How to call MainActivity function from the extended BroadcastReceiver class

Question

I can not find answer for this problem. I am building some Android application based on sms services and I found callback very difficult. I want/need to call my primary application class MainActivity from inside function onReceive (class SMSReceiver). Toast works perfectly but any attempt to call public void OnSmsReceived() (class MainActivity) is unsuccessful.

// Main class
public class MainActivity extends Activity {
  public void OnSmsReceived() {
    System.out.println(TAG + ": OnSmsReceived " + "OK ");
  }
  /* more not important at this moment code bellow */
}


// Brodcast class
public class SMSReceiver extends BroadcastReceiver {
  private static final String TAG = "SMSReceiver";
  @Override
  public void onReceive(Context context, Intent intent) {
    Toast.makeText(context, "SMS received.", Toast.LENGTH_LONG).show();
    System.out.println(TAG + ": " + "onReceive");

    //How to call MainActivity form here?

  }
}

Answer 1

Ok, I finaly made that working:
This is really working code
Thank you for intent ...

//Android Manifest
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="sms.pack.sms201"
    android:versionCode="1"
    android:versionName="1.0" >
    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="8" />
    <uses-permission android:name="android.permission.BROADCAST_SMS"/>
    <uses-permission android:name="android.permission.READ_SMS" />
    <uses-permission android:name="android.permission.SEND_SMS" />
    <uses-permission android:name="android.permission.RECEIVE_SMS" />
    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="sms.pack.sms201.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>        
        <receiver 
            android:name="sms.pack.sms201.SMSReceiver" 
            android:enabled="true" 
            android:exported="true" 
            android:permission="android.permission.BROADCAST_SMS"> 
            <intent-filter android:priority="1000"> 
                <action android:name="android.provider.Telephony.SMS_RECEIVED"/> 
            </intent-filter> 
        </receiver>        
    </application>
</manifest>

//SMSReceiver class
public class SMSReceiver extends BroadcastReceiver {
  private static final String TAG = "SMSReceiver";
  public static String Test = "empty";
  @Override
  public void onReceive(Context context, Intent intent) {
    Log.v(TAG, "onReceive");
    Toast.makeText(context, "SMS received.", Toast.LENGTH_LONG).show();
    Bundle bundle = intent.getExtras();
    if( bundle != null) {
      Log.v(TAG, "onReceive.bundle != null");
      Test = String.valueOf(bundle.size());
    }    
    Intent callingIntent = new Intent(context, MainActivity.class);
    callingIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    callingIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
    String value = "Extra val=" + Test;
    callingIntent.putExtra("SMSR", value);
    context.startActivity(callingIntent);    
  }
}

//MainActivity class
public class MainActivity extends Activity {
  private static final String TAG = "MainActivity";
  TextView tvGenLog;    
    protected void appendGenLog(String txt) {
      txt = tvGenLog.getText() + txt + "\r\n";
        tvGenLog.setText(txt);
    }
    private String memberFieldString;
    @Override
  protected void onNewIntent(Intent intent) {
    appendGenLog(TAG + ".onNewIntent");
    memberFieldString = intent.getStringExtra("SMSR");
    appendGenLog("memberFieldString=" + memberFieldString);    
    appendGenLog("Take data from SMSReceiver,");    
    appendGenLog("SMSR=" + SMSReceiver.Test);    
    super.onNewIntent(intent);
    } // End of onNewIntent(Intent intent)
  @Override
  protected void onResume() { 
    super.onResume();   
    //appendGenLog(TAG + ".onResume");   
    if (getIntent()!=null && getIntent().getExtras()!=null) {
      appendGenLog(TAG + ".onResume" + ":" + getIntent().getExtras().getString("SMSR"));  
    }
      else {
      appendGenLog(TAG + ".onResume" + ": null");  
    }
  }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);     
        Log.v(TAG, ".onCreate");        
        tvGenLog = (TextView) findViewById(R.id.tvGenLog);        
        appendGenLog(TAG + " Created");
    }   
  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
  }    
}