Question

我在尝试展示java.lang.IllegalStateException时收到DialogFragment。这是显示此对话框的流程：

使用Android Volley调用服务器API
来自HTTP Post的回复
解析JSON并决定如何处理它（在后台线程中）
使用LocalBroadcast Intent，向Broadcast

Activity

Activity处理Broadcast并检查应用是否位于前台
如果应用位于前台，则显示DialogFragment

我认为检查应用程序是否在前台是否足以处理此错误？

处理此IllegalStateException的正确方法是什么？

活动w /显示对话框方法

public void showUpdateAppDialog() {
    if (Helpers.isAppInForeground(this)) {
        mUpdateAppDialog = UpdateAppDialog.newInstance();
        mUpdateAppDialog.show(mFm, GlobalVars.TAG_UPDATE_APP_DIALOG);
    }
}

带有响应处理程序的Android Volley HTTP Post调用

public void versionCheck() {
    try {
        JSONObject obj = new JSONObject();
        obj.put(GlobalVars.KEY_PLATFORM, "android");
        obj.put(GlobalVars.KEY_VERSION, Integer.toString(mPrefs.getAppVersion()));

        Response.Listener<JSONObject> responseListener = new Response.Listener<JSONObject>() {
            @Override
            public void onResponse(final JSONObject response) {
                Log.v(TAG_VOLLEY_RESPONSE, GlobalVars.DEST_VERSION_CHECK + ": " + response.toString());

                new Thread(new Runnable() {
                    public void run() {
                        boolean updated = false;

                        try {
                            if (doesResponseContainError(response)) return;

                            if (response.has(GlobalVars.EVENT_VERSION_CHECK)) {
                                updated = Boolean.valueOf(response.getString(GlobalVars
                                        .EVENT_VERSION_CHECK));
                            }
                        }
                        catch (JSONException e) { e.printStackTrace(); }
                        finally {
                            Intent intent = new Intent(GlobalVars.EVENT_RECEIVER);
                            intent.putExtra(GlobalVars.KEY_EVENT, new ArrayList<>(Arrays.asList(
                                    GlobalVars.EVENT_HIDE_UPDATING_ICON,
                                    GlobalVars.EVENT_VERSION_CHECK)));
                            intent.putExtra(GlobalVars.KEY_IS_UPDATED, updated);
                            LocalBroadcastManager.getInstance(mContext).sendBroadcast(intent);
                        }
                    }
                }).start();
            }
        };

        sendPost(GlobalVars.DEST_VERSION_CHECK, obj, GlobalVars.DEST_VERSION_CHECK, responseListener);
    }
    catch (JSONException e) { e.printStackTrace(); }
}

app是否在前台检查

public static boolean isAppInForeground(Context context) {
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    List<ActivityManager.RunningAppProcessInfo> tasks = am.getRunningAppProcesses();
    return tasks.get(0).processName.equalsIgnoreCase(context.getPackageName());
}

堆栈跟踪

java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
   at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1365)
   at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1383)
   at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:636)
   at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:615)
   at android.support.v4.app.DialogFragment.show(DialogFragment.java:138)
   at com.walintukai.lovelup.MainActivity.showUpdateAppDialog(MainActivity.java:991)
   at com.walintukai.lovelup.MainActivity.onVersionCheck(MainActivity.java:1269)
   at com.walintukai.lovelup.MainActivity.access$1200(MainActivity.java:90)
   at com.walintukai.lovelup.MainActivity$10.onReceive(MainActivity.java:1142)
   at android.support.v4.content.LocalBroadcastManager.executePendingBroadcasts(LocalBroadcastManager.java:297)
   at android.support.v4.content.LocalBroadcastManager.access$000(LocalBroadcastManager.java:46)
   at android.support.v4.content.LocalBroadcastManager$1.handleMessage(LocalBroadcastManager.java:116)
   at android.os.Handler.dispatchMessage(Handler.java:102)
   at android.os.Looper.loop(Looper.java:146)
   at android.app.ActivityThread.main(ActivityThread.java:5748)
   at java.lang.reflect.Method.invokeNative(Method.java)
   at java.lang.reflect.Method.invoke(Method.java:515)
   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1291)
   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1107)
   at dalvik.system.NativeStart.main(NativeStart.java)

在收到来自HTTP Post的响应后显示DialogFragment有时会使用IllegalStateException崩溃应用程序

0 个答案: