Фрагмент не может быть приведен к android.app.activity

Question

Я знаю, что этот вопрос был задан раньше, но они не были в такой же ситуации я нахожусь.

Моя проблема, мне нужно, чтобы мой класс PostPhotosActivity retainInstance , То, как я это делаю, превращает его в фрагмент. К сожалению, я всегда получаю эту ошибку.

12-13 14:38:55.669: E/AndroidRuntime(30234): FATAL EXCEPTION: main 

12-13 14:38:55.669: E/AndroidRuntime(30234): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{trade.ly.tradely/trade.ly.tradely.PostPhotosActivity}: java.lang.ClassCastException: trade.ly.tradely.PostPhotosActivity cannot be cast to android.app.Activity 

12-13 14:38:55.669: E/AndroidRuntime(30234): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106) 

12-13 14:38:55.669: E/AndroidRuntime(30234): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 

12-13 14:38:55.669: E/AndroidRuntime(30234): at android.app.ActivityThread.access$600(ActivityThread.java:141) 

12-13 14:38:55.669: E/AndroidRuntime(30234): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 

12-13 14:38:55.669: E/AndroidRuntime(30234): at android.os.Handler.dispatchMessage(Handler.java:99) 

12-13 14:38:55.669: E/AndroidRuntime(30234): at android.os.Looper.loop(Looper.java:137) 

12-13 14:38:55.669: E/AndroidRuntime(30234): at android.app.ActivityThread.main(ActivityThread.java:5039) 

12-13 14:38:55.669: E/AndroidRuntime(30234): at java.lang.reflect.Method.invokeNative(Native Method) 

12-13 14:38:55.669: E/AndroidRuntime(30234): at java.lang.reflect.Method.invoke(Method.java:511) 

12-13 14:38:55.669: E/AndroidRuntime(30234): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 

12-13 14:38:55.669: E/AndroidRuntime(30234): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 

12-13 14:38:55.669: E/AndroidRuntime(30234): at dalvik.system.NativeStart.main(Native Method) 

12-13 14:38:55.669: E/AndroidRuntime(30234): Caused by: java.lang.ClassCastException: trade.ly.tradely.PostPhotosActivity cannot be cast to android.app.Activity 

12-13 14:38:55.669: E/AndroidRuntime(30234): at android.app.Instrumentation.newActivity(Instrumentation.java:1054) 

12-13 14:38:55.669: E/AndroidRuntime(30234): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097) 

12-13 14:38:55.669: E/AndroidRuntime(30234): ... 11 more 

Это PostPhotosActivity, которая производит все ошибки.

public class PostPhotosActivity extends android.app.Fragment { 

public static final String TAG = "PostPhotosActivity"; 

String title, price, description, maincat, subcat, pname, pemail, pphone, pmeet, imageUri; 

public static final String TEMP_PHOTO_FILE_NAME = "temp_photo.jpg"; 

public static final int REQUEST_CODE_GALLERY  = 0x1; 
public static final int REQUEST_CODE_TAKE_PICTURE = 0x2; 
public static final int REQUEST_CODE_CROP_IMAGE = 0x3; 
private ImageView mImageView; 
private File  mFileTemp; 
ParseFile file; 
double latitude; 
final String[] items = new String[] { "Take from camera", "Select from gallery" }; 

double longitude; 
Button button; 



@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, 
     Bundle savedInstanceState) { 


    View view = inflater.inflate(R.layout.activity_post_photos, container,false); 


    Bundle extras= getActivity().getIntent().getExtras(); 
    if(extras!=null) 
    { 
     title = extras.getString("TITLE"); // get the value based on the key 
     price = extras.getString("PRICE"); // get the value based on the key 
     description = extras.getString("DESCRIPTION"); // get the value based on the key 
     maincat = extras.getString("MAINCAT"); // get the value based on the key 
     subcat = extras.getString("SUBCAT"); // get the value based on the key 
     pname = extras.getString("PNAME"); // get the value based on the key 
     pemail = extras.getString("PEMAIL"); // get the value based on the key 
     pphone = extras.getString("PPHONE"); // get the value based on the key 
     pmeet = extras.getString("PMEET"); // get the value based on the key 
     latitude = extras.getDouble("lat"); 
     longitude = extras.getDouble("long"); 
    } 



Button newPost = (Button)view.findViewById(R.id.post_data); 
newPost.setVisibility(View.INVISIBLE); 

newPost.setOnClickListener(new View.OnClickListener() { 
    public void onClick(View v) { 
     // Perform action on click 

     ParseGeoPoint point = new ParseGeoPoint(latitude, longitude); 
     ParseObject setPost = new ParseObject("Posts"); 

     // Create an author relationship with the current user 
     setPost.put("author", ParseUser.getCurrentUser()); 

     // Get location 

     setPost.put("location", point); 
     setPost.put("Title", title); 
     setPost.put("Price", price); 
     setPost.put("Description", description); 
     setPost.put("MainCat", maincat); 
     setPost.put("SubCat", subcat); 
     setPost.put("PName", pname); 
     setPost.put("PEmail", pemail); 
     setPost.put("PPhone", pphone); 
     setPost.put("PMeet", pmeet); 
     setPost.put("Photo", file); 

     setPost.saveInBackground(); 

     Intent intent = new Intent(getActivity(), Flow.class); 
     startActivity(intent); 
    } 
}); 



    ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), android.R.layout.select_dialog_item, items); 
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity()); 

    builder.setTitle("Select Image"); 
    builder.setAdapter(adapter, new DialogInterface.OnClickListener() { 
     public void onClick(DialogInterface dialog, int item) { // pick from 
                   // camera 
      if (item == 0) { 

       takePicture(); 

      } else { // pick from file 

       openGallery(); 

      } 
     } 
    }); 

    final AlertDialog dialog = builder.create(); 

    mImageView = (ImageView) view.findViewById(R.id.iv_photo); 
    mImageView.setOnClickListener(new OnClickListener() { 
     public void onClick(View v) { 

      dialog.show(); 
     } 
    }); 



     String state = Environment.getExternalStorageState(); 
     if (Environment.MEDIA_MOUNTED.equals(state)) { 
       mFileTemp = new File(Environment.getExternalStorageDirectory(), TEMP_PHOTO_FILE_NAME); 
     } 
     else { 
       mFileTemp = new File(getActivity().getFilesDir(), TEMP_PHOTO_FILE_NAME); 
     } 
     setRetainInstance(true); 
     return view; 

} 

private void takePicture() { 

    Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); 

    try { 
      Uri mImageCaptureUri = null; 
      String state = Environment.getExternalStorageState(); 
      if (Environment.MEDIA_MOUNTED.equals(state)) { 
        mImageCaptureUri = Uri.fromFile(mFileTemp); 
      } 
      else { 
        /* 
        * The solution is taken from here: http://stackoverflow.com/questions/10042695/how-to-get-camera-result-as-a-uri-in-data-folder 
        */ 
        mImageCaptureUri = InternalStorageContentProvider.CONTENT_URI; 
      }   
     intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, mImageCaptureUri); 
     intent.putExtra("return-data", true); 
     startActivityForResult(intent, REQUEST_CODE_TAKE_PICTURE); 
    } catch (ActivityNotFoundException e) { 

     Log.d(TAG, "cannot take picture", e); 
    } 
} 

private void openGallery() { 

    Intent photoPickerIntent = new Intent(Intent.ACTION_PICK); 
    photoPickerIntent.setType("image/*"); 
    startActivityForResult(photoPickerIntent, REQUEST_CODE_GALLERY); 
} 

private void startCropImage() { 

    Intent intent = new Intent(getActivity(), CropImage.class); 
    intent.putExtra(CropImage.IMAGE_PATH, mFileTemp.getPath()); 
    intent.putExtra(CropImage.SCALE, true); 

    intent.putExtra(CropImage.ASPECT_X, 1); 
    intent.putExtra(CropImage.ASPECT_Y, 1); 

    startActivityForResult(intent, REQUEST_CODE_CROP_IMAGE); 
} 

@Override 
public void onActivityResult(int requestCode, int resultCode, Intent data) { 

    if (resultCode != Activity.RESULT_OK) { 

     return; 
    } 

    Bitmap bitmap; 

    switch (requestCode) { 

     case REQUEST_CODE_GALLERY: 

      try { 

       InputStream inputStream = getActivity().getContentResolver().openInputStream(data.getData()); 
       FileOutputStream fileOutputStream = new FileOutputStream(mFileTemp); 
       copyStream(inputStream, fileOutputStream); 
       fileOutputStream.close(); 
       inputStream.close(); 

       startCropImage(); 

      } catch (Exception e) { 

       Log.e(TAG, "Error while creating temp file", e); 
      } 

      break; 
     case REQUEST_CODE_TAKE_PICTURE: 

      startCropImage(); 
      break; 
     case REQUEST_CODE_CROP_IMAGE: 

      String path = data.getStringExtra(CropImage.IMAGE_PATH); 
      if (path == null) { 

       return; 
      } 

      //byte[] idata = path.getBytes(); 
      Bitmap picture = BitmapFactory.decodeFile(path); 
      ByteArrayOutputStream stream = new ByteArrayOutputStream(); 
      picture.compress(Bitmap.CompressFormat.JPEG, 100, stream); 
      // get byte array here 
      byte[] idata= stream.toByteArray(); 

      file = new ParseFile("photo.jpg", idata); 
      file.saveInBackground(); 

      bitmap = BitmapFactory.decodeFile(mFileTemp.getPath()); 

      mImageView.setImageBitmap(bitmap); 
      button.setVisibility(View.VISIBLE); 
      break; 
    } 
    super.onActivityResult(requestCode, resultCode, data); 
} 





public static void copyStream(InputStream input, OutputStream output) 
     throws IOException { 

    byte[] buffer = new byte[1024]; 
    int bytesRead; 
    while ((bytesRead = input.read(buffer)) != -1) { 
     output.write(buffer, 0, bytesRead); 
    } 
} 

} 

Manifest

<activity 
     android:name="trade.ly.tradely.PostPhotosActivity" 
     android:label="@string/title_activity_post_photos"> 
    </activity> 

Класс активности, где фрагмент создается OnClick

public class PostActivity extends FragmentActivity implements 
PageFragmentCallbacks, ReviewFragment.Callbacks, ModelCallbacks { 
    private ViewPager mPager; 
    private MyPagerAdapter mPagerAdapter; 

    private boolean mEditingAfterReview; 

    private AbstractWizardModel mWizardModel = new SandwichWizardModel(this); 

    private boolean mConsumePageSelectedEvent; 

    private Button mNextButton; 
    private Button mPrevButton; 
    String user_name; 
    String uemail; 

    private List<Page> mCurrentPageSequence; 
    private StepPagerStrip mStepPagerStrip; 

    public static final String TAG = "PostActivity"; 
    double latitude, longitude; 

    public void onCreate(Bundle savedInstanceState) { 


     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_post); 

     Bundle extras = getIntent().getExtras(); 
     if(extras !=null) { 
     // Get the results 
     user_name = extras.getString("name"); 
     uemail = extras.getString("email"); 
     } 

     Bundle data = new Bundle(); 
     if (!TextUtils.isEmpty(CustomerInfoPage.EMAIL_DATA_KEY)) { 
      data.putString(CustomerInfoPage.EMAIL_DATA_KEY, uemail); 
      mWizardModel.findByKey("Your Info").resetData(data); 
    } 

     GpsLocationTracker mGpsLocationTracker = new GpsLocationTracker(PostActivity.this); 


     // Set GPS Location fetched address 

     if (mGpsLocationTracker.canGetLocation()) 
     { 
      latitude = mGpsLocationTracker.getLatitude(); 
      longitude = mGpsLocationTracker.getLongitude(); 
      Log.i(TAG, String.format("latitude: %s", latitude)); 
      Log.i(TAG, String.format("longitude: %s", longitude)); 

     } 
     else 
     { 
      mGpsLocationTracker.showSettingsAlert(); 
     } 

     if (savedInstanceState != null) { 
      mWizardModel.load(savedInstanceState.getBundle("model")); 
     } 

     mWizardModel.registerListener(this); 

     mPagerAdapter = new MyPagerAdapter(getSupportFragmentManager()); 
     mPager = (ViewPager) findViewById(R.id.pager); 
     mPager.setAdapter(mPagerAdapter); 
     mStepPagerStrip = (StepPagerStrip) findViewById(R.id.strip); 
     mStepPagerStrip.setOnPageSelectedListener(new StepPagerStrip.OnPageSelectedListener() { 
      @Override 
      public void onPageStripSelected(int position) { 
       position = Math.min(mPagerAdapter.getCount() - 1, position); 
       if (mPager.getCurrentItem() != position) { 
        mPager.setCurrentItem(position); 
       } 
      } 
     }); 

     mNextButton = (Button) findViewById(R.id.next_button); 
     mPrevButton = (Button) findViewById(R.id.prev_button); 

     mPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { 
      @Override 
      public void onPageSelected(int position) { 
       mStepPagerStrip.setCurrentPage(position); 

       if (mConsumePageSelectedEvent) { 
        mConsumePageSelectedEvent = false; 
        return; 
       } 

       mEditingAfterReview = false; 
       updateBottomBar(); 
      } 
     }); 

     mNextButton.setOnClickListener(new View.OnClickListener() { 
      @SuppressLint("ValidFragment") 
      @Override 
      public void onClick(View view) { 

       if (mPager.getCurrentItem() == mCurrentPageSequence.size()) { 


        DialogFragment dg = new DialogFragment() { 
         @Override 
         public Dialog onCreateDialog(Bundle savedInstanceState) { 
          return new AlertDialog.Builder(getActivity()) 
            .setMessage(R.string.submit_confirm_message) 
            .setPositiveButton(
              R.string.submit_confirm_button, 
              new DialogInterface.OnClickListener() { 
               public void onClick(
                 DialogInterface dialog, 
                 int id) { 

                String title = mWizardModel 
                  .findByKey(
                    "Post Info") 
                  .getData() 
                  .getString(
                    TpdModel.TITLE_DATA_KEY); 

                String price = mWizardModel 
                  .findByKey(
                    "Post Info") 
                  .getData() 
                  .getString(
                    TpdModel.PRICE_DATA_KEY); 

                String description = mWizardModel 
                  .findByKey(
                    "Post Info") 
                  .getData() 
                  .getString(
                    TpdModel.DESCRIPTION_DATA_KEY); 

                String maincat = mWizardModel 
                  .findByKey(
                    "Main Category") 
                  .getData() 
                  .getString(
                    Page.SIMPLE_DATA_KEY); 

                String subcat = mWizardModel 
                  .findByKey(
                    "Sub Category") 
                  .getData() 
                  .getString(
                    Page.SIMPLE_DATA_KEY); 

                String pname = mWizardModel 
                  .findByKey(
                    "Your Info") 
                  .getData() 
                  .getString(
                    CustomerInfoPage.NAME_DATA_KEY); 

                String pemail = mWizardModel 
                  .findByKey(
                    "Your Info") 
                  .getData() 
                  .getString(
                    CustomerInfoPage.EMAIL_DATA_KEY); 

                String pphone = mWizardModel 
                  .findByKey(
                    "Your Info") 
                  .getData() 
                  .getString(
                    CustomerInfoPage.PHONE_DATA_KEY); 

                String pmeet = mWizardModel 
                  .findByKey(
                    "Your Info") 
                  .getData() 
                  .getString(
                    CustomerInfoPage.MEET_DATA_KEY); 

                Intent i = new Intent(
                  PostActivity.this, 
                  PostPhotosActivity.class); 
                i.putExtra("TITLE", title); 
                i.putExtra("PRICE", price); 
                i.putExtra("DESCRIPTION", 
                  description); 
                i.putExtra("MAINCAT", 
                  maincat); 
                i.putExtra("SUBCAT", subcat); 
                i.putExtra("PNAME", pname); 
                i.putExtra("PEMAIL", pemail); 
                i.putExtra("PPHONE", pphone); 
                i.putExtra("PMEET", pmeet); 
                i.putExtra("lat", latitude); 
                i.putExtra("long", longitude); 
                startActivityForResult(i, 0); 

               } 
              }) 
            .setNegativeButton(android.R.string.cancel, 
              null).create(); 
         } 

        }; 
       dg.show(getSupportFragmentManager(), "place_order_dialog"); 
      } else { 
        if (mEditingAfterReview) { 
         mPager.setCurrentItem(mPagerAdapter.getCount() - 1); 
        } else { 
         mPager.setCurrentItem(mPager.getCurrentItem() + 1); 
        } 
       } 

      } 
     }); 

     mPrevButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
        mPager.setCurrentItem(mPager.getCurrentItem() - 1); 
      } 
    }); 

    onPageTreeChanged(); 
    updateBottomBar(); 
} 

@Override 
public void onPageTreeChanged() { 
    mCurrentPageSequence = mWizardModel.getCurrentPageSequence(); 
    recalculateCutOffPage(); 
    mStepPagerStrip.setPageCount(mCurrentPageSequence.size() + 1); // + 1 = 
                                    // review 
                                    // step 
    mPagerAdapter.notifyDataSetChanged(); 
    updateBottomBar(); 
} 

private void updateBottomBar() { 
    int position = mPager.getCurrentItem(); 
    if (position == mCurrentPageSequence.size()) { 
      mNextButton.setText(R.string.finish); 
      mNextButton.setBackgroundResource(R.drawable.finish_background); 
      mNextButton.setTextAppearance(this, R.style.TextAppearanceFinish); 
    } else { 
      mNextButton.setText(mEditingAfterReview ? R.string.review 
          : R.string.next); 
      mNextButton 
          .setBackgroundResource(R.drawable.selectable_item_background); 
      TypedValue v = new TypedValue(); 
      getTheme().resolveAttribute(android.R.attr.textAppearanceMedium, v, 
          true); 
      mNextButton.setTextAppearance(this, v.resourceId); 
      mNextButton.setEnabled(position != mPagerAdapter.getCutOffPage()); 
    } 

    mPrevButton 
        .setVisibility(position <= 0 ? View.INVISIBLE : View.VISIBLE); 
} 

@Override 
protected void onDestroy() { 
    super.onDestroy(); 
    mWizardModel.unregisterListener(this); 
} 

@Override 
protected void onSaveInstanceState(Bundle outState) { 
    super.onSaveInstanceState(outState); 
    outState.putBundle("model", mWizardModel.save()); 
} 

@Override 
public AbstractWizardModel onGetModel() { 
    return mWizardModel; 
} 

@Override 
public void onEditScreenAfterReview(String key) { 
    for (int i = mCurrentPageSequence.size() - 1; i >= 0; i--) { 
      if (mCurrentPageSequence.get(i).getKey().equals(key)) { 
        mConsumePageSelectedEvent = true; 
        mEditingAfterReview = true; 
        mPager.setCurrentItem(i); 
        updateBottomBar(); 
        break; 
      } 
    } 
} 

@Override 
public void onPageDataChanged(Page page) { 
    if (page.isRequired()) { 
      if (recalculateCutOffPage()) { 
        mPagerAdapter.notifyDataSetChanged(); 
        updateBottomBar(); 
      } 
    } 
} 

@Override 
public Page onGetPage(String key) { 
    return mWizardModel.findByKey(key); 
} 

private boolean recalculateCutOffPage() { 
    // Cut off the pager adapter at first required page that isn't completed 
    int cutOffPage = mCurrentPageSequence.size() + 1; 
    for (int i = 0; i < mCurrentPageSequence.size(); i++) { 
      Page page = mCurrentPageSequence.get(i); 
      if (page.isRequired() && !page.isCompleted()) { 
        cutOffPage = i; 
        break; 
      } 
    } 

    if (mPagerAdapter.getCutOffPage() != cutOffPage) { 
      mPagerAdapter.setCutOffPage(cutOffPage); 
      return true; 
    } 

    return false; 
} 

public class MyPagerAdapter extends FragmentStatePagerAdapter { 
    private int mCutOffPage; 
    private Fragment mPrimaryItem; 

    public MyPagerAdapter(FragmentManager fm) { 
      super(fm); 
    } 

    @Override 
    public Fragment getItem(int i) { 
      if (i >= mCurrentPageSequence.size()) { 
        return new ReviewFragment(); 
      } 

      return mCurrentPageSequence.get(i).createFragment(); 
    } 

    @Override 
    public int getItemPosition(Object object) { 
      // TODO: be smarter about this 
      if (object == mPrimaryItem) { 
        // Re-use the current fragment (its position never changes) 
        return POSITION_UNCHANGED; 
      } 

      return POSITION_NONE; 
    } 

    @Override 
    public void setPrimaryItem(ViewGroup container, int position, 
        Object object) { 
      super.setPrimaryItem(container, position, object); 
      mPrimaryItem = (Fragment) object; 
    } 

    @Override 
    public int getCount() { 
      return Math.min(mCutOffPage + 1, mCurrentPageSequence == null ? 1 
          : mCurrentPageSequence.size() + 1); 
    } 

    public void setCutOffPage(int cutOffPage) { 
      if (cutOffPage < 0) { 
        cutOffPage = Integer.MAX_VALUE; 
      } 
      mCutOffPage = cutOffPage; 
    } 

    public int getCutOffPage() { 
      return mCutOffPage; 
    } 

    } 
} 

Answer 1

Вы не можете использовать PostPhotosActivity как деятельность, поскольку она не является деятельностью. Это фрагмент, потому что он распространяет Fragment не Activity. Имея это в манифесте ошибка и вызов startActivityForResult о намерении

Intent i = new Intent(
PostActivity.this, 
PostPhotosActivity.class); 

вызывает исключение в отливке, потому что Fragment просто не может быть преобразован в Activity.

Вы можете использовать компоновку xml с этим фрагментом в какой-либо другой деятельности или изменить фрагмент на активность. Пример шаблона XML:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="horizontal" 
    android:layout_width="match_parent" android:layout_height="match_parent"> 

    <fragment class="com.example.PostPhotosFragment" 
      android:id="@+id/post_photos_fragment" 
      android:layout_width="match_parent" android:layout_height="match_parent" /> 


</LinearLayout> 

, а затем в какой-либо деятельности, которая проходит Activity класса вызов setContentView(R.layout.yourlayout) и ваш фрагмент будет создан в вашей деятельности.