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

你只需要在表达你的意图时发送额外的信息。

这样地:

Intent intent = new Intent(getApplicationContext(), SecondActivity.class);
intent.putExtra("Variable name", "Value you want to pass");
startActivity(intent);

现在,在SecondActivity的OnCreate方法中,您可以像这样获取额外内容。

如果您发送的值过长:

long value = getIntent().getLongExtra("Variable name which you sent as an extra", defaultValue(you can give it anything));

如果发送的值是字符串:

String value = getIntent().getStringExtra("Variable name which you sent as an extra");

如果发送的值是布尔值:

Boolean value = getIntent().getBooleanExtra("Variable name which you sent as an extra", defaultValue);

其他回答

另一种方法是使用存储数据的公共静态字段,即:

public class MyActivity extends Activity {

  public static String SharedString;
  public static SomeObject SharedObject;

//...

我在类中使用静态字段,并获取/设置它们:

喜欢:

public class Info
{
    public static int ID      = 0;
    public static String NAME = "TEST";
}

要获取值,请在“活动”中使用:

Info.ID
Info.NAME

要设置值:

Info.ID = 5;
Info.NAME = "USER!";

使用捆绑包@链接https://medium.com/@nikhildhyani365/从一个活动到另一个活动的传递数据-18df2a701142//从介质复制

           Intent I =  new Intent(MainActivity.this,Show_Details.class);

            Bundle b = new Bundle();


            int x = Integer.parseInt(age.getText().toString());
            int y = Integer.parseInt(className.getText().toString());

            b.putString("Name",name.getText().toString());

            b.putInt("Age",x);
            b.putInt("ClassName",y);

            I.putExtra("student",b);

            startActivity(I);

使用Intent@链接https://android.jlelse.eu/passing-data-between-activities-using-intent-in-android-85cb097f3016

如果使用kotlin:

在MainActivity1中:

var intent=Intent(this,MainActivity2::class.java)
intent.putExtra("EXTRA_SESSION_ID",sessionId)
startActivity(intent)

在MainActivity2中:

if (intent.hasExtra("EXTRA_SESSION_ID")){
    var name:String=intent.extras.getString("sessionId")
}

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");
}