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Android - Can not find the file although it exists in the data folder?
try {
    File sd = Environment.getExternalStorageDirectory();
    File data = Environment.getDataDirectory();

    if (sd.canWrite()) {
        String currentDBPath = "\data\PackageName\databases\myDB.db";
        String backupDBPath = "myDB.db";
        File currentDB = new File(data, currentDBPath);
        File backupDB = new File(sd, backupDBPath);

        if (currentDB.exists())
        {
           // code to copy from currentDB  to backupDB
        }
    }
} catch (Exception e) {
}

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>

try
 {
    File sd = Environment.getExternalStorageDirectory();
    File data = Environment.getDataDirectory();

    if (sd.canWrite()) {
        String currentDBPath = "\data\PackageName\databases\myDB";
        String backupDBPath = "myDB";
        File currentDB = new File(data, currentDBPath);
        File backupDB = new File(sd, backupDBPath);

        if (currentDB.exists())
        {
           // code to copy from currentDB  to backupDB
        }
    }
} catch (Exception e) {
}