Android Studio:使用Mongo Java Driver连接到MongoDB服务器

有很多关于这个问题的post,但似乎没有人工作,所以maby有些事情发生了变化。

我正在尝试将我的Android应用程序连接到位于mLab上的MongoDB服务器。 我正在使用Mongo Java Drived,并且当然将库添加到android studio。

可以启动应用程序,但是当我单击注册按钮时,应用程序会崩溃。

这是我的代码:

import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import org.bson.Document; import com.mongodb.MongoClient; import com.mongodb.MongoClientURI; import com.mongodb.client.MongoCollection; import com.mongodb.client.MongoDatabase; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); final EditText username = (EditText)findViewById(R.id.username); final Button bRegister = (Button) findViewById(R.id.bRegister); bRegister.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { String stringUsername = username.toString(); try { addToDatabase(stringUsername); } catch(Exception e) { e.printStackTrace(); } } }); } private static void addToDatabase(String username){ MongoClientURI uri = new MongoClientURI("mongodb:///*mLab database URL */"); MongoClient client = new MongoClient(uri); MongoDatabase db = client.getDatabase(uri.getDatabase()); MongoCollection coll = db.getCollection("newDB"); Document doc = new Document("username", username); coll.insertOne(doc); client.close(); } } 

我在清单文件中也有permision.INTERNET。

任何帮助将非常感谢!

//编辑Stacktrace: 03/10 02:43:09: Launching app Cold swapped changes. $ adb shell am start -n "com.newhdc.pedergb.mongodb_servertester/com.newhdc.pedergb.mongodb_servertester.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER Client not ready yet..Waiting for process to come online Connected to process 4752 on device emulator-5554 D/NetworkSecurityConfig: No Network Security Config specified, using platform default W/org.bson.ObjectId: Failed to get process identifier from JMX, using random number instead java.lang.NoClassDefFoundError: Failed resolution of: Ljava/lang/management/ManagementFactory; at org.bson.types.ObjectId.createProcessIdentifier(ObjectId.java:533) at org.bson.types.ObjectId.(ObjectId.java:491) at com.mongodb.connection.ClusterId.(ClusterId.java:47) at com.mongodb.connection.DefaultClusterFactory.create(DefaultClusterFactory.java:105) at com.mongodb.Mongo.createCluster(Mongo.java:744) at com.mongodb.Mongo.createCluster(Mongo.java:728) at com.mongodb.Mongo.createCluster(Mongo.java:702) at com.mongodb.Mongo.(Mongo.java:310) at com.mongodb.Mongo.(Mongo.java:306) at com.mongodb.MongoClient.(MongoClient.java:284) at com.newhdc.pedergb.mongodb_servertester.MainActivity.addToDatabase(MainActivity.java:39) at com.newhdc.pedergb.mongodb_servertester.MainActivity.access$000(MainActivity.java:14) at com.newhdc.pedergb.mongodb_servertester.MainActivity$1.onClick(MainActivity.java:29) at android.view.View.performClick(View.java:5637) at android.view.View$PerformClick.run(View.java:22429) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) Caused by: java.lang.ClassNotFoundException: Didn't find class "java.lang.management.ManagementFactory" on path: DexPathList[[dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-support-annotations-25.1.0_11ac1b6ae4b8623fca16868c12f685674e962f99-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_9-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_8-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_7-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_6-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_5-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_4-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_3-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_2-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_1-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_0-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-mongodb-driver-core-3.4.2_cf1ecbf321a58b8bf97e118b2c0ff7614ac982a5-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-mongodb-driver-3.4.2_cfefe7ed281d321e57736b38e1e68fc6160680ac-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-com.android.support-support-vector-drawable-25.1.0_3dbe341ffa762dac2cc1137bc6aae1731f3bc1c0-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-com.android.support-support-v4-25.1.0_c534a46cb17b55c593319a94e0d90e0b75103a24-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-com.android.support-support-media-compat-25.1.0_b58e3876df91b49420cb0766dd6edfdbff0dedbc-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-com.android.support-support-fragment-25.1.0_d616629f11d994c207dfc4b5d01648e3194bccbc-classes.dex", dex f I/cluster: Cluster created with settings {hosts=[ds123080.mlab.com:23080], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500} D/AndroidRuntime: Shutting down VM E/AndroidRuntime: **FATAL EXCEPTION**: main Process: com.newhdc.pedergb.mongodb_servertester, PID: 4752 java.lang.ExceptionInInitializerError at com.mongodb.connection.InternalStreamConnectionFactory.(InternalStreamConnectionFactory.java:41) at com.mongodb.connection.DefaultClusterableServerFactory.create(DefaultClusterableServerFactory.java:68) at com.mongodb.connection.BaseCluster.createServer(BaseCluster.java:360) at com.mongodb.connection.SingleServerCluster.(SingleServerCluster.java:54) at com.mongodb.connection.DefaultClusterFactory.create(DefaultClusterFactory.java:114) at com.mongodb.Mongo.createCluster(Mongo.java:744) at com.mongodb.Mongo.createCluster(Mongo.java:728) at com.mongodb.Mongo.createCluster(Mongo.java:702) at com.mongodb.Mongo.(Mongo.java:310) at com.mongodb.Mongo.(Mongo.java:306) at com.mongodb.MongoClient.(MongoClient.java:284) at com.newhdc.pedergb.mongodb_servertester.MainActivity.addToDatabase(MainActivity.java:39) at com.newhdc.pedergb.mongodb_servertester.MainActivity.access$000(MainActivity.java:14) at com.newhdc.pedergb.mongodb_servertester.MainActivity$1.onClick(MainActivity.java:29) at android.view.View.performClick(View.java:5637) at android.view.View$PerformClick.run(View.java:22429) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.security.CodeSource java.security.ProtectionDomain.getCodeSource()' on a null object reference at com.mongodb.connection.ClientMetadataHelper.getDriverVersion(ClientMetadataHelper.java:111) at com.mongodb.connection.ClientMetadataHelper.getDriverInformation(ClientMetadataHelper.java:201) at com.mongodb.connection.ClientMetadataHelper.addDriverInformation(ClientMetadataHelper.java:182) at com.mongodb.connection.ClientMetadataHelper.(ClientMetadataHelper.java:64) at com.mongodb.connection.InternalStreamConnectionFactory.(InternalStreamConnectionFactory.java:41) at com.mongodb.connection.DefaultClusterableServerFactory.create(DefaultClusterableServerFactory.java:68) at com.mongodb.connection.BaseCluster.createServer(BaseCluster.java:360) at com.mongodb.connection.SingleServerCluster.(SingleServerCluster.java:54) at com.mongodb.connection.DefaultClusterFactory.create(DefaultClusterFactory.java:114) at com.mongodb.Mongo.createCluster(Mongo.java:744) at com.mongodb.Mongo.createCluster(Mongo.java:728) at com.mongodb.Mongo.createCluster(Mongo.java:702) at com.mongodb.Mongo.(Mongo.java:310) at com.mongodb.Mongo.(Mongo.java:306) at com.mongodb.MongoClient.(MongoClient.java:284) at com.newhdc.pedergb.mongodb_servertester.MainActivity.addToDatabase(MainActivity.java:39) at com.newhdc.pedergb.mongodb_servertester.MainActivity.access$000(MainActivity.java:14) at com.newhdc.pedergb.mongodb_servertester.MainActivity$1.onClick(MainActivity.java:29) at android.view.View.performClick(View.java:5637) at android.view.View$PerformClick.run(View.java:22429) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) Application terminated. 03/10 02:43:09: Launching app Cold swapped changes. $ adb shell am start -n "com.newhdc.pedergb.mongodb_servertester/com.newhdc.pedergb.mongodb_servertester.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER Client not ready yet..Waiting for process to come online Connected to process 4752 on device emulator-5554 D/NetworkSecurityConfig: No Network Security Config specified, using platform default W/org.bson.ObjectId: Failed to get process identifier from JMX, using random number instead java.lang.NoClassDefFoundError: Failed resolution of: Ljava/lang/management/ManagementFactory; at org.bson.types.ObjectId.createProcessIdentifier(ObjectId.java:533) at org.bson.types.ObjectId.(ObjectId.java:491) at com.mongodb.connection.ClusterId.(ClusterId.java:47) at com.mongodb.connection.DefaultClusterFactory.create(DefaultClusterFactory.java:105) at com.mongodb.Mongo.createCluster(Mongo.java:744) at com.mongodb.Mongo.createCluster(Mongo.java:728) at com.mongodb.Mongo.createCluster(Mongo.java:702) at com.mongodb.Mongo.(Mongo.java:310) at com.mongodb.Mongo.(Mongo.java:306) at com.mongodb.MongoClient.(MongoClient.java:284) at com.newhdc.pedergb.mongodb_servertester.MainActivity.addToDatabase(MainActivity.java:39) at com.newhdc.pedergb.mongodb_servertester.MainActivity.access$000(MainActivity.java:14) at com.newhdc.pedergb.mongodb_servertester.MainActivity$1.onClick(MainActivity.java:29) at android.view.View.performClick(View.java:5637) at android.view.View$PerformClick.run(View.java:22429) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) Caused by: java.lang.ClassNotFoundException: Didn't find class "java.lang.management.ManagementFactory" on path: DexPathList[[dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-support-annotations-25.1.0_11ac1b6ae4b8623fca16868c12f685674e962f99-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_9-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_8-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_7-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_6-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_5-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_4-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_3-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_2-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_1-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-slice_0-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-mongodb-driver-core-3.4.2_cf1ecbf321a58b8bf97e118b2c0ff7614ac982a5-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-mongodb-driver-3.4.2_cfefe7ed281d321e57736b38e1e68fc6160680ac-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-com.android.support-support-vector-drawable-25.1.0_3dbe341ffa762dac2cc1137bc6aae1731f3bc1c0-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-com.android.support-support-v4-25.1.0_c534a46cb17b55c593319a94e0d90e0b75103a24-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-com.android.support-support-media-compat-25.1.0_b58e3876df91b49420cb0766dd6edfdbff0dedbc-classes.dex", dex file "/data/data/com.newhdc.pedergb.mongodb_servertester/files/instant-run/dex/slice-com.android.support-support-fragment-25.1.0_d616629f11d994c207dfc4b5d01648e3194bccbc-classes.dex", dex f I/cluster: Cluster created with settings {hosts=[ds123080.mlab.com:23080], mode=SINGLE, requiredClusterType=UNKNOWN, serverSelectionTimeout='30000 ms', maxWaitQueueSize=500} D/AndroidRuntime: Shutting down VM E/AndroidRuntime: **FATAL EXCEPTION**: main Process: com.newhdc.pedergb.mongodb_servertester, PID: 4752 java.lang.ExceptionInInitializerError at com.mongodb.connection.InternalStreamConnectionFactory.(InternalStreamConnectionFactory.java:41) at com.mongodb.connection.DefaultClusterableServerFactory.create(DefaultClusterableServerFactory.java:68) at com.mongodb.connection.BaseCluster.createServer(BaseCluster.java:360) at com.mongodb.connection.SingleServerCluster.(SingleServerCluster.java:54) at com.mongodb.connection.DefaultClusterFactory.create(DefaultClusterFactory.java:114) at com.mongodb.Mongo.createCluster(Mongo.java:744) at com.mongodb.Mongo.createCluster(Mongo.java:728) at com.mongodb.Mongo.createCluster(Mongo.java:702) at com.mongodb.Mongo.(Mongo.java:310) at com.mongodb.Mongo.(Mongo.java:306) at com.mongodb.MongoClient.(MongoClient.java:284) at com.newhdc.pedergb.mongodb_servertester.MainActivity.addToDatabase(MainActivity.java:39) at com.newhdc.pedergb.mongodb_servertester.MainActivity.access$000(MainActivity.java:14) at com.newhdc.pedergb.mongodb_servertester.MainActivity$1.onClick(MainActivity.java:29) at android.view.View.performClick(View.java:5637) at android.view.View$PerformClick.run(View.java:22429) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.security.CodeSource java.security.ProtectionDomain.getCodeSource()' on a null object reference at com.mongodb.connection.ClientMetadataHelper.getDriverVersion(ClientMetadataHelper.java:111) at com.mongodb.connection.ClientMetadataHelper.getDriverInformation(ClientMetadataHelper.java:201) at com.mongodb.connection.ClientMetadataHelper.addDriverInformation(ClientMetadataHelper.java:182) at com.mongodb.connection.ClientMetadataHelper.(ClientMetadataHelper.java:64) at com.mongodb.connection.InternalStreamConnectionFactory.(InternalStreamConnectionFactory.java:41) at com.mongodb.connection.DefaultClusterableServerFactory.create(DefaultClusterableServerFactory.java:68) at com.mongodb.connection.BaseCluster.createServer(BaseCluster.java:360) at com.mongodb.connection.SingleServerCluster.(SingleServerCluster.java:54) at com.mongodb.connection.DefaultClusterFactory.create(DefaultClusterFactory.java:114) at com.mongodb.Mongo.createCluster(Mongo.java:744) at com.mongodb.Mongo.createCluster(Mongo.java:728) at com.mongodb.Mongo.createCluster(Mongo.java:702) at com.mongodb.Mongo.(Mongo.java:310) at com.mongodb.Mongo.(Mongo.java:306) at com.mongodb.MongoClient.(MongoClient.java:284) at com.newhdc.pedergb.mongodb_servertester.MainActivity.addToDatabase(MainActivity.java:39) at com.newhdc.pedergb.mongodb_servertester.MainActivity.access$000(MainActivity.java:14) at com.newhdc.pedergb.mongodb_servertester.MainActivity$1.onClick(MainActivity.java:29) at android.view.View.performClick(View.java:5637) at android.view.View$PerformClick.run(View.java:22429) at android.os.Handler.handleCallback(Handler.java:751) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6119) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776) Application terminated.

我遇到过同样的问题。 确实问题是你在主线程中调用连接。 将以下内容添加到onCreate方法中。

 @Override protected void onCreate(Bundle savedInstanceState) { if (android.os.Build.VERSION.SDK_INT > 9) { StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(policy); } 

希望有所帮助。

不幸的是,根据StackOverflow的post ,Mongo Java Driver无法在Android上运行,因为Android缺少一些Java类。 但是,一种StackOverflow用户已经分叉了Mongo Java Driver并解决了这个问题。 你可以在Github上看到他们的库版本。

向下滚动到说明并下载最新的jar文件。 现在,就是这个:

https://github.com/matfur92/mongo-java-driver/blob/gh-pages/JARs/mongo-java-driver-3.4.0-SNAPSHOT.jar?raw=true

接下来,继续并删除mongo-java-driver的build.gradle依赖项中的行。 要删除的行应如下所示:

 dependencies { ... compile 'org.mongodb:mongodb-driver:3.4.2' ... } 

最后,将您下载的jar添加到您的应用程序中( 此处为指南 )。 现在您的代码应该无需修改即可运行 我能够正常使用常规MongoDBfunction,但我无法使GridFS工作。