java 错误：找不到符号：方法 startActivity
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/10099600/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Error: cannot find symbol: method startActivity
提问by user1325591
I am developing an application in order to connect to Google Navigator by the following code..
我正在开发一个应用程序，以便通过以下代码连接到 Google Navigator。
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.Uri;
public static void Call_GoogleMapsNavigation(int longitud,int latitud)
{
Intent i = new Intent(android.content.Intent.ACTION_VIEW,
Uri.parse("google.navigation:q=" +latitud+ ","+longitud+""));
Context.startActivity(i);
}
... but I get the following error:
...但我收到以下错误：
Error returned:
错误返回：
GWDCPSET_GlobalProcedures_MobileDevice.java:1223: cannot find symbol
symbol : method startActivity(android.content.Intent)
location: class antay.cfsatv30.wdgen.GWDCPSET_GlobalProcedures_MobileDevice
startActivity(i);
^
I can not find the solution to the problem ...
我找不到问题的解决方案......
Thank you very much,
非常感谢你，
回答by ρяσ?ρ?я K
Try this way :
试试这个方法：
Context oContext;
oContext= mContext;
Intent i = new Intent(android.content.Intent.ACTION_VIEW,
Uri.parse("google.navigation:q=" + latitud+ "," + longitud));
oContext.startActivity(i);
回答by ChrisCarneiro
To explain a bit further the answer above.
What it means is that you can't/shouldn't not call statically startActivity(intent).
进一步解释一下上面的答案。这意味着你不能/不应该静态调用startActivity(intent).
Context.startActivity(intent); //wrong notice capital 'C'
You need a Context instance.
您需要一个 Context 实例。
So, the simplest thing to do, is add a parameter to your static method: (Notice lowercase 'c' as a convention for method names in Java)
因此，最简单的做法是向静态方法添加一个参数：（ 注意小写的“c”作为 Java 中方法名称的约定）
public static void call_GoogleMapsNavigation(final Context context, int longitud,int latitud) {
...
context.startActivity(i); //right
}
So for example in your activity or any component in your app that holds a reference to a context instance, you call your method as follows
因此，例如在您的 Activity 或应用程序中包含对上下文实例的引用的任何组件中，您可以按如下方式调用您的方法
For simplicity I assume you call it from an activity(always holds a reference to a context):
为简单起见，我假设您从活动中调用它（始终持有对上下文的引用）：
MainActivity extends AppCompatActivity {
OnCreate(Bundle savedInstance) {
<YourHelperClass>.callGoogleMapsNavigation(this, 23, 44); //static call
}
}
Hope this helps :)
希望这可以帮助 ：）
