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我正在尝试通过此处的此链接实施 GA 广告系列测量 https://developers.google.com/analytics/devguides/collection/android/v2/campaigns#campaign-params

所以,我已经完成了一切,但它NullpointerException在我的代码中给出了。

// Get the intent that started this Activity.
        Intent installIntent = this.getIntent();
        Uri Installuri = installIntent.getData();

        EasyTracker.getInstance().setContext(this);
        if (installIntent != null) {
            EasyTracker.getTracker().setCampaign(Installuri.getPath()); //line 82
          }

那就是代码,它应该进行一般跟踪。没什么特别的。然而,在上面提到的第 82 行,它会抛出 NullPointerException。这是日志猫:

06-23 19:54:54.864: E/AndroidRuntime(13773):    at android.os.Looper.loop(Looper.java:137)
06-23 19:54:54.864: E/AndroidRuntime(13773):    at android.app.ActivityThread.main(ActivityThread.java:4441)
06-23 19:54:54.864: E/AndroidRuntime(13773):    at java.lang.reflect.Method.invokeNative(Native Method)
06-23 19:54:54.864: E/AndroidRuntime(13773):    at java.lang.reflect.Method.invoke(Method.java:511)
06-23 19:54:54.864: E/AndroidRuntime(13773):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-23 19:54:54.864: E/AndroidRuntime(13773):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-23 19:54:54.864: E/AndroidRuntime(13773):    at dalvik.system.NativeStart.main(Native Method)
06-23 19:54:54.864: E/AndroidRuntime(13773): Caused by: java.lang.NullPointerException
06-23 19:54:54.864: E/AndroidRuntime(13773):    at uk.co.futurelite.elite.drum.machine.Main.onCreate(Main.java:82)
06-23 19:54:54.864: E/AndroidRuntime(13773):    at android.app.Activity.performCreate(Activity.java:4465)
06-23 19:54:54.864: E/AndroidRuntime(13773):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
06-23 19:54:54.864: E/AndroidRuntime(13773):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1931)
06-23 19:54:54.864: E/AndroidRuntime(13773):    ... 11 more

IF所以,如果不是这样,我会用语句检查它null

if (installIntent != null) {

那么,它抛出 NullPointerException 会发生什么?当它通过IF声明时。

PS。我确实完成了它直到最后,虽然可能我必须将一些东西传递给广播接收器,但我可以在 logcat 中看到它成功接收到活动,如下所示:

06-23 19:54:56.544: W/GAV2(13773): Thread[GAThread,5,main]: Service unavailable (code=1), will retry.
06-23 19:54:56.824: I/GAV2(13773): Thread[GAThread,5,main]: Campaign found: utm_source%3Dxdebugx%26utm_medium%3Dbutton

但是应用程序本身崩溃并且无法启动。

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1 回答 1

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在尝试调用 .getPath() 之前,您需要检查 URI 是否为空。在您提到的文档中,它是这样写的:

if (intent.getData() != null) {
  EasyTracker.getTracker().setCampaign(uri.getPath());
}

使用代码片段中的样式,它应该如下所示:

// Get the intent that started this Activity.
Intent installIntent = this.getIntent();
Uri Installuri = installIntent.getData();

EasyTracker.getInstance().setContext(this);
if (Installuri != null) {
    EasyTracker.getTracker().setCampaign(Installuri.getPath()); //line 82
}
于 2013-06-24T04:11:51.760 回答