1.0'
    implementation 'androidx.room:room-runtime:2.1.0'
    implementation 'androidx.cardview:cardview:1.0.0'
    implementation 'com.google.android.material:material:1.0.0'
    implementation 'com.squareup.retrofit2:retrofit:2.3.0'
    implementation 'com.google.code.gson:gson:2.8.5'
    implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
    implementation 'com.squareup.okhttp3:logging-interceptor:3.4.1'
    implementation 'com.squareup.okhttp3:okhttp:3.10.0'
    implementation 'com.afollestad.material-dialogs:commons:0.9.6.0'
    implementation 'de.hdodenhof:circleimageview:2.2.0'
    implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'
    implementation 'androidx.lifecycle:lifecycle-viewmodel:2.0.0'
    implementation 'com.amulyakhare:com.amulyakhare.textdrawable:1.0.1'
    implementation 'com.wang.avi:library:2.1.3'
    implementation 'androidx.gridlayout:gridlayout:1.0.0'
    implementation ('com.crashlytics.sdk.android:crashlytics:2.10.1@aar') {
        transitive = true
    }
}
repositories {
    mavenCentral()
}

apply plugin: 'com.google.gms.google-services'
apply plugin: 'io.fabric'

来自Android Studio的Logcat：

 Process: com.biocare.fots, PID: 15978
java.lang.RuntimeException: An error occurred while executing doInBackground()
    at android.os.AsyncTask$3.done(AsyncTask.java:353)
    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
    at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
    at java.util.concurrent.FutureTask.run(FutureTask.java:271)
    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
    at java.lang.Thread.run(Thread.java:764)
 Caused by: java.lang.NullPointerException: Attempt to read from field 'java.lang.String com.biocare.database.n.b' on a null object reference
    at com.biocare.fots.HomeActivity$a.a(Unknown Source:20)
    at com.biocare.fots.HomeActivity$a.doInBackground(Unknown Source:2)
    at android.os.AsyncTask$2.call(AsyncTask.java:333)

Answer 1

我想，如果您的DAO（F.E.Room）使用反射，那么当您使用minifyenable=true构建发行版apk时，您的DAO将无法找到某些内容。试着检查一下你的护卫。

是的，你有混淆的问题。“java.lang.String com.biocare.database.n.b”这个“n.b”表示在模糊处理之前您有正确的路径，但在模糊处理之后，路径被更改为值“n”和“b”。您应该在proguard排除列表中添加这些文件（我不知道某些文件，因为我不知道您的代码）。

您可以在proguard文档中阅读更多内容。这也是有用的