我試圖做一個簡單的聯繫人列表中的應用程序,當我試圖通過點擊手機名單上,通過對結果的活動,編輯後,編輯我接觸時,我按下了保存按鈕,它給我的空指針除了拋出「id=null
」.i調試應用程序,當我點擊聯繫人列表上的編輯它獲得的ID,但是當保存編輯部分,它給ID爲null。 這裏是源代碼:ID給予空指針異常
public class WebpreneurActivity extends ListActivity {
private static final int CONTACT_CREATE = 0;
private static final int CONTACT_EDIT = 1;
public static long id1;
//select the second one, Android view menu
private static final int INSERT_ID = Menu.FIRST;
private static final int DELETE_ID = Menu.FIRST + 1;
private DBHandler dbHelper;
private Cursor c;
ImageButton imageButton;
public static long rowId;
@Override
protected void onCreate(Bundle savedInstanceState) {
Log.d("database1" ,"0");
Log.d("Your Location4", "ok4:");
super.onCreate(savedInstanceState);
Log.d("database1" ,"1");
setContentView(R.layout.activity_webpreneur);
Log.d("database1" ,"2");
dbHelper = new DBHandler(this);
Log.d("database1" ,"3");
dbHelper.open();
fillData();
//dbHelper.open();
//addListenerOnButton();
//dbHelper.addContact();
imageButton = (ImageButton) findViewById(R.id.imageButton1);
Log.d("database1" ,"button");
imageButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
Log.d("database1" ,"b4");
Intent i = new Intent(getApplicationContext(), ContactEdit.class);
startActivityForResult(i, CONTACT_CREATE);
Log.d("database1" ,"button3");
//fillData();
}
});
//dbHelper.close();
}
@SuppressWarnings("deprecation")
public void fillData() {
Log.d("Your Location4", "ok6:");
c = dbHelper.fetchAllRows();
Log.d("Your Location4", "ok8:");
//startManagingCursor(c);
Log.d("Your Location4", "ok2:");
NoIdCursorWrapper nc = new NoIdCursorWrapper(c, DBHandler.Key_ID);
ListAdapter adapter = new SimpleCursorAdapter(this,
R.layout.contact_row, nc, new String[] { DBHandler.Key_Name,
DBHandler.Key_Phone }, new int[] { R.id.name,
R.id.phonenumber });
setListAdapter(adapter);
}
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Intent i = new Intent(this, ContactEdit.class);
i.putExtra(DBHandler.Key_ID, c.getLong(c.getColumnIndex(DBHandler.Key_ID)));
i.putExtra(DBHandler.Key_Name, c.getString(c.getColumnIndex(DBHandler.Key_Name)));
i.putExtra(DBHandler.Key_Address, c.getString(c.getColumnIndex(DBHandler.Key_Address)));
i.putExtra(DBHandler.Key_Phone, c.getString(c.getColumnIndex(DBHandler.Key_Phone)));
i.putExtra(DBHandler.Key_Website, c.getString(c.getColumnIndex(DBHandler.Key_Home)));
startActivityForResult(i, CONTACT_EDIT);
}
protected void onActivityResult(int requestCode, int resultCode,
Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK) {
String name = data.getStringExtra(DBHandler.Key_Name);
String address = data.getStringExtra(DBHandler.Key_Address);
String mobile = data.getStringExtra(DBHandler.Key_Phone);
String home = data.getStringExtra(DBHandler.Key_Home);
switch (requestCode) {
case CONTACT_CREATE:
Log.d("Your Location4", "jj:");
dbHelper.createRow(name, address, mobile, home);
Log.d("Your Location4" , "ok90:");
fillData();
break;
case CONTACT_EDIT:
//null pointer exception////// String id = data.getStringExtra(DBHandler.Key_ID);
Log.d("Your Location4" , "ok9c:");
long rowId=Long.parseLong(id.trim());
Log.d("Your Location4" , "ok9b:");
if (rowId != (Long)null){
dbHelper.updateRow(rowId, name, address, mobile, home);
}
fillData();
break;
}
}
}
}
這是我的日誌貓//////////
12月1日至29日:33:05.070:W/dalvikvm(29585):主題ID = 1:螺紋帶未捕獲的異常退出(組= 0x4001d578) 12月1日至29日:33:05.090:E/AndroidRuntime(29585):致命異常:主 12月1日至29日:33:05.090:E/AndroidRuntime(29585):了java.lang.RuntimeException:失敗遞送結果ResultInfo {誰= NULL,請求= 1,結果= -1,數據=意向{(具有額外)}}到{活動com.webpreneur_contactlist/com.webpreneur_contactlist.WebpreneurActivity}:JAVA。 lang.NumberFormatException:ID 01-2 9 12:33:05.090:E/AndroidRuntime(29585):在android.app.ActivityThread.deliverResults(ActivityThread.java:2553) 12月1日至29日:33:05.090:E/AndroidRuntime(29585):在android.app .ActivityThread.handleSendResult(ActivityThread.java:2595) 12月1日至29日:33:05.090:E/AndroidRuntime(29585):在android.app.ActivityThread.access $ 2000(ActivityThread.java:121) 12月1日至29日: 33:05.090:E/AndroidRuntime(29585):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:973) 12月1日至29日:33:05.090:E/AndroidRuntime(29585):在android.os。 Handler.dispatchMessage(Handler.java:99) 01-29 12:33:05.090:E/AndroidRuntime(29585):在android.os.Looper.loop(Looper.java:138) 01-29 12點33: 05.090:E/AndroidRuntime(29585):在android.app.ActivityThread.main(ActivityThread.java:3701) 十二月1日至29日:3 3:05.090:E/AndroidRuntime(29585):在java.lang.reflect.Method.invokeNative(本機方法) 12月1日至29日:33:05.090:E/AndroidRuntime(29585):在java.lang.reflect.Method中.invoke(Method.java:507) 01-29 12:33:05.090:E/AndroidRuntime(29585):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:878) 01- 29 12:33:05.090:E/AndroidRuntime(29585):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:636) 12月1日至29日:33:05.090:E/AndroidRuntime(29585):在dalvik.system.NativeStart.main(本機方法) 12月1日至29日:33:05.090:E/AndroidRuntime(29585):java.lang.NumberFormatException:ID 12月1日至29日:33:05.090:致è/AndroidRuntime(29585):在java.lang.Long.parse(Long.java:353) 12月1日至29日:33:05.090:E/AndroidRuntime(29585):在java.lang.Long.pars eLong(Long.java:344) 01-29 12:33:05.090:E/AndroidRuntime(29585):at java.lang.Long.parseLong(Long.java:311) 01-29 12:33:05.090: E/AndroidRuntime(29585):at com.webpreneur_contactlist.WebpreneurActivity.onActivityResult(WebpreneurActivity.java:129) 01-29 12:33:05.090:E/AndroidRuntime(29585):at android.app.Activity.dispatchActivityResult(Activity。 java:3908) 01-29 12:33:05.090:E/AndroidRuntime(29585):at android.app.ActivityThread.deliverResults(ActivityThread.java:2549) 01-29 12:33:05.090:E/AndroidRuntime 29585):...11多
你的logcat錯誤在哪裏? – GrIsHu
你在哪一行得到Null POinter異常? – Piyush
我在onactivityresult裏面的代碼中提到了這一點,在這一點上「String id = data.getStringExtra(DBHandler.Key_ID);」 – Shazar