我在android中有服务，从那个服务我开始了一个活动。我从服务中调用了活动中的方法。在那个方法中，我打开数据库并尝试插入值。不使用数据库，它工作正常。但是我的应用程序当我使用数据库时强制关闭
插件（java文件）-->服务-->活动（这里我尝试将数据插入数据库）
服务.java
public class MyService extends Service
{
@Override
public IBinder onBind(Intent intent)
{
return null;
}
@Override
public void onCreate()
{
Log.d(TAG, "onCreate");
}
@Override
public void onDestroy()
{
Log.d(TAG, "onDestroy");
}
public void onStart(Intent intent, int startid)
{
Timer mTimer = new Timer(user);
mTimer.scheduleAtFixedRate(new mainTask(), 5000,60000);//1 hour=3600 s
}
private class mainTask extends TimerTask
{
public void run()
{
toastHandler.sendEmptyMessage(0);
}
}
private final Handler toastHandler = new Handler()
{
public void handleMessage(Message msg)
{
StorageHelper s=new StorageHelper();
String a= s.UpdateValues(userid);
}
};
}
活动.java
public class StorageHelper extends Activity
{
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
}
public String UpdateValues(int userid)
{
try {
DBAdapter1 database=new DBAdapter1(this);
database.open();
long id=database.insert(71,4,"yes");
database.close();
} catch (SQLException e) {
}
return "success";
}
}
请注意 ，当我在 oncreate 中打开数据库时，它的工作，但在 updatavalues() 数据库内部无法打开插入。
try {
DBAdapter1 database=new DBAdapter1(this);
database.open();
long id=database.insert(71,4,"yes");
database.close();
} catch (SQLException e) {
}
我有两种力量接近
错误编号 1
07-09 15:16:27.859: E/AndroidRuntime(1211): FATAL EXCEPTION: main
07-09 15:16:27.859: E/AndroidRuntime(1211): java.lang.NullPointerException
07-09 15:16:27.859: E/AndroidRuntime(1211): at android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:203)
07-09 15:16:27.859: E/AndroidRuntime(1211): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:98)
07-09 15:16:27.859: E/AndroidRuntime(1211): at com.app.mobilyzer.DBAdapter1.open(DBAdapter1.java:68)
07-09 15:16:27.859: E/AndroidRuntime(1211): at com.app.mobilyzer.StorageHelper.UpdateValues(StorageHelper.java:33)
07-09 15:16:27.859: E/AndroidRuntime(1211): at com.app.mobilyzer.MyService$1.handleMessage(MyService.java:121)
07-09 15:16:27.859: E/AndroidRuntime(1211): at android.os.Handler.dispatchMessage(Handler.java:99)
07-09 15:16:27.859: E/AndroidRuntime(1211): at android.os.Looper.loop(Looper.java:123)
07-09 15:16:27.859: E/AndroidRuntime(1211): at android.app.ActivityThread.main(ActivityThread.java:4627)
07-09 15:16:27.859: E/AndroidRuntime(1211): at java.lang.reflect.Method.invokeNative(Native Method)
07-09 15:16:27.859: E/AndroidRuntime(1211): at java.lang.reflect.Method.invoke(Method.java:521)
07-09 15:16:27.859: E/AndroidRuntime(1211): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-09 15:16:27.859: E/AndroidRuntime(1211): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-09 15:16:27.859: E/AndroidRuntime(1211): at dalvik.system.NativeStart.main(Native Method)
错误号 2
07-09 15:16:36.889: E/AndroidRuntime(1237): FATAL EXCEPTION: main
07-09 15:16:36.889: E/AndroidRuntime(1237): java.lang.RuntimeException: Unable to start service com.app.mobilyzer.MyService@44fc6280 with null: java.lang.NullPointerException
07-09 15:16:36.889: E/AndroidRuntime(1237): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3063)
07-09 15:16:36.889: E/AndroidRuntime(1237): at android.app.ActivityThread.access$3600(ActivityThread.java:125)
07-09 15:16:36.889: E/AndroidRuntime(1237): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2096)
07-09 15:16:36.889: E/AndroidRuntime(1237): at android.os.Handler.dispatchMessage(Handler.java:99)
07-09 15:16:36.889: E/AndroidRuntime(1237): at android.os.Looper.loop(Looper.java:123)
07-09 15:16:36.889: E/AndroidRuntime(1237): at android.app.ActivityThread.main(ActivityThread.java:4627)
07-09 15:16:36.889: E/AndroidRuntime(1237): at java.lang.reflect.Method.invokeNative(Native Method)
07-09 15:16:36.889: E/AndroidRuntime(1237): at java.lang.reflect.Method.invoke(Method.java:521)
07-09 15:16:36.889: E/AndroidRuntime(1237): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
07-09 15:16:36.889: E/AndroidRuntime(1237): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
07-09 15:16:36.889: E/AndroidRuntime(1237): at dalvik.system.NativeStart.main(Native Method)
07-09 15:16:36.889: E/AndroidRuntime(1237): Caused by: java.lang.NullPointerException
07-09 15:16:36.889: E/AndroidRuntime(1237): at com.app.mobilyzer.MyService.onStart(MyService.java:81)
07-09 15:16:36.889: E/AndroidRuntime(1237): at android.app.Service.onStartCommand(Service.java:420)
07-09 15:16:36.889: E/AndroidRuntime(1237): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3053)
07-09 15:16:36.889: E/AndroidRuntime(1237): ... 10 more