早上好!
我在google play商店中有一个Android应用程序,其中有一个从服务器加载一些数据的小部件。 在我的Play-Console中,我得到以下异常:
java.lang.RuntimeException:
at android.os.AsyncTask$3.done (AsyncTask.java:318)
at java.util.concurrent.FutureTask.finishCompletion (FutureTask.java:354)
at java.util.concurrent.FutureTask.setException (FutureTask.java:223)
at java.util.concurrent.FutureTask.run (FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run (AsyncTask.java:243)
at java.util.concurrent.ThreadPoolExecutor.runWorker (ThreadPoolExecutor.java:1133)
at java.util.concurrent.ThreadPoolExecutor$Worker.run (ThreadPoolExecutor.java:607)
at java.lang.Thread.run (Thread.java:762)
Caused by: java.lang.RuntimeException:
at android.os.Handler.<init> (Handler.java:200)
at android.os.Handler.<init> (Handler.java:114)
at package.Widget.fehler (Widget.java:279)
at package.Widget_Server.doInBackground (Widget_Server.java:73)
at package.Widget_Server.doInBackground (Widget_Server.java:19)
at android.os.AsyncTask$2.call (AsyncTask.java:304)
at java.util.concurrent.FutureTask.run (FutureTask.java:237)
java类“Widget_Server.java”启动连接并从服务器获取数据。 “Widget.java”是Widget的Main_class。
Widget_Server.java,第73行:
finally {
try {
reader.close();
} catch(Exception ex) {
EXCEPTION (line 73) -> widget.fehler("Fehler! #2215", context);
}
}
Widget.java,第279行:(在方法fehler(String, Context)
内)
remoteViews.setTextViewText(R.id.label4, fehlerbeschreibung);
EXCEPTION (line 279) -> Handler handler = new Handler();
handler.postDelayed(new Runnable() {
public void run() {
remoteViews.setViewVisibility(R.id.loading, View. INVISIBLE);
update(context);
}
}, 1000);
Handler初始化如何抛出runtime_exception?
我搜索了很长时间,但我没有找到相关的信息。
感谢所有答案!
答案 0 :(得分:1)
Handler handler = new Handler()
实际上会在下面的构造函数中调用。
public Handler(Callback callback, boolean async) {
mLooper = Looper.myLooper();
if (mLooper == null) {
throw new RuntimeException(
"Can't create handler inside thread that has not called Looper.prepare()");
}
mQueue = mLooper.mQueue;
mCallback = callback;
mAsynchronous = async;
}
如您所见,如果未调用Looper.prepare()
,则会发送RuntimeException
。