Android Single Touch mobile, multi-touch Zoom Out

Activity_main.xml:

<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"Tools:context=". Mainactivity"> <ImageView Android:id="@+id/imgage"android:src="@drawable/liying"Android:layout_width="wrap_content"Android:layout_height="wrap_content"Android:layout_centerhorizontal="true"android:layout_centervertical="true"/></relativelayout>

Mainactivity.class:

Package Com.example.day4_one;import android.os.bundle;import android.app.activity;import android.view.Menu; Import Android.app.activity;import Android.content.res.resources;import Android.util.displaymetrics;import Android.util.log;import Android.view.menu;import Android.view.motionevent;import Android.view.View;import Android.view.view.ontouchlistener;import Android.widget.imageview;import Android.widget.relativelayout;import Android.widget.Toast; Public classMainactivity extends Activity {PrivateImageView image; floatLastdistance =-1; floatx0 =0; floatY0 =0; Private intScreenWidth; Private intScreenHeight; @Overrideprotected voidonCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);                Setcontentview (R.layout.activity_main); Image=(ImageView) Findviewbyid (r.id.imgage); //get the screen width high to keep out of boundsDisplaymetrics DM =getresources (). Getdisplaymetrics (); ScreenWidth=Dm.widthpixels; ScreenHeight= dm.heightpixels- -; Image.setontouchlistener (NewOntouchlistener () {Private floatx; Private floaty; @Override PublicBoolean OnTouch (View v,final motioneventEvent) {                //TODO auto-generated Method Stub                intAction =Event. Getaction (); LOG.I ("TAG","Touch Start ..."); Switch(action) { CaseMotionevent.action_down://GetX () is the x-coordinate of the widget relative to its upper-left corner, and Getrawx () is the x-coordinate value relative to the upper-left corner of the screen (note: The upper-left corner of the screen is the upper-left corner of the phone screen, regardless of whether the activity is titlebar or full screen) x =Event. GETRAWX (); Y=Event. GETRAWX ();  Break;  CaseMotionevent.action_move://get the number of touch points                    intCount =Event. Getpointercount (); LOG.I ("TAG","number of touch points:"+count); if(Count >1) {log.i ("TAG",Event. GetX (0)+","+Event. GetY (0)+"|"+Event. GetX (1)+","+Event. GetY (1)); //get two points of coordinate difference                        floatDistancex =Event. GetX (0) -Event. GetX (1); floatDistancey =Event. GetY (0) -Event. GetY (1); //get the distance between two points                        floatBetweendistance = (float) math.sqrt (Distancex*distancex + distancey*Distancey); LOG.I ("TAG","new distance between the current two points:"+betweendistance); if(Betweendistance <1) {lastdistance=betweendistance; }Else if((betweendistance-lastdistance) >5){                            //Zoom inLastdistance =betweendistance; //Get layout ParametersRelativelayout.layoutparamsparams=(Android.widget.RelativeLayout.LayoutParams) image.getlayoutparams (); params. Width = (int) (Image.getwidth () *1.1f); params. Height = (int) (Image.getheight () *1.1f); Image.setlayoutparams (params); }Else if((lastdistance-betweendistance) >5) {lastdistance=betweendistance; //Get layout ParametersRelativelayout.layoutparamsparams=(Android.widget.RelativeLayout.LayoutParams) image.getlayoutparams (); params. Width = (int) (Image.getwidth () *0.9f); params. Height = (int) (Image.getheight () *0.9f); Image.setlayoutparams (params); }                                            }Else if(Count = =1){                                                //Moving Distance                        floatRAWX =Event. GETRAWX ()-x; floatRawy =Event. Getrawy ()-y; //Define a new                        intleft = (int) (Image.getleft () +rawx); inttop = (int) (Image.gettop () +Rawy); intright = (int) (Image.getright () +rawx); intBottom = (int) (Image.getbottom () +Rawy); //setting cannot be out of bounds                          if(Left <0) { left=0; Right= left +v.getwidth (); }                                      if(Right >screenwidth) { Right=ScreenWidth; Left= Right-v.getwidth (); }                                      if(Top <0) {Top=0; Bottom= Top +v.getheight (); }                                      if(Bottom >screenheight) {Bottom=ScreenHeight; Top= Bottom-v.getheight (); }                                                                         //Assign ValueImage.layout (left, top, right, bottom); //Change to a new labelx=Event. GETRAWX (); Y=Event. Getrawy (); /*return false;*/                    }                     Break; }                                return true;    }        }); }    //Global Move@Override PublicBoolean ontouchevent (motioneventEvent) {    //TODO auto-generated Method Stub      /*Image.setx (Event.getx ()); Image.sety (Event.gety ()); */    return true;} }

Android Single Touch mobile, multi-touch Zoom Out