android.graphics.Bitmap
public final class Bitmap extends Object implements Parcelable
方法:
public boolean compress //压缩,压紧 (Bitmap.CompressFormat format, int quality//质量, OutputStream stream)
Added in API level 1
Write a compressed version of the bitmap to the specified outputstream. If this returns true, the bitmap can be reconstructed//重建的,改造的 by passing a corresponding //相应的,一致的inputstream to BitmapFactory.decodeStream(). Note: not all Formats support all bitmap configs//配置 directly, so it is possible that the returned bitmap from BitmapFactory could be in a different bitdepth, and/or may have lost per-pixel alpha (e.g. JPEG only supports opaque//不透明 pixels).
Parameters
| format | The format of the compressed image |
|---|---|
| quality | Hint to the compressor, 0-100. 0 meaning compress for small size, 100 meaning compress for max quality. Some formats, like PNG which is lossless//无损的, will ignore//忽略 the quality setting |
| stream | The outputstream to write the compressed data. |
Returns
- true if successfully compressed to the specified stream.