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Android改变表列现在使程序崩溃。java.lang.NumberFormatException:无效的int:"；"；

java android eclipse sqlite

Android改变表列现在使程序崩溃。java.lang.NumberFormatException:无效的int:"；"；,java,android,eclipse,sqlite,Java,Android,Eclipse,Sqlite,我正在改变我的数据库结构，因为我注意到有些东西顺序不对。这样做之后，它会闪现一个错误，说 02-10 19:42:06.562: E/AndroidRuntime(1215): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.project/com.example.project.MainActivity}: java.lang.NumberFormatException: Invali

我正在改变我的数据库结构，因为我注意到有些东西顺序不对。这样做之后，它会闪现一个错误，说

02-10 19:42:06.562: E/AndroidRuntime(1215): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.project/com.example.project.MainActivity}: java.lang.NumberFormatException: Invalid int: "T"
“T”是我对以前的测试数据使用的，所以我假设数据库中已经存在以前的数据，现在随着列的变化而标记错误

我认为如果我在onCreate（）的一开始就删除了数据库，那么它就会清除数据库，插入新的测试数据，并消除错误。然而，我仍然得到完全相同的错误

完整代码如下：

MainActivity.java

public class MainActivity extends Activity {

    Intent appIntent;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main); 
        DB db = new DB(this);
        db.insertStudent("Matt", "male", 22, "password", "computing", "modules");
        List<tableStudents> outputList = db.getData();    
        for (tableStudents student: outputList) {
            // Log your results.
            Log.d("result_list", student.toString());
        }

    }

    public void goHomepage(View v)
    {
        Intent intent = new Intent(MainActivity.this, Homepage.class);
        startActivity(intent);
    }
    public void goAccount(View v)
    {
        Intent intent = new Intent(MainActivity.this, MyAccount.class);
        startActivity(intent);
    }   

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();
        if (id == R.id.action_settings) {
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

public class DB extends SQLiteOpenHelper {
public static final int db_version = 1;  
public static final String Table = "Students";  
public static final String Student_ID = "Student_ID";
public static final String Student_Name = "Student_Name";
public static final String Student_Password = "Student_Password";
public static final String Student_Gender = "gender";
public static final String Student_Age = "age";
public static final String Student_Course = "course";
public static final String Modules = "modules";
public DB(Context context) {
    super(context, tableColumns.Database, null, db_version);
}

@Override
public void onCreate(SQLiteDatabase db) {
    delete(db);
    //Create Table
    db.execSQL("CREATE TABLE " + Table + "(" + 
            Student_ID + " INTEGER PRIMARY KEY, " +
            Student_Name + " TEXT, " +
            Student_Password + " TEXT, " +
            Student_Gender + " TEXT, " +
            Student_Age + " INTEGER, " +
            Student_Course + " TEXT, " +
            Modules + " TEXT)");
    Log.d("DB", "DB Created");      
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    db.execSQL("DROP TABLE IF EXISTS " + Table);
    onCreate(db);
}

public void delete(SQLiteDatabase db)
{
    db.delete(Table, null, null);       
}

public List<tableStudents> getData() {
    List<tableStudents> studentList = new ArrayList<tableStudents>();
    // Select All Query
    String selectQuery = "SELECT  * FROM " + Table;

    SQLiteDatabase db = this.getWritableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);

    // looping through all rows and adding to list
    if (cursor.moveToFirst()) {
        do {
            tableStudents student = new tableStudents();
            student.name = cursor.getString(0);
            student.gender = cursor.getString(1);
            student.age = Integer.parseInt(cursor.getString(2));
            student.password = cursor.getString(3);
            student.course = cursor.getString(4);
            student.modules = cursor.getString(5);
            studentList.add(student);
        } while (cursor.moveToNext());
    }

    // return contact list
    return studentList;

}


public boolean insertStudent(String name, String gender, int age, String password, String course, String modules) {

    SQLiteDatabase db = getWritableDatabase();

    ContentValues contentValues = new ContentValues();
    contentValues.put(Student_Name, name);
    contentValues.put(Student_Password, password);
    contentValues.put(Student_Gender, gender);
    contentValues.put(Student_Age, age);        
    contentValues.put(Student_Course, course);
    contentValues.put(Modules, modules);
    db.insert(Table, null, contentValues);
    Log.d("DB", "Inserted Successfully");
    return true;
}

}
LogCat

02-10 19:56:42.132: D/DB(1741): Inserted Successfully
02-10 19:56:42.142: D/AndroidRuntime(1741): Shutting down VM
02-10 19:56:42.147: E/AndroidRuntime(1741): FATAL EXCEPTION: main
02-10 19:56:42.147: E/AndroidRuntime(1741): Process: com.example.project, PID: 1741
02-10 19:56:42.147: E/AndroidRuntime(1741): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.project/com.example.project.MainActivity}: java.lang.NumberFormatException: Invalid int: "T"
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.ActivityThread.access$800(ActivityThread.java:151)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.os.Handler.dispatchMessage(Handler.java:102)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.os.Looper.loop(Looper.java:135)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.ActivityThread.main(ActivityThread.java:5257)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at java.lang.reflect.Method.invoke(Native Method)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at java.lang.reflect.Method.invoke(Method.java:372)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
02-10 19:56:42.147: E/AndroidRuntime(1741): Caused by: java.lang.NumberFormatException: Invalid int: "T"
02-10 19:56:42.147: E/AndroidRuntime(1741):     at java.lang.Integer.invalidInt(Integer.java:138)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at java.lang.Integer.parse(Integer.java:410)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at java.lang.Integer.parseInt(Integer.java:367)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at java.lang.Integer.parseInt(Integer.java:334)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at com.example.project.DB.getData(DB.java:72)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at com.example.project.MainActivity.onCreate(MainActivity.java:31)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.Activity.performCreate(Activity.java:5990)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
您是否已尝试删除应用程序的数据，然后再次运行它？

请在onCreate（）的开头尝试此操作：

我该怎么做呢？我现在就发布我的整个日志，不复杂，只需打开设置，转到应用程序，选择你的应用程序并清除其数据。我的意思是在Eclipse上，我现在没有访问Android手机的权限。你也可以运行deleteDatabase（“数据库名称”）在活动中或卸载应用程序时，我已尝试将其放入db.java中的onCreate中，但没有成功。恐怕这不起作用，-类型db的方法deleteDatabase（SQLiteDatabase）未定义 
02-10 19:56:42.132: D/DB(1741): Inserted Successfully
02-10 19:56:42.142: D/AndroidRuntime(1741): Shutting down VM
02-10 19:56:42.147: E/AndroidRuntime(1741): FATAL EXCEPTION: main
02-10 19:56:42.147: E/AndroidRuntime(1741): Process: com.example.project, PID: 1741
02-10 19:56:42.147: E/AndroidRuntime(1741): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.project/com.example.project.MainActivity}: java.lang.NumberFormatException: Invalid int: "T"
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.ActivityThread.access$800(ActivityThread.java:151)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.os.Handler.dispatchMessage(Handler.java:102)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.os.Looper.loop(Looper.java:135)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.ActivityThread.main(ActivityThread.java:5257)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at java.lang.reflect.Method.invoke(Native Method)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at java.lang.reflect.Method.invoke(Method.java:372)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
02-10 19:56:42.147: E/AndroidRuntime(1741): Caused by: java.lang.NumberFormatException: Invalid int: "T"
02-10 19:56:42.147: E/AndroidRuntime(1741):     at java.lang.Integer.invalidInt(Integer.java:138)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at java.lang.Integer.parse(Integer.java:410)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at java.lang.Integer.parseInt(Integer.java:367)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at java.lang.Integer.parseInt(Integer.java:334)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at com.example.project.DB.getData(DB.java:72)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at com.example.project.MainActivity.onCreate(MainActivity.java:31)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.Activity.performCreate(Activity.java:5990)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
02-10 19:56:42.147: E/AndroidRuntime(1741):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)

deleteDatabase("your_db_name");