我试图在ma app中进行注册活动，我想在用户输入学生ID时查看学生ID是否在数据库中，如果是，请注册 它说错了......所以我有错误...... 这是logcat后面的代码
EditText st_id , st_pass, Pass_again;
String student_id ,pass_ag ,pass;
Button regs, cancel_reg;
Context cxt,cxt2;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.registor);
st_id=(EditText)findViewById(R.id.st_id);
st_pass=(EditText)findViewById(R.id.st_pass);
Pass_again=(EditText)findViewById(R.id.pass_again);
cxt=this;
regs=(Button)findViewById (R.id.regs) ;
cancel_reg=(Button) findViewById(R.id.cancel_reg);
regs.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
student_id=st_id.getText().toString();
pass=st_pass.getText().toString();
pass_ag=Pass_again.getText().toString();
Getdata info = new Getdata (cxt);
info.open();
String data=info.getdata();
Cursor CR=info.getdata(cxt2);
info.close();
CR.moveToFirst();
/*if(!(pass.equals(pass_ag) && (student_id.equals(CR.getString(0)))))
{
Toast.makeText(getBaseContext(), "Password not match /n or student id not found", Toast.LENGTH_LONG).show();
st_id.setText("");
st_pass.setText("");
Pass_again.setText("");
}
else
{
DataBaseopretions db =new DataBaseopretions(cxt);
db.putinformation(db, student_id, pass , pass_ag);
Toast.makeText(getBaseContext(), "Registrtion success", Toast.LENGTH_LONG).show();
finish();
}
}
});*/
CR.moveToFirst();
boolean loginstatus=false;
String student = "";
do{
if(!(pass.equals(pass_ag) && (student_id.equals(CR.getString(0))))){
loginstatus=true;
student=CR.getString(0);
}
}while(CR.moveToNext());
if(loginstatus)
{
Toast.makeText(getBaseContext(), "Rigstretion sucsess--- \n Welcome"+ student, Toast.LENGTH_LONG).show();
Intent i= new Intent(Rigstretion.this ,Student_pag.class);
startActivity(i);
}
else
{
Toast.makeText(getBaseContext(), "Rigstretion failed--- wrong student id or password doesn't match", Toast.LENGTH_LONG).show();
finish();
}
}
});
cancel_reg.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
student_id=" ";
pass=" ";
pass_ag=" ";
finish();
}
});
}
}
logcat的
11-01 18:54:51.204: E/AndroidRuntime(28496): FATAL EXCEPTION: main
11-01 18:54:51.204: E/AndroidRuntime(28496): java.lang.IllegalStateException: Cannot perform this operation because the connection pool has been closed.
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.database.sqlite.SQLiteConnectionPool.throwIfClosedLocked(SQLiteConnectionPool.java:962)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.database.sqlite.SQLiteConnectionPool.waitForConnection(SQLiteConnectionPool.java:599)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.database.sqlite.SQLiteConnectionPool.acquireConnection(SQLiteConnectionPool.java:348)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.database.sqlite.SQLiteSession.acquireConnection(SQLiteSession.java:894)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.database.sqlite.SQLiteSession.executeForCursorWindow(SQLiteSession.java:834)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.database.sqlite.SQLiteQuery.fillWindow(SQLiteQuery.java:62)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:143)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.database.sqlite.SQLiteCursor.getCount(SQLiteCursor.java:133)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.database.AbstractCursor.moveToPosition(AbstractCursor.java:196)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.database.AbstractCursor.moveToFirst(AbstractCursor.java:236)
11-01 18:54:51.204: E/AndroidRuntime(28496): at za.example.drawer.Rigstretion$1.onClick(Rigstretion.java:43)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.view.View.performClick(View.java:4084)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.view.View$PerformClick.run(View.java:16966)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.os.Handler.handleCallback(Handler.java:615)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.os.Handler.dispatchMessage(Handler.java:92)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.os.Looper.loop(Looper.java:137)
11-01 18:54:51.204: E/AndroidRuntime(28496): at android.app.ActivityThread.main(ActivityThread.java:4745)
11-01 18:54:51.204: E/AndroidRuntime(28496): at java.lang.reflect.Method.invokeNative(Native Method)
11-01 18:54:51.204: E/AndroidRuntime(28496): at java.lang.reflect.Method.invoke(Method.java:511)
11-01 18:54:51.204: E/AndroidRuntime(28496): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
11-01 18:54:51.204: E/AndroidRuntime(28496): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
11-01 18:54:51.204: E/AndroidRuntime(28496): at dalvik.system.NativeStart.main(Native Method)
11-01 18:54:51.208: W/ActivityManager(325): Force finishing activity za.example.drawer/.Rigstretion
11-01 18:54:51.256: E/SocketStream(111): readFully was waiting for 275772 bytes, got 49152
11-01 18:54:51.260: E/SocketStream(111): readFully was waiting for 226620 bytes, got 49152
11-01 18:54:51.260: E/SocketStream(111): readFully was waiting for 177468 bytes, got 49152
11-01 18:54:51.264: E/SocketStream(111): readFully was waiting for 128316 bytes, got 16384
11-01 18:54:51.276: W/audio_hw_primary(114): out_write() limiting sleep time 58911 to 39909
11-01 18:54:51.776: W/ActivityManager(325): Activity pause timeout for ActivityRecord{5355d548 za.example.drawer/.Rigstretion}
11-01 18:55:01.276: W/ActivityManager(325): Launch timeout has expired, giving up wake lock!
11-01 18:55:01.780: W/ActivityManager(325): Activity idle timeout for ActivityRecord{5351228c za.example.drawer/.MainActivity}
所以任何人都可以帮助我???
答案 0 :(得分：0)
info.close(); //remove this line
CR.moveToFirst();
如果我正确理解您的代码，您会遇到异常，因为您尝试在关闭数据库后执行操作。尝试删除info.close();并仅在完成操作后关闭数据库。 （也许在do-while完成之后，在你的情况下）