图片和文件传输压缩总结

来源：互联网发布：手机科研数据处理软件编辑：程序博客网时间：2024/05/19 13:44

转载请注明出处：http://blog.csdn.net/krislight/article/

1.壓縮圖片工具类

public class CompressImage {    private Bitmap bm;    private String filePath;    public CompressImage(String filePath) {        this.filePath = filePath;    }    public Bitmap getBitmap() throws Exception{        BitmapFactory.Options opt = new BitmapFactory.Options();        opt.inJustDecodeBounds = true;        bm = BitmapFactory.decodeFile(filePath, opt);        int picWidth = opt.outWidth;        int picHeight = opt.outHeight;        WindowManager windowManager = getWindowManager();        Display display = windowManager.getDefaultDisplay();        int screenWidth = display.getWidth();        int screenHeight = display.getHeight();        opt.inSampleSize = 1;        if (picWidth > picHeight) {            if (picWidth > screenWidth)                opt.inSampleSize = picWidth / screenWidth;        } else {            if (picHeight > screenHeight)                opt.inSampleSize = picHeight / screenHeight;        }        opt.inJustDecodeBounds = false;        bm = BitmapFactory.decodeFile(filePath, opt);        return compressImage(bm,PIC_TRANSFORM_SIZE);    }    private Bitmap compressImage(Bitmap image,int size) {        try {            ByteArrayOutputStream baos = new ByteArrayOutputStream();            image.compress(Bitmap.CompressFormat.JPEG, 100, baos);            int options = 100;            while (baos.toByteArray().length/1024 > size) {                baos.reset();                image.compress(Bitmap.CompressFormat.JPEG, options, baos);                              options -= 10;            }            if(image!=null){            if(!image.isRecycled()){            image.recycle();            }            image = null;            }            ByteArrayInputStream isBm = new ByteArrayInputStream(                    baos.toByteArray());            Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);            return bitmap;        } catch (Exception e) {            e.printStackTrace();            return null;        }     }}

使用步骤：

CompressImage compress=new CompressImage(m_strFileFullPath);bitmap = compress.getBitmap();                 if(bitmap !=null){            String tSDPath = getExternalFilesDir(null).getAbsolutePath();                File fileDir = new File(tSDPath,"/SendFileTemp/");                    if (!fileDir.exists()) {                    fileDir.mkdirs();                    }                String path = tSDPath + "/SendFileTemp/"+System.currentTimeMillis()+".jpg";                FileOutputStream fileOutputStream = new FileOutputStream(new File(path));                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fileOutputStream);                file = new File(path);                }

2.壓縮文件工具類

public static void zipFile(String oriFilePath, String zipFilePath)throws IOException {BufferedInputStream origin = null;ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipFilePath)));try {byte data[] = new byte[1000];FileInputStream fi = new FileInputStream(oriFilePath);origin = new BufferedInputStream(fi, 1000);try {ZipEntry entry = new ZipEntry(oriFilePath.substring(oriFilePath.lastIndexOf("/") + 1));out.putNextEntry(entry);int count;while ((count = origin.read(data, 0, 1000)) != -1) {out.write(data, 0, count);}} finally {origin.close();}} finally {out.close();}}

使用时:

String tSDPath = getExternalFilesDir(null).getAbsolutePath();                File fileDir = new File(tSDPath,"/SendFileTemp/");                    if (!fileDir.exists()) {                    fileDir.mkdirs();                    }                String path = tSDPath + "/SendFileTemp/"+System.currentTimeMillis()+".zip";                Utils.zipFile(m_strFileFullPath, path);                file = new File(path);

更多压缩技术参考

http://snowolf.iteye.com/blog/465433

0 0