Android Good image compression method

<span id="Label3"></p><p style="text-align:center"><p style="text-align:center"><span style="font-size:14px"><strong>Android Good image compression method</strong></span></p></p><p><p><span style="font-size:14px"><br></span></p></p><p><p><span style="font-size:14px; color:#cc0000">first, Image quality Compression</span></p></p><p><p><span style="font-size:14px"></span></p></p><pre code_snippet_id="650206" snippet_file_name="blog_20150422_1_5092879" name="code" class="java"><pre code_snippet_id="650206" snippet_file_name="blog_20150422_1_5092879" name="code" class="java">/** * Mass compression method * * @param image * @return * /public static Bitmap compressimage (Bitmap Image) { C6/>bytearrayoutputstream BAOs = new Bytearrayoutputstream (); Image.compress (Bitmap.CompressFormat.JPEG, baos);//quality compression method, here 100 means no compression, the compressed data stored in the BAOs int options =; While (baos.tobytearray (). length/1024 > 100) {//cycle to determine if the image is larger than 100kb after compression, greater than continue compression Baos.reset ();//reset BAOs to empty baos< C11/>image.compress (Bitmap.CompressFormat.JPEG, options, baos);//compress options% here, Store the compressed data in BAOs options- = 10;/ /reduced by ten } bytearrayinputstream ISBM = new Bytearrayinputstream (baos.tobytearray ());// The compressed data BAOs stored in the Bytearrayinputstream Bitmap Bitmap = bitmapfactory.decodestream (isbm, null, null);// Generate a picture of the Bytearrayinputstream data return bitmap; }</pre></pre><br><br><p><p></p></p><p><p><span style="font-size:14px"><br></span></p></p><p><p><span style="font-size:14px"><span style="color:#cc0000">second, compression by proportional size (path to get pictures)</span></span></p></p><p><p><span style="font-size:14px"></span></p></p><pre code_snippet_id="650206" snippet_file_name="blog_20150422_2_5120971" name="code" class="java">/** * Picture by proportional size compression method * * @param srcpath (get picture According to Path and Compress) * @return * */public static Bitmap getimage (strin G Srcpath) {bitmapfactory.options newopts = new Bitmapfactory.options (); Start to read the picture, at this time set the Options.injustdecodebounds back to true newopts.injustdecodebounds = true; Bitmap Bitmap = bitmapfactory.decodefile (srcpath, Newopts);//return BM At this time is empty newopts.injustdecodebounds = false; int w = newopts.outwidth; int h = newopts.outheight; Now mainstream phone more is 800*480 resolution, so the height and width we set to float hh = 800f;//here Set the height for 800f float ww = 480f;//here set Width to 480f//shrink and the Ratio. Because it is a fixed scale, only one of the data can be calculated as high or wide, int be = 1;//be=1 means not to scale if (w > H && w > Ww) {//if the width is large, the size is fixed Put be = (int) (newopts.outwidth/ww); } else if (w < h && h > Hh) {//if height is high, scale is = (int) (newopts.outheight/hh) according to the fixed width size; } If (be <= 0) is = 1; Newopts.insamplesize = Be;//set IndentZoom In//re-read The picture, Note that at this point the options.injustdecodebounds is set back to false bitmap = Bitmapfactory.decodefile (srcpath, newopts) ; Return Compressimage (bitmap);//compress the proportions and then compress the mass again}</pre><br><br><p><p></p></p><p><p><span style="font-size:14px"><br></span></p></p><p><p><span style="font-size:14px"><span style="color:#cc0000">C. Compression by proportional size (Bitmap)</span></span></p></p><p><p><span style="font-size:14px"></span></p></p><pre code_snippet_id="650206" snippet_file_name="blog_20150422_3_821040" name="code" class="java">/** * Picture by proportional size compression method * * @param image (compressed According to Bitmap Picture) * @return * */public static Bitmap Compressscale (B Itmap image) {bytearrayoutputstream BAOs = new Bytearrayoutputstream (); Image.compress (Bitmap.CompressFormat.JPEG, baos); Determine if the picture is larger than 1M, compress to avoid overflow if (baos.tobytearray () when generating the picture (bitmapfactory.decodestream). length/1024 > 1024) { Baos.reset ();//reset BAOs that is empty BAOs image.compress (Bitmap.CompressFormat.JPEG,, baos);//here Compress 50%, Store the compressed data to BAOs medium} Bytearrayinputstream ISBM = new Bytearrayinputstream (baos.tobytearray ()); Bitmapfactory.options newopts = new Bitmapfactory.options (); Start to read the picture, at this time set the Options.injustdecodebounds back to true newopts.injustdecodebounds = true; Bitmap Bitmap = Bitmapfactory.decodestream (isbm, null, newopts); Newopts.injustdecodebounds = false; int w = newopts.outwidth; int h = newopts.outheight; LOG.I (TAG, W + "---------------" + h); Now the mainstream phone is more 800*480 resolution, so high and wide we set to//float HH = 800f;//here Set the height to 800f//float ww = 480f;//here Set width of 480 F Float hh = 512f; float ww = 512f; Scaling Ratio. Because it is a fixed scale, only one of the data can be calculated as high or wide, int be = 1;//be=1 means not to scale if (w > H && w > Ww) {//if the width is large, the size is fixed Put be = (int) (newopts.outwidth/ww); } else if (w < h && h > Hh) {//if height is high, scale is = (int) (newopts.outheight/hh) According to the height fixed size; } If (be <= 0) is = 1; Newopts.insamplesize = be; Set zoom//newopts.inpreferredconfig = config.rgb_565;//reduce the picture from ARGB888 to RGB565//re-read into the picture, note that the Options.injus is now Tdecodebounds set back false ISBM = new Bytearrayinputstream (baos.tobytearray ()); Bitmap = Bitmapfactory.decodestream (isbm, null, newopts); Return Compressimage (bitmap);//compress The proportion size and then carry on the quality Compression//return bitmap; }</pre><br><br><p><p></p></p><p><p><span style="font-size:14px"><br></span></p></p><p><p>Android Good image compression method</p></p></span>