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Asked: 2026-06-04T21:53:09+00:00

I have written a small code for usb detection for android device but its

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I have written a small code for usb detection for android device but its crashing while I connect the device cable to CPU of my computer

Here is my code

public class IntentReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        // TODO Auto-generated method stub

        if(intent.getAction().equals(Intent.ACTION_UMS_CONNECTED))

        {

            Toast.makeText(context, "mounted", Toast.LENGTH_LONG).show();
            Log.i("ANDROID DEVICE IS","CONNECTED");
            System.out.println(" ANDROID DEVICE IS CONNECTED");
            // Intent myStarterIntent = new Intent(context, CarHome.class);
            //   myStarterIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            //   context.startActivity(myStarterIntent);
        }

        else if(intent.getAction().equals(Intent.ACTION_UMS_DISCONNECTED)){

            Toast.makeText(context, "Unmounted", Toast.LENGTH_LONG).show();
            Log.i("ANDROID DEVICE IS","DISCONNECTED");  
            System.out.println(" ANDROID DEVICE IS NOT CONNECTED");
        }
    }

}

Manifest file is here

<receiver android:name=".IntentReceiver">
    <intent-filter>
      <action android:name="android.intent.action.ACTION_UMS_CONNECTED" />
      <action android:name="android.intent.action.ACTION_UMS_DISCONNECTED" />
      <action android:name="android.intent.action.ACTION_POWER_CONNECTED" />
    </intent-filter>
</receiver>

Logcat showing these errors

05-25 15:30:08.350: E/AndroidRuntime(3457):     at android.app.ActivityThread.handleReceiver(ActivityThread.java:1785)
05-25 15:30:08.350: E/AndroidRuntime(3457):     at android.app.ActivityThread.access$2400(ActivityThread.java:121)
05-25 15:30:08.350: E/AndroidRuntime(3457):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:993)
05-25 15:30:08.350: E/AndroidRuntime(3457):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-25 15:30:08.350: E/AndroidRuntime(3457):     at android.os.Looper.loop(Looper.java:130)
05-25 15:30:08.350: E/AndroidRuntime(3457):     at android.app.ActivityThread.main(ActivityThread.java:3701)
05-25 15:30:08.350: E/AndroidRuntime(3457):     at java.lang.reflect.Method.invokeNative(Native Method)
05-25 15:30:08.350: E/AndroidRuntime(3457):     at java.lang.reflect.Method.invoke(Method.java:507)
05-25 15:30:08.350: E/AndroidRuntime(3457):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
05-25 15:30:08.350: E/AndroidRuntime(3457):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624)
05-25 15:30:08.350: E/AndroidRuntime(3457):     at dalvik.system.NativeStart.main(Native Method)
05-25 15:30:08.350: E/AndroidRuntime(3457): Caused by: java.lang.ClassNotFoundException: com.kk88655.hello.IntentReceiver in loader dalvik.system.PathClassLoader[/data/app/com.kk88655.hello-2.apk]
05-25 15:30:08.350: E/AndroidRuntime(3457):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
05-25 15:30:08.350: E/AndroidRuntime(3457):     at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
05-25 15:30:08.350: E/AndroidRuntime(3457):     at  java.lang.ClassLoader.loadClass(ClassLoader.java:511)

Latest logcat messages

05-25 17:51:32.878: E/AndroidRuntime(5602): FATAL EXCEPTION: main
05-25 17:51:32.878: E/AndroidRuntime(5602): java.lang.RuntimeException: Unable to instantiate receiver com.kk88655.hello.IntentReceiver: java.lang.ClassNotFoundException: com.kk88655.hello.IntentReceiver in loader dalvik.system.PathClassLoader[/data/app/com.kk88655.hello-1.apk]
05-25 17:51:32.878: E/AndroidRuntime(5602):     at android.app.ActivityThread.handleReceiver(ActivityThread.java:1785)
05-25 17:51:32.878: E/AndroidRuntime(5602):     at android.app.ActivityThread.access$2400(ActivityThread.java:121)
05-25 17:51:32.878: E/AndroidRuntime(5602):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:993)
05-25 17:51:32.878: E/AndroidRuntime(5602):     at android.os.Handler.dispatchMessage(Handler.java:99)
05-25 17:51:32.878: E/AndroidRuntime(5602):     at android.os.Looper.loop(Looper.java:130)
05-25 17:51:32.878: E/AndroidRuntime(5602):     at android.app.ActivityThread.main(ActivityThread.java:3701)
05-25 17:51:32.878: E/AndroidRuntime(5602):     at java.lang.reflect.Method.invokeNative(Native Method)
05-25 17:51:32.878: E/AndroidRuntime(5602):     at java.lang.reflect.Method.invoke(Method.java:507)
05-25 17:51:32.878: E/AndroidRuntime(5602):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
05-25 17:51:32.878: E/AndroidRuntime(5602):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624)
05-25 17:51:32.878: E/AndroidRuntime(5602):     at dalvik.system.NativeStart.main(Native Method)
05-25 17:51:32.878: E/AndroidRuntime(5602): Caused by: java.lang.ClassNotFoundException: com.kk88655.hello.IntentReceiver in loader dalvik.system.PathClassLoader[/data/app/com.kk88655.hello-1.apk]
05-25 17:51:32.878: E/AndroidRuntime(5602):     at dalvik.system.PathClassLoader.findClass(PathClassLoader.java:240)
05-25 17:51:32.878: E/AndroidRuntime(5602):     at java.lang.ClassLoader.loadClass(ClassLoader.java:551)
05-25 17:51:32.878: E/AndroidRuntime(5602):     at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
05-25 17:51:32.878: E/AndroidRuntime(5602):     at android.app.ActivityThread.handleReceiver(ActivityThread.java:1776)
05-25 17:51:32.878: E/AndroidRuntime(5602):     ... 10 more
05-25 17:51:32.878: W/ActivityManager(238):   Force finishing activity com.kk88655.hello/.CarHome
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1 Answer

  1. Editorial Team

    You should read the docs:

    ACTION_UMS_CONNECTED

    This constant is deprecated. replaced by
    android.os.storage.StorageEventListener

    Broadcast Action: The device has entered USB Mass Storage mode. This
    is used mainly for the USB Settings panel. Apps should listen for
    ACTION_MEDIA_MOUNTED and ACTION_MEDIA_UNMOUNTED broadcasts     to be
    notified when the SD card file system is mounted or unmounted

    Against your ClassNotFoundException:

    In your manifest, you prefixed the class-name of your BoradcastReceiver with a period, which is a shortcut. It will take the package-name you specified in your <manifest>-tags package-attribute and add the given class-name to it.

    So, you should make sure that your fully qualified class-path is com.kk88655.hello.IntentReceiver, because it seems that you renamed the hello-package to hello2 (as seen in the logcat: /data/app/com.kk88655.hello-2.apk).

    A similar question has already been asked here: Android Broadcast Receiver Error: Class not found exception with no accepted or up-voted answer so far.

    Another idea would be to specify the fully-qualified package-name in the <receiver>-tags android:name-attribute, as suggested here: Unable to instantiate receiver in BroadcastReceiver SMS

    Another explanation might be an update-issue with your older application-version as discussed here: ClassNotFoundException error reports when upgrading Android app Reading this question, it also might be an App2SD problem.

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