java Android应用程序存储和调用用户名和密码
我有一个要创建登录活动的应用程序。我有 1) 登录(按钮) 2) 用户ID(编辑文本) 3) 密码(编辑文本)
我想将用户名和密码存储在设备的内部存储器中。如何创建SharedReferences从中提取的文件并对其进行加密
login_Button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
SharedPreferences userDetails = getSharedPreferences("userdetails", MODE_PRIVATE);
SharedPreferences.Editor edit = userDetails.edit();
edit.clear();
if(etUserID.getText().toString().equals("")){
Toast.makeText(getApplicationContext(),"Please enter a User ID", Toast.LENGTH_LONG).show();
}else if (etPassword.getText().toString().equals("")){
Toast.makeText(getApplicationContext(),"Please enter a password", Toast.LENGTH_LONG).show();
}else{
edit.putString("userID", txtUID.getText().toString().trim());
edit.putString("password", txtPass.getText().toString().trim());
edit.commit();
}
}
});
txtid和txtPass显示为红色,当我删除它时,系统会说getText是错误的
这是我第一次使用验证器。我在安卓开发页面上找到了一个名为PasswordAuthentication的东西,但我还没有找到任何教程或代码
SharedPreferences userDetails = getSharedPreferences("userdetails", MODE_PRIVATE);
String UID = userDetails.getString("userID", "");
String pass = userDetails.getString("password", "");
if (userDetails.contains("userID")||userDetails.contains("password")){
startActivity(new Intent(LogOn.this,CrimeMap.class));
}
我用于研究的资料来源: http://developer.安卓.com/reference/java/net/PasswordAuthentication.html how to use getSharedPreferences in 安卓
更新:
好的,这是我的更新代码。如果我没有输入用户ID或密码,则会触发我的语句。但是,当我输入正确的用户ID和密码时,程序不会转到下一个活动。我先让它运行,然后再加密它
@覆盖 创建时受保护的void(Bundle savedInstanceState){ 超级的onCreate(savedInstanceState); setContentView(R.layout.activity\u logon)
etUserID = (EditText) findViewById(R.id.etUserID);
etPassword = (EditText) findViewById(R.id.etPassword);
login_Button = (Button) findViewById(R.id.bLogin);
login_Button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
int uid = 1155;
String pass = "pass";
SharedPreferences userDetails = getSharedPreferences(User_File, MODE_PRIVATE);
SharedPreferences.Editor edit = userDetails.edit();
edit.putInt("userID", uid);
edit.putString("password", pass);
edit.commit();
if((etUserID.getText().toString().equals("")) || (etPassword.getText().toString().equals(""))) {
Toast.makeText(getApplicationContext(),"Please enter a User ID", Toast.LENGTH_LONG).show();
}else if (etPassword.getText().toString().equals("")){
Toast.makeText(getApplicationContext(),"Please enter a password", Toast.LENGTH_LONG).show();
}else{
edit.putInt("userID", Integer.parseInt(etUserID.getText().toString()));
edit.putString("password", etPassword.getText().toString());
}
}
});
SharedPreferences userDetails = getSharedPreferences(User_File, MODE_PRIVATE);
if (userDetails.equals(etUserID) && (userDetails.equals(etPassword))){
startActivity(new Intent(LogOn.this,CrimeMap.class));
}
更新:
我终于明白了!谢谢你的帮助!这是我的完整代码,这部分的项目。我仍然没有加密它,但我想我会休息一下,稍后再回来。谢谢你的帮助
@Override
public void onClick(View v) {
int uid = 1155;
String pass = "pass";
SharedPreferences userDetails = getSharedPreferences(User_File, MODE_PRIVATE);
SharedPreferences.Editor edit = userDetails.edit();
edit.putInt("userID", uid);
edit.putString("password", pass);
edit.commit();
if((etUserID.getText().toString().equals(""))){
Toast.makeText(getApplicationContext(),"Please enter a User ID", Toast.LENGTH_LONG).show();
}else if (etPassword.getText().toString().equals("")){
Toast.makeText(getApplicationContext(),"Please enter a password", Toast.LENGTH_LONG).show();
}else{
String user_id = etUserID.getText().toString();
int user_id2 = Integer.parseInt(user_id);
String user_password = etPassword.getText().toString();
int userID = userDetails.getInt("userID", 1);
String password = userDetails.getString("password", "no name");
if (userID == user_id2 && password.equals(user_password)){
startActivity(new Intent(LogOn.this,CrimeMap.class));
}
}
# 1 楼答案
不要试图访问该文件。让android这样做,并将存储的数据加密到共享首选项中。我是说:
你可以使用任何你喜欢的加密,当然你需要用这种方式来解码
另一个选项是存储SHA1加密密码,在身份验证中,将键入的SHA1加密密码与存储的字符串进行比较。您可以使用http://mvnrepository.com/artifact/commons-codec/commons-codec例如:
要解决“红色”问题,需要声明txtid,txtPass。它们应该以某种方式添加到你的布局中。可能是通过编辑布局xml。但即使是通过编程也可以这样做,比如:Input text dialog Android