Android Studio, Db connection error: Something unusual has occurred to cause the driver to fail. Please report this exception
Android Studio, Db connection error: Something unusual has occurred to cause the driver to fail. Please report this exception
我开始讨论是因为我对 Android 中正在处理的一个学校项目有一个大问题。
现在我有一个在线服务 ElephantSQL 的免费数据库。
数据库非常完美，因为当我尝试使用 IntelliJIDEA 将它连接到用 java 编写的项目时，一切正常。
但是，如果我尝试在 Android Studio 中使用 Kotlin 编写的代码连接具有相同凭据（IP、用户名、密码等）的数据库，连接每次都会失败。
我整天都在处理这个问题，我已经尝试了我在互联网上找到的所有解决方案，但仍然没有用。
这是我的 build.gradle 文件依赖项
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
}
android {
compileSdk 31
defaultConfig {
applicationId "com.example.myapplication"
minSdk 21
targetSdk 31
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
}
dependencies {
implementation 'org.postgresql:postgresql:42.2.5.jre7'
implementation 'net.sourceforge.jtds:jtds:1.3.1'
implementation 'androidx.core:core-ktx:1.7.0'
implementation 'androidx.appcompat:appcompat:1.4.1'
implementation 'com.google.android.material:material:1.5.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}
这是我的代码
package com.example.myapplication
import android.Manifest
import android.content.pm.PackageManager
import android.os.Bundle
import android.os.StrictMode
import android.os.StrictMode.ThreadPolicy
import android.util.Log
import android.view.View
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import java.sql.Connection
import java.sql.DriverManager
import java.sql.SQLException
var username = "myUsername";
var password = "password";
var url = "jdbc:postgresql://tyke.db.elephantsql.com:5432/myUsername";
private var connection: Connection? = null
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
fun start(view: View?) {
ActivityCompat.requestPermissions(
this,
arrayOf(Manifest.permission.INTERNET),
PackageManager.PERMISSION_GRANTED
)
val policy = ThreadPolicy.Builder().permitAll().build()
StrictMode.setThreadPolicy(policy)
try {
Class.forName("org.postgresql.Driver")
connection = DriverManager.getConnection(url, username, password)
Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show()
Log.d("client","connected")
} catch (e: ClassNotFoundException) {
e.printStackTrace()
Toast.makeText(this, "Class fail", Toast.LENGTH_SHORT).show()
Log.d("client","1 not connected")
} catch (e: SQLException) {
e.printStackTrace()
Log.d("client","2 not connected"+e)
Toast.makeText(this, "Connected no", Toast.LENGTH_SHORT).show()
}
}
}
这是每次都会出现的错误
org.postgresql.util.PSQLException: The connection attempt failed.
我希望得到一点帮助，因为我被困住了，我不知道该怎么做。提前致谢！
*这是错误的完整堆栈跟踪，也许它可以帮助！
2022-05-25 10:28:25.143 20453-20453/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myapplication, PID: 20453
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:446)
at android.view.View.performClick(View.java:7125)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1131)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access00(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:441)
at android.view.View.performClick(View.java:7125)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1131)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access00(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: org.postgresql.util.PSQLException: The connection attempt failed.
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:292)
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49)
at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195)
at org.postgresql.Driver.makeConnection(Driver.java:454)
at org.postgresql.Driver.connect(Driver.java:256)
at java.sql.DriverManager.getConnection(DriverManager.java:580)
at java.sql.DriverManager.getConnection(DriverManager.java:218)
at com.example.myapplication.MainActivity.start(MainActivity.kt:39)
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:441)
at android.view.View.performClick(View.java:7125)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1131)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access00(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: java.net.SocketException: socket failed: EPERM (Operation not permitted)
at java.net.Socket.createImpl(Socket.java:492)
at java.net.Socket.connect(Socket.java:619)
at org.postgresql.core.PGStream.<init>(PGStream.java:70)
at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:91)
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:192)
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49)
at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195)
at org.postgresql.Driver.makeConnection(Driver.java:454)
at org.postgresql.Driver.connect(Driver.java:256)
at java.sql.DriverManager.getConnection(DriverManager.java:580)
at java.sql.DriverManager.getConnection(DriverManager.java:218)
at com.example.myapplication.MainActivity.start(MainActivity.kt:39)
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:441)
at android.view.View.performClick(View.java:7125)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1131)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access00(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
经过几天的挖掘，我终于能够管理我的问题的解决方案。
当您编辑 android 清单时，您必须从模拟器中卸载（手动）您的应用并重新安装。这是使更改确定的唯一方法。
所以，我的问题很简单...如果以后有人遇到同样的情况，亲爱的朋友试试我的解决方案吧！
我开始讨论是因为我对 Android 中正在处理的一个学校项目有一个大问题。 现在我有一个在线服务 ElephantSQL 的免费数据库。
数据库非常完美，因为当我尝试使用 IntelliJIDEA 将它连接到用 java 编写的项目时，一切正常。 但是，如果我尝试在 Android Studio 中使用 Kotlin 编写的代码连接具有相同凭据（IP、用户名、密码等）的数据库，连接每次都会失败。
我整天都在处理这个问题，我已经尝试了我在互联网上找到的所有解决方案，但仍然没有用。
这是我的 build.gradle 文件依赖项
plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
}
android {
compileSdk 31
defaultConfig {
applicationId "com.example.myapplication"
minSdk 21
targetSdk 31
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
}
dependencies {
implementation 'org.postgresql:postgresql:42.2.5.jre7'
implementation 'net.sourceforge.jtds:jtds:1.3.1'
implementation 'androidx.core:core-ktx:1.7.0'
implementation 'androidx.appcompat:appcompat:1.4.1'
implementation 'com.google.android.material:material:1.5.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.3'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}
这是我的代码
package com.example.myapplication
import android.Manifest
import android.content.pm.PackageManager
import android.os.Bundle
import android.os.StrictMode
import android.os.StrictMode.ThreadPolicy
import android.util.Log
import android.view.View
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.core.app.ActivityCompat
import java.sql.Connection
import java.sql.DriverManager
import java.sql.SQLException
var username = "myUsername";
var password = "password";
var url = "jdbc:postgresql://tyke.db.elephantsql.com:5432/myUsername";
private var connection: Connection? = null
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
}
fun start(view: View?) {
ActivityCompat.requestPermissions(
this,
arrayOf(Manifest.permission.INTERNET),
PackageManager.PERMISSION_GRANTED
)
val policy = ThreadPolicy.Builder().permitAll().build()
StrictMode.setThreadPolicy(policy)
try {
Class.forName("org.postgresql.Driver")
connection = DriverManager.getConnection(url, username, password)
Toast.makeText(this, "Connected", Toast.LENGTH_SHORT).show()
Log.d("client","connected")
} catch (e: ClassNotFoundException) {
e.printStackTrace()
Toast.makeText(this, "Class fail", Toast.LENGTH_SHORT).show()
Log.d("client","1 not connected")
} catch (e: SQLException) {
e.printStackTrace()
Log.d("client","2 not connected"+e)
Toast.makeText(this, "Connected no", Toast.LENGTH_SHORT).show()
}
}
}
这是每次都会出现的错误
org.postgresql.util.PSQLException: The connection attempt failed.
我希望得到一点帮助，因为我被困住了，我不知道该怎么做。提前致谢！
*这是错误的完整堆栈跟踪，也许它可以帮助！
2022-05-25 10:28:25.143 20453-20453/com.example.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.myapplication, PID: 20453
java.lang.IllegalStateException: Could not execute method for android:onClick
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:446)
at android.view.View.performClick(View.java:7125)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1131)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access00(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:441)
at android.view.View.performClick(View.java:7125)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1131)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access00(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: org.postgresql.util.PSQLException: The connection attempt failed.
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:292)
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49)
at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195)
at org.postgresql.Driver.makeConnection(Driver.java:454)
at org.postgresql.Driver.connect(Driver.java:256)
at java.sql.DriverManager.getConnection(DriverManager.java:580)
at java.sql.DriverManager.getConnection(DriverManager.java:218)
at com.example.myapplication.MainActivity.start(MainActivity.kt:39)
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:441)
at android.view.View.performClick(View.java:7125)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1131)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access00(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
Caused by: java.net.SocketException: socket failed: EPERM (Operation not permitted)
at java.net.Socket.createImpl(Socket.java:492)
at java.net.Socket.connect(Socket.java:619)
at org.postgresql.core.PGStream.<init>(PGStream.java:70)
at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect(ConnectionFactoryImpl.java:91)
at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl(ConnectionFactoryImpl.java:192)
at org.postgresql.core.ConnectionFactory.openConnection(ConnectionFactory.java:49)
at org.postgresql.jdbc.PgConnection.<init>(PgConnection.java:195)
at org.postgresql.Driver.makeConnection(Driver.java:454)
at org.postgresql.Driver.connect(Driver.java:256)
at java.sql.DriverManager.getConnection(DriverManager.java:580)
at java.sql.DriverManager.getConnection(DriverManager.java:218)
at com.example.myapplication.MainActivity.start(MainActivity.kt:39)
at java.lang.reflect.Method.invoke(Native Method)
at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:441)
at android.view.View.performClick(View.java:7125)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1131)
at android.view.View.performClickInternal(View.java:7102)
at android.view.View.access00(View.java:801)
at android.view.View$PerformClick.run(View.java:27336)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:930)
经过几天的挖掘，我终于能够管理我的问题的解决方案。
当您编辑 android 清单时，您必须从模拟器中卸载（手动）您的应用并重新安装。这是使更改确定的唯一方法。
所以，我的问题很简单...如果以后有人遇到同样的情况，亲爱的朋友试试我的解决方案吧！