Android 从主屏幕启动时intent.getStringExtra上的NPE_Android

Android 从主屏幕启动时intent.getStringExtra上的NPE

android

Android 从主屏幕启动时intent.getStringExtra上的NPE,android,Android,在运行Android 5.0及以上版本的某些设备上，当我的应用程序从主屏幕打开并显示以下消息时，它将崩溃： java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference at com.imincode.menitiplus.MainActivity.loadSelected

在运行Android 5.0及以上版本的某些设备上，当我的应用程序从主屏幕打开并显示以下消息时，它将崩溃：

java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference
at com.imincode.menitiplus.MainActivity.loadSelectedIntent(MainActivity.java:229)
at com.imincode.menitiplus.MainActivity.onNewIntent(MainActivity.java:213)
at android.app.Instrumentation.callActivityOnNewIntent(Instrumentation.java:1233)
at android.app.ActivityThread.deliverNewIntents(ActivityThread.java:2462)
at android.app.ActivityThread.performNewIntents(ActivityThread.java:2475)
at android.app.ActivityThread.handleNewIntent(ActivityThread.java:2484)
at android.app.ActivityThread.access$1600(ActivityThread.java:148)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1364)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5312)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)

这是导致错误的代码

private void loadSelectedIntent(Intent intent){
        if ((intent != null) && (intent.getExtras() != null)){
            Fragment fragment = null;
            FragmentManager fManager = this.getSupportFragmentManager();
            FragmentTransaction transaction = fManager.beginTransaction();
            Bundle bundle;
            if (intent.getStringExtra("intentCaller").equals("expensesRecurring")){
                fragment = new MenuNotifications();
                bundle = new Bundle();
                bundle.putString("tab", "0");
                fragment.setArguments(bundle);
                transaction.replace(R.id.container, fragment, "fragmentMenuNotifications");
                transaction.addToBackStack(null);
                transaction.commit();
            }else if (intent.getStringExtra("intentCaller").equals("creditCard")){
                fragment = new MenuNotifications();
                bundle = new Bundle();
                bundle.putString("tab", "1");
                fragment.setArguments(bundle);
                transaction.replace(R.id.container, fragment, "fragmentMenuNotifications");
                transaction.addToBackStack(null);
                transaction.commit();
            }else if (intent.getStringExtra("intentCaller").equals("locationAlert")){
                fragment = new MenuNotifications();
                bundle = new Bundle();
                bundle.putString("tab", "2");
                fragment.setArguments(bundle);
                transaction.replace(R.id.container, fragment, "fragmentLocationAlert");
                transaction.addToBackStack(null);
                transaction.commit();
            }

        }
    }

具体来说，抛出错误的行是

if (intent.getStringExtra("intentCaller").equals("expensesRecurring"))

loadSelectedIntent将从MainActivity中的两个位置调用。第一个：

@Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        setIntent(intent);
        loadSelectedIntent(intent);
    }

第二个：

@Override
    protected void onResume() {
        super.onResume();
        Intent isThereAnyIntentHere = getIntent();
        if ((isThereAnyIntentHere != null) && (isThereAnyIntentHere.getExtras() != null)){
            loadSelectedIntent(isThereAnyIntentHere);
        }
    }

请注意，此错误仅在用户试图通过单击主屏幕上的应用程序图标来启动应用程序时才会出现。如果用户在Play Store中单击“打开应用程序”，则可以毫无问题地启动该应用程序

为什么此错误仅在选定设备上发生，并且仅在从主屏幕启动时发生

我想把代码

if ((intent != null) && (intent.getExtras() != null))

if ((intent != null) && (intent.getExtras() != null))