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Failed to start Activity ComponentInfo

I am trying to make my main activity open another activity (ListAtivity). However, when I click on the button, the application crashes and the following exception:

01-26 17:12:58.341: E/AndroidRuntime(790): FATAL EXCEPTION: main 01-26 17:12:58.341: E/AndroidRuntime(790): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.slideoutmenu/com.example.slideoutmenu.ListViewActivity}: android.os.NetworkOnMainThreadException 01-26 17:12:58.341: E/AndroidRuntime(790): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) 01-26 17:12:58.341: E/AndroidRuntime(790): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 01-26 17:12:58.341: E/AndroidRuntime(790): at android.app.ActivityThread.access$600(ActivityThread.java:141) 01-26 17:12:58.341: E/AndroidRuntime(790): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 01-26 17:12:58.341: E/AndroidRuntime(790): at android.os.Handler.dispatchMessage(Handler.java:99) 01-26 17:12:58.341: E/AndroidRuntime(790): at android.os.Looper.loop(Looper.java:137) 01-26 17:12:58.341: E/AndroidRuntime(790): at android.app.ActivityThread.main(ActivityThread.java:5039) 01-26 17:12:58.341: E/AndroidRuntime(790): at java.lang.reflect.Method.invokeNative(Native Method) 01-26 17:12:58.341: E/AndroidRuntime(790): at java.lang.reflect.Method.invoke(Method.java:511) 01-26 17:12:58.341: E/AndroidRuntime(790): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 01-26 17:12:58.341: E/AndroidRuntime(790): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 01-26 17:12:58.341: E/AndroidRuntime(790): at dalvik.system.NativeStart.main(Native Method) 01-26 17:12:58.341: E/AndroidRuntime(790): Caused by: android.os.NetworkOnMainThreadException 01-26 17:12:58.341: E/AndroidRuntime(790): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117) 01-26 17:12:58.341: E/AndroidRuntime(790): at java.net.InetAddress.lookupHostByName(InetAddress.java:385) 01-26 17:12:58.341: E/AndroidRuntime(790): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236) 01-26 17:12:58.341: E/AndroidRuntime(790): at java.net.InetAddress.getAllByName(InetAddress.java:214) 01-26 17:12:58.341: E/AndroidRuntime(790): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137) 01-26 17:12:58.341: E/AndroidRuntime(790): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164) 01-26 17:12:58.341: E/AndroidRuntime(790): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119) 01-26 17:12:58.341: E/AndroidRuntime(790): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360) 01-26 17:12:58.341: E/AndroidRuntime(790): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555) 01-26 17:12:58.341: E/AndroidRuntime(790): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487) 01-26 17:12:58.341: E/AndroidRuntime(790): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465) 01-26 17:12:58.341: E/AndroidRuntime(790): at com.example.slideoutmenu.JSONParser.getJSONFromUrl(JSONParser.java:34) 01-26 17:12:58.341: E/AndroidRuntime(790): at com.example.slideoutmenu.ListViewActivity.onCreate(ListViewActivity.java:57) 01-26 17:12:58.341: E/AndroidRuntime(790): at android.app.Activity.performCreate(Activity.java:5104) 01-26 17:12:58.341: E/AndroidRuntime(790): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) 01-26 17:12:58.341: E/AndroidRuntime(790): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)

Here are the main activities:

 import android.os.Bundle; import android.app.Activity; import android.content.Intent; import android.util.DisplayMetrics; import android.view.View; import android.view.View.OnClickListener; import android.view.animation.Animation; import android.view.animation.TranslateAnimation; import android.webkit.WebView; import android.webkit.WebViewClient; import android.widget.Button; import android.widget.FrameLayout; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.RelativeLayout; import android.widget.TextView; public class LayerStack extends Activity { //Declare private LinearLayout slidingPanel; private boolean isExpanded; private DisplayMetrics metrics; private WebView webView; private RelativeLayout headerPanel; private RelativeLayout menuPanel; private int panelWidth; private ImageView menuViewButton; private Button button; private TextView menubutton1; FrameLayout.LayoutParams menuPanelParameters; FrameLayout.LayoutParams slidingPanelParameters; LinearLayout.LayoutParams headerPanelParameters ; LinearLayout.LayoutParams listViewParameters; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_layer_stack); //Initialize metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics); panelWidth = (int) ((metrics.widthPixels)*0.75); headerPanel = (RelativeLayout) findViewById(R.id.header); headerPanelParameters = (LinearLayout.LayoutParams) headerPanel.getLayoutParams(); headerPanelParameters.width = metrics.widthPixels; headerPanel.setLayoutParams(headerPanelParameters); menuPanel = (RelativeLayout) findViewById(R.id.menuPanel); menuPanelParameters = (FrameLayout.LayoutParams) menuPanel.getLayoutParams(); menuPanelParameters.width = panelWidth; menuPanel.setLayoutParams(menuPanelParameters); slidingPanel = (LinearLayout) findViewById(R.id.slidingPanel); slidingPanelParameters = (FrameLayout.LayoutParams) slidingPanel.getLayoutParams(); slidingPanelParameters.width = metrics.widthPixels; slidingPanel.setLayoutParams(slidingPanelParameters); menubutton1 = (TextView) findViewById(R.id.menu_item_1); menubutton1.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Intent i = new Intent(getApplicationContext(), ListViewActivity.class); startActivity(i); } }); webView = (WebView) findViewById(R.id.webView1); webView.setWebViewClient(new WebViewClient() { @Override public boolean shouldOverrideUrlLoading(WebView view, String url){ view.loadUrl(url); return true; } }); webView.loadUrl("http://www.google.com.br"); button = (Button) findViewById(R.id.button1); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub Intent i = new Intent(getApplicationContext(), ListViewActivity.class); startActivity(i); } }); //Slide the Panel menuViewButton = (ImageView) findViewById(R.id.menuViewButton); menuViewButton.setOnClickListener(new OnClickListener() { public void onClick(View v) { if(!isExpanded){ isExpanded = true; //Expand new ExpandAnimation(slidingPanel, panelWidth, Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF, 0.75f, 0, 0.0f, 0, 0.0f); }else{ isExpanded = false; //Collapse new CollapseAnimation(slidingPanel,panelWidth, TranslateAnimation.RELATIVE_TO_SELF, 0.75f, TranslateAnimation.RELATIVE_TO_SELF, 0.0f, 0, 0.0f, 0, 0.0f); } } }); } }

And here is the list I want to open

 package com.example.slideoutmenu; import java.util.ArrayList; import java.util.HashMap; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import android.app.ListActivity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ListAdapter; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.TextView; public class ListViewActivity extends ListActivity { // url to make request private static String url = "http://api.androidhive.info/contacts/"; // JSON Node names private static final String TAG_CONTACTS = "contacts"; private static final String TAG_ID = "id"; private static final String TAG_NAME = "name"; private static final String TAG_EMAIL = "email"; private static final String TAG_ADDRESS = "address"; private static final String TAG_GENDER = "gender"; private static final String TAG_PHONE = "phone"; private static final String TAG_PHONE_MOBILE = "mobile"; private static final String TAG_PHONE_HOME = "home"; private static final String TAG_PHONE_OFFICE = "office"; JSONArray contacts = null; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_layer_2); ArrayList<HashMap<String, String>> contactList = new ArrayList<HashMap<String, String>>(); JSONParser jParser = new JSONParser(); JSONObject json = jParser.getJSONFromUrl(url); try { contacts = json.getJSONArray(TAG_CONTACTS); for(int i = 0; i < contacts.length(); i++){ JSONObject c = contacts.getJSONObject(i); String id = c.getString(TAG_ID); String name = c.getString(TAG_NAME); String email = c.getString(TAG_EMAIL); String address = c.getString(TAG_ADDRESS); String gender = c.getString(TAG_GENDER); JSONObject phone = c.getJSONObject(TAG_PHONE); String mobile = phone.getString(TAG_PHONE_MOBILE); String home = phone.getString(TAG_PHONE_HOME); String office = phone.getString(TAG_PHONE_OFFICE); HashMap<String, String> map = new HashMap<String, String>(); map.put(TAG_ID, id); map.put(TAG_NAME, name); map.put(TAG_EMAIL, email); map.put(TAG_PHONE_MOBILE, mobile); contactList.add(map); } } catch (JSONException e) { e.printStackTrace(); } ListAdapter adapter = new SimpleAdapter(this, contactList, R.layout.list_item, new String[] { TAG_NAME, TAG_EMAIL, TAG_PHONE_MOBILE }, new int[] { R.id.name, R.id.email, R.id.mobile }); setListAdapter(adapter); ListView lv = getListView(); lv.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { String name = ((TextView) view.findViewById(R.id.name)).getText().toString(); String cost = ((TextView) view.findViewById(R.id.email)).getText().toString(); String description = ((TextView) view.findViewById(R.id.mobile)).getText().toString(); Intent in = new Intent(getApplicationContext(), SingleMenuItemActivity.class); in.putExtra(TAG_NAME, name); in.putExtra(TAG_EMAIL, cost); in.putExtra(TAG_PHONE_MOBILE, description); startActivity(in); } }); } }
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1 answer
 Caused by: android.os.NetworkOnMainThreadException

You cannot perform network operations in the main thread in the latest APIs (see NetworkOnMainThreadException ). You need to move the code that retrieves your JSON objects to another Thread , possibly using AsyncTask .

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