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Question

我使用下一个代码来使用临时SQLite表：

public class DBHelperForTemp extends SQLiteOpenHelper {

private final static String DB_NAME = "tempdb";
private final static int DB_VERSION = 3;

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

@Override
public void onCreate(SQLiteDatabase db) {
    String createTable = "CREATE TABLE tbl ( ID INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, image BLOB )";
    db.execSQL(createTable);
}

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

public boolean add_Temp_Values(String name, byte[] image) throws SQLiteException {
    SQLiteDatabase db = this.getWritableDatabase();

    ContentValues contentValues = new ContentValues();
    contentValues.put("name", name);
    contentValues.put("image", image);

    long result = db.insert("tbl", null, contentValues);

    return result != -1;
}


public Cursor get_Data(){
    SQLiteDatabase db = this.getWritableDatabase();
    String query = "SELECT * FROM tbl";
    return db.rawQuery(query, null);
}


public void ClearData(){
    SQLiteDatabase db = this.getWritableDatabase();
    db.execSQL("delete from tbl");
}

}

将数据保存到temp：

private void  doTemp(){
    final Bitmap photo = ((BitmapDrawable) mPhotoImageView.getDrawable()).getBitmap();
    boolean insertData = mDBTemp.add_Temp_POI_Values(mNameEditText.getText().toString(),
           Utils.imageToByteArray(photo) );
    if (insertData){
        Toast.makeText(this, R.string.fb_success, Toast.LENGTH_SHORT).show();
    } else {
        Toast.makeText(this, R.string.fb_error, Toast.LENGTH_SHORT).show();
    }
    finish();
}

并尝试从temp读取并发送到firebase：

private void onSubmit(){
    final DBHelperForTemp mDBTemp = new DBHelperForTemp(this);
    final Cursor data = mDBTemp.get_Data();
    if (data != null && data.getCount() != 0 && data.moveToFirst()){
        for (int i = 0; i < data.getCount(); i++) {
            final String name = data.getString(data.getColumnIndex("name"));
            final byte[] byteArray = data.getBlob(data.getColumnIndex("image"));
            final Bitmap photo = BitmapFactory.decodeByteArray(byteArray, 0 , byteArray.length);
.........

尝试使用时会收到下一个错误代码：

E/UncaughtException: 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:451)
                                                                                         at android.database.AbstractWindowedCursor.getString(AbstractWindowedCursor.java:51)
                                                                                         at com.test.test.activities.ActivityMain.onSubmit

有趣的是，如果我在临时表中没有图像，代码就可以工作。如果有一个图像应用程序崩溃但在那里尝试读取名称字符串而不是图像。

任何人都可以帮我发现问题吗？

data.getCount（）返回1. data.getColumnIndex（“name”）返回0. data.getString（0）return方法抛出'java.lang.IllegalStateException'异常。无法从CursorWindow读取第0行第1列。在从中访问数据之前，请确保Cursor已正确初始化。

Answer 1

您存储的图像可能太大，CursorWindow的最大尺寸为每行2048Kb