这些是我在手机上运行应用程序后得到的日志
02-24 23:40:03.153: E/AndroidRuntime(32501): FATAL EXCEPTION: main 02-24 23:40:03.153: E/AndroidRuntime(32501): Process: sunshine.com.example.himanshu.sunshine, PID: 32501 02-24 23:40:03.153: E/AndroidRuntime(32501): android.os.NetworkOnMainThreadException 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147) 02-24 23:40:03.153: E/AndroidRuntime(32501): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:110) 02-24 23:40:03.153: E/AndroidRuntime(32501): at libcore.io.IoBridge.connectErrno(IoBridge.java:137) 02-24 23:40:03.153: E/AndroidRuntime(32501): at libcore.io.IoBridge.connect(IoBridge.java:122) 02-24 23:40:03.153: E/AndroidRuntime(32501): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:183) 02-24 23:40:03.153: E/AndroidRuntime(32501): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:456) 02-24 23:40:03.153: E/AndroidRuntime(32501): at java.net.Socket.connect(Socket.java:882) 02-24 23:40:03.153: E/AndroidRuntime(32501): at com.android.okhttp.internal.Platform.connectSocket(Platform.java:139) 02-24 23:40:03.153: E/AndroidRuntime(32501): at com.android.okhttp.Connection.connect(Connection.java:148) 02-24 23:40:03.153: E/AndroidRuntime(32501): at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:276) 02-24 23:40:03.153: E/AndroidRuntime(32501): at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:211) 02-24 23:40:03.153: E/AndroidRuntime(32501): at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:373) 02-24 23:40:03.153: E/AndroidRuntime(32501): at com.android.okhttp.internal.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:106) 02-24 23:40:03.153: E/AndroidRuntime(32501): at sunshine.com.example.himanshu.sunshine.MainActivity$ForecastFragment$FetchWeatherTask.doInBackground(MainActivity.java:139) 02-24 23:40:03.153: E/AndroidRuntime(32501): at sunshine.com.example.himanshu.sunshine.MainActivity$ForecastFragment.onOptionsItemSelected(MainActivity.java:92) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.support.v4.app.Fragment.performOptionsItemSelected(Fragment.java:1894) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.support.v4.app.FragmentManagerImpl.dispatchOptionsItemSelected(FragmentManager.java:2034) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:356) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.support.v7.app.ActionBarActivity.onMenuItemSelected(ActionBarActivity.java:155) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.support.v7.app.ActionBarActivityDelegate$1.onMenuItemSelected(ActionBarActivityDelegate.java:74) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.support.v7.app.ActionBarActivityDelegateBase.onMenuItemSelected(ActionBarActivityDelegateBase.java:556) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.support.v7.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:802) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.support.v7.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:153) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:949) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.support.v7.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:939) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.support.v7.internal.view.menu.MenuPopupHelper.onItemClick(MenuPopupHelper.java:187) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.widget.AdapterView.performItemClick(AdapterView.java:300) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.widget.AbsListView.performItemClick(AbsListView.java:1143) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.widget.AbsListView$PerformClick.run(AbsListView.java:3044) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.widget.AbsListView$3.run(AbsListView.java:3833) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.os.Handler.handleCallback(Handler.java:739) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.os.Handler.dispatchMessage(Handler.java:95) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.os.Looper.loop(Looper.java:135) 02-24 23:40:03.153: E/AndroidRuntime(32501): at android.app.ActivityThread.main(ActivityThread.java:5312) 02-24 23:40:03.153: E/AndroidRuntime(32501): at java.lang.reflect.Method.invoke(Native Method) 02-24 23:40:03.153: E/AndroidRuntime(32501): at java.lang.reflect.Method.invoke(Method.java:372) 02-24 23:40:03.153: E/AndroidRuntime(32501): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901) 02-24 23:40:03.153: E/AndroidRuntime(32501): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
这是我的MainActivity.java文件：
package sunshine.com.example.himanshu.sunshine;
import android.os.AsyncTask;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.os.Build;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.io.BufferedReader;
import java.lang.reflect.Array;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.io.*;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new ForecastFragment())
.commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class ForecastFragment extends Fragment {
public ForecastFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.forecast_fragment,menu);
super.onCreateOptionsMenu(menu, inflater);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id=item.getItemId();
if(id==R.id.refresh_action)
{
FetchWeatherTask fetch=new FetchWeatherTask();
fetch.doInBackground();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
String forecastArray[] = {"Today-sunny-23/34",
"Tomorrow-foggy-45/67",
"Wed-asteroid-54/34",
"Thursday--sunny-34/56",
"Fri-foggy-45/34"
, "Sat-day-23/45"
, "Sun-Sunny-34/65", "Someday-gloomy-78/90", "Sat-day-23/45",
"Wed-asteroid-54/34", "Today-sunny-23/34"};
List weekForecast = new ArrayList(Arrays.asList(forecastArray));
ArrayAdapter mForecastAdapter = new ArrayAdapter(getActivity(), R.layout.list_item_forecast, R.id.list_item_forecast_textview, weekForecast);
ListView listView = (ListView) rootView.findViewById(R.id.listview_forecast);
listView.setAdapter(mForecastAdapter);
return rootView;
}
public class FetchWeatherTask extends AsyncTask {
@Override
protected Void doInBackground(Void... urls) {
// These two need to be declared outside the try/catch
// so that they can be closed in the finally block.
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
// Will contain the raw JSON response as a string.
String forecastJsonStr = null;
try {
// Construct the URL for the OpenWeatherMap query
// Possible parameters are available at OWM's forecast API page, at
// http://openweathermap.org/API#forecast
URL url = new URL("http://api.openweathermap.org/data/2.5/forecast/daily?q=94043&mode=json&units=metric&cnt=7");
// Create the request to OpenWeatherMap, and open the connection
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.connect();
// Read the input stream into a String
InputStream inputStream = urlConnection.getInputStream();
StringBuffer buffer = new StringBuffer();
if (inputStream == null) {
// Nothing to do.
forecastJsonStr = null;
}
reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
// Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
// But it does make debugging a *lot* easier if you print out the completed
// buffer for debugging.
buffer.append(line + "\n");
}
if (buffer.length() == 0) {
// Stream was empty. No point in parsing.
forecastJsonStr = null;
}
forecastJsonStr = buffer.toString();
} catch (IOException e) {
Log.e("PlaceholderFragment", "Error ", e);
// If the code didn't successfully get the weather data, there's no point in attempting
// to parse it.
forecastJsonStr = null;
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (reader != null) {
try {
reader.close();
} catch (final IOException e) {
Log.e("PlaceholderFragment", "Error closing stream", e);
}
}
}
return null;
}
}
}
}
这是我的Android Manifest文件：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="sunshine.com.example.himanshu.sunshine" >
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
每当我在手机上运行时，应用都会崩溃。请帮助我，谢谢你找到解决方案 我创建了一个连接到INTERNET的AsyncTask，而不是使用主线程连接到Internet