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在這裏，我試圖將我的RowId傳遞給另一個活動，但它打印null.in myprofile類，我試圖傳遞行ID。請任何人幫助我。如何在android中傳遞RowId？
我的資料類
public class MyProfile extends Activity implements OnClickListener
{
private MyProfileDb mDbHelper;
private TextView mAllergiesText;
private TextView mConditionsText;
private TextView mBloodText;
private TextView mNoteText;
private long mRowId ;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.myprofile);
mDbHelper = new MyProfileDb(this);
mDbHelper.open();
View home = findViewById(R.id.home);
home.setOnClickListener(this);
View add = findViewById(R.id.add);
add.setOnClickListener(this);
mAllergiesText = (TextView) findViewById(R.id.allergy);
mConditionsText = (TextView) findViewById(R.id.condition1);
mBloodText = (TextView) findViewById(R.id.blood1);
mNoteText = (TextView) findViewById(R.id.note);
Cursor c = mDbHelper.fetchAlldetails();
if (c.getCount() >= 1)
{
populateFields(c.getCount());
c.close();
}
}
public void onClick(View v)
{
switch (v.getId())
{
case R.id.home:
mDbHelper.close();
Intent homeActivity = new Intent(this, Menu.class);
startActivity(homeActivity);
finish();
break;
case R.id.add:
Intent addActivity = new Intent(this, EditMyProfile.class);
addActivity.putExtra("id", String.valueOf(mRowId));
System.out.println("id is"+ mRowId);
startActivity(addActivity);
mDbHelper.close();
break;
}
}
private void populateFields(int mRowId)
{
Cursor profile = mDbHelper.fetchdetails(mRowId);
startManagingCursor(profile);
mAllergiesText.setText(profile.getString(profile
.getColumnIndexOrThrow(MyProfileDb.KEY_ALLERGIES)));
mConditionsText.setText(profile.getString(profile
.getColumnIndexOrThrow(MyProfileDb.KEY_CONDITIONS)));
mBloodText.setText(profile.getString(profile
.getColumnIndexOrThrow(MyProfileDb.KEY_BLOOD)));
mNoteText.setText(profile.getString(profile
.getColumnIndexOrThrow(MyProfileDb.KEY_NOTE)));
profile.close();
}
@Override
public final boolean onKeyDown(int keyCode, KeyEvent event) {
if (KeyEvent.KEYCODE_BACK == keyCode) {
startActivity(new Intent(this, Menu.class));
onDestroy();
}
return super.onKeyDown(keyCode, event);
}
}
editmyprofile類
public class EditMyProfile extends Activity implements OnClickListener {
private EditText mAllergiesText;
private EditText mConditionsText;
private EditText mBloodText;
private EditText mNoteText;
private Long mRowId;
private MyProfileDb mDbHelper;
private int i;
//private Long id;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.editmyprofile);
mDbHelper = new MyProfileDb(this);
mDbHelper.open();
View profilecancel = findViewById(R.id.profilecancel);
profilecancel.setOnClickListener(this);
mAllergiesText = (EditText) findViewById(R.id.allergies);
mConditionsText = (EditText) findViewById(R.id.condition);
mBloodText = (EditText) findViewById(R.id.blood);
mNoteText = (EditText) findViewById(R.id.note);
View save = findViewById(R.id.profilesave);
save.setOnClickListener(this);
View doccancel = findViewById(R.id.profilecancel);
doccancel.setOnClickListener(this);
View homeText = findViewById(R.id.homeInEditProfile);
homeText.setOnClickListener(this);
View home = findViewById(R.id.home);
home.setOnClickListener(this);
mRowId = Long.parseLong(getIntent().getStringExtra("id"));
mRowId = (savedInstanceState==null) ? null:
(Long)savedInstanceState.getSerializable(MyProfileDb.KEY_ROWID);
if(mRowId == null)
{
Bundle Extras = getIntent().getExtras();
mRowId = Extras != null ? Extras.getLong(MyProfileDb.KEY_ROWID): null;
}
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.profilecancel:
mDbHelper.close();
startActivity(new Intent(this, MyProfile.class));
finish();
break;
case R.id.profilesave:
saveState();
mDbHelper.close();
startActivity(new Intent(this, MyProfile.class));
break;
case R.id.homeInEditProfile:
case R.id.home:
mDbHelper.close();
startActivity(new Intent(this, Menu.class));
break;
}
}
private void saveState()
{
String allergies = mAllergiesText.getText().toString();
String conditions = mConditionsText.getText().toString();
String bloodgroup = mBloodText.getText().toString();
String note = mNoteText.getText().toString();
if (mRowId == null)
{
System.out.println("ROW"+ mRowId);
long id = mDbHelper.createdetails(allergies, conditions, bloodgroup, note);
if (id > 0)
{
System.out.println("ROW"+ id);
mRowId = id;
}
}
else
{
mDbHelper.updatedetails(mRowId, allergies, conditions, bloodgroup, note);
}
}
@Override
public final boolean onKeyDown(int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
if (KeyEvent.KEYCODE_BACK == keyCode)
{
startActivity(new Intent(this, Menu.class));
finish();
onDestroy();
}
return super.onKeyDown(keyCode, event);
}
}
System.out.println（「id is」+ mRowId）;這行打印什麼？ –
首先檢查現有的帖子，這裏是一個int的解決方案，將其改爲浮動，你會很好http://stackoverflow.com/questions/7074097/how-to-pass-integer-from-one-activity-to - 另一個 – Xavjer
你在mRowId中分配了什麼值？我想在populateFields函數中你必須分配this.mRowId = mRowId。 –