Android 错误“无法找到显式活动类"

问题描述

我有一个包含多个包的 android 项目.在这种情况下，包的结构是 com.WAPP.SetLocation 是包含我要运行的活动的包.

I have an android project with several packages. The structure of the packages in this case is com.WAPP.SetLocation is the package that contains the activity I want to run.

在我的清单中，com.WAPP 被视为基础包:

In my manifest, com.WAPP is considered the base package:

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="com.WAPP"
      android:versionCode="1"
      android:versionName="1.0">

我的活动在清单中声明为:

My activities are declared in my manifest as:

<activity android:name=".mainScreenActivity"></activity>
<activity android:name=".SetLocation.setLocationActivity"></activity>

mainScreen 活动显示正常，因为它位于 com.WAPP 包内.但是当我尝试运行 setLocationActivity 时，我得到了无法找到显式类的错误.这是我如何获得意图参数:

The mainScreen activity displays fine, since it is inside the com.WAPP package. But when I try to run the setLocationActivity, I get the unable to find explicit class error. Here is how I have the intent parameters:

Intent i = new Intent();
            i.setClassName("com.WAPP.SetLocation",
                           "com.WAPP.SetLocation.setLocationActivity");
            startActivity(i);

推荐答案

第一个参数是应用程序包不是活动所在的包.

The first parameter is application package not the package where the activity is.

您可以像这样调用 Activity.

You can invoke the Activity like this.

Intent i = new Intent();
i.setClassName("com.WAPP",
               "com.WAPP.SetLocation.setLocationActivity");
startActivity(i);

最好是因为 SYLARRR 建议让 Android 自动为您解决这个问题.因此调用为..

It is preferred as SYLARRR suggested to have Android automatically figure that out for you. Hence the call as..

startActivity(new Intent(this, setLocationActivity.class));

根据 Java 标准，建议将包名称全部小写，并将类名称设为 CamelCased.

It's recommended per java standards to have the package name all lower-cased and the class name as CamelCased.

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