使用eclipse中的文件资源管理器。Select Windows => Show View => Other…>文件资源管理器。

另一种方法是通过adb提取文件:

adb pull /system/data/data/<yourpackagename>/databases/<databasename> /sdcard

我也曾经遇到过同样的问题。除了adb shell或根设备，没有办法在android设备中直接访问文件。

下面是02种替代方案:

1)

 public void exportDatabse(String databaseName)
   {
     try {
        File sd = Environment.getExternalStorageDirectory();
        File data = Environment.getDataDirectory();

        if (sd.canWrite()) {
            String currentDBPath = "//data//"+getPackageName()+"//databases//"+databaseName+"";
            String backupDBPath = "backupname.db";
            File currentDB = new File(data, currentDBPath);
            File backupDB = new File(sd, backupDBPath);

            if (currentDB.exists()) {
                FileChannel src = new FileInputStream(currentDB).getChannel();
                FileChannel dst = new FileOutputStream(backupDB).getChannel();
                dst.transferFrom(src, 0, src.size());
                src.close();
                dst.close();
            }
        }
    } catch (Exception e) {

    }
}

2)试试这个:https://github.com/sanathp/DatabaseManager_For_Android

在未根的Android 5.0+设备上从可调试应用程序文件夹(例如/data/data/package.name/databases/file)中提取文件最简单的方法(只是一个简单的步骤)是使用以下命令:

adb exec-out run-as package.name cat databases/file > file

打开命令提示符 将目录改为E:\Android\adt-bundle-windows-x86_64-20140702\adt-bundle-windows-x86_64-20140702\sdk\platform-tools 输入以下命令 Adb -d shell 执行命令-as com.your.packagename cat databases/database.db > /sdcard/database.db 将目录更改为cd /sdcard，确保database.db在那里。 Adb pull /sdcard/database.db或者简单地从设备复制database.db。

你可以像这样下载一个文件:

Adb执行run-as debug .app.package.name cat files/file.mp4 > file.mp4

在你下载之前，你可能不想看看你的App-Directory中的文件结构。要做到这一点，请按照上面THelper提到的步骤:

adb shell
run-as com.your.packagename 
cd files
ls -als .

Shahidul提到的Android-Studio方式(https://stackoverflow.com/a/44089388/1256697)也可以。对于那些在菜单中没有看到DeviceFile资源管理器选项的人:请确保在Android Studio中打开/ Android - directory。 例如，react-native用户在他们的Project-Folder中有这个和/ios-Directory在同一级别。

adb backup didn't work for me, so here's what I did (Xiaomi Redmi Note 4X, Android 6.0): 1. Go to Settings > Additional Settings > Backup & reset > Local backups. 2. Tap 'Back up' on the bottom of the screen. 3. Uncheck 'System' and 'Apps' checkmarks. 4. Tap detail disclosure button on the right of the 'Apps' cell to navigate to app selection screen. 5. Select the desired app and tap OK. 6. After the backup was completed, the actual file need to be located somehow. Mine could be found at /MIUI/backup/AllBackup/_FOLDER_NAMED_AFTER_BACKUP_CREATION_DATE_. 7. Then I followed the steps from this answer by RonTLV to actually convert the backup file (.bak in my case) to tar (duplicating from the original answer): " a) Go here and download: https://sourceforge.net/projects/adbextractor/ b) Extract the downloaded file and navigate to folder where you extracted. c) run this with your own file names: java -jar abe.jar unpack c:\Intel\xxx.ab c:\Intel\xxx.tar "