我得到的文件的上级目录不可写一个SD卡出口 [英] I get Parent directory of file is not writable for an SDCard export
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问题描述
我有这样的code:
public static class ExportDatabaseFileTask extends AsyncTask<String, Void, Boolean> {
private Context ctx;
/**
*
*/
public ExportDatabaseFileTask(Context ctx) {
super();
this.ctx = ctx;
}
// automatically done on worker thread (separate from UI thread)
protected Boolean doInBackground(final String... args) {
File dbFile = new File(Environment.getDataDirectory()
+ "/data/com.mypkg/databases/log.db");
File exportDir = new File(Environment.getExternalStorageDirectory(), "");
if (!exportDir.exists()) {
exportDir.mkdirs();
}
File file = new File(exportDir, dbFile.getName());
try {
file.createNewFile();//*
this.copyFile(dbFile, file);
return true;
} catch (IOException e) {
Log.e("mytag", e.getMessage(), e);
return false;
}
}
// can use UI thread here
protected void onPostExecute(final Boolean success) {
if (success) {
Toast.makeText(ctx, "Export successful!", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(ctx, "Export failed", Toast.LENGTH_SHORT).show();
}
}
void copyFile(File src, File dst) throws IOException {
FileChannel inChannel = new FileInputStream(src).getChannel();
FileChannel outChannel = new FileOutputStream(dst).getChannel();
try {
inChannel.transferTo(0, inChannel.size(), outChannel);
} finally {
if (inChannel != null)
inChannel.close();
if (outChannel != null)
outChannel.close();
}
}
}
在的标记线
file.createNewFile();
我得到 java.io.IOException异常:文件的上级目录不可写:/sdcard/log.db
我安装了SD卡,我可以轻松地将文件复制到它。可能是什么问题?
I have an sdcard installed and I can easily copy files to it. What might be wrong?
推荐答案
只是当有人七嘴八舌它犯错
Just when someone rushes it makes mistakes
这是一个缺少权限
<uses-permission
android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
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