android意图片段到活动有错误
Posted
技术标签:
【中文标题】android意图片段到活动有错误【英文标题】：Have error with android intent fragment to activity 【发布时间】：2021-02-05 03:20:16 【问题描述】：*帮助我找出错误的原因。 我做了 onClick mButtonDate 我的清单中有问题。 我需要向您展示哪些文件以便您了解我的问题？ 我试图更改清单，关闭 InstantRun，重建项目，谷歌搜索问题。 *
public class CrimeFragment extends Fragment
private static final String ARG_CRIME_ID = "crime_id";
private static final String DATE_DIALOG = "DialogDate";
private static final String TIME_DIALOG = "DialogTime";
public static final String TIME_FORMAT = "hh:mm: a z";
private static final int REQUEST_DATE = 0;
private static final int REQUEST_TIME = 1;
private Crime mCrime;
private EditText mTitleField;
private Button mButtonDate;
private Button mButtonTime;
private CheckBox mCheckSolvedBox;
private Button firstButton;
private Button lastButton;
private boolean mIsLargeLayout;
private Callbacks mCallbacks;
public interface Callbacks
void onCrimeUpdate(Crime crime);
public static CrimeFragment newInstanse(UUID crimeId)
Bundle args = new Bundle();
args.putSerializable(ARG_CRIME_ID, crimeId);
CrimeFragment fragment = new CrimeFragment();
fragment.setArguments(args);
return fragment;
@Override
public void onAttach(@NonNull Context context)
super.onAttach(context);
mCallbacks = (Callbacks) context;
@Override
public void onCreate(@Nullable Bundle savedInstanceState)
super.onCreate(savedInstanceState);
mIsLargeLayout = getResources().getBoolean(R.bool.large_layout);
UUID crimeId = (UUID) getArguments().getSerializable(ARG_CRIME_ID);
mCrime = CrimeLab.get(getActivity()).getCrime(crimeId);
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
View v = inflater.inflate(R.layout.fragment_crime, container, false);
firstButton = v.findViewById(R.id.firstButton);
lastButton = v.findViewById(R.id.lastButton);
mCheckSolvedBox = (CheckBox) v.findViewById(R.id.crime_solved);
mCheckSolvedBox.setChecked(mCrime.isSolved());
mCheckSolvedBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener()
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
mCrime.setSolved(isChecked);
updateCrime();
);
mButtonTime = (Button) v.findViewById(R.id.crime_time);
updateTime();
mButtonTime.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
if (mIsLargeLayout)
FragmentManager fragment = getFragmentManager();
TimePickerFragment dialog = TimePickerFragment.newInstance(mCrime.getTime());
dialog.setTargetFragment(CrimeFragment.this, REQUEST_TIME);
dialog.show(fragment, TIME_DIALOG);
else
Intent intent = TimePickerActivity.newIntent(getContext(), mCrime.getTime());
startActivityForResult(intent, REQUEST_TIME);
);
mButtonDate = (Button) v.findViewById(R.id.crime_date);
updateDate();
mButtonDate.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
if (mIsLargeLayout)
FragmentManager fragmentManager = getFragmentManager();
DatePickerFragment dialog = new DatePickerFragment().newInstance(mCrime.getDate());
dialog.setTargetFragment(CrimeFragment.this, REQUEST_DATE);
dialog.show(fragmentManager, DATE_DIALOG);
else
Intent intent = DatePickerActivity.newIntent(getContext(), mCrime.getDate());
startActivityForResult(intent, REQUEST_DATE);
);
mTitleField = (EditText) v.findViewById(R.id.crime_title);
mTitleField.setText(mCrime.getTitle());
mTitleField.addTextChangedListener(new TextWatcher()
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after)
@Override
public void onTextChanged(CharSequence s, int start, int before, int count)
mCrime.setTitle(s.toString());
updateCrime();
@Override
public void afterTextChanged(Editable s)
);
firstButton.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
((CrimePagerActivity) getActivity()).goToFistPage();
);
lastButton.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
((CrimePagerActivity) getActivity()).goToLastPage();
);
return v;
@Override
public void onActivityResult(int requestCode, int resultCode, @Nullable Intent data)
if (resultCode != Activity.RESULT_OK)
return;
if (requestCode == REQUEST_DATE)
Date date = (Date) data.getSerializableExtra(DatePickerFragment.EXTRA_DATE);
mCrime.setDate(date);
updateDate();
updateCrime();
if (requestCode == REQUEST_TIME)
Date time = (Date) data.getSerializableExtra(TimePickerFragment.EXTRA_TIME);
mCrime.setTime(time);
updateTime();
updateCrime();
private void updateCrime()
mCallbacks.onCrimeUpdate(mCrime);
private void updateDate()
mButtonDate.setText(mCrime.getDate().toString());
private void updateTime()
DateFormat timeFormat = new SimpleDateFormat(TIME_FORMAT);
mButtonTime.setText(timeFormat.format(mCrime.getTime()));
@Override
public void onDetach()
super.onDetach();
mCallbacks = null;
startActivityForResult 中的错误（意图，REQUEST_DATE）； ：
mButtonDate = (Button) v.findViewById(R.id.crime_date);
updateDate();
mButtonDate.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
if (mIsLargeLayout)
FragmentManager fragmentManager = getFragmentManager();
DatePickerFragment dialog = new DatePickerFragment().newInstance(mCrime.getDate());
dialog.setTargetFragment(CrimeFragment.this, REQUEST_DATE);
dialog.show(fragmentManager, DATE_DIALOG);
else
Intent intent = DatePickerActivity.newIntent(getContext(), mCrime.getDate());
startActivityForResult(intent, REQUEST_DATE);
);
错误：
2020-10-21 23:03:59.853 18523-18523/com.example.criminalintent E/androidRuntime: FATAL EXCEPTION: main
Process: com.example.criminalintent, PID: 18523
android.content.ActivityNotFoundException: Unable to find explicit activity class com.example.criminalintent/com.example.criminalintent.DatePickerFragment; have you declared this activity in your AndroidManifest.xml?
at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1932)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1615)
at android.app.Activity.startActivityForResult(Activity.java:4472)
at androidx.fragment.app.FragmentActivity.startActivityForResult(FragmentActivity.java:676)
at androidx.core.app.ActivityCompat.startActivityForResult(ActivityCompat.java:234)
at androidx.fragment.app.FragmentActivity.startActivityFromFragment(FragmentActivity.java:796)
at androidx.fragment.app.FragmentActivity$HostCallbacks.onStartActivityFromFragment(FragmentActivity.java:933)
at androidx.fragment.app.Fragment.startActivityForResult(Fragment.java:1206)
at androidx.fragment.app.Fragment.startActivityForResult(Fragment.java:1194)
at com.example.criminalintent.CrimeFragment$3.onClick(CrimeFragment.java:128)
at android.view.View.performClick(View.java:6256)
at android.view.View$PerformClick.run(View.java:24701)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
我的清单：
<?xml version="1.0" encoding="utf-8"?>
<manifest
xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.criminalintent">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".CrimeListActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity android:name=".CrimePagerActivity">
</activity>
</application>
</manifest>
日期选择器片段：
public class DatePickerFragment extends DialogFragment
private static final String ARG_DATE = "Date";
public static final String EXTRA_DATE = "com.example.criminalintent.date";
private DatePicker mDatePicker;
private Button mDatePickerOkButton;
public static DatePickerFragment newInstance(Date date)
Bundle args = new Bundle();
args.putSerializable(ARG_DATE, date);
DatePickerFragment fragment = new DatePickerFragment();
fragment.setArguments(args);
return fragment;
@NonNull
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState)
Date date = (Date) getArguments().getSerializable(ARG_DATE);
View v = inflater.inflate(R.layout.dialog_date, container, false);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int year = calendar.get(Calendar.YEAR);
int month = calendar.get(Calendar.MONTH);
int day = calendar.get(Calendar.DAY_OF_MONTH);
mDatePicker = (DatePicker) v.findViewById(R.id.dialog_date_picker);
mDatePicker.init(year, month, day, null);
mDatePickerOkButton = (Button) v.findViewById(R.id.dialog_date_ok_button);
mDatePickerOkButton.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
int year = mDatePicker.getYear();
int month = mDatePicker.getMonth();
int day = mDatePicker.getDayOfMonth();
Date date = new GregorianCalendar(year, month, day).getTime();
sendResult(Activity.RESULT_OK, date);
);
return v;
private void sendResult(int resultCode, Date date)
Intent data = new Intent();
data.putExtra(EXTRA_DATE, date);
if (getTargetFragment() == null)
Activity hostingActivity = getActivity();
hostingActivity.setResult(resultCode, data);
hostingActivity.finish();
else
dismiss();
getTargetFragment().onActivityResult(getTargetRequestCode(), resultCode, data);
日期选择器活动：
public class DatePickerActivity extends SingleFragmentActivity
private static final String EXTRA_CRIME_DATE = "com.example.criminalintent.crime_date";
public static Intent newIntent(Context packageContext, Date date)
Intent intent = new Intent(packageContext, DatePickerActivity.class);
intent.putExtra(EXTRA_CRIME_DATE, date);
return intent;
@Override
protected Fragment createFragment()
Date date = (Date) getIntent().getSerializableExtra(EXTRA_CRIME_DATE);
return DatePickerFragment.newInstance(date);
CrimeListAcrivity
public class CrimeListActivity extends SingleFragmentActivity implements CrimeListFragment.Callbacks, CrimeFragment.Callbacks
@Override
protected Fragment createFragment()
return new CrimeListFragment();
@Override
protected int getLayoutResId()
return R.layout.activity_masterdetail;
@Override
public void onCrimeSelected(Crime crime)
if (findViewById(R.id.detail_fragment_container) == null)
Intent intent = CrimePagerActivity.newIntent(this, crime.getId());
startActivity(intent);
else
Fragment newDetail = CrimeFragment.newInstanse(crime.getId());
getSupportFragmentManager().beginTransaction()
.replace(R.id.detail_fragment_container, newDetail)
.commit();
@Override
public void onCrimeUpdate(Crime crime)
CrimeListFragment listFragment = (CrimeListFragment)getSupportFragmentManager()
.findFragmentById(R.id.fragment_container);
listFragment.updateUI();
CrimePagerActivity
public class CrimePagerActivity extends AppCompatActivity implements CrimeFragment.Callbacks
private ViewPager mViewPager;
private List<Crime> mCrimes;
private static final String EXTRA_CRIME_ID = "com.example.criminalintent.crime_id";
public static Intent newIntent(Context packageContext, UUID crimeId)
Intent intent = new Intent(packageContext, CrimePagerActivity.class);
intent.putExtra(EXTRA_CRIME_ID, crimeId);
return intent;
public void goToFistPage()
mViewPager.setCurrentItem(0);
public void goToLastPage()
mViewPager.setCurrentItem(mCrimes.size());
@Override
protected void onCreate(@Nullable Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_crime_pager);
UUID crimeId = (UUID) getIntent().getSerializableExtra(EXTRA_CRIME_ID);
mViewPager = (ViewPager) findViewById(R.id.crime_view_pager);
mCrimes = CrimeLab.get(this).getCrimes();
FragmentManager fragmentManager = getSupportFragmentManager();
mViewPager.setAdapter(new FragmentStatePagerAdapter(fragmentManager)
@Override
public Fragment getItem(int position)
Crime crime = mCrimes.get(position);
return CrimeFragment.newInstanse(crime.getId());
@Override
public int getCount()
return mCrimes.size();
);
for (int i = 0; i < mCrimes.size(); i++)
if (mCrimes.get(i).getId().equals(crimeId))
mViewPager.setCurrentItem(i);
break;
@Override
public void onCrimeUpdate(Crime crime)
@Override
public void onCrimeSelected(Crime crime)
犯罪列表片段
public class CrimeListFragment extends Fragment
private RecyclerView mCrimeRecyclerView;
private CrimeAdapter mAdapter;
private Callbacks mCallbacks;
/**
* Required interface for hosting activities
*/
public interface Callbacks
void onCrimeSelected(Crime crime);
@Override
public void onAttach(@NonNull Context context)
super.onAttach(context);
mCallbacks = (Callbacks) context;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
View v = inflater.inflate(R.layout.fragment_crime_list, container, false);
mCrimeRecyclerView = (RecyclerView) v.findViewById(R.id.crime_recycler_view);
mCrimeRecyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
updateUI();
return v;
@Override
public void onResume()
super.onResume();
updateUI();
public void updateUI()
CrimeLab crimeLab = CrimeLab.get(getActivity());
List<Crime> crimes = crimeLab.getCrimes();
if (mAdapter == null)
mAdapter = new CrimeAdapter(crimes);
mCrimeRecyclerView.setAdapter(mAdapter);
else
for (int indexValue = 0; indexValue < crimes.size(); indexValue++)
mAdapter.notifyItemChanged(indexValue);
private class CrimeHolder extends RecyclerView.ViewHolder implements View.OnClickListener
private Crime mCrime;
private TextView mTitleTextView;
private TextView mDateTextView;
private ImageView mSolvedImageView;
public CrimeHolder(LayoutInflater inflater, ViewGroup parent)
super(inflater.inflate(R.layout.list_item_crime, parent, false));
itemView.setOnClickListener(this);
mTitleTextView = (TextView) itemView.findViewById(R.id.crime_title);
mDateTextView = (TextView) itemView.findViewById(R.id.crime_date);
mSolvedImageView = (ImageView) itemView.findViewById(R.id.crime_solved);
public void bind(Crime crime)
mCrime = crime;
mTitleTextView.setText(mCrime.getTitle());
mDateTextView.setText((String) DateFormat.format("EEEE, MMM dd, yyyy", mCrime.getDate()));
mSolvedImageView.setVisibility(crime.isSolved() ? View.VISIBLE : View.GONE);
@Override
public void onClick(View v)
mCallbacks.onCrimeSelected(mCrime);
private class CrimeAdapter extends RecyclerView.Adapter<CrimeHolder>
private List<Crime> mCrimes;
public CrimeAdapter(List<Crime> crimes)
mCrimes = crimes;
@Override
public CrimeHolder onCreateViewHolder(ViewGroup parent, int viewType)
LayoutInflater layoutInFlater = LayoutInflater.from(getActivity());
return new CrimeHolder(layoutInFlater, parent);
@Override
public void onBindViewHolder(CrimeHolder holder, int position)
Crime crime = mCrimes.get(position);
holder.bind(crime);
@Override
public int getItemCount()
return mCrimes.size();
@Override
public void onDetach()
super.onDetach();
mCallbacks = null;
SingleFragmentActivity
public abstract class SingleFragmentActivity extends AppCompatActivity
protected abstract Fragment createFragment();
@LayoutRes
protected int getLayoutResId()
return R.layout.activity_fragment;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(getLayoutResId());
FragmentManager fm = getSupportFragmentManager();
Fragment fragment = fm.findFragmentById(R.id.fragment_container);
if (fragment == null)
fragment = createFragment();
fm.beginTransaction()
.add(R.id.fragment_container, fragment)
.commit();
【问题讨论】：
那么，您是否尝试过将 DatePickerFragment 添加到清单中？ 不，因为我无法在清单中添加片段，但我添加了不同的活动，但什么也没发生。我看到了同样的问题。 github.com/Zblol/ThirdTrainingApp/tree/master/app/src/main/java/… 这是我的项目上的链接，也许有助于理解 【参考方案1】：mButtonDate.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
FragmentManager fragmentManager = getFragmentManager();
if (mIsLargeLayout)
DatePickerFragment dialog = new DatePickerFragment().newInstance(mCrime.getDate());
dialog.setTargetFragment(CrimeFragment.this, REQUEST_DATE);
dialog.show(fragmentManager, DATE_DIALOG);
else
final Dialog dialog_date = new Dialog(getContext());
dialog_date.setContentView(R.layout.dialog_date);
final DatePicker dialog_date_picker = dialog_date.findViewById(R.id.dialog_date_picker);
Button dialog_date_ok_button = dialog_date.findViewById(R.id.dialog_date_ok_button);
dialog_date_ok_button.setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View v)
dialog_date.dismiss();
Toast.makeText(getContext(), dialog_date_picker.getYear() + "", Toast.LENGTH_SHORT).show();
);
dialog_date.show();
);
【讨论】：
它可以工作，但日历打开就像活动中的对话框一样，但我需要完全像活动一样打开 (DatePikerActivity) 我已经编辑了我的答案以从对话框中返回结果，并且不需要 DatePickerFragment 谢谢，但是很抱歉，我在其他类中使用了这些方法，我在上面添加了它们。以上是关于android意图片段到活动有错误的主要内容，如果未能解决你的问题，请参考以下文章
设置onclick侦听器在android中无法从一个片段移动到另一个活动[重复]