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POAndroid- Couldn't Call a method from Another Activity
 

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  1. POAndroid- Couldn't Call a method from Another Activity
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    <p>I'm developing an Android Application in which I have to verify whether the Device in Online or Offline mode (ie., I Have to verify whether the Connectivity Service is available or not ).</p> <p>I've two classes class A and Class B .</p> <p>In class A , I tried the code Snippets like below,</p> <pre><code>package com.example.onlineverification; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.Toast; public class MainActivity extends Activity { @Override protected void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button b=(Button)findViewById(R.id.button1); b.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub //new OnlineCheck().onCreate(savedInstanceState) Toast.makeText(MainActivity.this,"Online Verification "+new OnlineCheck().isOnline(), Toast.LENGTH_LONG).show(); } }); } } </code></pre> <p>In Class B,the Code Snippets that I've tried is given below,</p> <pre><code>package com.example.onlineverification; import android.app.Activity; import android.content.Context; import android.net.ConnectivityManager; import android.net.NetworkInfo; import android.os.Bundle; public class OnlineCheck extends Activity { public boolean isOnline() { ConnectivityManager conMgr = (ConnectivityManager) this .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo[] networkInfo = conMgr.getAllNetworkInfo(); boolean state=false; for(NetworkInfo nInfo:networkInfo){ if(nInfo.getType()==ConnectivityManager.TYPE_WIFI || nInfo.getType()==ConnectivityManager.TYPE_ETHERNET || nInfo.getType()==ConnectivityManager.TYPE_MOBILE){ if (nInfo.getState() == NetworkInfo.State.CONNECTED || nInfo.getState() == NetworkInfo.State.CONNECTING) { state=true; break; } } } return state; } } </code></pre> <p>when I click the button , the Application crashed and my Logcat error is given below,</p> <pre><code>08-23 10:55:29.152: E/AndroidRuntime(25945): FATAL EXCEPTION: main 08-23 10:55:29.152: E/AndroidRuntime(25945): java.lang.IllegalStateException: System services not available to Activities before onCreate() 08-23 10:55:29.152: E/AndroidRuntime(25945): at android.app.Activity.getSystemService(Activity.java:4463) 08-23 10:55:29.152: E/AndroidRuntime(25945): at com.example.onlineverification.OnlineCheck.isOnline(OnlineCheck.java:18) 08-23 10:55:29.152: E/AndroidRuntime(25945): at com.example.onlineverification.MainActivity$1.onClick(MainActivity.java:24) 08-23 10:55:29.152: E/AndroidRuntime(25945): at android.view.View.performClick(View.java:4204) 08-23 10:55:29.152: E/AndroidRuntime(25945): at android.view.View$PerformClick.run(View.java:17355) 08-23 10:55:29.152: E/AndroidRuntime(25945): at android.os.Handler.handleCallback(Handler.java:725) 08-23 10:55:29.152: E/AndroidRuntime(25945): at android.os.Handler.dispatchMessage(Handler.java:92) 08-23 10:55:29.152: E/AndroidRuntime(25945): at android.os.Looper.loop(Looper.java:137) 08-23 10:55:29.152: E/AndroidRuntime(25945): at android.app.ActivityThread.main(ActivityThread.java:5041) 08-23 10:55:29.152: E/AndroidRuntime(25945): at java.lang.reflect.Method.invokeNative(Native Method) 08-23 10:55:29.152: E/AndroidRuntime(25945): at java.lang.reflect.Method.invoke(Method.java:511) 08-23 10:55:29.152: E/AndroidRuntime(25945): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 08-23 10:55:29.152: E/AndroidRuntime(25945): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 08-23 10:55:29.152: E/AndroidRuntime(25945): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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    1. USRakesh L
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      1. POAndroid- Couldn't Call a method from Another Activity
      1. USNightSkyCode
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    1. CO-u just used static keyword for calling method in another class.
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      1. POAndroid- Couldn't Call a method from Another Activity
      1. USFarhaSameer786
    2. COWhy woul you put such little code in a class like that.. Just keep it in your original activity
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      1. USNightSkyCode
    3. COSee my answer and try. Let me know if there is any issue
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      1. POAndroid- Couldn't Call a method from Another Activity
      1. USPankaj Kumar
 

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