android-destroyDrawingCache

destroyDrawingCache

Added in API level 1

void destroyDrawingCache ()

Frees the resources used by the drawing cache. If you call 

buildDrawingCache()

 manually
without calling 

setDrawingCacheEnabled(true)

, you should cleanup
the cache with this method afterwards.释放的资源使用的绘图缓存。如果你调用buildDrawingCache()手动没有调用setDrawingCacheEnabled(真正的),你应该清理缓存使用此方法。

See also:

setDrawingCacheEnabled(boolean)

buildDrawingCache()

getDrawingCache()

setDrawingCacheEnabled

Added in API level 1

void setDrawingCacheEnabled (boolean enabled)

Enables or disables the drawing cache. When the drawing cache is enabled, the next call to 

getDrawingCache()

 or 

buildDrawingCache()

 will
draw the view in a bitmap. Calling 

draw(android.graphics.Canvas)

 will
not draw from the cache when the cache is enabled. To benefit from the cache, you must request the drawing cache by calling 

getDrawingCache()

 and
draw it on screen if the returned bitmap is not null.启用或禁用绘图缓存。启用绘图缓存时,下一个调用getDrawingCache()或buildDrawingCache()将一个位图中的视图。调用画(android.graphics.Canvas)不会从缓存启用缓存时。从缓存中获益,您必须请求绘图缓存通过调用getDrawingCache()和画在屏幕上返回的位图(如果不为空。

Enabling the drawing cache is similar to 

setting a layer

 when
hardware acceleration is turned off. When hardware acceleration is turned on, enabling the drawing cache has no effect on rendering because the system uses a different mechanism for acceleration which ignores the flag. If you want to use a Bitmap for the view,
even when hardware acceleration is enabled, see 

setLayerType(int,
android.graphics.Paint)

 for information on how to enable software and hardware layers.使绘图缓存类似于当关闭硬件加速设置一层。当开启硬件加速,使绘图缓存对渲染,因为没有影响系统使用不同的机制来加速它忽略了国旗。如果你想使用一个位图的观点,即使启用硬件加速,看到setLayerType(int,android.graphics.Paint)如何启用软件和硬件层的信息。

This API can be used to manually generate a bitmap copy of this view, by setting the flag to 

true

 and calling 

getDrawingCache()

.

Parameters
enabled	boolean : true to enable the drawing cache, false otherwise

See also:

isDrawingCacheEnabled()

getDrawingCache()

buildDrawingCache()

setLayerType(int, android.graphics.Paint)

isDrawingCacheEnabled

Added in API level 1

boolean isDrawingCacheEnabled ()

Indicates whether the drawing cache is enabled for this view.显示绘图缓存是否支持这一观点。

Returns
boolean	true if the drawing cache is enabled

See also:

setDrawingCacheEnabled(boolean)

getDrawingCache()

buildDrawingCache

Added in API level 1

void buildDrawingCache ()

Calling this method is equivalent to calling 

buildDrawingCache(false)

.调用该方法相当于调用buildDrawingCache(假)。

See also:

buildDrawingCache(boolean)

getDrawingCache

Added in API level 1

Bitmap getDrawingCache ()

Calling this method is equivalent to calling 

getDrawingCache(false)

.

Returns
Bitmap	A non-scaled bitmap representing this view or null if cache is disabled.

See also:

getDrawingCache(boolean)