java - GoogleApiAvailability.getErrorDialog(android.app.Activity, int, int)

Question

我遇到一个问题，当我直接在手机上运行应用程序时，应用程序启动成功，但当我在模拟器上尝试它时，它在启动之前崩溃并出现错误:

 01-15 14:30:35.037 3735-3735/com.example.glen.countryinformationapp E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.glen.countryinformationapp, PID: 3735
java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.Dialog com.google.android.gms.common.GoogleApiAvailability.getErrorDialog(android.app.Activity, int, int)' on a null object reference
at com.example.glen.countryinformationapp.MainActivity.onConnectionFailed(MainActivity.java:216)
at com.google.android.gms.common.internal.zzm.zzo(Unknown Source)
at com.google.android.gms.internal.zzaal.zzc(Unknown Source)
at com.google.android.gms.internal.zzaaj.zzf(Unknown Source)
at com.google.android.gms.internal.zzaaj.zza(Unknown Source)
at com.google.android.gms.internal.zzaaj$zzb$1.zzvA(Unknown Source)
at com.google.android.gms.internal.zzaan$zza.zzc(Unknown Source)
at com.google.android.gms.internal.zzaan$zzb.handleMessage(Unknown Source)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

我使用的 Google Plus API 登录仅在模拟器上出现问题:/有什么想法吗？

Answer 1

您需要检查 google 服务 api 在您的模拟器中是否可用。

 public boolean isGooglePlayServicesAvailable(Activity activity) {
    GoogleApiAvailability googleApiAvailability = GoogleApiAvailability.getInstance();
    int status = googleApiAvailability.isGooglePlayServicesAvailable(activity);
    if(status != ConnectionResult.SUCCESS) {
        if(googleApiAvailability.isUserResolvableError(status)) {
              googleApiAvailability.getErrorDialog(activity, status, 1000).show();
        }
        return false;
    }
    return true;
}

如果不可用，则您可以显示一个对话框，表明所需的 Google Play 服务不支持该设备