有谁知道我该怎么做才能使 JDBC 连接在 Android 4.0 上工作。它在 Android 1.6-2.3 上运行良好。我使用 Dave Cramer 的构建：http://groups.google.com/group/pgandroid/browse_thread/thread/d8b400f039f66d5f/f77b2e2a99370a36?lnk=raot#f77b2e2a99370a36 http://groups.google.com/group/pgandroid/browse_thread/thread/d8b400f039f66d5f/f77b2e2a99370a36?lnk=raot#f77b2e2a99370a36
Logcat 说：
06-10 17:35:51.043: E/AndroidRuntime(798): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.belonogov.connectjdbc/com.belonogov.connectjdbc.ConnectJDBCActivity}: java.lang.NullPointerException
06-10 17:35:51.043: E/AndroidRuntime(798):
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
06-10 17:35:51.043: E/AndroidRuntime(798):
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
06-10 17:35:51.043: E/AndroidRuntime(798):
at android.app.ActivityThread.access$600(ActivityThread.java:123)
06-10 17:35:51.043: E/AndroidRuntime(798):
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
06-10 17:35:51.043: E/AndroidRuntime(798):
at android.os.Handler.dispatchMessage(Handler.java:99)
06-10 17:35:51.043: E/AndroidRuntime(798):
at android.os.Looper.loop(Looper.java:137)
06-10 17:35:51.043: E/AndroidRuntime(798):
at android.app.ActivityThread.main(ActivityThread.java:4424)
06-10 17:35:51.043: E/AndroidRuntime(798):
at java.lang.reflect.Method.invokeNative(Native Method)
06-10 17:35:51.043: E/AndroidRuntime(798):
at java.lang.reflect.Method.invoke(Method.java:511)
06-10 17:35:51.043: E/AndroidRuntime(798):
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-10 17:35:51.043: E/AndroidRuntime(798):
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-10 17:35:51.043: E/AndroidRuntime(798):
at dalvik.system.NativeStart.main(Native Method)
06-10 17:35:51.043: E/AndroidRuntime(798): Caused by: java.lang.NullPointerException
06-10 17:35:51.043: E/AndroidRuntime(798):
at com.belonogov.connectjdbc.ConnectJDBCActivity$CustomDrawableView.<init>(ConnectJDBCActivity.java:81)
06-10 17:35:51.043: E/AndroidRuntime(798):
at com.belonogov.connectjdbc.ConnectJDBCActivity.onCreate(ConnectJDBCActivity.java:27)
06-10 17:35:51.043: E/AndroidRuntime(798):
at android.app.Activity.performCreate(Activity.java:4465)
06-10 17:35:51.043: E/AndroidRuntime(798):
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
06-10 17:35:51.043: E/AndroidRuntime(798):
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
06-10 17:35:51.043: E/AndroidRuntime(798):
... 11 more
它只是一个连接到数据库的简单应用程序。
如果可能的话，请考虑在 Android 设备上放弃直接 JDBC。它在往返等方面效率低下，并且在面对不可靠的连接时并不稳健。
See 如何在 android 中安全（间接）查询 postgresql 数据库？ https://stackoverflow.com/questions/10881538/how-can-i-securely-indirectly-query-a-postgresql-database-within-android/10890705#10890705 .
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