Android image editing and processing (i)

<span id="Label3"></p><p><p>1. Select an image using the built-in gallery application:</p></p><p><p></p></p><pre name="code" class="java"></pre><pre name= "code" class= "java" >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.matrix;import Android.graphics.paint;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 Mainactivity extends Activity implements Onclicklistener {private ImageView chosenimageview,copypicture;private Button choosepicture;private Uri imagefileuri; @Overrideprotected void onCreate (Bundle Savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview ( R.layout.fragment_main) choosepicture = (Button) Findviewbyid (r.id.button_chose); chosenimageview = (ImageView) Findviewbyid (r.id.chose_picture); copypicture= (ImageView) findviewbYid (r.id.copy_picture); Choosepicture.setonclicklistener (this);} @Overridepublic void OnClick (View v) {//TODO auto-generated method stubif (v.getid () = = R.id.button_chose) {Intent Choose Intent = new Intent (intent.action_pick,android.provider.mediastore.images.media.external_content_uri);// Launch Gallery application Startactivityforresult (chooseintent, 0);}}</pre><pre name="code" class="java"><pre name="code" class="java"></pre></pre><pre name="code" class="java"><pre name="code" class="java">/* (non-javadoc) * @see android.app.activity#onactivityresult (int, int, android.content.Intent) * * in the intent data returned, Returns the URI of the selected image */@Overrideprotected void onactivityresult (int requestcode, int resultcode, Intent data) {//TODO Auto-genera Ted Method Stubsuper.onactivityresult (requestcode, resultcode, data); if (resultcode = = Result_ok) {imagefileuri = Data.getdata ();D isplay currentdisply = Getwindowmanager (). getdefaultdisplay (); int dw = Currentdisply.getwidth ()/2- 100;int DH = currentdisply.getheight ()/2-100;</pre></pre><pre name="code" class="java"><pre name="code" class="java"><span style= "font-family:arial, Helvetica, sans-serif;" >try {</span></pre></pre><p><p></p></p><pre name="code" class="java"><pre name="code" class="java">Bitmapfactory.options bmpfactory = new Bitmapfactory.options (); bmpfactory.injustdecodebounds = true;// The size of the image is loaded 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/(float) dw); If (heightratio > 1 && widthRatio > 1) {if (heightratio > WidthRatio) {b Mpfactory.insamplesize = heightratio;} else {bmpfactory.insamplesize = widthRatio;}} Bmpfactory.injustdecodebounds = false;//loads the real image bmp = Bitmapfactory.decodestream (getcontentresolver (). Openinputstream (imagefileuri), null, bmpfactory); chosenimageview.setimagebitmap (bmp);} Catch (filenotfoundexception e) {//TODO auto-generated catch Blocke.printstacktrace ();}}}</pre></pre><p><p></p></p><p><p><br></p></p>2. Plotting bitmaps on bitmap<p><p></p></p><pre name="code" class="java"><pre name="code" class="java">bitmap alteredbitmap = bitmap.createbitmap (bmp.getwidth (), bmp.getwidth (), Bmp.getconfig ()); Canvas Canvas=new Canvas (alteredbitmap); Paint paint=new paint (); canvas.drawbitmap (bmp, 0,0, paint); copypicture.setimagebitmap (alteredbitmap); </pre></pre><pre name="code" class="html"><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 "android:paddi ngbottom= "@dimen/activity_vertical_margin" android:paddingleft= "@dimen/activity_horizontal_margin" android: paddingright= "@dimen/activity_horizontal_margin" android:paddingtop= "@dimen/activity_vertical_margin" tools: context= "com.example.testphotoedit.mainactivity$placeholderfragment" > <button android:id= "@+id/button_ch OSE "android:layout_width=" 120DP "android:layout_height=" 60dp "android:text=" Select Picture "/> <im Ageview android:id= "@+id/chose_picture" android:layout_below= "@+id/button_chose" android:layout_width = "wrap_content" android:layout_height= "wrap_content"/> <imageview android:id= "@+id/copy_picture" android:layout_below= "@+id/chose_picture" AndroiD:layout_width= "wrap_content" android:layout_height= "wrap_content"/></relativelayout> </pre><br>Note: What you do not understand can leave a message.<br><br><br><p><p></p></p><p><p>Android image editing and processing (i)</p></p></span>