В исходной активности реализовано подключение к БД и вывод в спинер информации о "Людях". При выборе элемента из списка возвращается id человека, которое передается в новую активность по нажатию на кнопку.
Код: Выделить всё
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.SimpleCursorAdapter;
import android.widget.Spinner;
public class MainActivity extends Activity {
String LOG_TAG="myLogs";
Spinner snFind;
DB db;
Cursor cursor;
SimpleCursorAdapter scAdapter;
String IdPeople;
Intent intent;
int to[]={R.id.tvPid, R.id.tvPsname,R.id.tvPsname,R.id.tvPgroup};
String from[]={DB.COLUMN_PEOPLE_ID, DB.COLUMN_PEOPLE_SNAME,DB.COLUMN_PEOPLE_NAME,DB.COLUMN_PEOPLE_GROUP};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
snFind=(Spinner) findViewById(R.id.snFind);
db= new DB(this);
db.open();
startManagingCursor(cursor);
cursor= db.showTableData(DB.TABLE_PEOPLE, false);
scAdapter= new SimpleCursorAdapter(this, R.layout.itemp, cursor, from, to);
snFind.setAdapter(scAdapter) ;
snFind.setOnItemSelectedListener( new OnItemSelectedListener(){
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) { // TODO Auto-generated method stub
IdPeople= id+"";
Log.d(LOG_TAG,"mhy IdPeople="+"("+IdPeople+")"); }
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}} );
}
public void clickStart (View v){
intent= new Intent(this, Statistic.class);
intent.putExtra("id", IdPeople);
db.close();
startActivity(intent);
}
}
- 09-11 22:21:23.503: E/AndroidRuntime(902): FATAL EXCEPTION: main
09-11 22:21:23.503: E/AndroidRuntime(902): java.lang.RuntimeException: Unable to stop activity {com.example.myapplicatuin_mytest_v1/com.example.myapplicatuin_mytest_v1.MainActivity}: java.lang.NullPointerException
09-11 22:21:23.503: E/AndroidRuntime(902): at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:3142)
09-11 22:21:23.503: E/AndroidRuntime(902): at android.app.ActivityThread.handleStopActivity(ActivityThread.java:3188)
09-11 22:21:23.503: E/AndroidRuntime(902): at android.app.ActivityThread.access$900(ActivityThread.java:141)
09-11 22:21:23.503: E/AndroidRuntime(902): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1261)
09-11 22:21:23.503: E/AndroidRuntime(902): at android.os.Handler.dispatchMessage(Handler.java:99)
09-11 22:21:23.503: E/AndroidRuntime(902): at android.os.Looper.loop(Looper.java:137)
09-11 22:21:23.503: E/AndroidRuntime(902): at android.app.ActivityThread.main(ActivityThread.java:5041)
09-11 22:21:23.503: E/AndroidRuntime(902): at java.lang.reflect.Method.invokeNative(Native Method)
09-11 22:21:23.503: E/AndroidRuntime(902): at java.lang.reflect.Method.invoke(Method.java:511)
09-11 22:21:23.503: E/AndroidRuntime(902): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
09-11 22:21:23.503: E/AndroidRuntime(902): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
09-11 22:21:23.503: E/AndroidRuntime(902): at dalvik.system.NativeStart.main(Native Method)
09-11 22:21:23.503: E/AndroidRuntime(902): Caused by: java.lang.NullPointerException
09-11 22:21:23.503: E/AndroidRuntime(902): at android.app.Activity.performStop(Activity.java:5258)
09-11 22:21:23.503: E/AndroidRuntime(902): at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:3139)
09-11 22:21:23.503: E/AndroidRuntime(902): ... 11 more
