Question

当用户拒绝更新Google Play服务时，您如何正确关闭活动？我正在使用makeGooglePlayServicesAvailable()，因为它似乎很方便，但我没有找到很多使用它的例子。

我在checkGooglePlayServices()和onCreate()中使用onResume()（下面的代码）。

public class MainScreen extends Activity {
    private static final String TAG = "MainScreen";

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState); 

        checkGooglePlayServices();
    }

    @Override
    protected void onResume() {
        super.onResume();
        checkGooglePlayServices();
    }

    void checkGooglePlayServices()
    {
        GoogleApiAvailability.getInstance()
         .makeGooglePlayServicesAvailable(this)
         .addOnSuccessListener(new OnSuccessListener<Void>() {
            @Override
            public void onSuccess(Void ignored) {
                    Log.d(TAG,"makeGooglePlayServicesAvailable().onSuccess()");

                // GPS available; do something useful 

            }
        }).addOnFailureListener(this,new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {

                Log.d(TAG,"makeGooglePlayServicesAvailable().onFailure()");
                e.printStackTrace();

                Toast.makeText(MainScreen.this,
                    "Google Play services upgrade required", 
                    Toast.LENGTH_SHORT).show();

                // can't proceed without GPS; quit

                MainScreen.this.finish(); // this causes a crash
            }
        });
    }
}

调用finish()时应用程序崩溃：

com.example E/AndroidRuntime: FATAL EXCEPTION: main
  Process: com.example, PID: 5336
  java.lang.RuntimeException: Unable to destroy activity {com.example/com.example.MainScreen}: java.lang.IllegalStateException: Task is already complete
      at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:4438)
      at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:4456)
      ...
   Caused by: java.lang.IllegalStateException: Task is already complete
      at com.google.android.gms.common.internal.zzbo.zza(Unknown Source:8)
      at com.google.android.gms.tasks.zzn.zzDH(Unknown Source:8)
      at com.google.android.gms.tasks.zzn.setException(Unknown Source:9)
      at com.google.android.gms.tasks.TaskCompletionSource.setException(Unknown Source:2)
      ...

Answer 1

我认为你正在按下＆＃34;返回＆＃34;取消GPS更新请求。错误发生在对onDestroy()超级电话的调用上。这似乎表明Android已经预计无法继续下去并且已经关闭了。（这只是猜测。）

无论如何，我无法确定使用失败侦听器回调来关闭事物的优雅方式，但这是一种稍微不同的方法仍然使用GoogleApiAvailability。我已经对此进行了测试，似乎有效。

将checkGooglePlayServices()替换为以下内容：

private static final int GPS_REQUEST_CODE = 1; // arbitrary code

void checkGooglePlayServices() {
    GoogleApiAvailability api = GoogleApiAvailability.getInstance();
    int status = api.isGooglePlayServicesAvailable(this);
    if (status != ConnectionResult.SUCCESS) {
        if (api.isUserResolvableError(status)) {
            // onActivityResult() will be called with GPS_REQUEST_CODE
            Dialog dialog = api.getErrorDialog(this, status, GPS_REQUEST_CODE,
                    new DialogInterface.OnCancelListener() {
                        @Override
                        public void onCancel(DialogInterface dialog) {
                            // GPS update was cancelled.
                            // Do toast or dialog (probably better to do) here.
                            finish();
                        }
                    });
            dialog.show();
        } else {
            // unrecoverable error
        }
    }
}

此代码可避免回调，但仍可让您检查GPS的可用性。 Here是文档。

Here与示例应用中的方法相同。

如果您想继续使用您拥有的代码，可以执行以下操作，但我更喜欢上述操作来捕获崩溃并隐藏用户的肮脏。

@Override
public void onDestroy() {
    try {
        super.onDestroy();
    } catch (IllegalStateException e) {
        e.printStackTrace();
    }
}

Answer 2

发现这个片段来自 https://www.codota.com/code/java/methods/com.google.android.gms.common.GoogleApiAvailability/makeGooglePlayServicesAvailable

public static void checkPlayServices(Activity activity) {
  final GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance();
  int errorCode = apiAvailability.isGooglePlayServicesAvailable(activity);
  if (errorCode != ConnectionResult.SUCCESS) {
    if (apiAvailability.isUserResolvableError(errorCode)) {
      apiAvailability.makeGooglePlayServicesAvailable(activity);
    } else {
      Toast.makeText(activity, R.string.push_error_device_not_compatible, Toast.LENGTH_SHORT).show();
    }
  }
}

处理取消makeGooglePlayServicesAvailable

2 个答案: