Android UI-zoomcontrols to zoom in and out images

The zoomcontrols control is a zoomcontrols control that can be scaled but has the following effect:

The following are some of the main methods

Hasfocus (): determines the focus

Hide (): Hide

Ontouchevent (motionevent event): Now this method is used to handle touch screen mobile events.

Setiszoominenabled (Boolean isenabled): whether to allow Amplification

Setiszoomoutenabled (Boolean isenabled): whether to allow downgrading

Setonzoominclicklistener (view. onclicklistener listener): registers a listener for amplification.

Setonzoomoutclicklistener (view. onclicklistener listener): registers the listener for downgrading.

Setzoomspeed (long speed): sets the scaling speed.

Show (): Display

In this case, if you set the setiszoominenabled () method to false, the enlarged button turns gray and cannot be used. In fact, this control is only two buttons, but it only has an appearance, no function. If you want to zoom in or zoom out an image, you still need to implement it in the listener event.

Start viewing code

Main. xml file:

<? XML version = "1.0" encoding = "UTF-8"?>
<Linearlayout xmlns: Android = "http://schemas.android.com/apk/res/android"
Android: Orientation = "vertical"
Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
Android: Id = "@ + ID/layout1"
>
<Imageview
Android: Id = "@ + ID/imgview"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: src = "@ drawable/Yuanyuan"
/>

<Zoomcontrols
Android: Id = "@ + ID/zoomcontrol"
Android: layout_gravity = "bottom"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
/>
</Linearlayout>

 

Zoomexampleactivity. Java file:

Package com. loulijun. zoomcontroltest;

Import Android. App. activity;
Import Android. Graphics. Bitmap;
Import Android. Graphics. bitmapfactory;
Import Android. Graphics. matrix;
Import Android. OS. Bundle;
Import Android. util. displaymetrics;
Import Android. View. view;
Import Android. View. View. onclicklistener;
Import Android. widget. imageview;
Import Android. widget. linearlayout;
Import Android. widget. zoomcontrols;

Public class zoomexampleactivity extends activity {
Private linearlayout layout1;
Private zoomcontrols zoom;
Private imageview IMG;
Private int id = 0;
Private int displaywidth;
Private int displayheight;
Private float scalewidth = 1;
Private float scaleheight = 1;
Private bitmap BMP;
@ Override
Public void oncreate (bundle savedinstancestate ){
Super. oncreate (savedinstancestate );
Setcontentview (R. layout. Main );

Layout1 = (linearlayout) findviewbyid (R. Id. layout1 );
// Obtain the screen resolution size
Displaymetrics dm = new displaymetrics ();
Getwindowmanager (). getdefaultdisplay (). getmetrics (DM );
Displaywidth = DM. widthpixels;
// Screen height minus zoomcontrols height
Displayheight = DM. heightpixels;
BMP = bitmapfactory. decoderesource (getresources (), R. drawable. Yuanyuan );
IMG = (imageview) findviewbyid (R. Id. imgview );
// Zoom. Hide (); hide zoomcontrols
// Zoom. Show (); display zoomcontrols

Zoom = (zoomcontrols) findviewbyid (R. Id. zoomcontrol );
IMG = (imageview) findviewbyid (R. Id. imgview );
Zoom. setiszoominenabled (true );
Zoom. setiszoomoutenabled (true );
// Enlarge the image
Zoom. setonzoominclicklistener (New onclicklistener ()
{
Public void onclick (view V)
{
Int BMP width = BMP. getwidth ();
Int bmpheight = BMP. getheight ();
// Set the zoomed-in ratio of the image
Double scale = 1.25;
// Calculate the scale to be enlarged this time
Scalewidth = (float) (scalewidth * scale );
Scaleheight = (float) (scaleheight * scale );
// Generate new size but bitmap object
Matrix matrix = new matrix ();
Matrix. postscale (scalewidth, scaleheight );
Bitmap resizebmp = bitmap. createbitmap (BMP, 0, 0, BMP width, bmpheight, matrix, true );
IMG. setimagebitmap (resizebmp );

}
});
// Reduce the image size
Zoom. setonzoomoutclicklistener (New onclicklistener ()
{

Public void onclick (view v ){
Int BMP width = BMP. getwidth ();
Int bmpheight = BMP. getheight ();
// Set the zoomed-in ratio of the image
Double scale = 0.8;
// Calculate the scale to be enlarged this time
Scalewidth = (float) (scalewidth * scale );
Scaleheight = (float) (scaleheight * scale );
// Generate new size but bitmap object
Matrix matrix = new matrix ();
Matrix. postscale (scalewidth, scaleheight );
Bitmap resizebmp = bitmap. createbitmap (BMP, 0, 0, BMP width, bmpheight, matrix, true );
IMG. setimagebitmap (resizebmp );
}

});
}
}

 

The effect is as follows: