Question

我已经创建了静态数据库，并且这个数据库为图像添加了基本的64字符串这个图像是大尺寸我运行了我的应用程序，同时获取数据库的错误以获取字符串如何解决它。
我是android编程的新手......

数据库

List<Hashmap<String, Object>> getAll()

适配器

public List<People> getAllPeople() {

    List<People> peoples = new ArrayList<>();

    try {
        SQLiteDatabase db = SQLiteDatabase.openDatabase(DB_PATH + DB_NAME, null, SQLiteDatabase.OPEN_READWRITE);
        Cursor cursor = db.rawQuery("select * from " + TABLE_PEOPLE, null);
        while (cursor.moveToNext()) {
            if (cursor != null) {
                String peopleImage = cursor.getString(cursor.getColumnIndex(PEOPLE_IMAGE));\\ This line getting error
                String categoryId = cursor.getString(cursor.getColumnIndex(CATEGORY_ID));
                String peopleName = cursor.getString(cursor.getColumnIndex(PEOPLE_NAME));
                String peopleId = cursor.getString(cursor.getColumnIndex(ID));
                int status = cursor.getInt(cursor.getColumnIndex(STATUS));
                String month = cursor.getString(cursor.getColumnIndex(PEOPLE_MONTH));
                String date = cursor.getString(cursor.getColumnIndex(PEOPLE_DATE));
                String year = cursor.getString(cursor.getColumnIndex(PEOPLE_YEAR));
                String peopleDetail = cursor.getString(cursor.getColumnIndex(PEOPLE_DETAIL));


                People people = new People();
                people.setId(peopleId);
                people.setPeopleName(peopleName);
                people.setPeopleImage(peopleImage);
                people.setStatus(status);
                people.setMonth(month);
                people.setDate(date);
                people.setYear(year);
                people.setPeopleDetail(peopleDetail);
                people.setCategoryId(categoryId);

                peoples.add(people);
            }
        }
    } catch (Exception e) {
        Log.d("DB", e.getMessage());
    }
    return peoples;
}

Answer 1

就个人而言，我认为将图像存储在数据库中并不是一个好主意。将它们保存在Base64中会使您的解决方案更慢，您需要在每次操作时进行编码和解码。我的建议是你将图像文件保存在存储介质上并将URI保存在数据库中，它更快，更易于管理。

如果你因任何原因确实需要这样做...尝试在android:largeHeap="true"中设置AndroidManifest.xml。

更新：

  private static final String FOLDER="/MyApp/";  
  private static String saveBitmapToSd(Bitmap bmp, String fileName){
        String pngName=Environment.getExternalStorageDirectory().toString()+FOLDER+fileName+".png";
        FileOutputStream fos= null;
        boolean success=false;
        try {
            fos = new FileOutputStream(new File(pngName));
            bmp.compress(Bitmap.CompressFormat.PNG,100,fos);
            success=true;
        } catch (FileNotFoundException e) {
            Log.e(TAG, "saveBitmapToSd: ", e);
        }
        finally {
            if(fos!=null)
                try {
                    fos.close();
                } catch (IOException e) {
                    Log.e(TAG, "saveBitmapToSd: ",e );
                }
        }
        if(success)
            return pngName;
        else
            return null;
    }

这是将位图保存到SD卡并返回路径字符串的方法。我刚刚写了一个非常简单的演示应用程序，你可以在这里查看。 Demo App

android中android.database.CursorWindow.getString的java.lang.OutOfMemoryError

1 个答案: