CODEWITHSUNDEEP
javaandroid
jquery404
jquery404

Reputation: 674

How to get ImageView Size in Android?

Im trying to get imageview size but its returning zero. i know its because im calling it in onCreate(). can anyone help me how to do this so that when I will click a button it will show me the size of that ImageView. here what i have tried so far...

    @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

            btn = (Button)findViewById(R.id.btn);
            imgView = (ImageView)findViewById(R.id.imgView);        

            btn.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    getSize();              
                }
            });

        }

void getSize)
    {
        BitmapDrawable bd = (BitmapDrawable)imgView.getDrawable();
        bmp = bd.getBitmap();           
        Bitmap op = Bitmap.createBitmap(bmp, imgWidth/2, imgHeight/2, imgWidth, imgHeight);

        imgView.setImageBitmap(op);     
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus){
        imgWidth=imgView.getWidth();
        imgHeight=imgView.getHeight();
    }

UPDATE

This is what I am getting right now...

06-18 00:13:20.206: E/AndroidRuntime(919): FATAL EXCEPTION: main
06-18 00:13:20.206: E/AndroidRuntime(919): java.lang.IllegalArgumentException: x must be >= 0
06-18 00:13:20.206: E/AndroidRuntime(919):  at android.graphics.Bitmap.checkXYSign(Bitmap.java:225)
06-18 00:13:20.206: E/AndroidRuntime(919):  at android.graphics.Bitmap.createBitmap(Bitmap.java:495)
06-18 00:13:20.206: E/AndroidRuntime(919):  at android.graphics.Bitmap.createBitmap(Bitmap.java:471)
06-18 00:13:20.206: E/AndroidRuntime(919):  at com.example.bitmapfun.Main.Gray(Main.java:44)
06-18 00:13:20.206: E/AndroidRuntime(919):  at com.example.bitmapfun.Main$1.onClick(Main.java:34)
06-18 00:13:20.206: E/AndroidRuntime(919):  at android.view.View.performClick(View.java:3527)
06-18 00:13:20.206: E/AndroidRuntime(919):  at android.view.View$PerformClick.run(View.java:14234)
06-18 00:13:20.206: E/AndroidRuntime(919):  at android.os.Handler.handleCallback(Handler.java:605)
06-18 00:13:20.206: E/AndroidRuntime(919):  at android.os.Handler.dispatchMessage(Handler.java:92)
06-18 00:13:20.206: E/AndroidRuntime(919):  at android.os.Looper.loop(Looper.java:137)
06-18 00:13:20.206: E/AndroidRuntime(919):  at android.app.ActivityThread.main(ActivityThread.java:4441)
06-18 00:13:20.206: E/AndroidRuntime(919):  at java.lang.reflect.Method.invokeNative(Native Method)
06-18 00:13:20.206: E/AndroidRuntime(919):  at java.lang.reflect.Method.invoke(Method.java:511)
06-18 00:13:20.206: E/AndroidRuntime(919):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
06-18 00:13:20.206: E/AndroidRuntime(919):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
06-18 00:13:20.206: E/AndroidRuntime(919):  at dalvik.system.NativeStart.main(Native Method)

Upvotes: 0

Views: 210

Answers (2)

Sanjay Manohar
Sanjay Manohar

Reputation: 7026

The size isn't set up until the component is added to the parent window, and then the window is "packed" or laid out to the right size. So in the onCreate, it will be 0,0

Can't you just get the size when the function is called? 

void getSize()
    {
      imgWidth=imgView.getWidth();
      imgHeight=imgView.getHeight();
      BitmapDrawable bd = (BitmapDrawable)imgView.getDrawable();
      bmp = bd.getBitmap();           
      Bitmap op = Bitmap.createBitmap(bmp, imgWidth/2, imgHeight/2, imgWidth, imgHeight);

      imgView.setImageBitmap(op);     
    }

Upvotes: 0

Illegal Argument
Illegal Argument

Reputation: 10348

Try this it uses view tree observer for getting the width and height. The earlier methods didnot work because the view was not drawn in the screen(layout pass incomplete). Something similar should work:

final ImageView iv = (ImageView)findViewById(R.id.image);
ViewTreeObserver vto = iv.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
       Log.d("width",""+iv.getWidth());
    }
});

Upvotes: 1

Related Questions