如何在存储 SD 卡之前裁剪捕获的图像？ [复制]

Posted 2023-02-25

【中文标题】如何在存储 SD 卡之前裁剪捕获的图像？ [复制]

【英文标题】：How to crop captured image before storing sd card? [duplicate]

【发布时间】：2013-06-03 05:50:24

【问题描述】：

嗨，我是 android 的新人....我想在捕获图像时裁剪并将图像保存在 sd 卡中....当我们捕获图像时它不存储在 sd 卡中...之后只裁剪它保存在sd卡中？...图像质量不应该影响...我们可以知道这条路径..我没有关于这个的代码...如果可以请提供完整的代码..这个代码被强制关闭..我不知道如何解决这个.. 请提前告诉我谢谢

    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;
      
    

【参考方案1】：

如果您已经有了位图，下面的代码将对其进行裁剪并将其保存在指定的路径中（确保路径存在）。该文件将以指定的格式保存。如果您选择 jpeg，则必须指定品质因数。保存为 png 将忽略质量参数。

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();