java 在android中通过意图传递包时在主要活动上获取包
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Getting bundle on Main activity when passing bundles by intent in android
提问by Darian B
So the problem I am having is that my app keeps crashing on launch, I have two activities. Activity A and Activity B. My app launches on Activity A but I have created a bundle in Activity B and I am sending it to Activity A. So when it launches the bundle is empty or null so it crashes, how do i fix this? thanks.
所以我遇到的问题是我的应用程序在启动时一直崩溃，我有两个活动。Activity A 和 Activity B。我的应用程序在 Activity A 上启动，但我在 Activity B 中创建了一个包，我将它发送到 Activity A。所以当它启动时包为空或为空，所以它崩溃了，我该如何解决这个问题？谢谢。
This is in Activity A (Launching Activity) in on create
这是在创建的活动 A（启动活动）中
Bundle extras = getIntent().getExtras();
Title = extras.getString("Title");
Description = extras.getString("Description");
Price = extras.getString("Price");
Availability = extras.getString("Availability");
Then we have me creating the bundle in Activity B
然后我们让我在活动 B 中创建包
Intent intent = new Intent(B.this, A.class);
Bundle extras = new Bundle();
extras.putString("Title", PostTitle);
extras.putString("Description", PostDescription);
extras.putString("Price", PostPrice);
extras.putString("Availability", PostAvail);
intent.putExtras(extras);
startActivity(intent);
回答by Simon
I would suggest the following:
我建议如下：
A. Use Bundle from Intent:
A. 使用来自 Intent 的 Bundle：
Intent pIntent = new Intent(this, JustaClass.class);
Bundle extras = pIntent.getExtras();
extras.putString(key, value);
B. Create a new Bundle:
B. 创建一个新的 Bundle：
Intent pIntent = new Intent(this, JustaClass.class);
Bundle pBundle = new Bundle();
pBundle.putString(key, value);
mIntent.putExtras(pBundle);
C. Use putExtra() method of the Intent:
C. 使用 Intent 的 putExtra() 方法：
Intent pIntent = new Intent(this, JustaClass.class);
pIntent.putExtra(key, value);
Finally in the launched Activity, you can read them hrough:
最后在启动的 Activity 中，您可以通过以下方式阅读它们：
String value = getIntent().getExtras().getString(key)
I just used Strings as an example for passing, I refer to Bundleand Intent.
