我是Android Studio的新手，我正在尝试创建一个必须从数据库中读取信息的应用程序。我已经创建了一个数据库，现在我正在尝试将它连接到我的应用程序。但它崩溃了。如果有人能帮助我，我将非常感激。谢谢！使用Java，eclipse中的连接没有问题。
这是我的代码：
package com.example.sergey.autohuttererapp;
import android.inputmethodservice.KeyboardView;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import java.sql.*;
public class MainActivity extends AppCompatActivity {
private final static String url = "myurl;
private final static String user = "myuser";
private final static String pass = "mypass";
private TextView name, vorname, email, telefon, vertragnmr, datum, person, status;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
name = (TextView) findViewById(R.id.idName);
vorname = (TextView) findViewById(R.id.idVorname);
email = (TextView) findViewById(R.id.idEmail);
telefon = (TextView) findViewById(R.id.idTelefon);
vertragnmr = (TextView) findViewById(R.id.idVertragnmr);
datum = (TextView) findViewById(R.id.idDatum);
person = (TextView) findViewById(R.id.idPerson);
status = (TextView) findViewById(R.id.idStatus);
Button buttonex = (Button) findViewById(R.id.idExec);
buttonex.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
new myTask().execute();
}
});
}
private class myTask extends AsyncTask<Void, Void, Void>{
private String sname = "";
private String svorname = "";
private String semail = "";
private String sdatum = "";
private String sperson = "";
private String sstatus = "";
private int itelefon = 0;
private int ivertragnmr = 0;
@Override
protected Void doInBackground(Void... arg) {
try {
DriverManager.registerDriver (new oracle.jdbc.OracleDriver());
Connection con;
con = DriverManager.getConnection(url, user, pass);
Statement stmt;
stmt = con.createStatement();
String sqlstmt = "Select * from KUNDEN where ID = 4";
final ResultSet rs = stmt.executeQuery(sqlstmt);
rs.next();
sname = rs.getString("NAME");
svorname = rs.getString("VORNAME");
semail = rs.getString("EMAIL");
sperson = rs.getString("PERSON");
sstatus = rs.getString("STATUS");
itelefon = rs.getInt("TELEFON");
ivertragnmr = rs.getInt("VRTNUMMER");
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute (Void result){
name.setText(sname);
vorname.setText(svorname);
email.setText(semail);
telefon.setText(itelefon);
vertragnmr.setText(ivertragnmr);
person.setText(sperson);
status.setText(sstatus);
super.onPostExecute(result);
}
}
}
这是日志：
java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:318)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:762)
Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Loracle/jdbc/driver/BlockSource$ThreadedCachingBlockSource$BlockReleaserListener;
at oracle.jdbc.driver.BlockSource$ThreadedCachingBlockSource.<clinit>(BlockSource.java:402)
at oracle.jdbc.driver.BlockSource$ThreadedCachingBlockSource.createBlockSource(BlockSource.java:429)
at oracle.jdbc.driver.BlockSource.createBlockSource(BlockSource.java:80)
at oracle.jdbc.driver.BlockSource.createBlockSource(BlockSource.java:70)
at oracle.jdbc.driver.PhysicalConnection.setBlockSource(PhysicalConnection.java:656)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:699)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:385)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:30)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:564)
at java.sql.DriverManager.getConnection(DriverManager.java:569)
at java.sql.DriverManager.getConnection(DriverManager.java:219)
at com.example.sergey.autohuttererapp.MainActivity$myTask.doInBackground(MainActivity.java:59)
at com.example.sergey.autohuttererapp.MainActivity$myTask.doInBackground(MainActivity.java:42)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:762)
Caused by: java.lang.ClassNotFoundException: oracle.jdbc.driver.BlockSource$ThreadedCachingBlockSource$BlockReleaserListener
at java.lang.VMClassLoader.findLoadedClass(Native Method)
at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:742)
at java.lang.ClassLoader.loadClass(ClassLoader.java:362)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at oracle.jdbc.driver.BlockSource$ThreadedCachingBlockSource.<clinit>(BlockSource.java:402)
at oracle.jdbc.driver.BlockSource$ThreadedCachingBlockSource.createBlockSource(BlockSource.java:429)
at oracle.jdbc.driver.BlockSource.createBlockSource(BlockSource.java:80)
at oracle.jdbc.driver.BlockSource.createBlockSource(BlockSource.java:70)
at oracle.jdbc.driver.PhysicalConnection.setBlockSource(PhysicalConnection.java:656)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:699)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:385)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:30)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:564)
at java.sql.DriverManager.getConnection(DriverManager.java:569)
at java.sql.DriverManager.getConnection(DriverManager.java:219)
at com.example.sergey.autohuttererapp.MainActivity$myTask.doInBackground(MainActivity.java:59)
at com.example.sergey.autohuttererapp.MainActivity$myTask.doInBackground(MainActivity.java:42)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:762)
Caused by: java.lang.NoClassDefFoundError: Failed resolution of: Ljavax/management/NotificationListener;
at oracle.jdbc.driver.BlockSource$ThreadedCachingBlockSource.<clinit>(BlockSource.java:402)
at oracle.jdbc.driver.BlockSource$ThreadedCachingBlockSource.createBlockSource(BlockSource.java:429)
at oracle.jdbc.driver.BlockSource.createBlockSource(BlockSource.java:80)
at oracle.jdbc.driver.BlockSource.createBlockSource(BlockSource.java:70)
at oracle.jdbc.driver.PhysicalConnection.setBlockSource(PhysicalConnection.java:656)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:699)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:385)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:30)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:564)
at java.sql.DriverManager.getConnection(DriverManager.java:569)
at java.sql.DriverManager.getConnection(DriverManager.java:219)
at com.example.sergey.autohuttererapp.MainActivity$myTask.doInBackground(MainActivity.java:59)
at com.example.sergey.autohuttererapp.MainActivity$myTask.doInBackground(MainActivity.java:42)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:762)
Caused by: java.lang.ClassNotFoundException: Didn't find class "javax.management.NotificationListener" on path: DexPathList[[zip file "/data/app/com.example.sergey.autohuttererapp-1/base.apk"],nativeLibraryDirectories=[/data/app/com.example.sergey.autohuttererapp-1/lib/arm64, /system/lib64, /vendor/lib64]]
at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
at java.lang.ClassLoader.loadClass(ClassLoader.java:380)
at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
at oracle.jdbc.driver.BlockSource$ThreadedCachingBlockSource.<clinit>(BlockSource.java:402)
at oracle.jdbc.driver.BlockSource$ThreadedCachingBlockSource.createBlockSource(BlockSource.java:429)
at oracle.jdbc.driver.BlockSource.createBlockSource(BlockSource.java:80)
at oracle.jdbc.driver.BlockSource.createBlockSource(BlockSource.java:70)
at oracle.jdbc.driver.PhysicalConnection.setBlockSource(PhysicalConnection.java:656)
at oracle.jdbc.driver.PhysicalConnection.<init>(PhysicalConnection.java:699)
at oracle.jdbc.driver.T4CConnection.<init>(T4CConnection.java:385)
at oracle.jdbc.driver.T4CDriverExtension.getConnection(T4CDriverExtension.java:30)
at oracle.jdbc.driver.OracleDriver.connect(OracleDriver.java:564)
at java.sql.DriverManager.getConnection(DriverManager.java:569)
at java.sql.DriverManager.getConnection(DriverManager.java:219)
at com.example.sergey.autohuttererapp.MainActivity$myTask.doInBackground(MainActivity.java:59)
at com.example.sergey.autohuttererapp.MainActivity$myTask.doInBackground(MainActivity.java:42)
at android.os.AsyncTask$2.call(AsyncTask.java:304)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
at java.lang.Thread.run(Thread.java:762)