Android：应用程序在初始化新的AsyncTask时崩溃（VerifyError）

Question

我有一个应用程序崩溃的点：“New Downloader（this,mURL）；”：

    Downloader downloader = new Downloader(this, mURL);
    downloader.execute(0);

public class Downloader extends AsyncTask<Integer,Integer,String>{

private Fragment fragment;
private String mURL;
private Activity activity;

public Downloader(VertretungsplanFragment fr, String mURL)
{
    fragment = fr;
    this.mURL = mURL;
    this.activity = fr.getActivity();
}
@Override
protected String doInBackground(Integer... integers) {
[...]}
}

02-25 15:40:55.405 619-619/them.vertretungsplan e/androidruntime：致命异常：main java.lang.verifyerror：thems.vertretungsplan.downloader at thems.vertretungsplan.vertretungsplan.vertretungsplanfragment.startdownload（vertretungsplan.java:253)at thems.vertretungsplan.vertretungsplanfragment.oncreateview（entManager.java:927)在Android.support.v4.app.fragmentManagerimpl.moveToState（fragmentManager.java:1104)在Android.support.v4.app.backStackRecord.run（backStackRecord.java:682)在Android.support.v4.app.fragmentManagerimpl.execPendingActions（fragmentManager.java:1467)在Android.support.v4.app.fragmentManagerimpl.executePendingTransactions（4.view.viewpager.populate(Viewpager.java:1068)在Android.support.v4.view.viewPager.populate（viewPager.java:914)在Android.support.v4.view.viewPager.onMeasure（viewPager.java:1436)在Android.view.view.view.measure（view.java:8313)在Android.view.view.view.measure（view.java:8313)在Android.view.view.view.view.measure（view.java:838)在.view.measure（view.java:8313)在Android.view.viewgroup.MeasureChildWithMargins（viewgroup.java:3138)在Android.widget.framelayout.onMeasure（framelayout.java:250)在Android.view.widget.relationvelayout.measure（view.java:581)在Android.widget.relivelayout.measure（view.java:581)在.OnMeasure（FrameLayout.java:250)在Android.view.view.measure（view.java:8313)在Android.view.viewgroup.measure ChildWith Margins（viewgroup.java:250)在Android.widget.framelayout.onMeasure（framelayout.java:250)在Android.view.view.viewlayout.measure（view.java:8313)在Android.support.v4.widget.drawerlayout.onMeasure（java:250)在Android.view.view.measure（view.java:8313)在Android.widget.linearlayout.measurevertical（linearlayout.java:531)在Android.widget.linearlayout.onmeasure（linearlayout.java:309)在Android.view.viewgroup.measure（view.java:8313)在Android.view.viewgroup.measure（view.java:8313)在id.widget.frameLayout.onmeasu在Android.view.view.measure（view.java:8313)在Android.view.viewroot.performTraversals（viewroot.java:839)在Android.view.viewroot.handleMessage（viewroot.java:1859)在Android.os.handler.dispatchMessage（handler.java:99)在Android.app.activitythread.main（activitythread.java:3683)，在Android.app.activitythread.java（com.android.internal.os.zygoteinit$methodandargscaller.run(zygoteinit.java:839)在com.android.internal.os.zygoteinit.main（zygoteinit.java:597)在dalvik.system.nativestart.main（本机方法）

Answer 1

您必须从实例化片段的活动中获得上下文。

context =new Context();
context = getActivity();

将此“上下文”作为上下文传递给asynctask构造函数。