Question

嗨，我是Android的新人....我想在我拍摄图像时裁剪并保存sd卡中的图像....当我们拍摄图像时，它不会存储在SD卡中...之后裁剪只保存在SD卡？...图像质量不应该影响...我们可以知道这条路径..我没有关于此的代码...请提供完整的代码，如果你可以..这代码是强制关闭..我不知道如何解决这个问题.. 请事先告诉我谢谢

    import java.io.FileNotFoundException;
    import java.io.IOException;   
    import android.content.ContentResolver;
    import android.content.Context;
    import android.graphics.Bitmap;
    import android.graphics.BitmapFactory;
    import android.net.Uri;
    import android.os.ParcelFileDescriptor;
    import android.util.Log;

    public class ImageResize {
      private Context mContext;
      private int mWidth;
      private int mHeight;
      private Uri mImageUri;
      private BitmapFactory.Options mBitMapOptions;
      private Bitmap mBitMap;
      private Bitmap tempBitMap;

      public ImageResize(Context context, int width, int height, Uri imgUri){
        this.mContext = context;
        this.mWidth = width;
        this.mHeight = height;
        this.mImageUri = imgUri;
      }

      public Bitmap getResizeImage(){
        ContentResolver resolver = mContext.getContentResolver();
        mBitMapOptions = new BitmapFactory.Options();

        if(mImageUri != null){
          ParcelFileDescriptor fd = null;
          try {
            fd = resolver.openFileDescriptor(mImageUri, "r");
            int sampleSize = 1;

            mBitMapOptions.inJustDecodeBounds = true;
            BitmapFactory.decodeFileDescriptor(fd.getFileDescriptor(), null, mBitMapOptions);

            int nextWidth = mBitMapOptions.outWidth >> 1;
            int nextHeight = mBitMapOptions.outHeight >> 1;

            while(nextWidth > mWidth && nextHeight > mHeight){
              sampleSize <<= 1;
              nextWidth >>= 1;
              nextHeight >>= 1;
            }

            mBitMapOptions.inSampleSize = sampleSize;
            mBitMapOptions.inJustDecodeBounds = false;

            mBitMap = BitmapFactory.decodeFileDescriptor(fd.getFileDescriptor(), null, mBitMapOptions);
            Log.d("Result","Image use Size : " +mWidth+"," +mHeight);
            Log.d("Result","Image Size : " +mBitMap.getWidth()+"," + mBitMap.getHeight());
            Log.d("Result","aa : " +(mWidth*mBitMap.getHeight())/mBitMap.getWidth());
            if(mBitMap!=null){
              if(mBitMapOptions.outWidth != mWidth || mBitMapOptions.outHeight != mHeight){ 
                //??????? :  ???? ????????  =  (???? ???????? * ?????????) / ????????? 
                tempBitMap = Bitmap.createScaledBitmap(mBitMap, mWidth, (mWidth*mBitMap.getHeight())/mBitMap.getWidth(), true);
                mBitMap.recycle();
                mBitMap = tempBitMap;
              }
            }

            return mBitMap;

          } catch (FileNotFoundException e) {
            Log.e(getClass().getSimpleName(), e.getMessage(), e);
          } finally {
              try { if(fd != null) fd.close(); } catch (IOException e) { Log.e(getClass().getSimpleName(), e.getMessage(), e);}
              if(mBitMap != null) mBitMap = null;
              if(tempBitMap != null) tempBitMap = null;
          }
        }
        return null;
      }
    }

Answer 1

如果您已经有位图，则以下代码将裁剪它并将其保存在指定路径（确保路径存在）。该文件将以指定的格式保存。如果选择jpeg，则必须指定品质因数。保存在png中会忽略质量参数。

File outputFile = new File("/sdcard/SaveDir/SaveBitmap.png");
//x,y is the starting point and width,height is the distance from start
//createBitmap(Bitmap source, int x, int y, int width, int height)
Bitmap bitmap = Bitmap.createBitmap(originalBitmap, 0, 0, 20, 20);
OutputStream fout = null;

try {
    fout = new FileOutputStream(outputFile);
    //if format is png(lossless) then quality argument is ignored
    //(Bitmap.CompressFormat format, int quality, OutputStream stream)
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, fout);
    fout.flush();
    fout.close();

    } catch (FileNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
}

如何在存储SD卡之前裁剪拍摄的图像？

1 个答案: