每次我运行我的代码时，我都会在我的 logcat 中得到这个，并且无法弄清楚如何修复它。当我更新时出现此错误，我在删除时使用类似的代码并且效果很好。我在更新中使用了断点，它一直持续到函数的末尾。我以为在 startActivityForResult 会转到下一页，但事实并非如此。startActivityForResult 完全相同的代码在另一个函数中工作
这是更新的代码
public void edit_to_report_page(final View v) {
LayoutInflater inflater = LayoutInflater.from(this);
View addView = inflater.inflate(R.layout.new_vehicle, null);
idNum = (EditText) addView.findViewById(R.id.deleteRecord);
new AlertDialog.Builder(this)
.setTitle("Edit a report")
.setMessage("Enter the Id number of the report to edit")
.setView(addView)
.setPositiveButton("Edit",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
String id = idNum.getText().toString();
uniqueID = Long.parseLong(id);
newID(uniqueID);
info.open();
try {
boolean correctNumber = info
.Exists(uniqueID);
if (!correctNumber) {
Toast.makeText(getApplicationContext(),
"Number not found",
Toast.LENGTH_SHORT).show();
info.close();
}else{
info.close();
intent = new Intent(v.getContext(),
report.class);
startActivityForResult(intent, 0);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
}
}).show();
}
这是有效的删除代码
public void delete_db(View v) {
LayoutInflater inflater = LayoutInflater.from(this);
View addView = inflater.inflate(R.layout.new_vehicle, null);
idNum = (EditText) addView.findViewById(R.id.deleteRecord);
final Dialog d = new Dialog(this);
final TextView tv = new TextView(this);
new AlertDialog.Builder(this)
.setTitle("Delete a report")
.setMessage("Enter the Id number of the report to delete")
.setView(addView)
.setPositiveButton("Delete",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
String id = idNum.getText().toString();
long primaryId = Long.parseLong(id);
info.open();
try {
boolean inCorrectNumber = info
.deleteInspection(primaryId);
if (inCorrectNumber) {
Toast.makeText(getApplicationContext(),
"Number not found",
Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
info.close();
dbInfo();
}
})
.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
}
}).show();
}
这是我的 dbAdapter 中用于删除和存在（更新）的代码
public boolean Exists(long _id)throws Exception
{
Cursor c = db.query(DB_TABLE, new String[] { KEY_ROWID},
"_id=" + _id, null, null, null, null);
boolean exists=(c.getCount()>0);
c.close();
return exists;
}
public boolean deleteInspection(long _id)throws Exception
{
int numResults = 0;
numResults = db.delete(DB_TABLE,"_id=" + _id , null);
return (numResults < 1);
}
这是我在 logcat 中得到的
04-10 09:47:05.006: E/CursorWindow(2961): 对字段槽 0,-1 的错误请求。numRows = 1，numColumns = 1
04-10 09:47:05.016: D/AndroidRuntime(2961): 关闭 VM
04-10 09:47:05.027: W/dalvikvm(2961): threadid=1: 线程以未捕获的异常退出 (group=0x4001d800)
04-10 09:47:05.046：E/AndroidRuntime（2961）：致命异常：主要
04-10 09:47:05.046: E/AndroidRuntime(2961): java.lang.RuntimeException: 无法启动活动 ComponentInfo{com.signalsetapp/com.signalsetapp.inspectionchecklist.report}: java.lang.IllegalStateException: 获取字段槽从第 0 行 col -1 失败
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 android.app.ActivityThread.access$2300(ActivityThread.java:125)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 android.os.Handler.dispatchMessage(Handler.java:99)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 android.os.Looper.loop(Looper.java:123)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 android.app.ActivityThread.main(ActivityThread.java:4627)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 java.lang.reflect.Method.invokeNative(Native Method)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 java.lang.reflect.Method.invoke(Method.java:521)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-10 09:47:05.046: E/AndroidRuntime(2961): at dalvik.system.NativeStart.main(Native Method)
04-10 09:47:05.046: E/AndroidRuntime(2961): 由: java.lang.IllegalStateException: 从行 0 col -1 获取字段槽失败
04-10 09:47:05.046: E/AndroidRuntime(2961): at android.database.CursorWindow.getString_native(Native Method)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 android.database.CursorWindow.getString(CursorWindow.java:329)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:49)
04-10 09:47:05.046: E/AndroidRuntime(2961): at com.signalsetapp.inspectionchecklist.report.getInfoFromDB(report.java:129)
04-10 09:47:05.046: E/AndroidRuntime(2961): at com.signalsetapp.inspectionchecklist.report.onCreate(report.java:111)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
04-10 09:47:05.046: E/AndroidRuntime(2961): 在 android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
04-10 09:47:05.046: E/AndroidRuntime(2961): ... 11 更多