Large bitmap compression watermark processing for Android development

Source: Internet
Author: User

We can add a watermark to the image when we tweet or Csdn blog posts. An independent identity, how is that implemented? Encapsulates a Bitmaptools wrapper class first. The problem that this class solves is that a breakthrough is stored in the SDcard, and the image is added to the watermark.


Package Com.example.g11_bitmap04;import;import;import; Import Android.content.res.resources;import;import;import;import;import Android.os.environment;public class BitmapTools { Public Bitmaptools () {//TODO auto-generated constructor stub}public static Bitmap CreateBitmap (Resources resources, int R Esid,string name) {Bitmap Bitmap=bitmapfactory.decoderesource (resources, RESID);//Copy a new Bitmap, Since the watermark operation cannot be performed directly on the original Bitmap//bitmap.config the stored format Bitmap newbitmap=bitmap.copy (Bitmap.Config.ARGB_8888, true);// Canvas canvas=new Canvas (newbitmap) using your own definition canvases; Paint paint=new Paint ();p aint.settextsize (), Canvas.drawtext ("Hello", [+], "paint"),//infer whether SDcard is in the available state if ( Environment.getexternalstoragestate (). Equals (environment.media_mounted)) {//Save the picture directly under the root folder file root= Environment.getexternalstoragedirectory (); OutputStream Outputstream=null;try {outputstream=New FileOutputStream (root, name);//compress the image in PNG format and save it in SDcard newbitmap.compress ( Bitmap.CompressFormat.PNG, OutputStream);} catch (Exception e) {//Todo:handle Exception}}return Newbitmap;}}

This method is called in mainactivtiy

Package Com.example.g11_bitmap04;import Android.os.bundle;import;import;import;import Android.view.view;import Android.widget.Button;import     Android.widget.imageview;public class Mainactivity extends Activity {private ImageView ImageView; Private button button, @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate ); Setcontentview (R.layout.activity_main); imageview= (ImageView) This.findviewbyid (; Button= ( Button) This.findviewbyid (, Button.setonclicklistener (new View.onclicklistener () {@Overridepublic void OnClick (View v) {//TODO auto-generated method Stubbitmap Bitmap=bitmaptools.createbitmap (Getresources (), R.drawable.a , "A.png"); Imageview.setimagebitmap (bitmap);}}); @Overridepublic boolean Oncreateoptionsmenu (Menu menu) {//Inflate the menu; This adds items to the action bar if it is PR Esent.getmenuinflater (). Inflate (, menu); return true;}}

Large bitmap compression watermark processing for Android development

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