我有一个场景,在通过登录页面登录后,每个活动都会有一个注销按钮。
单击注销时,我将传递要注销的登录用户的会话id。有人能指导我如何让所有活动都可以使用会话id吗?
本案的任何替代方案
我有一个场景,在通过登录页面登录后,每个活动都会有一个注销按钮。
单击注销时,我将传递要注销的登录用户的会话id。有人能指导我如何让所有活动都可以使用会话id吗?
本案的任何替代方案
当前回答
试试看:
当前活动.java
Intent intent = new Intent(currentActivity.this, TargetActivity.class);
intent.putExtra("booktype", "favourate");
startActivity(intent);
目标活动.java
Bundle b = getIntent().getExtras();
String typesofbook = b.getString("booktype");
其他回答
你可以用心工作。
String sessionId = "my session id";
startActivity(new Intent(getApplicationContext(),SignOutActivity.class).putExtra("sessionId",sessionId));
/*
* If you are from transferring data from one class that doesn't
* extend Activity, then you need to do something like this.
*/
public class abc {
Context context;
public abc(Context context) {
this.context = context;
}
public void something() {
context.startactivity(new Intent(context, anyone.class).putextra("key", value));
}
}
通过捆绑对象从此活动传递参数启动另一个活动
Intent intent = new Intent(getBaseContext(), YourActivity.class);
intent.putExtra("USER_NAME", "xyz@gmail.com");
startActivity(intent);
检索其他活动(YourActivity)
String s = getIntent().getStringExtra("USER_NAME");
这适用于简单类型的数据类型。但如果您想在活动之间传递复杂的数据,则需要首先对其进行序列化。
这里有员工模型
class Employee{
private String empId;
private int age;
print Double salary;
getters...
setters...
}
您可以使用google提供的Gson-lib来序列化复杂的数据这样地
String strEmp = new Gson().toJson(emp);
Intent intent = new Intent(getBaseContext(), YourActivity.class);
intent.putExtra("EMP", strEmp);
startActivity(intent);
Bundle bundle = getIntent().getExtras();
String empStr = bundle.getString("EMP");
Gson gson = new Gson();
Type type = new TypeToken<Employee>() {
}.getType();
Employee selectedEmp = gson.fromJson(empStr, type);
这是我的最佳实践,当项目规模巨大且复杂时,它会帮助很大。
假设我有两个活动,LoginActivity和HomeActivity。我想将2个参数(用户名和密码)从LoginActivity传递到HomeActivity。
首先,我创建HomeIntent
public class HomeIntent extends Intent {
private static final String ACTION_LOGIN = "action_login";
private static final String ACTION_LOGOUT = "action_logout";
private static final String ARG_USERNAME = "arg_username";
private static final String ARG_PASSWORD = "arg_password";
public HomeIntent(Context ctx, boolean isLogIn) {
this(ctx);
//set action type
setAction(isLogIn ? ACTION_LOGIN : ACTION_LOGOUT);
}
public HomeIntent(Context ctx) {
super(ctx, HomeActivity.class);
}
//This will be needed for receiving data
public HomeIntent(Intent intent) {
super(intent);
}
public void setData(String userName, String password) {
putExtra(ARG_USERNAME, userName);
putExtra(ARG_PASSWORD, password);
}
public String getUsername() {
return getStringExtra(ARG_USERNAME);
}
public String getPassword() {
return getStringExtra(ARG_PASSWORD);
}
//To separate the params is for which action, we should create action
public boolean isActionLogIn() {
return getAction().equals(ACTION_LOGIN);
}
public boolean isActionLogOut() {
return getAction().equals(ACTION_LOGOUT);
}
}
以下是我如何在LoginActivity中传递数据
public class LoginActivity extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
String username = "phearum";
String password = "pwd1133";
final boolean isActionLogin = true;
//Passing data to HomeActivity
final HomeIntent homeIntent = new HomeIntent(this, isActionLogin);
homeIntent.setData(username, password);
startActivity(homeIntent);
}
}
最后一步,这里是我如何在HomeActivity中接收数据
public class HomeActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
//This is how we receive the data from LoginActivity
//Make sure you pass getIntent() to the HomeIntent constructor
final HomeIntent homeIntent = new HomeIntent(getIntent());
Log.d("HomeActivity", "Is action login? " + homeIntent.isActionLogIn());
Log.d("HomeActivity", "username: " + homeIntent.getUsername());
Log.d("HomeActivity", "password: " + homeIntent.getPassword());
}
}
完成!酷:)我只是想分享我的经验。如果你在做小项目,这应该不是大问题。但当你在大项目上工作时,当你想进行重构或修复bug时,这真的很痛苦。
源类:
Intent myIntent = new Intent(this, NewActivity.class);
myIntent.putExtra("firstName", "Your First Name Here");
myIntent.putExtra("lastName", "Your Last Name Here");
startActivity(myIntent)
目标类(NewActivity类):
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view);
Intent intent = getIntent();
String fName = intent.getStringExtra("firstName");
String lName = intent.getStringExtra("lastName");
}