Question

我创建了一个位图，现在我想将该位图保存到某个目录。任何人都可以告诉我这是如何完成的。感谢

FileInputStream in;
          BufferedInputStream buf;
           try {
                  in = new FileInputStream("/mnt/sdcard/dcim/Camera/2010-11-16_18-57-18_989.jpg");
                  buf = new BufferedInputStream(in);
                  Bitmap _bitmapPreScale = BitmapFactory.decodeStream(buf);
                  int oldWidth = _bitmapPreScale.getWidth();
                  int oldHeight = _bitmapPreScale.getHeight();
                  int newWidth = 2592; 
                  int newHeight = 1936;

                  float scaleWidth = ((float) newWidth) / oldWidth;
                  float scaleHeight = ((float) newHeight) / oldHeight;

                  Matrix matrix = new Matrix();
               // resize the bit map
                  matrix.postScale(scaleWidth, scaleHeight);
                  Bitmap _bitmapScaled = Bitmap.createBitmap(_bitmapPreScale, 0, 0,  oldWidth, oldHeight, matrix, true);

（我想将_bitmapScaled保存到SD卡上的文件夹中）

Answer 1

您好您可以将数据写入字节，然后在sdcard文件夹中创建一个文件，其中包含您想要的任何名称和扩展名，然后将字节写入该文件。这会将位图保存到SD卡。

ByteArrayOutputStream bytes = new ByteArrayOutputStream();
_bitmapScaled.compress(Bitmap.CompressFormat.JPEG, 40, bytes);

//you can create a new file name "test.jpg" in sdcard folder.
File f = new File(Environment.getExternalStorageDirectory()
                        + File.separator + "test.jpg");
f.createNewFile();
//write the bytes in file
FileOutputStream fo = new FileOutputStream(f);
fo.write(bytes.toByteArray());

// remember close de FileOutput
fo.close();

Answer 2

您也可以试试这个。

  OutputStream fOut = null;
                        File file = new File(strDirectoy,imgname);
                            fOut = new FileOutputStream(file);

                        bitmap.compress(Bitmap.CompressFormat.JPEG, 85, fOut);
                            fOut.flush();
                            fOut.close();

                MediaStore.Images.Media.insertImage(getContentResolver(),file.getAbsolutePath(),file.getName(),file.getName());

Answer 3

_bitmapScaled.compress()应该做到这一点。查看文档：{{3}}，int，java.io.OutputStream）

Answer 4

只需将扩展名更改为 .bmp 。

这样做：

ByteArrayOutputStream bytes = new ByteArrayOutputStream();
_bitmapScaled.compress(Bitmap.CompressFormat.PNG, 40, bytes);

//you can create a new file name "test.BMP" in sdcard folder.
File f = new File(Environment.getExternalStorageDirectory()
                        + File.separator + "test.bmp")

听起来我只是在鬼混，但尝试一次，它将以BMP格式保存。干杯！

Answer 5

这个答案是对OOM和其他各种泄漏的更多考虑的更新。

假设您有一个目标作为目标，并且已经定义了名称String。

    File destination = new File(directory.getPath() + File.separatorChar + filename);

    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    source.compress(Bitmap.CompressFormat.PNG, 100, bytes);

    FileOutputStream fo = null;
    try {
        destination.createNewFile();

        fo = new FileOutputStream(destination);
        fo.write(bytes.toByteArray());
    } catch (IOException e) {

    } finally {
        try {
            fo.close();
        } catch (IOException e) {}
    }

Answer 6

将位图传递给saveImage方法，它会将你的位图保存在saveBitmap的名称中，在创建的测试文件夹中。

private void saveImage(Bitmap data) {
                    File createFolder = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES),"test");
                    if(!createFolder.exists())
                    createFolder.mkdir();
                    File saveImage = new File(createFolder,"saveBitmap.jpg");
                    try {
                        OutputStream outputStream = new FileOutputStream(saveImage);
                        data.compress(Bitmap.CompressFormat.JPEG,100,outputStream);
                        outputStream.flush();
                        outputStream.close();
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }

并使用此：

  saveImage(bitmap);

Android Saving创建位图到SD卡上的目录

6 个答案: