在發送到Firebase之前調整圖像大小

我有下面的代碼，我想在發送到Firebase之前降低來自相機或圖庫的圖像質量。正在發送圖像的路徑（Uri），如何在此處實現代碼？在發送到Firebase之前調整圖像大小

我該怎麼辦呢？ ................................................. .................................................. .....................................

private void showFileChooser() { 
    Intent intent = new Intent(); 
    intent.setType("image/*"); 
    intent.setAction(Intent.ACTION_GET_CONTENT); 
    startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST); 
} 

@Override 
protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 
    if ((requestCode == PICK_IMAGE_REQUEST || requestCode == REQUEST_IMAGE_CAPTURE) && resultCode == RESULT_OK && data != null && data.getData() != null) { 
     filePath = data.getData(); 
     if (requestCode == PICK_IMAGE_REQUEST) { 

      try { 
       Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath); 
       imageView.setImageBitmap(bitmap); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } else if (requestCode == REQUEST_IMAGE_CAPTURE) { 
      filePath = data.getData(); 
      Uri selectedImageUri = data.getData(); 
      imageView.setImageURI(selectedImageUri); 

     } 
    } 
} 




public String getFileExtension(Uri uri) { 
    ContentResolver cR = getContentResolver(); 
    MimeTypeMap mime = MimeTypeMap.getSingleton(); 
    return mime.getExtensionFromMimeType(cR.getType(uri)); 
} 

private void uploadFile() { 
    //checking if file is available 
    if (filePath != null && (editTextName.getText().toString().length() > 0) 
       && (editTextName1.getText().toString().length() > 0) 
       && (editTextName2.getText().toString().length() > 0) 
       ) { 


      //displaying progress dialog while image is uploading 
      final ProgressDialog progressDialog = new ProgressDialog(this); 
      progressDialog.setTitle("Uploading"); 
      progressDialog.show(); 

      //getting the storage reference 
      StorageReference sRef = storageReference.child(Constants.STORAGE_PATH_UPLOADS + System.currentTimeMillis() + "." + getFileExtension(filePath)); 

     //adding the file to reference 
     sRef.putFile(filePath) 
       .addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() { 
        @Override 
        public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) { 
         //dismissing the progress dialog 
         progressDialog.dismiss(); 

         //displaying success toast 
         Toast.makeText(getApplicationContext(), "File Uploaded ", Toast.LENGTH_LONG).show(); 
         Intent intent = new Intent(MainActivity.this, ShowMap.class); 
         startActivity(intent); 

         //creating the upload object to store uploaded image details 
         Upload upload = new Upload(editTextName.getText().toString().trim(), editTextName1.getText().toString().trim(), editTextName2.getText().toString().trim(), editTextLatitude.getText().toString().trim(), editTextLongitude.getText().toString().trim(), taskSnapshot.getDownloadUrl().toString()); 

         //adding an upload to firebase database 
         String uploadId = mDatabase.push().getKey(); 
         mDatabase.child(uploadId).setValue(upload); 



        } 
       }) 
        .addOnFailureListener(new OnFailureListener() { 
         @Override 
         public void onFailure(@NonNull Exception exception) { 
          progressDialog.dismiss(); 
          Toast.makeText(getApplicationContext(), exception.getMessage(), Toast.LENGTH_LONG).show(); 
         } 
        }) 
        .addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() { 
         @Override 
         public void onProgress(UploadTask.TaskSnapshot taskSnapshot) { 
          //displaying the upload progress 
          double progress = (100.0 * taskSnapshot.getBytesTransferred())/taskSnapshot.getTotalByteCount(); 
          progressDialog.setMessage("Uploaded " + ((int) progress) + "%..."); 
         } 
        }); 
     }else{ 
      Toast.makeText(this, "Error", Toast.LENGTH_LONG).show(); 

    } //display an error if no file is selected 

    }

來源

2017-08-26 FranciscoM

我能解決！

調整尺寸圖像

private String storeImage(Bitmap image) { 
     File pictureFile = getOutputMediaFile(); 
     if (pictureFile == null) { 
      Log.d("log", 
        "Error creating media file, check storage permissions: ");// e.getMessage()); 
      return null; 
     } 
     try { 
      FileOutputStream fos = new FileOutputStream(pictureFile); 
      image.compress(Bitmap.CompressFormat.JPEG, 30, fos); 
      fos.close(); 
     } catch (FileNotFoundException e) { 
      Log.d("log", "File not found: " + e.getMessage()); 
     } catch (IOException e) { 
      Log.d("log", "Error accessing file: " + e.getMessage()); 
     } 
     return null; 
    } 

    /** Create a File for saving an image or video */ 
    private File getOutputMediaFile(){ 
     // To be safe, you should check that the SDCard is mounted 
     // using Environment.getExternalStorageState() before doing this. 
     File mediaStorageDir = new File(Environment.getExternalStorageDirectory() 
       + "/Android/data/" 
       + getApplicationContext().getPackageName() 
       + "/Files"); 

     // This location works best if you want the created images to be shared 
     // between applications and persist after your app has been uninstalled. 

     // Create the storage directory if it does not exist 
     if (! mediaStorageDir.exists()){ 
      if (! mediaStorageDir.mkdirs()){ 
       return null; 
      } 
     } 
     // Create a media file name 
     String timeStamp = new SimpleDateFormat("ddMMyyyy_HHmm").format(new Date()); 
     File mediaFile; 
     String mImageName="MI_"+ timeStamp +".jpg"; 
     mediaFile = new File(mediaStorageDir.getPath() + File.separator + mImageName); 
     Log.v("log", "save: " + mediaStorageDir.getAbsoluteFile()); 
     return mediaFile; 
    }

onActivityResult

protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    super.onActivityResult(requestCode, resultCode, data); 
    if ((requestCode == PICK_IMAGE_REQUEST || requestCode == REQUEST_IMAGE_CAPTURE) && resultCode == RESULT_OK && data != null && data.getData() != null) { 
     filePath = data.getData(); 
     if (requestCode == PICK_IMAGE_REQUEST) { 
      try { 
       bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath); 
       storeImage(bitmap); 
       imageView.setImageBitmap(bitmap); 
       Log.v("log", "path = " + getOutputMediaFile().getAbsoluteFile()); 
       imagemfinal = Uri.fromFile(getOutputMediaFile().getAbsoluteFile()); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } else if (requestCode == REQUEST_IMAGE_CAPTURE) { 
      filePath = data.getData(); 
      Uri selectedImageUri = data.getData(); 
      try { 
       Bitmap bitmap1 = MediaStore.Images.Media.getBitmap(this.getContentResolver(), selectedImageUri); 
       storeImage(bitmap1); 
       imagemfinal = Uri.fromFile(getOutputMediaFile().getAbsoluteFile()); 
       imageView.setImageBitmap(bitmap1); 
      } catch (IOException e) { 
       e.printStackTrace(); 
      } 
     } 
    } 
}

來源

2017-08-29 01:00:09 FranciscoM

Bitmap image2 = (Bitmap) data.getExtras().get("data"); 
img.setImageBitmap(image2); 
String incident_ID = IncidentFormActivity.incident_id; 

imagepath="/sdcard/RDMS/"+incident_ID+ x + ".PNG"; 
File file = new File(imagepath); 
    try { 
     double xFactor = 0; 
     double width = Double.valueOf(image2.getWidth()); 
     Log.v("WIDTH", String.valueOf(width)); 
     double height = Double.valueOf(image2.getHeight()); 
     Log.v("height", String.valueOf(height)); 
     if(width>height){ 
     xFactor = 841/width; 
    } 
    else{ 
     xFactor = 595/width; 
    } 


Log.v("Nheight", String.valueOf(width*xFactor)); 
Log.v("Nweight", String.valueOf(height*xFactor)); 
int Nheight = (int) ((xFactor*height)); 
int NWidth =(int) (xFactor * width) ; 

bm = Bitmap.createScaledBitmap(image2,NWidth, Nheight, true); 
file.createNewFile(); 
FileOutputStream ostream = new FileOutputStream(file); 
bm.compress(CompressFormat.PNG, 100, ostream); 
ostream.close();

這是代碼調整圖像..

來源

2017-08-26 04:54:44

檢查這個類。這有利於壓縮圖像

class ImageFile(val uri: Uri, name: String) { 

    val filename: String 

    init { 
     val file = File(Environment.getExternalStorageDirectory().toString() + "/Documents") 
     if (!file.exists()) { 
      file.mkdirs() 
     } 
     val fileNoMedia = File(file.absolutePath + "/.nomedia") 
     if (!fileNoMedia.exists()) 
      fileNoMedia.createNewFile() 
     if (name.toLowerCase().endsWith(".pdf")) { 
      filename = file.absolutePath + "/" + System.currentTimeMillis() + ".pdf" 
     } else { 
      filename = file.absolutePath + "/" + System.currentTimeMillis() + ".jpg" 
     } 
    } 

    @Throws(IOException::class) 
    fun copyFileStream(context: Context, uri: Uri): String { 
     if (filename.endsWith(".pdf") || filename.endsWith(".PDF")) { 
      var ins: InputStream? = null 
      var os: OutputStream? = null 
      try { 
       ins = context.getContentResolver().openInputStream(uri) 
       os = FileOutputStream(filename) 
       val buffer = ByteArray(1024) 
       var length: Int = ins.read(buffer) 
       while (length > 0) { 
        os.write(buffer, 0, length); 
        length = ins.read(buffer) 
       } 
      } catch (e: Exception) { 
       e.printStackTrace(); 
      } finally { 
       ins?.close() 
       os?.close() 
      } 
     } else { 
      var ins: InputStream? = null 
      var os: OutputStream? = null 
      try { 
       ins = context.getContentResolver().openInputStream(uri) 
       var scaledBitmap: Bitmap? = null 
       val options = BitmapFactory.Options() 
       options.inJustDecodeBounds = true 
       var bmp = BitmapFactory.decodeStream(ins, null, options) 
       var actualHeight = options.outHeight 
       var actualWidth = options.outWidth 

       //  max Height and width values of the compressed image is taken as 816x612 
       val maxHeight = 816.0f 
       val maxWidth = 612.0f 
       var imgRatio = (actualWidth/actualHeight).toFloat() 
       val maxRatio = maxWidth/maxHeight 

       //  width and height values are set maintaining the aspect ratio of the image 
       if (actualHeight > maxHeight || actualWidth > maxWidth) { 
        if (imgRatio < maxRatio) { 
         imgRatio = maxHeight/actualHeight 
         actualWidth = (imgRatio * actualWidth).toInt() 
         actualHeight = maxHeight.toInt() 
        } else if (imgRatio > maxRatio) { 
         imgRatio = maxWidth/actualWidth 
         actualHeight = (imgRatio * actualHeight).toInt() 
         actualWidth = maxWidth.toInt() 
        } else { 
         actualHeight = maxHeight.toInt() 
         actualWidth = maxWidth.toInt() 

        } 
       } 

       //  setting inSampleSize value allows to load a scaled down version of the original image 
       options.inSampleSize = calculateInSampleSize(options, actualWidth, actualHeight) 

       //  inJustDecodeBounds set to false to load the actual bitmap 
       options.inJustDecodeBounds = false 

       //  this options allow android to claim the bitmap memory if it runs low on memory 
       options.inPurgeable = true 
       options.inInputShareable = true 
       options.inTempStorage = ByteArray(16 * 1024) 


       try { 
        //   load the bitmap from its path 
        ins.close() 
        ins = context.getContentResolver().openInputStream(uri) 
        bmp = BitmapFactory.decodeStream(ins, null, options) 
       } catch (exception: OutOfMemoryError) { 
        exception.printStackTrace() 

       } 

       try { 
        scaledBitmap = Bitmap.createBitmap(actualWidth, actualHeight, Bitmap.Config.ARGB_8888) 
       } catch (exception: OutOfMemoryError) { 
        exception.printStackTrace() 
       } 

       val ratioX = actualWidth/options.outWidth.toFloat() 
       val ratioY = actualHeight/options.outHeight.toFloat() 
       val middleX = actualWidth/2.0f 
       val middleY = actualHeight/2.0f 

       val scaleMatrix = Matrix() 
       scaleMatrix.setScale(ratioX, ratioY, middleX, middleY) 

       val canvas = Canvas(scaledBitmap!!) 
       canvas.matrix = scaleMatrix 
       canvas.drawBitmap(bmp, middleX - bmp.width/2, middleY - bmp.height/2, Paint(Paint.FILTER_BITMAP_FLAG)) 

       os = FileOutputStream(filename) 
       scaledBitmap.compress(Bitmap.CompressFormat.JPEG, 80, os) 
       val buffer = ByteArray(1024) 
       var length: Int = ins.read(buffer) 
       while (length > 0) { 
        os.write(buffer, 0, length); 
        length = ins.read(buffer) 
       } 
      } catch (e: Exception) { 
       e.printStackTrace(); 
      } finally { 
       ins?.close() 
       os?.close() 
      } 
     } 
     return filename 
    } 

    fun calculateInSampleSize(options: BitmapFactory.Options, reqWidth: Int, reqHeight: Int): Int { 
     val height = options.outHeight 
     val width = options.outWidth 
     var inSampleSize = 1 
     if (height > reqHeight || width > reqWidth) { 
      val heightRatio = Math.round(height.toFloat()/reqHeight.toFloat()) 
      val widthRatio = Math.round(width.toFloat()/reqWidth.toFloat()) 
      inSampleSize = if (heightRatio < widthRatio) heightRatio else widthRatio 
     } 
     val totalPixels = (width * height).toFloat() 
     val totalReqPixelsCap = (reqWidth * reqHeight * 2).toFloat() 
     while (totalPixels/(inSampleSize * inSampleSize) > totalReqPixelsCap) { 
      inSampleSize++ 
     } 

     return inSampleSize 
    } 
}

更多請訪問：this link

來源

2017-08-26 06:20:12

在發送到Firebase之前調整圖像大小

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