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
要访问所有活动中的会话id,必须将会话id存储在SharedPreference中。
请参见下面我用于管理会话的类,您也可以使用该类。
import android.content.Context;
import android.content.SharedPreferences;
public class SessionManager {
public static String KEY_SESSIONID = "session_id";
public static String PREF_NAME = "AppPref";
SharedPreferences sharedPreference;
SharedPreferences.Editor editor;
Context mContext;
public SessionManager(Context context) {
this.mContext = context;
sharedPreference = context.getSharedPreferences(PREF_NAME, Context.MODE_PRIVATE);
editor = sharedPreference.edit();
}
public String getSessionId() {
return sharedPreference.getString(KEY_SESSIONID, "");
}
public void setSessionID(String id) {
editor.putString(KEY_SESSIONID, id);
editor.commit();
editor.apply();
}
}
//Now you can access your session using below methods in every activities.
SessionManager sm = new SessionManager(MainActivity.this);
sm.getSessionId();
//below line us used to set session id on after success response on login page.
sm.setSessionID("test");
其他回答
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")
}
Intent intent = new Intent(YourCurrentActivity.this, YourActivityName.class);
intent.putExtra("NAme","John");
intent.putExtra("Id",1);
startActivity(intent);
您可以在其他活动中检索它。两种方式:
int id = getIntent.getIntExtra("id", /* defaltvalue */ 2);
第二种方法是:
Intent i = getIntent();
String name = i.getStringExtra("name");
使用回调在活动之间进行新的实时交互:
-步骤01:实现共享接口
public interface SharedCallback {
public String getSharedText(/*you can define arguments here*/);
}
-步骤02:实现共享类
final class SharedMethode {
private static WeakReference<Context> mContext;
private static SharedMethode sharedMethode = new SharedMethode();
private SharedMethode() {
super();
}
public static SharedMethode getInstance() {
return sharedMethode;
}
public void setContext(Context context) {
if (mContext != null)
return;
mContext = new WeakReference<Context>(context);
}
public boolean contextAssigned() {
return mContext != null && mContext.get() != null;
}
public Context getContext() {
return mContext.get();
}
public void freeContext() {
if (mContext != null) mContext.clear();
mContext = null;
}
}
-步骤03::在第一个活动中玩代码
public class FirstActivity extends Activity implements SharedCallback {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_layout);
// call playMe from here or there
playMe();
}
private void playMe() {
SharedMethode.getInstance().setContext(this);
Intent intent = new Intent(this, SecondActivity.class);
startActivity(intent);
}
@Override
public String getSharedText(/*passed arguments*/) {
return "your result";
}
}
-步骤04::在SecondActivity中完成游戏
public class SecondActivity extends Activity {
private SharedCallback sharedCallback;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.your_layout);
if (SharedMethode.getInstance().contextAssigned()) {
if (SharedMethode.getInstance().getContext() instanceof SharedCallback)
sharedCallback = (SharedCallback) SharedMethode.getInstance().getContext();
// to prevent memory leak
SharedMethode.freeContext();
}
// You can now call your implemented methodes from anywhere at any time
if (sharedCallback != null)
Log.d("TAG", "Callback result = " + sharedCallback.getSharedText());
}
@Override
protected void onDestroy() {
sharedCallback = null;
super.onDestroy();
}
}
步骤05::您还可以实现backword回调(从First到Second),以从SecondAvctivity获取一些结果或调用一些方法
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;
//...
第一项活动:
Intent intent = new Intent(getApplicationContext(), ClassName.class);
intent.putExtra("Variable name", "Value you want to pass");
startActivity(intent);
第二项活动:
String str= getIntent().getStringExtra("Variable name which you sent as an extra");