在保存之前调整从相机拍摄的图像大小

Question

我正在使用内置相机应用程序拍照，并获得图像分辨率 (1600 x 1200) 但我想将 (1200 x 900) 中的所有图像保存到 SD 卡中，因为我已经编写了一个方法但是仍然获得原始大小的图像。

这是我的代码，我用它来捕获图像并将其存储到 SD 卡中

public class FormActivity extends AppCompatActivity {

String filePath = null;
File file;
Uri output;
final int requestCode = 100;

String stringImageName= null;

static int w = 1200;
static int h = 900;

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

    setContentView(R.layout.activity_form);     

    SimpleDateFormat s = new SimpleDateFormat("ddMMyyyyhhmmss");
    stringImageName = s.format(new Date());
    Log.d("format::", stringImageName);

    filePath = Environment.getExternalStorageDirectory() + "/"+stringImageName+".jpeg";
    file = new File(filePath);
    output = Uri.fromFile(file);


    buttonOrderNow.setOnClickListener(new OnClickListener() {

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

            Intent photoCaptureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
            photoCaptureIntent.putExtra(MediaStore.EXTRA_OUTPUT, output);                       
            startActivityForResult(photoCaptureIntent, requestCode);

        }
    });

}


@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if(this.requestCode == requestCode && resultCode == RESULT_OK) {

         resize();

    }
}

private void resize() {

    Long startTime = System.currentTimeMillis();

    Bitmap bitmap_Source = BitmapFactory.decodeFile(filePath);
     float factorH = h / (float)bitmap_Source.getHeight();
     float factorW = w / (float)bitmap_Source.getWidth();
     float factorToUse = (factorH > factorW) ? factorW : factorH;
     Bitmap bm = Bitmap.createScaledBitmap(bitmap_Source, 
       (int) (bitmap_Source.getWidth() * factorToUse), 
       (int) (bitmap_Source.getHeight() * factorToUse), 
       false);      

     Long endTime = System.currentTimeMillis();
     Long processTime = endTime - startTime;
     Toast.makeText(FormActivity.this, ""+processTime, Toast.LENGTH_LONG).show();

    }

Answer 1

我猜这个， 你应该传递值高度和宽度 传递您的图像路径并获得准确的图像

private Bitmap getBitmap(String path) {

Uri uri = getImageUri(path);
InputStream in = null;
try {
    final int IMAGE_MAX_SIZE = 1920000; // 1.9MP
    in = mContentResolver.openInputStream(uri);
    // Decode image size
    BitmapFactory.Options o = new BitmapFactory.Options();
    o.inJustDecodeBounds = true;
    BitmapFactory.decodeStream(in, null, o);
    in.close();
    int scale = 1;
    while ((o.outWidth * o.outHeight) * (1 / Math.pow(scale, 2)) > 
          IMAGE_MAX_SIZE) {
       scale++;
    }
    Log.d(TAG, "scale = " + scale + ", orig-width: " + o.outWidth + ", 
       orig-height: " + o.outHeight);
    Bitmap b = null;
    in = mContentResolver.openInputStream(uri);
    if (scale > 1) {
        scale--;
        // scale to max possible inSampleSize that still yields an image
        // larger than target
        o = new BitmapFactory.Options();
        o.inSampleSize = scale;
        b = BitmapFactory.decodeStream(in, null, o);

        // resize to desired dimensions
        int height = b.getHeight(); 
        int width = b.getWidth();
        Log.d(TAG, "1th scale operation dimenions - width: " + width + ",
           height: " + height);

        double y = Math.sqrt(IMAGE_MAX_SIZE
                / (((double) width) / height));
        double x = (y / height) * width;

        Bitmap scaledBitmap = Bitmap.createScaledBitmap(b, (int) x, 
           (int) y, true);
        b.recycle();
        b = scaledBitmap;

        System.gc();
    } else {
        b = BitmapFactory.decodeStream(in);
    }
    in.close();

    Log.d(TAG, "bitmap size - width: " +b.getWidth() + ", height: " + 
       b.getHeight());
    return b;
} catch (IOException e) {
    Log.e(TAG, e.getMessage(),e);
    return null;
}

Answer 2

取自here。

protected void onActivityResult(int requestCode, int resultCode, Intent data) {  
    if(this.requestCode == requestCode && resultCode == RESULT_OK){  
        Bitmap yourBitmap= (Bitmap) data.getExtras().get("data"); 
        //Resize it as you need
        Bitmap resized = Bitmap.createScaledBitmap(yourBitmap, 1200, 900, true);

        //Now you can save it
    }  
}