java - runOnUiThread 上的空指针异常

Question

我收到了用户的错误报告，但我不知道我的代码出了什么问题。 logcat 是这样的:

java.lang.NullPointerException
at com.laurenswuyts.find.it.MainActivity$LoadPlaces$1.run(MainActivity.java:299)
at android.app.Activity.runOnUiThread(Activity.java:4244)
at com.laurenswuyts.find.it.MainActivity$LoadPlaces.onPostExecute(MainActivity.java:293)
at com.laurenswuyts.find.it.MainActivity$LoadPlaces.onPostExecute(MainActivity.java:1)
at android.os.AsyncTask.finish(AsyncTask.java:602)
at android.os.AsyncTask.access$600(AsyncTask.java:156)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:615)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4697)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
at dalvik.system.NativeStart.main(Native Method)

这是关于这段代码:

protected void onPostExecute(String file_url) {
            // dismiss the dialog after getting all products
            pDialog.dismiss();
            // updating UI from Background Thread
            runOnUiThread(new Runnable() {
                public void run() {
                    /**
                     * Updating parsed Places into LISTVIEW
                     * */
                    // Get json response status
                    String status = nearPlaces.status;

                    // Check for all possible status
                    if(status.equals("OK")){
                        // Successfully got places details
                        if (nearPlaces.results != null) {

                            // loop through each place
                            for (Place p : nearPlaces.results) {

有人可以帮助我吗？我真的被这个问题困住了......

Answer 1

日志告诉你

(MainActivity.java:299)

这意味着MainActivity的第299行

因为这一行是:

String status = nearPlaces.status;

这仅仅意味着nearPlaces为空...我们无能为力来解决这个问题;-)

你应该用一些数据初始化它!