Hi,
I am creating service which will run in the background and contain a
blocking list (implemented using ArrayList) which may be used later
by other activites.
My Problem:-
>From my activity Services Demo I pass data to my service using
dataIntent.putExtra("originator", x);
this is fine but when I try to store this data in my Service in an
ArrayList called Items I get an exception and I cannot figure out
why.
The problem is in my Service code MyService :
if(items.contains(ORIG)){
Log.d(TAG, "Element already exists exiting ");
} else {
Log.d(TAG, "Adding Element");
items.add(ORIG);
}
Please help.
EXCEPTION
java.lang.RuntimeException: Unable to start service ...... with
intent
caused by: java.lang.NullPointerException
Best Regards,
Graham
CODE Eclipse
Activity -> ServicesDemo
Service -> MyService
ACTIVITY ServicesDemo
package com.example;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class ServicesDemo extends Activity implements OnClickListener
{
private static final String TAG = "ServicesDemo";
Button buttonStart, buttonStop;
EditText Input;
String x = ""; //test pass to my service
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
buttonStart = (Button) findViewById(R.id.buttonStart);
buttonStop = (Button) findViewById(R.id.buttonStop);
Input = (EditText) findViewById(R.id.INPUT);
buttonStart.setOnClickListener(this);
buttonStop.setOnClickListener(this);
}
public void onClick(View src) {
switch (src.getId()) {
case R.id.buttonStart:
Log.d(TAG, "onClick: starting srvice");
Intent dataIntent = new Intent(ServicesDemo.this,
MyService.class);
x = Input.getText().toString();
dataIntent.putExtra("originator", x);
startService(dataIntent);
break;
case R.id.buttonStop:
Log.d(TAG, "onClick: stopping srvice");
//implicit starting
stopService(new Intent(this, MyService.class));
break;
}
}
public static String getTag() {
return TAG;
}
}
-----------------------------------<end ACTIVITY>
--Service MyService ---------
package com.example;
import java.util.ArrayList;
import android.app.Service;
import android.content.Intent;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
public class MyService extends Service {
ArrayList<String> items;
public String ORIG = "";
private static final String TAG = "MyService";
public Bundle data = new Bundle();
@Override
public IBinder onBind(Intent intent) {
return null;
}
public static String getTag() {
return TAG;
}
@Override
public void onCreate() {
Toast.makeText(this, "My Service Created",
Toast.LENGTH_LONG).show();
Log.d(TAG, "onCreate");
}
@Override
public void onDestroy() {
Toast.makeText(this, "My Service Stopped",
Toast.LENGTH_LONG).show();
Log.d(TAG, "onDestroy");
}
@Override
public void onStart(Intent intent, int startid) {
Log.d(TAG, "onStart");
data = intent.getExtras();
ORIG = data.getString("originator");
Toast.makeText(this, "My Service Started with passed in value "
+
ORIG, Toast.LENGTH_LONG).show();
if(items.contains(ORIG)){
Log.d(TAG, "Element already exists exiting ");
} else {
Log.d(TAG, "Adding Element");
items.add(ORIG);
}
Thread initBkgdThread = new Thread(new Runnable() {
public void run() {
//print_result();
}
});
initBkgdThread.start();
}
public void print_result(String orig){
Log.d(TAG, "HELLO WORLD:" + orig);
}
}
--------------end of service-----------
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