Android ID给定空指针异常
我正在尝试制作一个简单的联系人列表应用程序，当我试图通过“活动”通过“结果”点击电话列表来编辑我的联系人时，编辑后当我按下“保存”按钮时，它通过抛出“Android ID给定空指针异常,android,eclipse,sqlite,nullpointerexception,Android,Eclipse,Sqlite,Nullpointerexception,我正在尝试制作一个简单的联系人列表应用程序，当我试图通过“活动”通过“结果”点击电话列表来编辑我的联系人时，编辑后当我按下“保存”按钮时，它通过抛出“id=null”来给我空指针异常。我调试应用程序，当我点击联系人在列表上编辑时，它会得到id，但当我保存编辑部分时，id为null。 以下是源代码： public class WebpreneurActivity extends ListActivity { private static final int CONTACT_CREATE
id=nullpublic 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;
}
}
}
}
01-29 12:33:05.090:E/AndroidRuntime（29585）：。。。11更多//您正在分配id，只要
i.putExtra(DBHandler.Key_ID, c.getLong(c.getColumnIndex(DBHandler.Key_ID)));
String id = data.getStringExtra(DBHandler.Key_ID);
long id = data.getLongExtra(DBHandler.Key_ID);
logcat错误在哪里？在哪一行出现空指针异常？我在onactivityresult中的代码中提到了这一点，在这里“String id=data.getStringExtra（DBHandler.Key_id）；”long id=data.getLongExtra（DBHandler.Key_id）；是不可行的，是说添加一个以上的参数，这是默认的长值