Images and photos zoom in/out

 

以下内容Sinfrancis版权所有，专注请注明来自  http://mdev.cc/dev

 

Hi ben, it is very easy to Zoom in and zoom out Images. take a look here 
using UP and Down Arrow keys , u can zoom in and zoom out the images.

 

zooming.java

 

import android.app.Activity; 
import android.os.Bundle; 

public class zooming extends Activity { 
    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle icicle) { 
        super.onCreate(icicle); 
        setContentView(new Zoom(this)); 
    } 
}

 Zoom.java

 

import android.content.Context; 
import android.graphics.Canvas; 
import android.graphics.drawable.Drawable; 
import android.view.KeyEvent; 
import android.view.View; 

public class Zoom extends View { 
     private Drawable image; 
     private int zoomControler=20; 
     public Zoom(Context context) 
     { 
          super(context); 
          image=context.getResources().getDrawable(R.drawable.icon); 
          setFocusable(true); 
           
     } 
     @Override 
     protected void onDraw(Canvas canvas) { 
          // TODO Auto-generated method stub 
          super.onDraw(canvas); 
     //here u can control the width and height of the images........ this line is very important 
     image.setBounds((getWidth()/2)-zoomControler, (getHeight()/2)-zoomControler,(getWidth()/2)+zoomControler, (getHeight()/2)+zoomControler); 
          image.draw(canvas); 
     } 
     @Override 
     public boolean onKeyDown(int keyCode, KeyEvent event) { 
           
          if(keyCode==KeyEvent.KEYCODE_DPAD_UP)// zoom in 
               zoomControler+=10; 
          if(keyCode==KeyEvent.KEYCODE_DPAD_DOWN) // zoom out 
               zoomControler-=10; 
          if(zoomControler<10) 
               zoomControler=10; 
           
          invalidate(); 
          return true; 
     } 
}