我一直在试图加密文件并将这些文件重新写回到同一个地方。但是我收到错误消息:“java.io.FileNotFoundException:/ storage/emulated/0/New file.txt:open failed:EACCES(Permission denied)”。java.io.FileNotFoundException:/ storage/emulated/0/New file.txt:打开失败:EACCES(权限被拒绝)
我的清单文件是该
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.tdk.mytestapplication2">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
android:allowBackup="true"
我想我已经提供了正确的权限存在。这个代码是用来加密文件的。
public static void encrypt(SecretKey secretKey, String filePath){
try {
// Here you read the cleartext.
FileInputStream fis = new FileInputStream(filePath);
// This stream write the encrypted text. This stream will be wrapped by another stream.
FileOutputStream fos = new FileOutputStream(filePath);
// Create cipher
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, secretKey);
// Wrap the output stream
CipherOutputStream cos = new CipherOutputStream(fos, cipher);
// Write bytes
int b;
byte[] d = new byte[8];
while ((b = fis.read(d)) != -1) {
cos.write(d, 0, b);
}
// Flush and close streams.
cos.flush();
cos.close();
fis.close();
}catch(IOException e){
e.printStackTrace();
}catch (NoSuchAlgorithmException e){
e.printStackTrace();
}catch(NoSuchPaddingException e){
e.printStackTrace();
}catch(InvalidKeyException e){
e.printStackTrace();
}
}
而且我用了一个按钮
Button btnEncrypt = (Button) findViewById(R.id.btnEnc);
btnEncrypt.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
aesKey = EncAndDec.generateKey();
String filePath = editText.getText().toString();
//Generating the file hash
String md5Hash = MD5Hash.getMD5(filePath);
System.out.println(aesKey.toString());
System.out.println(filePath);
System.out.println(md5Hash);
//Encrypting the file
for(int i=1; i<100; i++) {
EncAndDec.encrypt(aesKey, filePath);
}
}
});
内这种方法我仍然无法配置此错误。请有人帮忙!
https://stackoverflow.com/questions/32635704/android-permission-doesnt-work-even-if-i-have-declared-it – CommonsWare
请同时确认:'/ storage/emulated/0 /新的file.txt:'存在?你在浏览设备时看到了吗? – ishmaelMakitla
@ishmaelMakitla嗯,因为消息是“权限被拒绝”,那么文件确实存在(如果它没有消息将是“文件未找到”) – niceman