如何在Android中管理多个活动互动? [英] How to manage multiple activity interactions in Android?

问题描述

在我的活动中，我从活动A(在后堆栈A-> B中)调用活动B，然后再从活动B(在后堆栈A-> B-> C中)调用活动C，以反映出一些结果活动A，而不是如何通过单击按钮跳转到活动A，并携带活动C的一些结果以反映回活动A(同时清除活动B，C的堆栈)

解决方案

选项1 :您可以链接startActivityForResult()的调用并在onActivityResult()回调中展开"该链接.

• 活动A调用startActivityForResult()启动活动B
• 活动B调用startActivityForResult()启动活动C
• 在活动C中先调用setResult(RESULT_OK)，然后再调用finish()
• 在活动B的onActivityResult()中收到活动C的结果.处理结果(如果需要).
• 在活动B中依次调用setResult(RESULT_OK)和finish()
• 在活动A的onActivityResult()中收到活动B的结果.处理结果.

选项2 :再次启动活动A，但向意图添加标志.

Intent intent = new Intent(this, ActivityA.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// add more data to Intent
startActivity(intent);
finish();

活动A的onNewIntent()方法中将收到此意图.

编辑

选项3::使用LocalBroadcastManager在本地发送广播(仅在您的过程中).这要求在活动A中动态注册BroadcastReceiver，然后从活动C发送广播.您仍然需要使用上述两种技术之一返回活动A并清除堆栈；否则，您将无法使用它.这只是改变了将数据传输回活动A的方式.

In my activity, i'm calling activity B from activity A (in back stack A->B), than again activity C from B (in back stack A-> B-> C) for some result to reflect on activity A, than how to jump to activity A on button click with carrying some result from activity C to reflect back in activity A(while clearing back stack of activity B,C)

解决方案

Option 1: You can chain calls of startActivityForResult() and "unwind" the chain in the onActivityResult() callbacks.

• Activity A calls startActivityForResult() to start Activity B
• Activity B calls startActivityForResult() to start Activity C
• Call setResult(RESULT_OK) and then finish() in Activity C
• Result of Activity C is received in onActivityResult() of Activity B. Process the result (if needed).
• Call setResult(RESULT_OK) and then finish() in Activity B
• Result of Activity B is received in onActivityResult() of Activity A. Process the result.

Option 2: Start Activity A again, but add flags to the intent.

Intent intent = new Intent(this, ActivityA.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
// add more data to Intent
startActivity(intent);
finish();

This intent will be received in the onNewIntent() method of Activity A.

EDIT

Option 3: Use LocalBroadcastManager to send broadcasts locally (within your process only). This requires registering a BroadcastReceiver dynamically in Activity A, then sending the broadcast from Activity C. You will still need to use one of the two techniques above to get back to Activity A and clear the stack; this just changes how the data is transmitted back to Activity A.

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