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[英]Why do I get a Runtime exception when I try to find values I just put in the hashmap?
[英]Why I get an exception when I try to start a new Intent?
我是Android的新手,卻遇到如下異常:
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.simplepay.hellomobile/com.simplepay.hellomobile.CardPayment}: android.os.NetworkOnMainThreadException
stacktrace在這里:
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
at android.app.ActivityThread.access$600(ActivityThread.java:141)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5039)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.os.NetworkOnMainThreadException
at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
at libcore.io.BlockGuardOs.recvfrom(BlockGuardOs.java:163)
at libcore.io.IoBridge.recvfrom(IoBridge.java:513)
at java.net.PlainSocketImpl.read(PlainSocketImpl.java:488)
at java.net.PlainSocketImpl.access$000(PlainSocketImpl.java:46)
at java.net.PlainSocketImpl$PlainSocketInputStream.read(PlainSocketImpl.java:240)
at org.apache.http.impl.io.AbstractSessionInputBuffer.fillBuffer(AbstractSessionInputBuffer.java:103)
at org.apache.http.impl.io.SocketInputBuffer.isStale(SocketInputBuffer.java:109)
at org.apache.http.impl.AbstractHttpClientConnection.isStale(AbstractHttpClientConnection.java:205)
at org.apache.http.impl.conn.AbstractClientConnAdapter.isStale(AbstractClientConnAdapter.java:185)
at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:336)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:653)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627)
at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616)
at juspay.services.WalletService.makeServiceCall(WalletService.java:283)
at juspay.services.WalletService.getCardTokens(WalletService.java:237)
at com.simplepay.hellomobile.CardPayment.addContentTo(CardPayment.java:107)
at com.simplepay.hellomobile.CardPayment.setUpLayoutAndActionListeners(CardPayment.java:81)
at com.simplepay.hellomobile.CardPayment.onCreate(CardPayment.java:56)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
請注意,所有網絡調用都是使用AsyncTask
完成的,並放置在doInBackground
方法內。 代碼是:
protected JSONObject doInBackground(Void... voids)
{
JSONObject initOrderResponse = walletService.initOrder(this.amount);
return initOrderResponse;
}
其中, initOrder
是一個普通的java方法,它的行類似於:
responseBody = httpClient.execute(post,responseHandler);
但是我仍然得到這個錯誤。
不知道我在哪里犯錯。
提前致謝。
造成原因:android.os.NetworkOnMainThreadException
您正在嘗試在UI線程上進行網絡調用。
因此,使用AsyncTask完成這些任務。
在Android 3.0及更高版本中,它強制要求任何可能會阻止UI的網絡調用或操作都必須在后台線程上完成。
編輯:
在onCreate()
嘗試一下
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
我見過有人像這樣執行AsyncTask
。 new MyAsyncTask().doInBackground();
而不是new MyAsyncTask().execute();
。 請確保您不會無意間犯此錯誤。
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