Question

我们开发了一款可在Google Play上使用的应用，但它有一些小错误。

你知道，有些设备报告我们的应用程序在全新安装时崩溃。

崩溃报告如下：

java.lang.NullPointerException：at com.atry.kil0b1te.sample.MapsActivity2.build_retrofit_and_get_response     （MapsActivity2.java:259）at     com.atry.kil0b1te.sample.MapsActivity2.access $ 100     （MapsActivity2.java:71）at     com.atry.kil0b1te.sample.MapsActivity2 $ 2.run（MapsActivity2.java:163）     在android.os.Handler.handleCallback（Handler.java:761）at     android.os.Handler.dispatchMessage（Handler.java:98）at     android.os.Looper.loop（Looper.java:156）at     android.app.ActivityThread.main（ActivityThread.java:6605）at     java.lang.reflect.Method.invoke（Native Method）at     com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run     （ZygoteInit.java:999）com.android.internal.os.ZygoteInit.main     （ZygoteInit.java:889）

IT指的是这种方法 build_retrofit_and_get_response方法：

private void build_retrofit_and_get_response(String type) {

        String url = "https://maps.googleapis.com/maps/";

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl(url)
                .addConverterFactory(GsonConverterFactory.create())
                .build();

        RetrofitMaps service = retrofit.create(RetrofitMaps.class);

        Call<Example> call = service.getDistanceDuration("metric", origin.latitude + "," + origin.longitude,dest.latitude + "," + dest.longitude, type);

        //showCoordinatesInfo();
        call.enqueue(new Callback<Example>() {
            @Override
            public void onResponse(Response<Example> response, Retrofit retrofit) {

                try {
                    //Remove previous line from map
                    if (line != null) {
                        line.remove();
                    }
                    // This loop will go through all the results and add marker on each location.
                    for (int i = 0; i < response.body().getRoutes().size(); i++) {
                        String distance = response.body().getRoutes().get(i).getLegs().get(i).getDistance().getText();
                        String time = response.body().getRoutes().get(i).getLegs().get(i).getDuration().getText();
                        ShowDistanceDuration.setText("Distance: " + distance + "\nDuration: " + time);
                        String encodedString = response.body().getRoutes().get(0).getOverviewPolyline().getPoints();
                        List<LatLng> list = decodePoly(encodedString);
                        line = mMap.addPolyline(new PolylineOptions()
                                .addAll(list)
                                .width(10)
                                .color(Color.RED)
                                .geodesic(true)
                        );
                    }
                } catch (Exception e) {
                    Log.d("onResponse", "There is an error");
                    e.printStackTrace();
                }
            }

            @Override
            public void onFailure(Throwable t) {
                Log.d("onFailure", t.toString());
            }
        });

        switch(type){
            case "driving":
                btnDriving.setTextColor(getResources().getColor(R.color.active_text));
                btnWalk.setTextColor(getResources().getColor(R.color.black));
                break;
            case "walking":
                btnDriving.setTextColor(getResources().getColor(R.color.black));
                btnWalk.setTextColor(getResources().getColor(R.color.active_text));
                break;
        }

    }

具体而言，第259行是：

Call<Example> call = service.getDistanceDuration("metric", origin.latitude + "," + origin.longitude,dest.latitude + "," + dest.longitude, type);

原点在此方法中初始化：

@Override
    public void onLocationChanged(Location location) {

        origin = new LatLng(location.getLatitude(), location.getLongitude());
        float[] distance = new float[2];

        Location.distanceBetween(origin.latitude, origin.longitude, circle.getCenter().latitude,circle.getCenter().longitude,distance);

        if (distance[0] <= circle.getRadius() && !arrived)
        {
            arrived = true;
            markAsVisited();
            sendNotif();
            arrivalAlert();
        }

        switch (travel_mode){
            case "driving":
                build_retrofit_and_get_response("driving");
                break;
            case "walking":
                build_retrofit_and_get_response("walking");
                break;
        }
    }

这只发生在全新安装上！您对如何解决这次崩溃有任何想法吗？谢谢。

Answer 1

我自己修理了应用程序lol

问题是由我的Java类中的这行代码引起的：

if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            checkLocationPermission();
        }

所以我将该代码移动到应用程序的启动。现在崩溃是固定的。请查看我们的应用here。

应用程序在全新安装时崩溃

1 个答案: