从Android应用程序导出文件

Question

I would export my data into download folder of internal sd. Then, i have add the permission in manifest.xml:

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

I must add also the permission to write to internal storage?

Then i call a method that include this:

String file = android.os.Environment.getExternalStorageDirectory().getAbsolutePath();

So, where i export my file? In what folder? Can i change this folder?

Answer 1

Dude只打印你的文件String，它会告诉你路径，如果你在你的Phone / Emulator中添加了SDCARD，它会给你“/ sdcard / ..”，好像那个案例文件中没有sdcard会有null对象。