我在那裏我試圖加載AsyncTaskLoader
產生的原因:顯示java.lang.NullPointerException:嘗試調用接口方法「android.support.v4.content.Loader
,而是一種活動,我得到一個NullPointerException在線
getSupportLoaderManager().initLoader(0,null,null).forceLoad();
它工作正常,但突然間我開始看到這個崩潰。
我花了數小時試圖找出它爲什麼發生,但找不到任何東西。
我的活動有以下進口:
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.AsyncTaskLoader;
import android.support.v4.content.Loader;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
,並延伸AppCompatActivity
這裏是我的堆棧跟蹤以供參考:
Caused by: java.lang.NullPointerException: Attempt to invoke interface method 'android.support.v4.content.Loader android.support.v4.app.LoaderManager$LoaderCallbacks.onCreateLoader(int, android.os.Bundle)' on a null object reference
at android.support.v4.app.LoaderManagerImpl.createLoader(LoaderManager.java:539)
at android.support.v4.app.LoaderManagerImpl.createAndInstallLoader(LoaderManager.java:548)
at android.support.v4.app.LoaderManagerImpl.initLoader(LoaderManager.java:603)
at in.com.example.app.Activity.ExperiencesNTravel.CategoryVideoListActivity.onCreate(CategoryVideoListActivity.java:106)
at android.app.Activity.performCreate(Activity.java:6251)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
的[?什麼是空指針異常,以及如何解決呢(可能的複製http://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-如何做 - 我 - 修復它) – X3Btel