关于Causedby:android.os.NetworkOnMainThreadException错误解决办法和androidsoftwarecausedconnectionabort的问题就给大家
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本文目录一览:- Caused by: android.os.NetworkOnMainThreadException错误解决办法(android software caused connection abort)
- Android HttpClient:NetworkOnMainThreadException
- android – RxJava 2 / Retrofit 2 – NetworkOnMainThreadException
- android – RxJava和Retrofit2:NetworkOnMainThreadException
- android – Service中的NetworkOnMainThreadException
Caused by: android.os.NetworkOnMainThreadException错误解决办法(android software caused connection abort)
好久不写Android代码手都生了,找出自己之前写的程序发现跑不了了,也没啥特别的错误提示,就看到一句有用的错误Caused by: android.os.networkonmainthreadException,查了下原因上在4.0之后在主线程里面执行Http请求都会报这个错,大概是怕Http请求时间太长造成程序假死的情况吧。
解决办法有两个思路,分别是:
第一种方法:直接忽视,强制使用(强烈不推荐,但是修改简单)
在MainActivity文件的setContentView(R.layout.activity_main)下面加上如下代码
if (android.os.Build.VERSION.SDK_INT > 9) { StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build(); StrictMode.setThreadPolicy(policy); }
第二种方法:使用Thread、Runnable、Handler (推荐使用)
在Runnable中做HTTP请求,不用阻塞UI线程~
public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setContentView(R.layout.share_mblog_view); new Thread(runnable).start(); } Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); Bundle data = msg.getData(); String val = data.getString("value"); Log.i("mylog","请求结果-->" + val); } } Runnable runnable = new Runnable(){ @Override public void run() { // // Todo: http request. // Message msg = new Message(); Bundle data = new Bundle(); data.putString("value","请求结果"); msg.setData(data); handler.sendMessage(msg); } }
附:另一篇解决方案
Android 4.1项目:使用新浪微博分享时报:
android.os.networkonmainthreadException
网上搜索后知道是因为版本问题,在4.0之后在主线程里面执行Http请求都会报这个错,也许是怕Http请求时间太长造成程序假死的情况吧。那么网上的朋友也给出了相应的解决方案,这叫上有政策下有对策:
一:在发起Http请求的Activity里面的onCreate函数里面添加如下代码:
//详见StrictMode文档 StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().detectdiskReads(). detectdiskWrites().detectNetwork().penaltyLog().build()); StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectLeakedsqlLiteObjects(). detectLeakedClosableObjects().penaltyLog().penaltyDeath().build());
如果正在做的项目不是Android 4.0的是看不到StrictMode类的。我也是用的网上给的com_weibo_android.jar。但是这个jar包下载下来的时候是2.3的,要先转换成Android 4.0的项目,再在分享对应的ShareActivity的onCreate()函数中添加上面的两行代码。这样就不会报这个错误了。
二:使用Thread、Runnable、Handler这三个类:
public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setContentView(R.layout.share_mblog_view); new Thread(runnable).start(); } Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); Bundle data = msg.getData(); String val = data.getString("value"); Log.i("mylog","请求结果为-->" val); } } Runnable runnable = new Runnable(){ @Override public void run() { // // Todo: http request. // Message msg = new Message(); Bundle data = new Bundle(); data.putString("value","请求结果"); msg.setData(data); handler.sendMessage(msg); } }
Android HttpClient:NetworkOnMainThreadException
我在下面有一些代码:
protected void testConnection(String url) {
DefaultHttpClient httpclient = new DefaultHttpClient();
HttpGet httpget = new HttpGet(url);
ResponseHandler<String> responsehandler = new BasicResponseHandler();
try {
String connection = httpclient.execute(httpget, responsehandler);
Toast.makeText(getBaseContext(), R.string.connection_succeed, Toast.LENGTH_SHORT).show();
view_result.setText(connection);
} catch(IOException e) {
Toast.makeText(getBaseContext(), R.string.connection_Failed, Toast.LENGTH_SHORT).show();
}
httpclient.getConnectionManager().shutdown();
}
并在Menifest中添加权限:
<uses-permission android:name="android.permission.INTERNET"/>
但它是一个例外:
networkonmainthreadException,
我能怎么做?
解决方法:
在ICS及更高版本上,您无法再在UI线程上执行网络操作.相反,你被迫创建一个新的线程并在那里做你的网络.
可能的工具是Android的AsyncTask和普通的Java Thread.
可以在这里找到一个很好的教程:Android Threads, Handlers and AsyncTask – Tutorial
android – RxJava 2 / Retrofit 2 – NetworkOnMainThreadException
这就是我试图这样做的方式,此刻我可以刷新令牌,但它会抛出一个networkonmainthreadException.它完成了请求,更新令牌并到达日志,但是这个例外它杀了我.我怎么能避免这种情况?
public Observable<Estabelecimento> listarEstabelecimentos() { return Observable.defer(this::getListarEstabelecimentoObservable) .retrywhen(throwableObservable -> throwableObservable.flatMap( throwable -> { if (throwable instanceof UnauthorizedException) { return mRequestManager.getTokenObservable(AutoAtendimentoApplication.getContext()) .doOnNext(response -> /* log stuff */) .flatMap((Function<AuthResponse,ObservableSource<?>>) response2 -> getListarEstabelecimentoObservable() .doOnNext(estabelecimento -> /* log stuff */) ) ); } return Observable.error(throwable); })); }
NetWorkErrorHandler:
public <T> T processError(Response<T> response ) { switch (response.code()) { case 401: throw new UnauthorizedException(); default: return response.body(); } }
令牌:
private Observable<AuthResponse> getToken(Context context,@GrantType.GrantTypeDef String grantType,@Nullable String refreshToken) { SessionManager sessionManager = SessionManager.getInstance(context); Usuario usuario = sessionManager.getUser(); AuthRequest request = new AuthRequest(usuario.getUsername(),usuario.getpassword(),grantType,refreshToken); return mAuthAPIService.getToken(request) .observeOn(AndroidSchedulers.mainThread()) .subscribeOn(Schedulers.io()) .map(response -> storetokens(response,context)); }
编辑1:我很确定问题发生在flatmap中并且put subscriOn没有解决问题
编辑2:代码更新
解决方法
observeOn(…)表示结果在指定的线程上发出 – 在这种情况下是UI线程.
subscribeOn(…)调用基本上是处理请求的地方.如果省略,则在当前线程上完成计算.
android – RxJava和Retrofit2:NetworkOnMainThreadException
我意识到我在MainThread上使用了subscribeOn()/ observeOn().
我可以传递给subscribeOn()的选项有哪些?
我可以传递给observeOn()的选项有哪些?
12-17 21:36:09.154 20550-20550/rx.test D/MainActivity2: [onCreate]
12-17 21:36:09.231 20550-20550/rx.test D/MainActivity2: starting up observable...
12-17 21:36:09.256 20550-20550/rx.test D/MainActivity2: [onError]
12-17 21:36:09.256 20550-20550/rx.test W/System.err: android.os.networkonmainthreadException
GovService.java
import java.util.List;
import retrofit.Call;
import retrofit.http.GET;
import rx.Observable;
public interface GovService {
@GET("/txt2lrn/sat/index_1.json")
Observable<MyTest> getoneTestRx();
}
MyTest.java
public class MyTest {
private String name, url;
private int num;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public int getNum() {
return num;
}
public void setNum(int num) {
this.num = num;
}
@Override
public String toString() {
return "Name: " + this.name + ", num: " + this.num + ", url: " + this.url;
}
}
MainActivity2.java
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.linearlayoutmanager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import retrofit.GsonConverterFactory;
import retrofit.Retrofit;
import retrofit.RxJavaCallAdapterFactory;
import rx.Observable;
import rx.Subscriber;
import rx.android.schedulers.AndroidSchedulers;
import rx.schedulers.Schedulers;
public class MainActivity2 extends AppCompatActivity {
private final String TAG = getClass().getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d(TAG, "[onCreate]");
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
RecyclerView mRV = (RecyclerView) findViewById(R.id.rv);
mRV.setLayoutManager(new linearlayoutmanager(this));// setup LayoutManager
mRV.setItemAnimator(new DefaultItemAnimator());// setup ItemAnimator
// setup retrofit
Retrofit retrofit = new Retrofit.Builder()
.baseUrl("http://goanuj.freeshell.org")
.addConverterFactory(GsonConverterFactory.create())
.addCallAdapterFactory(RxJavaCallAdapterFactory.create())
.build();
GovService service = retrofit.create(GovService.class);
Log.d(TAG, "starting up observable...");
Observable<MyTest> o = service.getoneTestRx();
o.subscribeOn(Schedulers.io());
o.observeOn(AndroidSchedulers.mainThread());
o.subscribe(new Subscriber<MyTest>() {
@Override
public void onCompleted() {
Log.d(TAG, "[onCompleted] ");
}
@Override
public void one rror(Throwable t) {
Log.d(TAG, "[onError] ");
t.printstacktrace();
}
@Override
public void onNext(MyTest m) {
Log.d(TAG, "[onNext] " + m.toString());
}
});
}
}
解决方法:
将代码的最后一部分重写为:
service.getoneTestRx()
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe(new Subscriber<MyTest>() {
@Override
public void onCompleted() {
Log.d(TAG, "[onCompleted] ");
}
@Override
public void one rror(Throwable t) {
Log.d(TAG, "[onError] ");
t.printstacktrace();
}
@Override
public void onNext(MyTest m) {
Log.d(TAG, "[onNext] " + m.toString());
}
});
来自@akarnokd的重要提示:
Worth mentioning that one needs to chain the calls as here because
Observable is not the builder pattern (where you modify the settings
of an existing object)
android – Service中的NetworkOnMainThreadException
在Service方法中,我正在调用静态帮助器方法来下载数据.我也在使用DefaultHttpClient.
这里发生了什么?
解决方法
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