我正在尝试将数据(表中的特定列)加载到微调器中。
我创建了一个 DatabaseHelper 类，我在其中定义了数据库/表格，并在其中选择了微调器的数据。
我的类 Allgemein 是我在其中保存微调器数据的类。
我创建了一个 Unterkunft 类，我在其中实现了一个微调器。当我单击此微调器时，应显示来自 Allgemein 类的数据。
每次我在 Allgemein 中保存数据然后尝试打开 Unterkunft Activity 我的应用程序都会崩溃。
我添加了来自 DatabaseHelper 和 Unterkunft 以及 Logcat 的代码。
我希望有人能帮我解决这个问题!! 谢谢
类数据库助手
package com.group6.TakeOff;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import java.util.ArrayList;
import java.util.List;
/**
* Created by STzavelas on 28.06.17.
*/
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME = "TakeOff.db";
//Table Names
public static final String TABLE_PROJEKT = "create_project";
public static final String TABLE_UNTERKUNFT = "unterkunft";
public static final String TABLE_AUTO = "auto";
public static final String TABLE_FLUGZEUG = "flugzeug";
public static final String TABLE_TAXI = "taxi";
public static final String TABLE_BAHN = "bahn";
//Common column names
public static final String KEY_ID = "ID";
public static final String KEY_PROJECT = "PROJEKT";
//create project column names
public static final String KEY_DATE_FROM= "DATE_FROM";
public static final String KEY_DATE_TO= "DATE_TO";
public static final String KEY_NAME = "NACHNAME";
public static final String KEY_VORNAME = "VORNAME";
public static final String KEY_KOSTENST = "KOSTENSTELLE";
//Expenses column names
public static final String KEY_ENTFERNUNG= "ENTFERNUNG";
public static final String KEY_PRICE= "PRICE";
public static final String KEY_MWST= "MWST";
public static final String KEY_RECHNUNG_IMG= "RECHNUNG_IMG";
//Übersicht column names
//TABLE CREATE STATEMENTS
private static final String CREATE_TABLE_PROJEKT = "create table " + TABLE_PROJEKT + "(ID INTEGER PRIMARY KEY AUTOINCREMENT, " +
"PROJEKT TEXT, " +
"DATE_FROM TEXT, " +
"DATE_TO TEXT, " +
"NACHNAME TEXT, " +
"VORNAME TEXT, " +
"KOSTENSTELLE TEXT)";
private static final String CREATE_TABLE_UNTERKUNFT = "create table " + TABLE_UNTERKUNFT +
"(ID INTEGER PRIMARY KEY AUTOINCREMENT, " +
"PROJEKT TEXT, " +
"ENTFERNUNG INT, " +
"PRICE INT, " +
"MWST INT)";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(CREATE_TABLE_PROJEKT);
db.execSQL(CREATE_TABLE_UNTERKUNFT);
//db.execSQL(CREATE_TABLE_AUTO);
//db.execSQL(CREATE_TABLE_FLUGZEUG);
//db.execSQL(CREATE_TABLE_BAHN);
//db.execSQL(CREATE_TABLE_TAXI);
}
@Override
public void onUpgrade(SQLiteDatabase db, int i, int i1) {
db.execSQL("DROP TABLE IF EXISTS " + TABLE_PROJEKT);
db.execSQL("DROP TABLE IF EXISTS " + TABLE_UNTERKUNFT);
onCreate(db);
}
//+++++++++++++CREATE A PROJECT++++++++++++//
public boolean createProject(String project, String date_from, String date_to, String name, String vorname, String kostenstelle){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(KEY_PROJECT, project);
contentValues.put(KEY_DATE_FROM, date_from);
contentValues.put(KEY_DATE_TO, date_to);
contentValues.put(KEY_NAME, name);
contentValues.put(KEY_VORNAME, vorname);
contentValues.put(KEY_KOSTENST, kostenstelle);
long result = db.insert(TABLE_PROJEKT,null,contentValues);
if(result == -1)
return false;
else
return true;
}
//+++++++++++++CREATE A UNTERKUNFT++++++++++++//
public boolean createUnterkunft(String project, String date_from, String date_to, String name, String vorname, String kostenstelle){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues contentValues = new ContentValues();
contentValues.put(KEY_PROJECT, project);
contentValues.put(KEY_DATE_FROM, date_from);
contentValues.put(KEY_DATE_TO, date_to);
contentValues.put(KEY_NAME, name);
contentValues.put(KEY_VORNAME, vorname);
contentValues.put(KEY_KOSTENST, kostenstelle);
long result = db.insert(TABLE_PROJEKT,null,contentValues);
if(result == -1)
return false;
else
return true;
}
//Getting values from spinner (Drop-Down)
public List<String> getAllProjects(){
List<String> projects = new ArrayList<String>();
String selectQuery = "SELECT " + KEY_PROJECT + "FROM " + TABLE_PROJEKT;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(selectQuery,null);
if (cursor.moveToFirst()) {
do {
projects.add(cursor.getString(1));
} while (cursor.moveToNext());
}
// closing connection
cursor.close();
db.close();
// returning lables
return projects;
}
}
地下艺术类
package com.group6.TakeOff;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.BottomNavigationView;
import android.support.v7.app.AppCompatActivity;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;
import android.widget.ArrayAdapter;;
import java.util.List;
/**
* Created by STzavelas on 24.06.17.
*/
public class activity_unterkunft extends AppCompatActivity {
DatabaseHelper myDb;
Button btn_save;
Spinner ChooseProject;
EditText Entfernung,Price,MWST;
private BottomNavigationView bottomNavigationView;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_unterkunft);
myDb = new DatabaseHelper(this);
ChooseProject = (Spinner) findViewById(R.id.ChooseProject);
Entfernung = (EditText) findViewById(R.id.Entfernung);
Price = (EditText) findViewById(R.id.Preis);
MWST = (EditText) findViewById(R.id.MwSt);
btn_save=(Button) findViewById(R.id.btn_save);
//ChooseProject.setOnItemSelectedListener(this);
loadSpinnerData();
//SaveData();
//++++++++++++BOTTOM NAVIGATION BAR++++++++++++//
bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottomNavigationView);
bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener(){
@Override
public boolean onNavigationItemSelected(@NonNull MenuItem item){
if (item.getItemId()==R.id.menu_start){
startActivity(new Intent(activity_unterkunft.this, MainActivity.class));
} else if(item.getItemId()==R.id.menu_allgemein){
startActivity(new Intent(activity_unterkunft.this, activity_allgemein.class));
} else if(item.getItemId()==R.id.menu_transport){
startActivity(new Intent(activity_unterkunft.this, activity_transport.class));
} else if(item.getItemId()==R.id.menu_rechnung){
startActivity(new Intent(activity_unterkunft.this, activity_rechnung.class));
} else if(item.getItemId()==R.id.menu_unterkunft){
startActivity(new Intent(activity_unterkunft.this, activity_unterkunft.class));
}
return true;
}
});
bottomNavigationView.setSelectedItemId(R.id.menu_unterkunft);
}
/**
* Function to load the spinner data from SQLite database
* */
private void loadSpinnerData() {
// database handler
DatabaseHelper db = new DatabaseHelper (getApplicationContext());
// Spinner Drop down elements
List<String> projects = db.getAllProjects();
// Creating adapter for spinner
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, projects);
// Drop down layout style - list view with radio button
dataAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
ChooseProject.setAdapter(dataAdapter);
}
}
来自 logcat 的运行时异常:
8-04 15:09:28.193 10721-10721/com.group6.travlhoe E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.group6.travlhoe, PID: 10721
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.group6.travlhoe/com.group6.TakeOff.activity_unterkunft}: java.lang.IllegalStateException: Couldn't read row 0, col 1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6540)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.IllegalStateException: Couldn't read row 0, col 1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
at android.database.CursorWindow.nativeGetString(Native Method)
at android.database.CursorWindow.getString(CursorWindow.java:438)
at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
at com.group6.TakeOff.DatabaseHelper.getAllProjects(DatabaseHelper.java:141)
at com.group6.TakeOff.activity_unterkunft.loadSpinnerData(activity_unterkunft.java:77)
at com.group6.TakeOff.activity_unterkunft.onCreate(activity_unterkunft.java:41)
at android.app.Activity.performCreate(Activity.java:6980)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6540)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
08-04 15:09:29.375 1518-1531/? E/memtrack: Couldn't load memtrack module
08-04 15:09:30.634 1518-1575/? E/InputDispatcher: channel '160c8 com.group6.travlhoe/com.group6.TakeOff.activity_unterkunft (server)' ~ Channel is unrecoverably broken and will be disposed!
08-04 15:09:30.634 1518-1575/? E/InputDispatcher: channel '8a33e37 com.group6.travlhoe/com.group6.TakeOff.activity_allgemein (server)' ~ Channel is unrecoverably broken and will be disposed!
08-04 15:09:30.636 1518-1575/? E/InputDispatcher: channel '32f6f4d com.group6.travlhoe/com.group6.TakeOff.MainActivity (server)' ~ Channel is unrecoverably broken and will be disposed!
08-04 15:09:30.703 1349-1368/? E/SurfaceFlinger: Failed to find layer (com.group6.travlhoe/com.group6.TakeOff.activity_allgemein#0) in layer parent (no-parent).
08-04 15:09:30.732 11098-11105/? E/zygote: Failed sending reply to debugger: Broken pipe
08-04 15:09:30.753 1518-2450/? E/ActivityManager: applyOptionsLocked: Unknown animationType=0
08-04 15:09:31.387 11098-11098/? E/CursorWindow: Failed to read row 0, column 1 from a CursorWindow which has 1 rows, 1 columns.
08-04 15:09:31.389 11098-11098/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.group6.travlhoe, PID: 11098
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.group6.travlhoe/com.group6.TakeOff.activity_unterkunft}: java.lang.IllegalStateException: Couldn't read row 0, col 1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6540)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.IllegalStateException: Couldn't read row 0, col 1 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it.
at android.database.CursorWindow.nativeGetString(Native Method)
at android.database.CursorWindow.getString(CursorWindow.java:438)
at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
at com.group6.TakeOff.DatabaseHelper.getAllProjects(DatabaseHelper.java:141)
at com.group6.TakeOff.activity_unterkunft.loadSpinnerData(activity_unterkunft.java:77)
at com.group6.TakeOff.activity_unterkunft.onCreate(activity_unterkunft.java:41)
at android.app.Activity.performCreate(Activity.java:6980)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
at android.app.ActivityThread.-wrap11(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6540)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
08-04 15:09:31.563 1518-1606/? E/TaskPersister: File error accessing recents directory (directory doesn't exist?).
08-04 15:09:32.694 1518-1528/? E/ActivityManager: Found activity ActivityRecord{1e06b4f u0 com.group6.travlhoe/com.group6.TakeOff.activity_unterkunft t-1 f} in proc activity list using null instead of expected ProcessRecord{9c4d79f 11098:com.group6.travlhoe/u0a86}
08-04 15:09:33.051 1415-1496/? E/AudioFlinger: not enough memory for AudioTrack size=131296
08-04 15:09:33.052 1415-1496/? E/AudioFlinger: createRecordTrack_l() initCheck failed -12; no control block?
08-04 15:09:33.054 2179-10736/? E/AudioRecord: AudioFlinger could not create record track, status: -12
08-04 15:09:33.093 2179-10736/? E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -12.
08-04 15:09:33.093 2179-10736/? E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
最佳答案
在您选择的查询字符串中，FROM 之前需要一个空格:
String selectQuery = "SELECT " + KEY_PROJECT + " FROM " + TABLE_PROJEKT;
^
HERE
查看 logcat 中的 SQLiteException:
Caused by: SQLiteException: no such column: PROJEKTFROM (code 1):
进行上述更改后崩溃:
在您的选择语句中，您选择的是一列:
String selectQuery = "SELECT " + KEY_PROJECT + " FROM " + TABLE_PROJEKT;
但是在访问游标中的数据时:
projects.add(cursor.getString(1));
现在游标索引是从零开始的，你没有第 1 列只有第 0 列。
关于java - 使用来自 sqlite 数据库的数据填充微调器 - 应用程序崩溃，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/45507591/
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