放大图片铺满屏幕代码片段

                // 获取屏幕宽高
                DisplayMetrics displayMetrics = new DisplayMetrics();
                getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);

                BitmapDrawable bitmapDrawable = (BitmapDrawable) iv_image.getDrawable();
                final Bitmap bitmap = bitmapDrawable.getBitmap();

                int bitmapWidth = bitmap.getWidth();
                int bitmapHeight = bitmap.getHeight();
                int w = displayMetrics.widthPixels;
                int h = displayMetrics.heightPixels;
                Log.d("Standard", "w: " + w + ",h: " + h);
                scaleWidth = ((float) w) / bitmapWidth;
                scaleHeight = ((float) h) / bitmapHeight;
                Log.d("Standard", "scaleWidth: " + w + ",scaleHeight: " + h);

                iv_image.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        Matrix matrix = new Matrix();
                        matrix.postScale(scaleWidth, scaleHeight);

                        Bitmap newBitmap = Bitmap.createBitmap(bitmap,
                                0, 0,
                                bitmap.getWidth(), bitmap.getHeight(),
                                matrix, true);
                        iv_image.setImageBitmap(newBitmap);
                    }
                });