我有两个活动Activity A和ActivityB。活动A中有两个按钮，创建和编辑，活动B中有三个片段，带有edittext和textviews和一个下一个按钮。
活动A功能： 当用户单击“编辑”按钮时，它会故意发送一个“ id”；当用户单击“创建”按钮时，它将发送“ -1”的ID。
活动B功能： 片段事务通过getSupportFragmentManager（）完成。当收到id> 0时，它将从数据库中获取数据并在所有三个片段中显示它，否则将不会获取任何内容。
在单击“编辑”按钮时，所有先前的数据都将恢复，如果我按“后退”按钮，则将事务提交给片段B后。重新创建活动A并完成活动B。
问题是，如果现在单击创建按钮，则所有片段中的旧数据都将恢复。
活动A：-
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_section_home);
// if (savedInstanceState != null) {
// return;
// }
AppViewModel appViewModel = ViewModelProviders.of(this).get(AppViewModel.class);
projId = getIntent().getIntExtra(Utils.PROJECT_ID, -1);
projName = getIntent().getStringExtra(Utils.PROJECT_NAME);
projNameFull = getIntent().getStringExtra(Utils.PROJECT_NAME_FULL);
Toolbar toolbar = findViewById(R.id.toolbar);
toolbar.setTitle(projName);
setSupportActionBar(toolbar);
Button btnCreateSec = findViewById(R.id.btnCreateSec);
RecyclerView rvSectionList = findViewById(R.id.rvSectionList);
final secListAdapter mAdapter = new secListAdapter();
rvSectionList.setAdapter(mAdapter);
if (projId>0) {
appViewModel.fetchSections(projId).observe(this, new Observer<List<SectionInfoEntity>>() {
@Override
public void onChanged(List<SectionInfoEntity> sectionInfoEntities) {
sectionInfoEntityList = sectionInfoEntities;
mAdapter.setList(sectionInfoEntities);
}
});
}
btnCreateSec.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(SectionHome.this, SectionCreate.class);
startActivity(i);
overridePendingTransition(R.anim.enter_from_right, R.anim.exit_to_left);
finish();
}
});
btnEditSec.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(SectionHome.this, SectionCreate.class);
i.putExtra(Utils.SECTION_ID,sec_list.getId());
startActivity(i);
overridePendingTransition(R.anim.enter_from_right, R.anim.exit_to_left);
finish();
}
});
}
活动B
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_section_create);
secId = getIntent().getIntExtra(Utils.SECTION_ID,-1);
if (secId != -1){
sectionInfoEntity = appViewModel.fetchSectionById(secId);
}
else{
sectionInfoEntity = new SectionInfoEntity();
}
Button btnNext = findViewById(R.id.btnNext);
Button btnBack = findViewById(R.id.btnBack);
btnNext.setOnClickListener(this);
btnBack.setOnClickListener(this);
manager = getSupportFragmentManager();
Fragment a = manager.findFragmentByTag(fragSecCreateTag);
manager.beginTransaction().add(R.id.flContainer, fragSecCreate,fragSecCreateTag).commit();
}
@Override
public void onClick(View v) {
switch (v.getId()){
case R.id.btnNext:
if (manager.findFragmentByTag(fragSecCreateTag) instanceof SecCreateFragment) {
SecCreateFragment f = (SecCreateFragment) manager.findFragmentByTag(fragSecCreateTag);
if (f != null) {
if (f.checkData()) {
manager.beginTransaction().
setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_left).
replace(R.id.flContainer, fragSecDetail, fragSecDetailTag).
commit();
}
}
}
else if (manager.findFragmentByTag(fragSecDetailTag) instanceof SecDetailFragment){
SecDetailFragment f = (SecDetailFragment) manager.findFragmentByTag(fragSecDetailTag);
if (f != null) {
if (f.checkData()) {
manager.beginTransaction().
setCustomAnimations(R.anim.enter_from_right, R.anim.exit_to_left).
replace(R.id.flContainer, fragSecDetailSummary,fragSecDetailSummaryTag).
commit();
}
}
}
else if (manager.findFragmentByTag(fragSecDetailSummaryTag) instanceof SecDetailSummaryFragment){
int SectionId;
if (secId != -1)
{
appViewModel.updateSection(sectionInfoEntity);
SectionId = secId;
}
else {
SectionId = (int) appViewModel.addSection(sectionInfoEntity);
}
Intent i = new Intent(SectionCreate.this, SectionSurvey.class);
i.putExtra(Utils.PROJECT_ID,projId);
i.putExtra(Utils.PROJECT_NAME_FULL,projNameFull);
i.putExtra(Utils.SECTION_ID, SectionId);
i.putExtra(Utils.SECTION_NAME,secName);
i.putExtra(Utils.SECTION_TYPE,secType);
i.putExtra(Utils.SECTION_LENGTH,secLen);
i.putExtra(Utils.SECTION_MILESTONE,secKm);
startActivity(i);
overridePendingTransition(R.anim.enter_from_right, R.anim.exit_to_left);
finish();
}
manager.executePendingTransactions();
break;
case R.id.btnBack:
if (manager.findFragmentByTag(fragSecDetailSummaryTag) instanceof SecDetailSummaryFragment){
manager.beginTransaction().
setCustomAnimations(R.anim.enter_from_left, R.anim.exit_to_right).
replace(R.id.flContainer, fragSecDetail,fragSecDetailTag).
commit();
}
else if (manager.findFragmentByTag(fragSecDetailTag) instanceof SecDetailFragment){
manager.beginTransaction().
setCustomAnimations(R.anim.enter_from_left, R.anim.exit_to_right).
replace(R.id.flContainer, fragSecCreate,fragSecCreateTag).
commit();
}
else if (manager.findFragmentByTag(fragSecCreateTag) instanceof SecCreateFragment){
Intent i = new Intent(SectionCreate.this, SectionHome.class);
i.putExtra(Utils.PROJECT_ID, projId);
i.putExtra(Utils.PROJECT_NAME,projName);
startActivity(i);
overridePendingTransition(R.anim.enter_from_left, R.anim.exit_to_right);
finish();
}
manager.executePendingTransactions();
break;
}
}
片段1和2
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final View v = inflater.inflate(R.layout.frag_sec_create, container, false);
etSecName = v.findViewById(R.id.etSecName);
RadioGroup rgSecStruct = v.findViewById(R.id.rgSecStruct);
RadioButton rb = v.findViewById(R.id.rbDivided);
RadioButton rb1 = v.findViewById(R.id.rbUndivided);
if (secId!=-1 && !secName.equals("")){
etSecName.setText(secName);
etSecName.setEnabled(false);
secDate = sec_Date;
SectionInfoEntity sectionInfoEntityEdit = SectionCreate.sectionInfoEntity;
SecStruc = sectionInfoEntityEdit.getSstructure();
SecType = sectionInfoEntityEdit.getStype();
if (SecStruc.equals(rb1.getText().toString())){
rb1.setChecked(true);
for(int i =0; i< SectionTypeUndividedList.size(); i ++){
if (SecType.equals(SectionTypeUndividedList.get(i).getType())){
row_index = i;
break;
}
}
}
else {
rb.setChecked(true);
for(int i =0; i< SectionTypeDividedList.size(); i ++){
if (SecType.equals(SectionTypeDividedList.get(i).getType())){
row_index = i;
break;
}
}
}
rb.setEnabled(false);
rb1.setEnabled(false);
}
else {
rb.setChecked(true);
SecStruc = rb.getText().toString();
}
return v;
}