I am asking this because after reading that , android depend upon components thats why they have removed main() method from, but can we not create a program by adding main() at one place than when ever we need internet.
Than we can place another Internet's main() method and pausing previous main method ?
At AndroidManifest.xml you need a LAUNCHER activity, and 2 more for network and no network like:
<activity
android:name="your.package.StartActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="your.package.NetworkActivity" >
</activity>
<activity
android:name="your.package.NoNetworkActivity" >
</activity>
At StartActivity.java check connectivity and then choose what activity to start:
public class StartActivity extends Activity {
//...
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// here do the job!!!
boolean iAmConnected = checkNetwork(); // you need to implement that
if(iAmConnected) {
// start network activity
Intent intent = new Intent(this, NetworkActivity.class);
startActivity(intent);
} else {
// start no network activity
Intent intent = new Intent(this, NoNetworkActivity.class);
startActivity(intent);
}
}
//...
}
StartActivity can have a setContentView(R.layout.a_splash_screen); or no content view.
main() method is only entry point for many languages , same like java android expects some entry point to start the Application (first screen) , in android we will specify which activity has to be started in android manifest file using Intent Filter
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
when the activity started (First Screen is visible to User) it will call the onCreate(Bundle b) method ...activity life cycle methods
