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我是新來的android，我建立活動點擊提交按鈕從五個edittext獲取數據作爲json和隱藏到AES加密，並將其存儲在本地當我刷新或重新啓動我想取文件解密，並自動填充到5編輯文本的活動......加密工作正常，但對我來說解密不會......幫我如何解密（AES）存儲在本地存儲的加密文件
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
e1 = (EditText)findViewById(R.id.editText1);
e2 = (EditText)findViewById(R.id.editText2);
e3 = (EditText)findViewById(R.id.editText3);
e4 = (EditText)findViewById(R.id.editText4);
e5 = (EditText)findViewById(R.id.editText5);
final JSONObject obj = new JSONObject();
sub = (Button)findViewById(R.id.button);
final File file = new File(Environment.getExternalStorageDirectory().getAbsolutePath(), "Outer_Folder");
file.mkdir(); // store and fetch file from storage...
f1 = new File(file,"null"+".txt");
f2 = new File(fileD,"null"+".txt");
try {
SecureRandom srm = SecureRandom.getInstance("SHA1PRNG");
srm.setSeed("no one can read".getBytes());
KeyGenerator kg = KeyGenerator.getInstance("AES");
kg.init(128,srm);
sec = kg.generateKey();
bb1 = sec.getEncoded();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
if (f1.exists()){
File file3 = new File(Environment.getExternalStorageDirectory().getAbsolutePath(), "Outer_Folder");
f4 = new File(file3,"null"+".txt");
int size = (int)f4.length();
contents = new byte[size];
try {
bufferedInputStream = new BufferedInputStream(new FileInputStream(f4));
try {
bufferedInputStream.read(contents);
bufferedInputStream.close();
String dd = new String(contents);
SecretKeySpec sdf = new SecretKeySpec(bb1,"AES");
Cipher cv = Cipher.getInstance("AES");
cv.init(Cipher.DECRYPT_MODE,sdf);
decodefile = cv.doFinal(dd.getBytes()); // aes decryption not working
String ggg = new String(decodefile);
Toast.makeText(getApplicationContext(),ggg,Toast.LENGTH_SHORT).show();
JSONObject jsonObj = new JSONObject(ggg);
v1=jsonObj.getString("one");
v2=jsonObj.getString("two"); // when enter the activity json filled by decryped file
v3=jsonObj.getString("three");
v4=jsonObj.getString("four");
v5=jsonObj.getString("five");
e1.setText(v1);
e2.setText(v2);
e3.setText(v3);
e4.setText(v4);
e5.setText(v5);
} catch (IOException e) {
e.printStackTrace();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (InvalidKeyException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
catch (BadPaddingException e) {
e.printStackTrace();
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} }else {
Toast.makeText(getApplicationContext(),"con't read",Toast.LENGTH_LONG).show();
} sub.setOnClickListener(new View.OnClickListener() {
@TargetApi(Build.VERSION_CODES.KITKAT)
@Override
public void onClick(View v) {
s1=e1.getText().toString();
s2=e2.getText().toString();
s3=e3.getText().toString();
s4=e4.getText().toString();
s5=e5.getText().toString();
try {
obj.put("one", s1);
obj.put("two", s2);
obj.put("three", s3); //converting json
obj.put("four", s4);
obj.put("five", s5);
if (f1.exists()){ //
f1.delete();
}
vv = obj.toString();
new execute();
try {
SecretKeySpec sksep = new SecretKeySpec(bb1,"AES");
Cipher cp = Cipher.getInstance("AES");
cp.init(Cipher.ENCRYPT_MODE,sksep);
encobyte = cp.doFinal(vv.getBytes()); // aes encryption - working
FileOutputStream uu = null;
uu = new FileOutputStream(f1);
uu.write(encobyte);
oo = new String(encobyte);
Toast.makeText(getApplicationContext(),oo,Toast.LENGTH_LONG).show();
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
} catch (NoSuchPaddingException e) {
e.printStackTrace();
} catch (InvalidKeyException e) { //
e.printStackTrace();
} catch (BadPaddingException e) {
e.printStackTrace(); //
} catch (IllegalBlockSizeException e) {
e.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}