Question

我正在尝试从我的testcase写一个文件。我正在尝试写入内部存储，但它给出了权限错误。 `

Context context = InstrumentationRegistry.getContext();
        AssetManager assetManager = context.getAssets();
        InputStream inputStream = null;
        try {
            inputStream =  context.getAssets().open("myFile");
        } catch (IOException e) {
            e.printStackTrace();
        }
        try{
            File f = new File(context.getFilesDir(),"outfile");
            OutputStream outputStream = new FileOutputStream(f);
            byte buffer[] = new byte[1024];
            int length = 0;

            while((length=inputStream.read(buffer)) > 0) {
                outputStream.write(buffer,0,length);
            }

            outputStream.close();
            inputStream.close();

            return f;
        }catch (IOException e) {
            e.printStackTrace();
        }

        return null;
    }`

java.io.FileNotFoundException：/ data / user / 0 / package / files / outfile（Permission denied）

Answer 1

您可以使用Junit的临时文件夹来模拟本地存储。

TemporaryFolder temporaryFolder = getTemporaryFolder();
File outFile = temporaryFolder.newFile("outFile");
OutputStream outputStream = new FileOutputStream(outFile);

Answer 2

问题在于背景。用于获取app上下文而不是context = InstrumentationRegistry.getContext（）;使用getTargetContext（（）

android：从testcase写入文件

2 个答案: