检索图像时应用程序崩溃

Question

我使用下面的代码插入了捕获图像并得到 "not null" 表明数据不为空。

        button.setOnClickListener(new View.OnClickListener() {
            public void onClick(View arg0) {

                if ((name != null && name.trim().length() > 0) && (result != null && result.trim().length() > 0)) {
                   // Toast.makeText(getActivity().getApplicationContext(), fk+"", Toast.LENGTH_LONG).show();
                    byte[] data=getBitmapAsByteArray(Global.img); // this is a function
                    if(data==null)
                    {
                        Toast.makeText(getActivity(), "null", Toast.LENGTH_LONG).show();
                    }
                    else
                    {


                        Toast.makeText(getActivity(), " not null", Toast.LENGTH_LONG).show();
                        SB.insertStaffBenefit(name, data, description, result, fk);
                    }
                }

        });
        return claims;
    }
public static byte[] getBitmapAsByteArray(Bitmap bitmap)
{
    ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG, 0, outputStream);
    return outputStream.toByteArray();
}

但是，当我尝试检索捕获的图像时，应用程序崩溃了。

 public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.receipt);
    dbHelper = new MyDatabaseHelper(this);
    final String k = getIntent().getExtras().getString("ID");
    Toast.makeText(getApplicationContext(), k+"", Toast.LENGTH_LONG).show();
     ImageView a=(ImageView)findViewById(R.id.imageView5);
     database = dbHelper.getWritableDatabase();
     c = database.rawQuery("SELECT s.Image FROM Information i LEFT JOIN StaffBenefit s ON s.Twd_id=i._id WHERE i._id=? ", new String[]{String.valueOf(k)},null);
                if(c.moveToFirst())
                        {
                       byte[] img=c.getBlob(c.getColumnIndexOrThrow("Image"));
                        if(img!=null)
                        {
                            Log.e("TAG", " Not null");
                        }
                        else
                        {
                            Log.e("TAG", " null");
                        }
                        ByteArrayInputStream imageStream = new ByteArrayInputStream(img);
                        Bitmap theImage= BitmapFactory.decodeStream(imageStream);
                        a.setImageBitmap(theImage);

                    }

                c.close();
            }
        }

MyDatabaseHelper.java

 public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table " + TABLE_STAFF_BENEFIT + "( "  + ID3 + " INTEGER PRIMARY KEY , Claim_Type TEXT, Image BLOB, Description TEXT , Amount TEXT, Twd_id INTEGER, FOREIGN KEY(Twd_id) REFERENCES "+TABLE_INFO+"(_id))");
}

Caused by: java.lang.IllegalStateException: Couldn't read row 0, col 0 from CursorWindow. Make sure the Cursor is initialized correctly before accessing data from it. at android.database.CursorWindow.nativeGetBlob(Native Method) at android.database.CursorWindow.getBlob(CursorWindow.java:404) at android.database.AbstractWindowedCursor.getBlob(AbstractWindowedCursor.java:45) at com.example.project.project.Receipt.onCreate(Receipt.java:40)

(Receipt.java:40)

  byte[] img=c.getBlob(c.getColumnIndexOrThrow("Image"));

是否如Retrieve large blob from Android sqlite database所述由大斑点引起的错误？我该如何解决？谢谢

Answer 1

我想你自己找到了解决方案。

你知道onClick-Handler中的Image/Images is/are有多大吗？如果它们大于 1Mb，您将无法在一个光标中保存信息。请参阅您自己的 link 以获取解决方案。

但也许您可以先测试一下，如果可能的话。尝试 insert/select 一张小于 1Mb 的图片，然后一张大于 1Mb 的图片。

如果第一个测试成功而第二个没有，您需要按照 post 中的解决方案：Retrieve large blob from Android sqlite database

检索图像时应用程序崩溃

App crashed when retrieve image out

java

sqlite

android

cursor