Look below "caused by" in the logcat to identify where the
NullPointerException occurrs. Then fix it.
23 ноября 2011 г. 15:36 пользователь Graham Bright <gbwienmobil...@gmail.com
> написал:
> Can anyone help?
>
> Thanks
> Graham
> On Nov 23, 2011 11:51 a.m., "Graham Bright" <gbwienmobil...@gmail.com>
> wrote:
>
>> 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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