更新或从数据库中删除时出错; “无法执行方法”

该解决方案在我的文章底部。更新或从数据库中删除时出错; “无法执行方法”

首先，让我道歉这篇文章的长度，但我一直在为代码浇注了几个小时，我迷路了。我也很困惑的数据库方面，所以我的代码复制了一些最简单的教程，我可以找到，即使我知道方面不推荐使用或有其他方法可以减少代码长度。我不确定需要或不需要，因此下面的代码量很大。

目标：我有一个表格，用户可以填写并保存到数据库表中。然后，我将这些数据在另一个类中显示给一个ListView（这个类在ListView上还有其他的功能）。通过单击其中一个列表视图项目，另一个窗体打开，看起来与原始窗体相同，所有信息都已从数据库行填充。此表单有一个保存和删除按钮，可以让您更改某些输入字段（EditText和Spinner's）并保存以更新该行，或者选择删除。更新或删除后，活动结束并将您带回到listview类。

我不会打扰添加原始表单数据，因为我知道这是正确保存。我也知道，我的数据是正确转移到二级形式（一个我可以修改/从删除），但试图更新或删除时，在我的logcat我得到如下：

07-29 04:18:25.771: E/AndroidRuntime(2116): FATAL EXCEPTION: main 
07-29 04:18:25.771: E/AndroidRuntime(2116): java.lang.IllegalStateException: Could not execute method of the activity 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at android.view.View$1.onClick(View.java:3591) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at android.view.View.performClick(View.java:4084) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at android.view.View$PerformClick.run(View.java:16966) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at android.os.Handler.handleCallback(Handler.java:615) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at android.os.Handler.dispatchMessage(Handler.java:92) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at android.os.Looper.loop(Looper.java:137) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at android.app.ActivityThread.main(ActivityThread.java:4745) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at java.lang.reflect.Method.invoke(Method.java:511) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at dalvik.system.NativeStart.main(Native Method) 
07-29 04:18:25.771: E/AndroidRuntime(2116): Caused by: java.lang.reflect.InvocationTargetException 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at java.lang.reflect.Method.invokeNative(Native Method) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at java.lang.reflect.Method.invoke(Method.java:511) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at android.view.View$1.onClick(View.java:3586) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  ... 11 more 
07-29 04:18:25.771: E/AndroidRuntime(2116): Caused by: java.lang.NullPointerException 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at com.rone.glucometer.AddDBHelper.updateDetails(AddDBHelper.java:119) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  at com.rone.glucometer.UpdateDBDetails.clickUpdateDelete(UpdateDBDetails.java:420) 
07-29 04:18:25.771: E/AndroidRuntime(2116):  ... 14 more

我AddDBHelper类是什么样子这样的：

public class AddDBHelper { 

public static final String KEY_ROWID ="_id"; 
public static final String KEY_CATEG = "Category"; 
public static final String KEY_CATEGPOS = "Category_Pos"; 
public static final String KEY_BGL = "BGL"; 
public static final String KEY_CARBS = "Carbs"; 
public static final String DB_NAME = "Glucometer.db"; 
public static final String DB_TABLE = "Journal"; 
private static final int DB_VERSION = 1; 

private DbHelper myDBHelper; 
private final Context mContext; 
private SQLiteDatabase glucoDB; 

private static class DbHelper extends SQLiteOpenHelper { 

    public DbHelper(Context context) { 
     super(context, DB_NAME, null, DB_VERSION); 
    } 


    @Override 
    public void onCreate(SQLiteDatabase db) { 
     db.execSQL("CREATE TABLE " + DB_TABLE + " (" + 
      KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
      KEY_CATEG + " TEXT NOT NULL, " + 
      KEY_CATEGPOS + " TEXT NOT NULL, " + 
      KEY_BGL + " TEXT NOT NULL, " + 
      KEY_CARBS + " TEXT NOT NULL);" 

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

} 


public AddDBHelper(Context c) { 
    mContext = c; 
} 

public AddDBHelper open() throws SQLException { 
    myDBHelper = new DbHelper(mContext); 
    glucoDB = myDBHelper.getWritableDatabase(); 
    return this; 
} 

public void close() { 
    myDBHelper.close(); 
} 

public long createEntry(String Category, String CategoryPos, String BGL, String Carbs) { 
    ContentValues cv = new ContentValues(); 
    cv.put(KEY_CATEG, Category); 
    cv.put(KEY_CATEGPOS, CategoryPos); 
    cv.put(KEY_BGL, BGL); 
    cv.put(KEY_CARBS, Carbs); 
return glucoDB.insert(DB_TABLE, null, cv); } 

public Cursor getEntries() {   
    return glucoDB.query(DB_TABLE, new String[] { 
      KEY_ROWID, 
      KEY_CATEG, 
      KEY_CATEGPOS, 
      KEY_BGL, 
      KEY_CARBS}, null, null, null, null, null); } 

public void updateDetails(DBDetails dbdetails) { 
    SQLiteDatabase db = myDBHelper.getWritableDatabase(); 

    ContentValues cv = new ContentValues(); 
    cv.put(AddDBHelper.KEY_ROWID, UpdateDBDetails.newRow); 
    cv.put(AddDBHelper.KEY_CATEG, UpdateDBDetails.newCateg); 
    cv.put(AddDBHelper.KEY_CATEGPOS, UpdateDBDetails.newCategPos); 
    cv.put(AddDBHelper.KEY_BGL, UpdateDBDetails.newBGL); 
    cv.put(AddDBHelper.KEY_CARBS, UpdateDBDetails.newCarbs); 

    db.update(DB_TABLE, cv, KEY_ROWID + "=?", new String[] {String.valueOf(UpdateDBDetails.newRow)}); 
} 


public void deleteDetails(DBDetails dbdetails) { 
    SQLiteDatabase db = myDBHelper.getWritableDatabase(); 
    db.delete(DB_TABLE, KEY_ROWID +"=?", 
      new String[] {String.valueOf(UpdateDBDetails.newRow)}); 
    db.close(); 
}}

我的ListView的活动如下：

public class FuncLogbook extends DashMenuActivity implements OnItemClickListener { 

private ListView list_LogbookResults; 
private ListAdapter list_LogbookAdap; 
private ArrayList<DBDetails> LogbookArrayList; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView (R.layout.dash_logbook); 

    list_LogbookResults = (ListView) findViewById(R.id.list_logbookResults); 
    list_LogbookResults.setOnItemClickListener(this); 

    LogbookArrayList = new ArrayList<DBDetails>(); 
    list_LogbookAdap = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, populateList()); 
    list_LogbookResults.setAdapter(list_LogbookAdap); } 

@SuppressWarnings("deprecation") 
public List<String> populateList() { 
    List<String> BGLResultsList = new ArrayList<String>(); 

    AddDBHelper logbook = new AddDBHelper(this); 
    logbook.open(); 
    Cursor cur = logbook.getEntries(); 
    startManagingCursor(cur); 

    while (cur.moveToNext()) { 
     String RowID = cur.getString(0); 
     String Category = cur.getString(1); 
     String CategoryPos = cur.getString(2); 
     String BGL = cur.getString(3); 
     String Carbs = cur.getString(4); 


     DBDetails detailsClass = new DBDetails(); 
     detailsClass.setuCateg(Category); 
     detailsClass.setuCategPos(CategoryPos); 
     detailsClass.setuBGL(BGL); 
     detailsClass.setuCarbs(Carbs); 


     LogbookArrayList.add(detailsClass); 
     BGLResultsList.add("BGL: " + BGL + "\nRow ID: " + RowID); 
    } 

    return BGLResultsList; 
} 

@Override 
protected void onResume() { 
    super.onResume(); 
    LogbookArrayList = new ArrayList<DBDetails>(); 
    list_LogbookAdap = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, populateList()); 
    list_LogbookResults.setAdapter(list_LogbookAdap); 
} 

@Override 
protected void onStart() { 
    super.onStart(); 
    LogbookArrayList = new ArrayList<DBDetails>(); 
    list_LogbookAdap = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, populateList()); 
    list_LogbookResults.setAdapter(list_LogbookAdap); 
} 

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {  
    Intent UpdateDBDetails = new Intent(this, UpdateDBDetails.class); 

    DBDetails clickedObject = LogbookArrayList.get(arg2); 
    Bundle dataBundle = new Bundle(); 
    dataBundle.putString("clickeduCateg", clickedObject.getuCateg()); 
    dataBundle.putString("clickeduCategPos", clickedObject.getuCategPos()); 
    dataBundle.putString("clickeduBGL", clickedObject.getuBGL()); 
    dataBundle.putString("clickeduCarbs", clickedObject.getuCarbs()); 


    UpdateDBDetails.putExtras(dataBundle); 
    startActivity(UpdateDBDetails); 
}}

的数据被收集到我的DBDetails类：

public class DBDetails { 

private String uCateg; 
private String uCategPos; 
private String uBGL; 
private String uCarbs; 

public String getuCateg() { 
    return uCateg; 
} 

public void setuCateg(String uCateg) { 
    this.uCateg = uCateg; 
} 

public String getuCategPos() { 
    return uCategPos; 
} 

public void setuCategPos(String uCategPos) { 
    this.uCategPos = uCategPos; 
} 

public String getuBGL() { 
    return uBGL; 
} 

public void setuBGL(String uBGL) { 
    this.uBGL = uBGL; 
} 

public String getuCarbs() { 
    return uCarbs; 
} 

public void setuCarbs(String uCarbs) { 
    this.uCarbs = uCarbs; 
}

最后，我的表格显示的数据：

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.updatedbdetails); 

update_category_spinner = (Spinner) findViewById(R.id.update_category_spinner); 
    ArrayAdapter<CharSequence> category_adapter = ArrayAdapter.createFromResource(
      this, R.array.category_array, android.R.layout.simple_spinner_item); 

    category_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); 
    update_category_spinner.setAdapter(category_adapter); 

    update_category_spinner.setOnItemSelectedListener(new OnItemSelectedListener() { 
     public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) { 
      newCat = update_category_spinner.getSelectedItem().toString(); 
      newCatPos = (update_category_spinner.getSelectedItemPosition() + " Position"); 
     } 

     public void onNothingSelected(AdapterView<?> arg0) { 

     } 
    }); 

Bundle takeBundledData = getIntent().getExtras(); 

    bundleduRowId = takeBundledData.getString("clickeduRowId"); 
    bundleduCateg = takeBundledData.getString("clickeduCateg"); 
    bundleduCategPos = takeBundledData.getString("clickeduCategPos"); 
    bundleduBGL = takeBundledData.getString("clickeduBGL"); 
    bundleduCarbs = takeBundledData.getString("clickeduCarbs"); 

CategoryPosition = String.valueOf(bundleduCategPos.charAt(0)); 
    update_category_spinner.setSelection(Integer.parseInt(CategoryPosition), true); 
update_edit_bgl.setText(bundleduBGL); 
    update_edit_carbs.setText(bundleduCarbs); } 

public static double round(double unrounded, int precision, int roundingMode) { 
    BigDecimal bd = new BigDecimal(unrounded); 
    BigDecimal rounded = bd.setScale(precision, roundingMode); 
    return rounded.doubleValue(); 
} 


public void checkNewBGL() { 
    String checkBGL = update_edit_bgl.getText().toString(); 
    if (checkBGL.matches("")) { 
     NewBGLValid = ""; 
    } else { 
     float BGLUnRound = Float.parseFloat(update_edit_bgl.getText().toString()); 
     double BGLRound= round(BGLUnRound, 1, BigDecimal.ROUND_HALF_UP); 
     NewBGLValid = String.valueOf(BGLRound); 
    } 
    return; 
    } 

    public void checkNewCarbs() { 
    String checkCarbs = update_edit_carbs.getText().toString(); 
    if (checkCarbs.matches("")) { 
     NewCarbsValid = "0"; 
    } else {   
     NewCarbsValid = update_edit_carbs.getText().toString(); 
    } 
    return; 
    } 

public void clickUpdateDelete(View v) { 

    checkNewBGL(); 
    checkNewCarbs(); 

    newCateg = newCat; 
    newCategPos = newCatPos; 
    newBGL = NewBGLValid; 
    newCarbs = NewCarbsValid; 

DBDetails dbdetails = new DBDetails(); 

    dbdetails.setuCateg(newCateg); 
    dbdetails.setuCategPos(newCategPos); 
    dbdetails.setuBGL(newBGL); 
    dbdetails.setuCarbs(newCarbs); 

if (v.getId() == R.id.update_button_delete) { 
     AddDBHelper deleteEntry = new AddDBHelper(this); 
     deleteEntry.deleteDetails(dbdetails); 
    } else if (v.getId() == R.id.update_button_save) { 
     AddDBHelper updateEntry = new AddDBHelper(this); 
     updateEntry.updateDetails(dbdetails); 
    } 
}}

我更新到

public void updateDetails(DBDetails dbdetails) { 
SQLiteDatabase db = myDBHelper.getWritableDatabase(); 
ContentValues cv = new ContentValues(); 
cv.put(AddDBHelper.KEY_CATEG, UpdateDBDetails.newCateg); 
cv.put(AddDBHelper.KEY_CATEGPOS, UpdateDBDetails.newCategPos); 
cv.put(AddDBHelper.KEY_BGL, UpdateDBDetails.newBGL); 
cv.put(AddDBHelper.KEY_CARBS, UpdateDBDetails.newCarbs); 
db.update(DB_TABLE, cv, KEY_ROWID + "=?", new String[] {UpdateDBDetails.getRowId});}

，并添加到UpdateDBDetails：

getRowId = dbdetails.getuRow();

但同样的问题发生。另外，在这个阶段，我没有关闭游标，因为如果我点击“后退”按钮而不是保存或删除，它会因尝试查询已关闭的游标而崩溃;我想我以后会解决这个问题。你说得对，我没有忘记定义UpdateDBDetails，但我已经在DBDetails上下文传递给方法，所以我现在已经改成

public void updateDetails(DBDetails dbdetails) { 
SQLiteDatabase db = myDBHelper.getWritableDatabase(); 
ContentValues cv = new ContentValues(); 
cv.put(AddDBHelper.KEY_CATEG, dbdetails.getuCateg()); 
cv.put(AddDBHelper.KEY_CATEGPOS, dbdetails.getuCategPos()); 
cv.put(AddDBHelper.KEY_BGL, dbdetails.getuBGL()); 
cv.put(AddDBHelper.KEY_CARBS, dbdetails.getuCarbs()); 
db.update(DB_TABLE, cv, KEY_ROWID + "=?", new String[] {dbdetails.getuRow()}); }

但同样，相同的问题。

解决方案：

我DBDetails.java具有以下行补充说：

public String getuRow() { 
    return uRow; 
} 

public void setuRow(String uRow) { 
    this.uRow = uRow; 
}

我的列表视图（FuncLogbook。Java的）有下列代码加入\改变：

public List<String> populateList() { 
    List<String> BGLResultsList = new ArrayList<String>(); 

    AddDBHelper logbook = new AddDBHelper(this); 
    logbook.open(); 
    Cursor cur = logbook.getEntries(); 
    startManagingCursor(cur); 

    while (cur.moveToNext()) { 
     String RowID = cur.getString(0); 
     String Category = cur.getString(3); 
     String CategoryPos = cur.getString(4); 
     String BGL = cur.getString(5); 
     String Carbs = cur.getString(6); 

DBDetails detailsClass = new DBDetails(); 
     detailsClass.setuRow(RowID); 
     detailsClass.setuCateg(Category); 
     detailsClass.setuCategPos(CategoryPos); 
     detailsClass.setuBGL(BGL); 
     detailsClass.setuCarbs(Carbs); 
LogbookArrayList.add(detailsClass); 
} 
return BGLResultsList; } 

public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {  
    Intent UpdateDBDetails = new Intent(this, UpdateDBDetails.class); 

    DBDetails clickedObject = LogbookArrayList.get(arg2); 
    Bundle dataBundle = new Bundle(); 
    dataBundle.putString("clickeduRowId", clickedObject.getuRow()); 
    dataBundle.putString("clickeduCateg", clickedObject.getuCateg()); 
    dataBundle.putString("clickeduCategPos", clickedObject.getuCategPos()); 
    dataBundle.putString("clickeduBGL", clickedObject.getuBGL()); 
    dataBundle.putString("clickeduCarbs", clickedObject.getuCarbs()); 
     UpdateDBDetails.putExtras(dataBundle); 
    startActivity(UpdateDBDetails); 
}

MY DB辅助类（AddDBHelper.java）显示如下：

public void updateDetails(DBDetails dbdetails) { 

    ContentValues cv = new ContentValues(); 
    cv.put(AddDBHelper.KEY_CATEG, dbdetails.getuCateg()); 
    cv.put(AddDBHelper.KEY_CATEGPOS, dbdetails.getuCategPos()); 
    cv.put(AddDBHelper.KEY_BGL, dbdetails.getuBGL()); 
    cv.put(AddDBHelper.KEY_CARBS, dbdetails.getuCarbs()); 
int count = glucoDB.update(DB_TABLE, cv, KEY_ROWID + "=?", new String[] {String.valueOf(dbdetails.getuRow())}); 
    Log.v("AddDbHelper", "Row " + dbdetails.getuRow() + " updated? " + count); 
} 

public void deleteDetails(DBDetails dbdetails) { 

    int count = glucoDB.delete(DB_TABLE, KEY_ROWID +"=?", 
      new String[] {String.valueOf(dbdetails.getuRow())}); 
    Log.v("AddDbHelper", "Row " + dbdetails.getuRow() + " deleted? " + count); 
}

最后，我UpdateDBDetails.java（其中包含与形式信息被修改或删除）显示：

onCreate...{ 
Bundle takeBundledData = getIntent().getExtras(); 

    bundleduRowId = takeBundledData.getString("clickeduRowId"); 
    bundleduCateg = takeBundledData.getString("clickeduCateg"); 
    bundleduCategPos = takeBundledData.getString("clickeduCategPos"); 
    bundleduBGL = takeBundledData.getString("clickeduBGL"); 
    bundleduCarbs = takeBundledData.getString("clickeduCarbs"); 
} 

public void clickUpdateDelete(View v) { 


    checkNewBGL(); 
    checkNewCarbs(); 

    newCateg = newCat; 
    newCategPos = newCatPos; 
    newBGL = NewBGLValid; 
    newCarbs = NewCarbsValid; 

AddDBHelper modifyEntry = new AddDBHelper(this); 
    modifyEntry.open(); 

    DBDetails dbdetails = new DBDetails(); 

    dbdetails.setuRow(bundleduRowId); 

    if (v.getId() == R.id.update_button_delete) { 
     modifyEntry.deleteDetails(dbdetails); 
    } else if (v.getId() == R.id.update_button_save) { 
     dbdetails.setuCateg(newCateg); 
     dbdetails.setuCategPos(newCategPos); 
     dbdetails.setuBGL(newBGL); 
     dbdetails.setuCarbs(newCarbs); 
modifyEntry.updateDetails(dbdetails); 
    } 
    modifyEntry.close(); 
    finish(); 
}

来源

2012-07-28 Ronnie

请发布完整的logcat跟踪，其中的信息是无价的。 – Sam 2012-07-28 16:57:03

'由...引起：java.lang.NullPointerException ...在com.rone .glucometer.AddDBHelper.updateDetails（AddDBHelper.java:119）'AddDBHelper（它在updateDetails（））中的119行是什么？我猜这是你第一次引用'UpdateDBDetails' ... – Sam 2012-07-28 19:00:57

**第118行：**'public void updateDetails（DBDetails dbdetails）{' **第119行：**'SQLiteDatabase db = myDBHelper.getWritableDatabase（）;' – Ronnie 2012-07-28 19:08:51

我没有看到你在哪里定义UpdateDBDetails。但是我有一些关于SQLiteDatabase.update（）的建议。

第一个将行ID添加到您的UpdateDBDetails对象并提供get方法。

然后使用这样的更新方法：

public void updateDetails() { 
    ContentValues cv = new ContentValues(); 
    cv.put(AddDBHelper.KEY_CATEG, UpdateDBDetails.newCateg); 
    cv.put(AddDBHelper.KEY_CATEGPOS, UpdateDBDetails.newCategPos); 
    cv.put(AddDBHelper.KEY_BGL, UpdateDBDetails.newBGL); 
    cv.put(AddDBHelper.KEY_CARBS, UpdateDBDetails.newCarbs); 

    db.update(DB_TABLE, cv, KEY_ROWID + "=?", new String[] {UpdateDBDetails.getuRow()}); 
}

当你更新行其ID不应该改变，否则你会创建一个新的行或更新不同的行...所以ContentValues对象不应该尝试添加任何有关AddDBHelper.KEY_ROWID的内容，但是SQLiteDatabase.update（）的WHERE子句应该具有当前行的ID。希望这是有道理的。

此外，只要您使用new AddDBHelper或myDBHelper.getWritableDatabase()（或者如果你直接使用游标），当您完成您应该关闭这些对象。否则，它们会一直存在，不必要地消耗内存。从logcat的

此外，我看到你的logcat，我猜有什么毛病UpdateDBDetails但我只注意到在您调用updateDetails（），并建议：

添加行号到DBDetails所以你可以这样做：

AddDBHelper helper = new AddDBHelper(this); helper.open(); DBDetails dbdetails = new DBDetails(); dbdetails.setuRow(bundleduRowId); if (v.getId() == R.id.update_button_delete) { helper.deleteDetails(dbdetails); } else if (v.getId() == R.id.update_button_save) { dbdetails.setuCateg(newCateg); dbdetails.setuCategPos(newCategPos); dbdetails.setuBGL(newBGL); dbdetails.setuCarbs(newCarbs); helper.updateDetails(dbdetails); } helper.close();

而在去年AddDbHepler：

public void updateDetails(DBDetails dbdetails) { ContentValues cv = new ContentValues(); cv.put(AddDBHelper.KEY_CATEG, dbdetails.newCateg); cv.put(AddDBHelper.KEY_CATEGPOS, dbdetails.newCategPos); cv.put(AddDBHelper.KEY_BGL, dbdetails.newBGL); cv.put(AddDBHelper.KEY_CARBS, dbdetails.newCarbs); glucoDB.update(DB_TABLE, cv, KEY_ROWID + "=?", new String[] {String.valueOf(dbdetails.getuRow())}); }

logcat的

两个更新和删除返回多少行受到了影响一个整数，你可以看到他们自己是这样的：

int count = glucoDB.update(DB_TABLE, cv, KEY_ROWID + "=?", new String[] {String.valueOf(dbdetails.getuRow())}); Log.v("AddDbHelper", "Row " + dbdetails.getuRow() + " updated? " + count);

如果你看到” ...更新？ 1“，那么它的工作，否则在DBDetails中存储的ID是关闭。

来源

2012-07-28 17:16:27 Sam

对不起，它不断搅乱我的格式 – Ronnie 2012-07-28 18:46:43

是的，评论的格式非常有限，但他们可以编辑（5分钟）并删除。在你的问题中编辑代码块是最简单的。 – Sam 2012-07-28 18:56:55

删除了评论的混乱，并将它们转移到原始帖子的底部。希望可以让阅读更容易。 – Ronnie 2012-07-28 19:03:32

更新或从数据库中删除时出错; “无法执行方法”

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