【发布时间】：2013-12-17 05:48:36
【问题描述】：
我正在尝试在我的应用程序中设置应用内计费。我没有走多远，在尝试启动我的 IabHelper 时遇到了空指针异常。我正在关注this google tutorial。
import com.iabtest.util.IabHelper;
import com.iabtest.util.IabResult;
public class MainActivity extends Activity
{
IabHelper mHelper;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
String base64EncodedPublicKey = "My_secret_key";
mHelper = new IabHelper(this, base64EncodedPublicKey);
mHelper.enableDebugLogging(true); //Turned on to try to help solve the issue
Log.d("TEST", "Starting setup.");
mHelper.startSetup(new IabHelper.OnIabSetupFinishedListener()
{
public void onIabSetupFinished(IabResult result)
{
Log.d("TEST", "Setup finished.");
if(!result.isSuccess())
{
// Oh noes, there was a problem.
Log.d("TEST", "Problem setting up in-app billing: " + result);
return;
}
//IAB SET UP!
Log.d("TEST", "IAB ready");
}
});
}
}
在下面的 logcat 中，似乎在第 267 行的 IabHelper.java 中触发了空指针异常。由于这是 google 代码，我不确定如何解决此问题。这是第 267 行。
if (!mContext.getPackageManager().queryIntentServices(serviceIntent, 0).isEmpty()) {
这是我的 LogCat 错误：
12-17 05:28:29.908: E/Trace(1478): error opening trace file: No such file or directory (2)
12-17 05:28:30.898: W/GooglePlayServicesUtil(1478): Google Play Store is missing.
12-17 05:28:31.838: D/TEST(1478): Starting setup.
12-17 05:28:31.838: D/IabHelper(1478): Starting in-app billing setup.
12-17 05:28:31.848: D/AndroidRuntime(1478): Shutting down VM
12-17 05:28:31.848: W/dalvikvm(1478): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
12-17 05:28:31.878: E/AndroidRuntime(1478): FATAL EXCEPTION: main
12-17 05:28:31.878: E/AndroidRuntime(1478): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.iabtest/com.iabtest.MainActivity}: java.lang.NullPointerException
12-17 05:28:31.878: E/AndroidRuntime(1478): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
12-17 05:28:31.878: E/AndroidRuntime(1478): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
12-17 05:28:31.878: E/AndroidRuntime(1478): at android.app.ActivityThread.access$600(ActivityThread.java:141)
12-17 05:28:31.878: E/AndroidRuntime(1478): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
12-17 05:28:31.878: E/AndroidRuntime(1478): at android.os.Handler.dispatchMessage(Handler.java:99)
12-17 05:28:31.878: E/AndroidRuntime(1478): at android.os.Looper.loop(Looper.java:137)
12-17 05:28:31.878: E/AndroidRuntime(1478): at android.app.ActivityThread.main(ActivityThread.java:5041)
12-17 05:28:31.878: E/AndroidRuntime(1478): at java.lang.reflect.Method.invokeNative(Native Method)
12-17 05:28:31.878: E/AndroidRuntime(1478): at java.lang.reflect.Method.invoke(Method.java:511)
12-17 05:28:31.878: E/AndroidRuntime(1478): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
12-17 05:28:31.878: E/AndroidRuntime(1478): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
12-17 05:28:31.878: E/AndroidRuntime(1478): at dalvik.system.NativeStart.main(Native Method)
12-17 05:28:31.878: E/AndroidRuntime(1478): Caused by: java.lang.NullPointerException
12-17 05:28:31.878: E/AndroidRuntime(1478): at com.iabtest.util.IabHelper.startSetup(IabHelper.java:267)
12-17 05:28:31.878: E/AndroidRuntime(1478): at com.iabtest.MainActivity.onCreate(MainActivity.java:112)
12-17 05:28:31.878: E/AndroidRuntime(1478): at android.app.Activity.performCreate(Activity.java:5104)
12-17 05:28:31.878: E/AndroidRuntime(1478): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
12-17 05:28:31.878: E/AndroidRuntime(1478): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
12-17 05:28:31.878: E/AndroidRuntime(1478): ... 11 more
编辑：我仍然不确定错误的原因。但是，我发现了一个比谷歌文档更好的有用教程。 http://www.techotopia.com/index.php/Integrating_Google_Play_In-app_Billing_into_an_Android_Application_%E2%80%93_A_Tutorial
【问题讨论】：
-
你在课堂上添加
onActivityResult了吗？ -
我没有。我正在按照上面链接的教程进行操作，但它没有包含在 ActivityResult 中。
-
什么是 com.iabtest.MainActivity.onCreate(MainActivity.java:112)？
-
第 112 行是 mHelper.startSetup(new IabHelper.OnIabSetupFinishedListener() 为了便于阅读，我在 onCreate 方法中删除了一些其他内容
-
您的项目中添加了google play库吗？请添加您的完整代码，以便人们理解问题。
标签： android in-app-purchase in-app-billing