我想在我的 android 应用程序中创建一个多步骤注册表单。我希望使用 viewpager有多个 fragments每个 fragment作为注册的一个步骤。
最后，我想使用一个 Activity 将每个 fragment 中提交的所有数据提交到 mysql数据库。我可以为此获得一个小示例代码吗？
这是我到目前为止所尝试的。我能够实现具有多个 fragment 的 viewpager。我在 StepOne.java fragment 中创建了一个接口(interface)，以便与 Activity 进行通信。但我无法从这些 fragment 中检索数据。它在第 52 行抛出一个空指针异常。
这是我的代码:
SliderActivity.java:
public class SliderActivity extends AppCompatActivity {
ViewPager viewPager;
EditText edName,edPassword, edConfPass;
TextView tvShowAll;
ViewPagerAdapter mPagerAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_slider);
viewPager = findViewById(R.id.view_pager);
mPagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(mPagerAdapter);
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
@Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
}
@Override
public void onPageScrollStateChanged(int state) {
}
});
}
public void selectIndex(int newIndex) {
viewPager.setCurrentItem(newIndex);
}
@Override
public void onBackPressed() {
int currentPosition = viewPager.getCurrentItem();
if (currentPosition != 0) {
viewPager.setCurrentItem(viewPager.getCurrentItem()-1);
} else {
super.onBackPressed();
}
}
public class ViewPagerAdapter extends FragmentPagerAdapter {
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch (position)
{
case 0:
return new StepOne();
case 1:
return new StepTwo();
case 2:
return new StepThree();
}
return null;
}
@Override
public int getCount() {
return 3; //three fragments
}
}
}
StepOne.java:
public class StepOne extends Fragment {
Button buttonInFragment1;
EditText edName;
public interface ActivityFragmentCallback {
void onSetName(String name);
}
ActivityFragmentCallback listener;
public StepOne() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View rootView = inflater.inflate(R.layout.fragment_step_one, container, false);
edName = rootView.findViewById(R.id.edName);
buttonInFragment1 = rootView.findViewById(R.id.button_one);
if(buttonInFragment1 != null) {
buttonInFragment1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Toast.makeText(getContext(),edName.getText().toString(),Toast.LENGTH_SHORT).show();
if(edName != null) {
listener.onSetName(edName.getText().toString());
}
switch (view.getId()){
case R.id.button_one:
((SliderActivity)getActivity()).selectIndex(1);
break;
}
}
});
}
return rootView;
}
@Override
public void onAttach(Context context){
super.onAttach(context);
try {
listener = (ActivityFragmentCallback)context;
}catch (ClassCastException c){
c.printStackTrace();
}
}
}
MessageActivity.java:这里是我需要从所有 fragment 提交的所有数据的地方
public class MessageActivity extends AppCompatActivity implements StepOne.ActivityFragmentCallback {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message);
}
@Override
public void onSetName(String name){
// tvShowAll = findViewById(R.id.tvShowAll);
// tvShowAll.setText(name);
Toast.makeText(getApplicationContext(),name, Toast.LENGTH_LONG).show();
}
}
最佳答案
以下是逐步注册的一些引用链接；
希望你有帮助
https://github.com/stepstone-tech/android-material-stepper
https://github.com/baoyachi/StepView?utm_source=android-arsenal.com&utm_medium=referral&utm_campaign=3774
关于android - 如何使用 viewpager 和多个 fragment 创建多步骤注册表单？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57139901/