Develop Reference

ClassNotFoundException in dalvik.system.PathClassLoader

i am running one android application in which i am using ActionBar but from supported library for android 2.2
i have added two external jar file as a support libraries
android-support-v7-appcompact.jar
android-support-v13.jar
but when i run the sample in my device i getting following runtime error
java.lang.RuntimeException: Unable to instantiate activity
ComponentInfo{com.example.android.navigationdrawerexample/com.example.android.navigationdrawerexample.NavMainActivity}:
java.lang.ClassNotFoundException:
com.example.android.navigationdrawerexample.NavMainActivity in loader
dalvik.system.PathClassLoader[/data/app/com.example.android.navigationdrawerexample-1.apk]
at
android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2703)
at
android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2797)
at android.app.ActivityThread.access$2300(ActivityThread.java:135)
at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:2132)
at android.os.Handler.dispatchMessage(Handler.java:99) at
android.os.Looper.loop(Looper.java:143) at
android.app.ActivityThread.main(ActivityThread.java:4914) at
java.lang.reflect.Method.invokeNative(Native Method) at
java.lang.reflect.Method.invoke(Method.java:521) at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) at
dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.ClassNotFoundException: com.example.android.navigationdrawerexample.NavMainActivity in loader dalvik.system.PathClassLoader[/data/app/com.example.android.navigationdrawerexample-1.apk]
at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:243)
at java.lang.ClassLoader.loadClass(ClassLoader.java:573)
at java.lang.ClassLoader.loadClass(ClassLoader.java:532)
at android.app.Instrumentation.newActivity(Instrumentation.java:1033)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2695)
here is the menifest file content
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.android.navigationdrawerexample"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="7" />
<application
android:label="#string/app_name"
android:icon="#drawable/ic_launcher"
>
<activity android:name="NavMainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>
order of jar files

You should not only look at errors but also at warnings (orange text color in eclipse logcat view). Dalvik class loading are often preceded by some interesting informations about why a class can't be loaded by the Dalvik, something like a super class not existing.

Android ClassNotFound Exception

These are my two classes and my manifest. I got a ClassNotFoundException. I have also included my log cat.
My first class:
package com.m.mech;
import com.parse.Parse;
import com.parse.ParseACL;
import com.parse.ParseUser;
import android.app.Application;
public class ParsePro extends Application {
#Override
public void onCreate() {
super.onCreate();
// Add your initialization code here
Parse.initialize(this,"tadjgdfghdfgdfdfcfgdfcr", "QlwkikEQCXZ8cW9ghjwbFpXjAaWEr5Js6H2Cud5");
PushService.setDefaultPushCallback(this, MainActivity.class);
ParseInstallation.getCurrentInstallation().saveInBackground();
ParseUser.enableAutomaticUser();
ParseACL defaultACL = new ParseACL();
// If you would like all objects to be private by default, remove this line.
defaultACL.setPublicReadAccess(true);
ParseACL.setDefaultACL(defaultACL, true);
}
}
My second class:
package com.m.mech;
import com.m.mech.R;
import android.app.Activity;
import android.os.Bundle;
import com.parse.ParseAnalytics;
public class MainActivity extends Activity {
/** Called when the activity is first created. */
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ParseAnalytics.trackAppOpened(getIntent());
}
}
My manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.m.mech"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="4"
android:targetSdkVersion="15" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.VIBRATE" />
<application
android:name="com.m.mech.ParsePro"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:name="com.parse.mech.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>
<service android:name="com.parse.PushService" />
<receiver android:name="com.parse.ParseBroadcastReceiver" >
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
<action android:name="android.intent.action.USER_PRESENT" />
</intent-filter>
</receiver>
</application>
</manifest>
My LogCat:
10-15 14:59:36.168: E/AndroidRuntime(1114): FATAL EXCEPTION: main
10-15 14:59:36.168: E/AndroidRuntime(1114): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.m.mech/com.parse.mech.MainActivity}: java.lang.ClassNotFoundException: Didn't find class "com.parse.mech.MainActivity" on path: /data/app/com.m.mech-2.apk
10-15 14:59:36.168: E/AndroidRuntime(1114): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106)
10-15 14:59:36.168: E/AndroidRuntime(1114): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
10-15 14:59:36.168: E/AndroidRuntime(1114): at android.app.ActivityThread.access$600(ActivityThread.java:141)
10-15 14:59:36.168: E/AndroidRuntime(1114): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
10-15 14:59:36.168: E/AndroidRuntime(1114): at android.os.Handler.dispatchMessage(Handler.java:99)
10-15 14:59:36.168: E/AndroidRuntime(1114): at android.os.Looper.loop(Looper.java:137)
10-15 14:59:36.168: E/AndroidRuntime(1114): at android.app.ActivityThread.main(ActivityThread.java:5039)
10-15 14:59:36.168: E/AndroidRuntime(1114): at java.lang.reflect.Method.invokeNative(Native Method)
10-15 14:59:36.168: E/AndroidRuntime(1114): at java.lang.reflect.Method.invoke(Method.java:511)
10-15 14:59:36.168: E/AndroidRuntime(1114): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-15 14:59:36.168: E/AndroidRuntime(1114): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-15 14:59:36.168: E/AndroidRuntime(1114): at dalvik.system.NativeStart.main(Native Method)
10-15 14:59:36.168: E/AndroidRuntime(1114): Caused by: java.lang.ClassNotFoundException: Didn't find class "com.parse.mech.MainActivity" on path: /data/app/com.m.mech-2.apk
10-15 14:59:36.168: E/AndroidRuntime(1114): at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:65)
10-15 14:59:36.168: E/AndroidRuntime(1114): at java.lang.ClassLoader.loadClass(ClassLoader.java:501)
10-15 14:59:36.168: E/AndroidRuntime(1114): at java.lang.ClassLoader.loadClass(ClassLoader.java:461)
10-15 14:59:36.168: E/AndroidRuntime(1114): at android.app.Instrumentation.newActivity(Instrumentation.java:1054)
10-15 14:59:36.168: E/AndroidRuntime(1114): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097)
10-15 14:59:36.168: E/AndroidRuntime(1114): ... 11 more
10-15 14:59:47.998: E/Trace(1137): error opening trace file: No such file or directory (2)
Why am I getting this ClassNotFoundException?

This line in your manifest does not match your package/classname of your main activity:
android:name="com.parse.mech.MainActivity"
Change it to
android:name="com.m.mech.MainActivity"

use right package name for registering service and Activities in AndroidManifest.xml because package name is com.m.mech but you are currently using com.parse for registering.
....
<activity
android:name="com.m.mech.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>
<service android:name="com.m.mech.PushService" />
<receiver android:name="com.m.mech.ParseBroadcastReceiver" >
....

your main activity is in package com.m.mech but in your manifest file you put com.parse.mech.MainActivity as start point

whow..
if your packagename is correct, just clean the project and export it again..
It's worked for me !

For Android Studio
Even if after changing the package name in the manifest file is not working for you, just try to invalidate cache and reload the project. It worked for me.
All the files were correct for me but still there was this error. I just created classes using default templates in Android Studio
File > Invalidate Caches/Restart > Invalidate Cache and Restart (DIalog box)
For Eclipse
Clean the project and reload it again.

In my case the problem was the Theme!

The application has stopped unexpectedly. Please try again. Error

I get the following error from the emulator in Eclipse when I run an Android application...
"The application has stopped unexpectedly. Please try again"
There are no error icons appearing in the project folder in Eclipse. I have already tried...
Cleaning the Project
Android Tools > Fix Project Properties
Updating the Build Path
My Error Log is saying...
"java.lang.RuntimeException: Unable to instantiate activity ComponentInfo..."
The Error Log goes onto say...
"Caused by: java.lang.ClassNotFoundException..."
Just to note that I do not have a "Build.xml" file in my project folder but instead a "apktool.yml" if this makes any difference.
Any suggestions??
EDIT:
Here's the manifest file...
<?xml version="1.0" encoding="UTF-8"?>
<manifest android:versionCode="61" android:versionName="1.2.2" package="com.__.__"
xmlns:android="http://schemas.android.com/apk/res/android">
<uses-sdk android:minSdkVersion="10" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application android:label="#string/app_name" android:icon="#drawable/ic_launcher">
<activity android:label="#string/app_name" android:name=".MTActivity" android:screenOrientation="portrait">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:label="#string/app_name" android:name=".RCActivity" android:screenOrientation="portrait" />
...
Errors generated LogCat...
E/AndroidRuntime(6220): FATAL EXCEPTION: main
E/AndroidRuntime(6220): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.ir.mtools/com.ir.mtools.MTActivity}: java.lang.ClassNotFoundException:
com.irtza.pulmtools.MTActivity in loader dalvik.system.PathClassLoader[/data/app/com.ir.mtools-1.apk]
E/AndroidRuntime(6220): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1573)
E/AndroidRuntime(6220): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
E/AndroidRuntime(6220): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
E/AndroidRuntime(6220): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
E/AndroidRuntime(6220): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(6220): at android.os.Looper.loop(Looper.java:130)
E/AndroidRuntime(6220): at android.app.ActivityThread.main(ActivityThread.java:3687)
E/AndroidRuntime(6220): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(6220): at java.lang.reflect.Method.invoke(Method.java:507)
E/AndroidRuntime(6220): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
E/AndroidRuntime(6220): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
E/AndroidRuntime(6220): at dalvik.system.NativeStart.main(Native Method)
E/AndroidRuntime(6220): Caused by: java.lang.ClassNotFoundException: com.ir.mtools.MTActivity in loader dalvik.system.PathClassLoader[/data/app/com.ir.mtools-1.apk]

Whenever this happens it means your application has encountered a runtime exception, which means no errors will show up at compile time. In this case I'm guessing you have not declared the activity in the AndroidManifest.xml file, but without seeing more code that's only a guess.

java.lang.ClassNotFoundException: com.ir.mtools.MTActivity
Is com.ir.mtools.MTActivity this part of some library? if so have you included it in your build path ?

"Error Inflating Class Fragment" on Android 4.2.x

I've been debugging for hours now and still no luck. I made a RSS Reader using Android fragments. It works amazingly well on devices running Android 4.0.x to 4.1.x but crashes on start on Android 4.2.x devices.
I'd really appreciate any help I can get.
Logcat:
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.impsycho.androidpakistan/com.impsycho.androidpakistan.ItemListActivity}:
android.view.InflateException: Binary XML file line #1: Error inflating class fragment
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$MethodAndArgsCaller.run(ZygoteInit.java:793)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #1: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.inflate(LayoutInflater.java:466)
at android.view.LayoutInflater.inflate(LayoutInflater.java:396)
at android.view.LayoutInflater.inflate(LayoutInflater.java:352)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:270)
at android.app.Activity.setContentView(Activity.java:1881)
at com.impsycho.androidpakistan.ItemListActivity.onCreate(ItemListActivity.java:13)
at android.app.Activity.performCreate(Activity.java:5104)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
... 11 more
Caused by: java.lang.NullPointerException
at com.impsycho.androidpakistan.ItemListFragment$GetAllThePosts.onPreExecute(ItemListFragment.java:157)
at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:586)
at android.os.AsyncTask.execute(AsyncTask.java:534)
at com.impsycho.androidpakistan.ItemListFragment.onCreate(ItemListFragment.java:54)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:835)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1061)
at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1160)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:272)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:676)
... 20 more
Sending signal. PID: 30286 SIG: 9
Main Activity:
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;
public class ItemListActivity extends FragmentActivity implements ItemListFragment.Callbacks {
private boolean mTwoPane;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_item_list);
getActionBar().setDisplayShowTitleEnabled(false);
if (findViewById(R.id.item_detail_container) != null) {
mTwoPane = true;
((ItemListFragment) getSupportFragmentManager()
.findFragmentById(R.id.item_list))
.setActivateOnItemClick(true);
}
}
...
activity_item_list.xml
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/item_list"
android:name="com.impsycho.androidpakistan.ItemListFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ItemListActivity" />
activity_item_twopane.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:divider="?android:attr/dividerHorizontal"
android:orientation="horizontal"
android:showDividers="middle"
tools:context=".ItemListActivity" >
<fragment
android:id="#+id/item_list"
android:name="com.impsycho.androidpakistan.ItemListFragment"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="2.5" />
<FrameLayout
android:id="#+id/item_detail_container"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_marginLeft="5dp"
android:layout_marginRight="5dp"
android:layout_weight="5" />
</LinearLayout>

Okay, so I figured out what was wrong.
I was focusing on the wrong error. The error was actually in my method GetAllThePosts() which is called when the app is started, because of which the layout could not be inflated. And it's not even an error because it works perfectly well in all other Android versions.
For some reason, you can't change the view of menu items while the app is starting in Android 4.2.x
The code responsible was:
private class GetAllThePosts extends AsyncTask<Void, Void, Void> {
protected void onPreExecute() {
RefreshMenuButton.setActionView(R.layout.action_progress);
RefreshMenuButton.expandActionView();
...
I just added a conditional statement to check if we were on Android 4.2 and higher. If we are it won't run the first time.

Android with Eclipse - InflateException on FrameLayout error

I just put together a new Android project in Eclipse, and so far I only have one package with one activity (the auto-generated code from Eclipse), and all I did was add two buttons to the main.xml layout file.
When I try to debug the app, the emulator crashes and I get the error "Binary XML file line #31: Error inflating class android.widget.FrameLayout."
I'm not even using FrameLayout!
Here is the layout file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="#99CCFF">
<Button
android:id="#+id/btn1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New" />
<Button
android:id="#+id/btn2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Save" />
</LinearLayout>
And here is the main Activity file (again, this is just the default code that Eclipse generates when you create a new project):
package com.myapp.main;
import android.app.Activity;
import android.os.Bundle;
public class MyApp extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
And just for the heck of it, here's the manifest file as well:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.myapp.main"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="8" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:name="com.myapp.main.MyApp"
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>
So far as I can see, this is 99% auto-generated code, and I can see no reason why I would be getting an InflateException on "FrameLayout" when I'm not even using a FrameLayout.
So very confused ...
Here is what I get in LogCat:
FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myapp.main/com.myapp.main.MyApp}: android.view.InflateException: Binary XML file line #31: Error inflating class android.widget.FrameLayout
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1736)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1752)
at android.app.ActivityThread.access$1500(ActivityThread.java:123)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:993)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:126)
at android.app.ActivityThread.main(ActivityThread.java:3997)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:491)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
at dalvik.system.NativeStart.main(Native Method)
Caused by: android.view.InflateException: Binary XML file line #31: Error inflating class android.widget.FrameLayout
at android.view.LayoutInflater.createView(LayoutInflater.java:596)
at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
at android.view.LayoutInflater.onCreateView(LayoutInflater.java:644)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:669)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:724)
at android.view.LayoutInflater.inflate(LayoutInflater.java:479)
at android.view.LayoutInflater.inflate(LayoutInflater.java:391)
at android.view.LayoutInflater.inflate(LayoutInflater.java:347)
at com.android.internal.policy.impl.PhoneWindow.generateLayout(PhoneWindow.java:2456)
at com.android.internal.policy.impl.PhoneWindow.installDecor(PhoneWindow.java:2516)
at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:220)
at android.app.Activity.setContentView(Activity.java:1777)
at com.myapp.main.MyApp.onCreate(MyApp.java:20)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1700)

I'm having trouble seeing what's wrong with your code as well. Could you copy and paste the entire stack trace you get when your app crashes? I think it might give us more of an insight as to what is going on.
You can either get the stack trace from Logcat in Eclipse, or you can open a terminal and type "adb logcat"