I am writing an Android application which can enable
and disable the Network
Data packet connection. I am also using one broadcast receiver to check the Network
Data packet connection. I have registered broadcast receiver
and provided required permission in Manifest file. But when I run this application it changes the connection state
and after that it crashes. But when I don't include this broadcast receiver it works fine. I am not able to see any kind of log which can provide some clue.
Here is my code for broadcast receiver.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.rakesh.simplewidget"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk android:minSdkVersion="10" />
<!-- Permissions -->
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.MODIFY_PHONE_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".SimpleWidgetExampleActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!--
<receiver
android:name=".ExampleAppWidgetProvider"
android:label="Widget ErrorBuster" >
<intent-filter>
<action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
</intent-filter>
<meta-data
android:name="android.appwidget.provider"
android:resource="@xml/widget1_info" />
</receiver>
-->
<receiver android:name=".ConnectivityReceiver" >
<intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
</intent-filter>
</receiver>
</application>
</manifest>
My Broadcast receiver class is as following.
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;
public class ConnectivityReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
NetworkInfo info = (NetworkInfo)intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
if(info.getType() == ConnectivityManager.TYPE_MOBILE){
if(info.isConnectedOrConnecting()){
Log.e("RK","Mobile
data is connected");
}else{
Log.e("RK","Mobile
data is disconnected");
}
}
}
}
my Main activity file.
package com.rakesh.simplewidget;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.net.ConnectivityManager;
import android.os.Bundle;
import android.telephony.TelephonyManager;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class SimpleWidgetExampleActivity extends Activity {
private Button btNetworkSetting;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btNetworkSetting = (Button)findViewById(R.id.btNetworkSetting);
if(checkConnectivityState(getApplicationContext())){
btNetworkSetting.setBackgroundColor(Color.GREEN);
}else{
btNetworkSetting.setBackgroundColor(Color.GRAY);
}
}
public void openNetworkSetting(View view){
Method dataConnSwitchmethod;
Class telephonyManagerClass;
Object ITelephonyStub;
Class ITelephonyClass;
Context context = view.getContext();
boolean enabled = !checkConnectivityState(context);
final ConnectivityManager conman = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
try{
final Class conmanClass = Class.forName(conman.getClass().getName());
final Field iConnectivityManagerField = conmanClass.getDeclaredField("mService");
iConnectivityManagerField.setAccessible(true);
final Object iConnectivityManager = iConnectivityManagerField.get(conman);
final Class iConnectivityManagerClass = Class.forName(iConnectivityManager.getClass().getName());
final Method setMobileDataEnabledMethod = iConnectivityManagerClass.getDeclaredMethod("setMobileDataEnabled", Boolean.TYPE);
setMobileDataEnabledMethod.setAccessible(true);
setMobileDataEnabledMethod.invoke(iConnectivityManager, enabled);
if(enabled){
Toast.makeText(view.getContext(), "Enabled Network
Data", Toast.LENGTH_LONG).show();
view.setBackgroundColor(Color.GREEN);
}
else{
Toast.makeText(view.getContext(), "Disabled Network
Data", Toast.LENGTH_LONG).show();
view.setBackgroundColor(Color.LTGRAY);
}
}catch(Exception e){
Log.e("Error", "some error");
Toast.makeText(view.getContext(), "It didn't work", Toast.LENGTH_LONG).show();
}
}
private boolean checkConnectivityState(Context context){
final TelephonyManager telephonyManager = (TelephonyManager) context
.getSystemService(Context.TELEPHONY_SERVICE);
ConnectivityManager af ;
return telephonyManager.getDataState() == TelephonyManager.DATA_CONNECTED;
}
}
Log file:
java.lang.RuntimeException: Unable to instantiate receiver com.rakesh.simplewidget.ConnectivityReceiver: java.lang.ClassNotFoundException: com.rakesh.simplewidget.ConnectivityReceiver in loader dalvik.system.PathClassLoader[/data/app/com.rakesh.simplewidget-2.apk]
E/AndroidRuntime(26094): at android.app.ActivityThread.handleReceiver(ActivityThread.java:1777)
E/AndroidRuntime(26094): at android.app.ActivityThread.access$2400(ActivityThread.java:117)
E/AndroidRuntime(26094): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:985)
E/AndroidRuntime(26094): at android.os.Handler.dispatchMessage(Handler.java:99)
E/AndroidRuntime(26094): at android.os.Looper.loop(Looper.java:130)
E/AndroidRuntime(26094): at android.app.ActivityThread.main(ActivityThread.java:3691)
E/AndroidRuntime(26094): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime(26094): at java.lang.reflect.Method.invoke(Method.java:507)
E/AndroidRuntime(26094): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907)
E/AndroidRuntime(26094): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665)
E/AndroidRuntime(26094): at dalvik.system.NativeStart.main(Native Method)
It seems Android is not able to recognize file Broadcast Receiver class. Any idea why I am getting this error?
PS: Some information about Android environment
and platform.
- Android API 10.
- Running on Samsung Galaxy II which has android 2.3.6
Edit:
my broadcast receiver file ConnectivityReceiver.java was present in default package
and it was not being recognized by Android. Android was looking for this file in current package i.e com.rakesh.simplewidget; I just moved connectivityReciever.java file to com.rakesh.simplewidget package
and problem was solved.
