这段代码意思！谢谢看一下

Question

String testString = "blah";
FileOutputStream stream = new FileOutputStream(tmpFile);
stream.write(testString.getBytes());
stream.close();

        assertTrue(mTestDevice.syncFiles(tmpDir, externalStorePath));
        String tmpFileContents = mTestDevice.executeShellCommand(String.format("cat %s",
                expectedDeviceFilePath));
        assertTrue(tmpFileContents.contains(testString));

Answer 1

tmpDir是哪儿来的？没看到声明呢？