Android image editing and processing (iv)

Compositing by drawing a bitmap object on the Canvas object and then drawing a second image on the same canvas. The difference is that when you draw a second image, you need to specify a transition mode (Xfermode) on the Paint object.

The sample code is as follows:

Package Com.example.testphotoedit;import Java.io.filenotfoundexception;import Android.app.activity;import Android.content.intent;import Android.graphics.bitmap;import Android.graphics.bitmapfactory;import Android.graphics.canvas;import Android.graphics.paint;import Android.graphics.porterduffxfermode;import Android.net.uri;import Android.os.bundle;import Android.view.display;import Android.view.view;import Android.view.view.onclicklistener;import Android.widget.button;import Android.widget.imageview;public Class Picturecomposite extends Activity implements Onclicklistener {private Button bt1, bt2;private ImageView Composite; private static final int picked_one = 1;private static final int picked_two = 2;private static Boolean Onepicked=false;pri Vate Static Boolean twopicked=false;private Bitmap bmp1,bmp2; @Overrideprotected void OnCreate (Bundle Savedinstancestate) {//TODO auto-generated method Stubsuper.oncreate (savedinstancestate); Setcontentview ( R.layout.activity_main); bt1 = (Button) FIndviewbyid (r.id.picture_1); bt2 = (Button) Findviewbyid (r.id.picture_2); composite = (ImageView) Findviewbyid ( R.id.composite_all); Bt1.setonclicklistener (this), Bt2.setonclicklistener (this);} @Overridepublic void OnClick (View v) {//TODO auto-generated method Stubint which = -1;switch (V.getid ()) {case R.ID.PICTU Re_1:which = Picked_one;break;case R.id.picture_2:which = picked_two;break;} Intent Intent = new Intent (Intent.action_pick,android.provider.mediastore.images.media.external_content_uri); Startactivityforresult (Intent, which);} @Overrideprotected void Onactivityresult (int requestcode, int resultcode, Intent data) {//TODO auto-generated method stub Super.onactivityresult (Requestcode, ResultCode, data); if (ResultCode = = RESULT_OK) {Uri Imagefileuri = Data.getdata (); if (requestcode==picked_one) {bmp1=loadbitmap (Imagefileuri); onepicked=true;} else if (requestcode==picked_two) {bmp2=loadbitmap (Imagefileuri); twopicked=true;}} If two images are selected and two bitmaps have been instantiated, continue the compositing operation if (onepicked&&twopicked) {Bitmap ALteredbitmap = Bitmap.createbitmap (Bmp1.getwidth (), Bmp1.getheight (), Bmp1.getconfig ());//Create an empty bitmap object, Size and configuration same as the first bitmap object (BMP1) Canvas canvas=new canvas (ALTEREDBITMAP); Paint paint=new paint (); Canvas.drawbitmap (bmp1, 0, 0, paint);p Aint.setxfermode (New Porterduffxfermode ( Android.graphics.PorterDuff.Mode.MULTIPLY));//Instantiate Object Canvas.drawbitmap (bmp2, 0, 0, paint); Composite.setimagebitmap ( ALTEREDBITMAP);}} @SuppressWarnings ("deprecation") Private Bitmap LoadBitmap (Uri imagefileuri) {Display currentdisply = Getwindowmanager (). Getdefaultdisplay (); int dw = Currentdisply.getwidth ()/2-100;int DH = currentdisply.getheight ()/2-100;try {Bitma Pfactory.options bmpfactory = new Bitmapfactory.options () Bmpfactory.injustdecodebounds = true;//Load the dimensions of the image rather than the image itself bitmap BMP = Bitmapfactory.decodestream (Getcontentresolver (). Openinputstream (Imagefileuri), NULL, bmpfactory); int HeightRatio = (int) Math.ceil (Bmpfactory.outheight/(float) DH), int widthRatio = (int) Math.ceil (Bmpfactory.outwidth/(f loat) DW); if (heightRatio > 1 && widthRatio > 1) {if (HeightRatio > WidthRatio) {bmpfactory.insamplesize = HeightRatio;} else {bmpfactory.insamplesize = WidthRatio;}} Bmpfactory.injustdecodebounds = false;//Loads the real image bmp = Bitmapfactory.decodestream (Getcontentresolver (). Openinputstream (Imagefileuri), NULL, bmpfactory); return bmp;} catch (FileNotFoundException e) {//TODO auto-generated catch Blocke.printstacktrace (); return null;}}}

Activity_main.xml file:

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "    android:layout_width=" match_parent "    android:layout_height=" Match_parent " >    <button         android:id= "@+id/picture_1"        android:layout_width= "match_parent"        android:layout _height= "50DP"        android:text= "Choose Picture1"/>    <button         android:id= "@+id/picture_2"        Android:layout_width= "Match_parent"        android:layout_height= "50DP"        android:layout_below= "@+id/picture_ 1 "        android:text=" Choose Picture2 "/>    <imageview         android:id=" @+id/composite_all "        android:layout_below= "@+id/picture_2"        android:layout_width= "wrap_content"        android:layout_height= " Wrap_content "        android:layout_margintop=" 5DP "        android:contentdescription=" @null "/></ Relativelayout>

The results of the operation are as follows:

Android image editing and processing (iv)