有关硬件加速器的问题hardwareAccelerated

1

java.lang.OutOfMemoryError: bitmap size exceeds VM budget

01

Bitmap bitmap =

null

;

02

if

(mUseZoomOut || mUseZoomIn) {

03

// decode image size (decode metadata only, not the whole image)

04

o =

new

BitmapFactory.Options();

05

o.inJustDecodeBounds =

true

;

06

stream =

new

FileInputStream(filename);

07

BitmapFactory.decodeStream(stream,

null

, o);

08

stream.close();

09

10

// get original image size

11

int

inWidth =  o.outWidth;

12

int

inHeight = o.outHeight;

13

clog(String.format(

"Original bitmap size: (%dx%d)."

, inWidth, inHeight));

14

15

// get size for pre-resized image

16

o =

new

Options();

17

o.inSampleSize = Math.max(inWidth/targetWidth, inHeight/targetHeight);

18

}

19

20

// decode pre-resized image

21

stream =

new

FileInputStream(filename);

22

// o.inPurgeable = true;

23

bitmap = BitmapFactory.decodeStream(stream,

null

, o);

24

stream.close();

25

clog(String.format(

"Pre-sized bitmap size: (%dx%d)."

, bitmap.getWidth(), bitmap.getHeight()));

1

android:largeHeap=

"true"

1

Whether your application

's processes should be created with a large Dalvik heap. This applies to all processes created for the application. It only applies to the first application
loaded into a process; if you'

re using a shared user ID to allow multiple applications to use a process, they all must use

this

option consistently or they will have unpredictable results.

2

Most apps should not need

this

and should instead focus on reducing their overall memory usage

for

improved performance. Enabling

this

also does not guarantee a fixed increase in available memory, because some devices are constrained by their total available memory.

3

To query the available memory size at runtime, use the methods getMemoryClass() or getLargeMemoryClass().

1

Bitmap too large to be uploaded into a texture exception

1

android:hardwareAccelerated=

"false"

2

3

android:hardwareAccelerated

4

Whether or not hardware-accelerated rendering should be enabled

for

all activities and views in

this

application —

"true"

if

it should be enabled, and

"false"

if

not. The

default

value is

"true"

if

you

've set either minSdkVersion or targetSdkVersion to "14" or higher; otherwise, it'

s

"false"

.

5

Starting from Android

3.0

(API level

11

), a hardware-accelerated OpenGL renderer is available to applications, to improve performance

for

many common 2D graphics operations. When the hardware-accelerated renderer is enabled, most operations in Canvas, Paint, Xfermode, ColorFilter, Shader, and Camera are accelerated. This resultsin smoother animations, smoother scrolling, and improved responsiveness overall, even

for

applications that

do

not explicitly make use the framework's OpenGL libraries.

6

Note that not all of the OpenGL 2D operations are accelerated. If you enable the hardware-accelerated renderer, test your application to ensure that it can make use of the renderer without errors.

7

For more information, read the Hardware Acceleration guide.

1

public

void

drawBitmap (Bitmap bitmap, Rect src, RectF dst, Paint paint)

2

3

public

Bitmap decodeRegion (Rect rect, BitmapFactory.Options options)