我正在开发一个Android应用程序，并遇到了java.lang.ClassNotFoundException。几个小时前，我很高兴地构建我的应用程序，当我尝试编译它时，它在运行时期间因上述错误而崩溃，但完全编译。
我很困惑这可能是问题的原因，因为这不是将类添加到清单的简单修复，因为我已经这样做了。
还没有找到facebook SDK，这非常令人担心，因为我已导入它并且在编译之前没有显示任何错误。
在几分钟前运行我的应用程序时，当我尝试提出解决方案时，我的活动在相同的异常情况下崩溃，即使它们都已在清单中声明并且一切设置正确。我不知道是否会发生这种情况，因为我在活动中使用了碎片或其他东西。基本上，在我将Facebook添加到应用程序之前，它工作得非常好。现在肯定比我现在的状态好，这是肯定的。
这是我的Android清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.powerofpixels.magpie" >
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme"
android:name=".Magpie">
<meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/facebook_app_id"/>
<!-- Facebook activity for login and sharing -->
<activity android:name="com.facebook.FacebookActivity"
android:configChanges=
"keyboard|keyboardHidden|screenLayout|screenSize|orientation"
android:theme="@android:style/Theme.Translucent.NoTitleBar"
android:label="@string/app_name" />
<activity android:name=".ui.activity.BirthdayFeedActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ui.activity.AuthActivity" ></activity>
</application>
</manifest>
以下是gradle文件：
apply plugin: 'com.android.application'
android {
compileSdkVersion 23
buildToolsVersion "23.0.3"
defaultConfig {
applicationId "com.powerofpixels.magpie"
minSdkVersion 15
targetSdkVersion 23
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
packagingOptions {
exclude 'META-INF/LICENSE'
exclude 'META-INF/LICENSE-FIREBASE.txt'
exclude 'META-INF/NOTICE'
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.3.0'
compile 'com.android.support:support-v4:23.3.0'
compile 'com.jakewharton:butterknife:7.0.1'
compile 'com.facebook.android:facebook-android-sdk:4.11.0'
compile 'com.firebase:firebase-client-android:2.5.2'
compile 'com.android.support:design:23.3.0'
}
这是我的Magpie java类：
package com.powerofpixels.magpie;
import android.app.Application;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.Signature;
import android.util.Base64;
import android.util.Log;
import com.facebook.FacebookSdk;
import com.firebase.client.Firebase;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Created by Tom Finet on 16/04/2016.
*/
public class Magpie extends Application {
@Override
public void onCreate() {
super.onCreate();
FacebookSdk.sdkInitialize(getApplicationContext());
/* Initialize Firebase */
Firebase.setAndroidContext(getApplicationContext());
/* Enable disk persistence */
Firebase.getDefaultConfig().setPersistenceEnabled(true);
// print out the key hash, to prevent hackers from accessing user information
try {
PackageInfo info = getPackageManager().getPackageInfo(
"com.powerofpixels.magpie",
PackageManager.GET_SIGNATURES);
for (Signature signature : info.signatures) {
MessageDigest md = MessageDigest.getInstance("SHA");
md.update(signature.toByteArray());
Log.d("KeyHash:", Base64.encodeToString(md.digest(), Base64.DEFAULT));
}
} catch (PackageManager.NameNotFoundException | NoSuchAlgorithmException e) {
e.printStackTrace();
}
}
}
简而言之，logcat基本上说：
java.lang.RuntimeException: Unable to instantiate application com.android.tools.fd.runtime.BootstrapApplication: java.lang.IllegalStateException: java.lang.ClassNotFoundException: com.powerofpixels.magpie.Magpie
Caused by: java.lang.IllegalStateException: java.lang.ClassNotFoundException: com.powerofpixels.magpie.Magpie
Caused by: java.lang.ClassNotFoundException: com.powerofpixels.magpie.Magpie
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.powerofpixels.magpie.Magpie" on path: DexPathList[[zip file "/data/app/com.powerofpixels.magpie-1/base.apk"],nativeLibraryDirectories=[/data/app/com.powerofpixels.magpie-1/lib/x86, /vendor/lib, /system/lib]]
Suppressed: java.lang.ClassNotFoundException: com.powerofpixels.magpie.Magpie
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available
java.lang.RuntimeException: Unable to instantiate application com.android.tools.fd.runtime.BootstrapApplication: java.lang.IllegalStateException: java.lang.ClassNotFoundException: com.powerofpixels.magpie.Magpie`
Caused by: java.lang.IllegalStateException: java.lang.ClassNotFoundException: com.powerofpixels.magpie.Magpie
java.lang.NoClassDefFoundError: Failed resolution of: Lcom/facebook/FacebookSdk;
at com.powerofpixels.magpie.Magpie.onCreate(Magpie.java:24)
Caused by: java.lang.ClassNotFoundException: Didn't find class "com.facebook.FacebookSdk" on path: DexPathList[[dex file "/data/data/com.powerofpixels.magpie/files/instant-run/dex/slice-slice_3-classes.dex", dex file "/data/data/com.powerofpixels.magpie/files/instant-run/dex/slice-slice_1-classes.dex"],nativeLibraryDirectories=[/data/app/com.powerofpixels.magpie-1/lib/x86, /vendor/lib, /system/lib]]
Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack trace available
关于如何帮助我取得进步的任何想法？感谢。