图片和文件传输压缩总结

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