Android 用zoom放大缩小图片

2024年3月9日发(作者：)

用zoom放大缩小图片

import ty;

import ;

public class zooming extends Activity {

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle icicle) {

te(icicle);

setContentView(new Zoom(this));

}

}

import t;   
import ;   
import le;   
import nt;   
import ;   
    
public class Zoom extends View {   
        private Drawable image;   
        private int zoomControler=20;    
        public Zoom(Context context)   
        {   
                super(context);   
                image=ources().getDrawable();   
                setFocusable(true);   
                   
        }   
        @Override   
        protected void onDraw(Canvas canvas) {   
                // TODO Auto-generated method stub   
                (canvas);   
        //here u can control the width and height of  this line is very important   
        nds((getWidth()/2)-zoomControler, (getHeight()/2)-zoomControler, (getWidth(
)/2)+zoomControler, (getHeight()/2)+zoomControler);   
                (canvas);   
        }   
        @Override   
        public boolean onKeyDown(int keyCode, KeyEvent event) {   
                   
                if(keyCode==E_DPAD_UP)// zoom in   
                        zoomControler+=10;   
                if(keyCode==E_DPAD_DOWN) // zoom out   
                        zoomControler-=10;   
                if(zoomControler<10)   
                        zoomControler=10;   
                   
                invalidate();   
                return true;   
        }   
}   
    
 
 
 
 
package _Gallery; 
  
import ty; 
import ; 
import Factory; 
import ; 
import ; 
import ; 
import yMetrics; 
import ; 
import eDetector; 
import nt; 
import Event; 
import ; 
import ureListener;
import hListener; 
import ; 
import ayout; 
import iew; 
import Layout; 
import ; 
  
public class DisplayImage extends Activity 
OnTouchListener, OnGestureListener  { 
 private static final String TAG = "DisplayImage"; 
 private static final int FLING_MIN_DISTANCE = 100; 
 private static final int FLING_MIN_VELOCITY = 200; 
  
  
 /* 
相关变量声明
 */ 
 private ImageView mImageView; 
 private Button mButton01; 
implements