我知道Kit Kat只能写入SD卡上的应用程序包特定目录。然而,我的印象是你仍然可以通过以下方式将文件从SD卡复制到本地存储:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
我只是测试我是否可以复制一个文件。如果我能够这样做,我将添加代码来搜索整个SD卡DCIM文件夹。现在我有以下代码(请原谅代码的混乱,我写了C#和vb.net,但java对我来说还是一个新东西):
String dirPath = getFilesDir().getAbsolutePath() + File.separator + "TCM";
File projDir = new File(dirPath);
if (!projDir.exists())
projDir.mkdirs();
String CamPath = projDir + File.separator + tv2.getText();
File projDir2 = new File(CamPath);
if (!projDir2.exists())
projDir2.mkdirs();
File LocalBuck = new File(projDir2 + File.separator );
String imageInSD = Environment.getExternalStorageDirectory().getAbsolutePath();
File directory1 = new File (sdCard.getAbsolutePath() + "/DCIM");
File directory = new File(directory1 + "/100SDCIM");
File Buckfile = new File(directory, "/BigBuck.jpg");
try {
exportFile(Buckfile, LocalBuck);
} catch (IOException e) {
e.printStackTrace();
}
以下是导出功能/应用程序的代码:
private File exportFile(File src, File dst) throws IOException {
//if folder does not exist
if (!dst.exists()) {
if (!dst.mkdir()) {
return null;
}
}
String timeStamp = new SimpleDateFormat("yyyy_MM_dd_HHmmss").format(new Date());
File expFile = new File(dst.getPath() + File.separator + "IMG_" + timeStamp + ".jpg");
FileChannel inChannel = null;
FileChannel outChannel = null;
try {
//Straight to Error Handler
inChannel = new FileInputStream(src).getChannel();
outChannel = new FileOutputStream(expFile).getChannel();
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
inChannel.transferTo(0, inChannel.size(), outChannel);
} finally {
if (inChannel != null)
inChannel.close();
if (outChannel != null)
outChannel.close();
}
return expFile;
}
以下是我的模拟器的样子: 寻找:Debug of SD Location
应该找到它?:EmulatorShowingSd
问题:我甚至可以在KitKat之后将文件从SD卡复制到本地存储;如果是这样导致在尝试访问SD卡文件时引发异常的代码有什么问题?