Как предотвратить Java.langNullPointerexception При сохранении изображений на parse.com

Question

Я изменил приложение anywall, чтобы иметь возможность отправлять фотографии на parse.com. Приложение может отправлять текст и изображения на parse.com, но он падает, и я получаю Java.langNullPointerexception, если я отправляю текст с изображением, чтобы перейти с этим текстом. Я хочу иметь возможность размещать текст с изображениями или без них.

Вот мой код

// UI references. 
    private EditText txtEdit_Text; 
    private TextView txtCharacter_count; 
    private Button btnPost; 
    private int maxCharacterCount = Application.getConfigHelper().getPostMaxCharacterCount(); 
    private ParseGeoPoint geoPoint; 

    private String selectedImagePath = ""; 
    final private int PICK_IMAGE = 1; 
    final private int CAPTURE_IMAGE = 2; 
    private String imgPath; 

    private static FrameLayout imagePreviewFrame; 
    private ImageView imgView; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

    setContentView(R.layout.activity_post); 
    Intent intent = getIntent(); 
    Location location = intent.getParcelableExtra(Application.INTENT_EXTRA_LOCATION); 
    geoPoint = new ParseGeoPoint(location.getLatitude(), location.getLongitude()); 

    txtEdit_Text = (EditText) findViewById(R.id.txtEdit_Text); 
    txtEdit_Text.addTextChangedListener(new TextWatcher() { 
     @Override 
     public void beforeTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { 
     } 

     @Override 
     public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) { 
     } 

     @Override 
     public void afterTextChanged(Editable s) { 
      updatePostButtonState(); 
      updateCharacterCountTextViewText(); 
     } 
    }); 

    txtCharacter_count =(TextView) findViewById(R.id.txtCharacter_count); 

    btnPost = (Button) findViewById(R.id.btnPost); 
    btnPost.setOnClickListener(
      new View.OnClickListener() { 
       public void onClick(View v) { 
        post(); 
       } 
      }); 

    updatePostButtonState(); 
    updateCharacterCountTextViewText(); 

    imagePreviewFrame = (FrameLayout) findViewById(R.id.image_preview_frame); 
     imgView = (ImageView) findViewById(R.id.image_preview); 
    //Capture pic 

    ImageButton butCamera = (ImageButton) findViewById(R.id.btnCapturePhoto); 
    butCamera.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 

      final Intent intent = new Intent(
        MediaStore.ACTION_IMAGE_CAPTURE); 
      intent.putExtra(MediaStore.EXTRA_OUTPUT, 
        setImageUri()); 
      startActivityForResult(intent, CAPTURE_IMAGE); 
     } 
    }); 
//Open gallery 

    ImageButton butGallery = (ImageButton) findViewById(R.id.btnupload); 
    butGallery.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      Intent intent = new Intent(); 
      intent.setType("image/*"); 
      intent.setAction(Intent.ACTION_GET_CONTENT); 
      startActivityForResult(
        Intent.createChooser(intent, ""), 
        PICK_IMAGE); 
     } 
    }); 
} 

public Uri setImageUri() { 
    // Store image in dcim 
    File file = new File(Environment.getExternalStorageDirectory() 
      + "/DCIM/", "image" + new Date().getTime() + ".png"); 
    Uri imgUri = Uri.fromFile(file); 
    this.imgPath = file.getAbsolutePath(); 
    return imgUri; 
} 

public String getImagePath() { 
    return imgPath; 
} 
@Override 
protected void onActivityResult(int requestCode, int resultCode, 
           Intent data) { 
    if (resultCode != Activity.RESULT_CANCELED) { 
     if (requestCode == PICK_IMAGE) { 
      selectedImagePath = getAbsolutePath(data.getData()); 
      imgView.setImageBitmap(decodeFile(selectedImagePath)); 
      imagePreviewFrame.setVisibility(View.VISIBLE); 
     } else if (requestCode == CAPTURE_IMAGE) { 
      selectedImagePath = getImagePath(); 
      imagePreviewFrame.setVisibility(View.VISIBLE); 
      imgView.setImageBitmap(decodeFile(selectedImagePath)); 
     } else { 
      super.onActivityResult(requestCode, resultCode, 
        data); 
     } 
    } 
} 

public Bitmap decodeFile(String path) { 
    try { 
     // Decode image size 
     BitmapFactory.Options o = new BitmapFactory.Options(); 
     o.inJustDecodeBounds = true; 
     BitmapFactory.decodeFile(path, o); 
     // The new size we want to scale to 
     final int REQUIRED_SIZE = 70; 

     // Find the correct scale value. It should be the power of 
     // 2. 
     int scale = 1; 
     while (o.outWidth/scale/2 >= REQUIRED_SIZE 
       && o.outHeight/scale/2 >= REQUIRED_SIZE) 
      scale *= 2; 

     // Decode with inSampleSize 
     BitmapFactory.Options o2 = new BitmapFactory.Options(); 
     o2.inSampleSize = scale; 
     return BitmapFactory.decodeFile(path, o2); 
    } catch (Throwable e) { 
     e.printStackTrace(); 
    } 
    return null; 
} 

public String getAbsolutePath(Uri uri) { 
    String[] projection = { MediaStore.MediaColumns.DATA }; 
    @SuppressWarnings("deprecation") 
    Cursor cursor = managedQuery(uri, projection, null, null, null); 
    if (cursor != null) { 
     int column_index = cursor 
       .getColumnIndexOrThrow(MediaStore.MediaColumns.DATA); 
     cursor.moveToFirst(); 
     return cursor.getString(column_index); 
    } else 
     return null; 
} 


private void post() { 

    String text = txtEdit_Text.getText().toString().trim(); 
    int Count = 0; 

    // Set up a progress dialog 
    final ProgressDialog dialog = new ProgressDialog(PostActivity.this); 
    dialog.setMessage(getString(R.string.progress_post)); 
    dialog.show(); 
    // Create a post. 
    HowzitPost post = new HowzitPost(); 
    Long time = System.currentTimeMillis(); 

    Bitmap bitmap = BitmapFactory.decodeFile(getImagePath()); 
    ByteArrayOutputStream stream = new ByteArrayOutputStream(); 
    bitmap.compress(Bitmap.CompressFormat.PNG,100,stream); 

    byte [] image = stream.toByteArray(); 

    ParseFile file = new ParseFile("images.png",image); 

    ArrayList<String> arrayList = new ArrayList<>(); 
    String currentuserid = ParseUser.getCurrentUser().getObjectId(); 
    arrayList.add(currentuserid); 

post.setLocation(geoPoint); 
post.setText(text); 
post.setTimestamp(time); 
post.setVote(Count); 
post.setComments(Count); 
post.setUser(ParseUser.getCurrentUser()); 
post.setlist(arrayList); 
post.setPhotoFile(file); 

// Set the location to the current user's location 
    ParseACL acl = new ParseACL(); 
    // Give public read access 
    acl.setPublicReadAccess(true); 
    acl.setPublicWriteAccess(true); 
    post.setACL(acl); 

    // Save the post change to save in the background 
    post.saveInBackground(new SaveCallback() { 
     @Override 
     public void done(ParseException e) { 
      dialog.dismiss(); 
      finish(); 
     } 
    }); 
} 

private String getPostEditTextText() { 
    return txtEdit_Text.getText().toString().trim(); 
} 

private void updatePostButtonState() { 
    int length = getPostEditTextText().length(); 
    boolean enabled = length > 0 && length < maxCharacterCount; 
    btnPost.setEnabled(enabled); 
} 

private void updateCharacterCountTextViewText() { 
    String characterCountString = String.format("%d/%d", txtEdit_Text.length(), maxCharacterCount); 
    txtCharacter_count.setText(characterCountString); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.menu_post, menu); 
    return true; 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    // Handle action bar item clicks here. The action bar will 
    // automatically handle clicks on the Home/Up button, so long 
    // as you specify a parent activity in AndroidManifest.xml. 
    int id = item.getItemId(); 

    //noinspection SimplifiableIfStatement 
    if (id == R.id.action_settings) { 
     return true; 
    } 
    return super.onOptionsItemSelected(item); 
} 

Вот мой XML.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    tools:context=".PostActivity" > 

    <include 
     android:id="@+id/app_bar" 
     layout="@layout/toolbar2"/> 

     <EditText 
      android:id="@+id/txtEdit_Text" 
      android:layout_width="fill_parent" 
      android:layout_height="wrap_content" 
      android:layout_below="@+id/app_bar" 
      android:background="@null" 
      android:hint="@string/prompt_post" 
      android:inputType="textMultiLine" 
      android:gravity="top"> 
      <requestFocus /> 

     </EditText> 

     <FrameLayout 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:id="@+id/image_preview_frame" 
      android:visibility="gone" 
      android:layout_below="@id/txtEdit_Text" 
      android:layout_centerInParent="true" 
      android:layout_margin="5dp"> 

      <ImageView 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:id="@+id/image_preview" 
       android:layout_below="@id/skootText" 
       android:scaleType="centerCrop" 
       /> 
      <TextView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_gravity="top|right" 
       android:onClick="removeImage" 
       android:text="x" 
       android:textSize="22sp" 
       android:clickable="true" 
       android:textColor="@color/textColorPrimary" 
       android:layout_marginRight="5dp"/> 
     </FrameLayout> 

    <RelativeLayout 
     android:id="@+id/bottom" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:background="@drawable/border" 
     android:layout_alignParentBottom="true"> 

     <ImageButton 
      android:id="@+id/btnSettings" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginLeft="5dp" 
      android:layout_marginStart="5dp" 
      android:layout_alignBottom="@+id/btnCapturePhoto" 
      android:contentDescription="@null" 
      android:background="?android:selectableItemBackground" 
      android:src="@drawable/ic_action_settings"/> 
     <ImageButton 
      android:id="@+id/btnCapturePhoto" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_centerInParent="true" 
      android:contentDescription="@null" 
      android:background="?android:selectableItemBackground" 
      android:src="@drawable/ic_action_picblue"/> 

     <ImageButton 
      android:id="@+id/btnupload" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_marginRight="5dp" 
      android:layout_marginEnd="5dp" 
      android:layout_alignParentRight="true" 
      android:layout_alignParentEnd="true" 
      android:layout_alignBottom="@+id/btnCapturePhoto" 
      android:contentDescription="@null" 
      android:background="?android:selectableItemBackground" 
      android:src="@drawable/ic_action_vidzb"/> 
    </RelativeLayout> 
</RelativeLayout> 

Answer 1

Проверка на нуль перед загрузкой на сервер, как

if(image != null){ 
    upload(); 
} 
else{ 
    Toast.makeToast(this,"Null value",200).show(); 
}