尝试FileOutputStream（externalStorage.getAbsolutePath（））时，FileOutputStream会导致异常;

Question

我正在尝试编写一个简单的测试方法，将文件从Asset文件夹复制到SD卡。当我尝试在SD卡上打开文件时，它会崩溃。

码

        try {
              // POpne file from asset
               AssetManager assetManager = getAssets();
               InputStream inputStream;
               inputStream = assetManager.open("test");

               // open output folder
               File externalStorage = Environment.getExternalStorageDirectory();

                       // CRASHES HERE
               out = new FileOutputStream(  externalStorage.getAbsolutePath()  );
               int c;

            while ((c =  inputStream.read()) != -1) {
                out.write(c);
            }
        } catch( Exception e) {

        }
    }

Answer 1

您似乎忘记在AndroidManifest.xml中提及文件访问权限，只需在AndroidManifest.xml中写下以下权限

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