Android操作系統中對於圖片的操作我們在《Android圖片浏覽源碼解讀》文章中也有所介紹。不過對於圖片的大小調整往往都局限於固定的調整。如何才能滿足動態大小調整呢?我們在這裡就為大家詳細介紹有關Android圖片大小調整的動態實現方法。
昨天,動態獲取圖片資源獲取的很爽啊,後來,換了一張png,128*128的,Run as android application,天哪,居然覆蓋了我大半個屏幕,都不留一點情面給我展示了。。。。看來,必須要找個方法讓圖片自適應大小,於是修改了一下獲取圖片的代碼,讓圖片能自適應。
一下就是Android圖片大小調整的相關代碼示例:
private Bitmap getImageFromAssetFile(String fileName,int how){
Bitmap image = null ;
try {
AssetManager am = game.getAssets();
InputStream is = am.open(fileName);
image = BitmapFactory.decodeStream(is);
is.close();
}catch (Exception e){
}
return zoomImage(image,how);
}
public Bitmap zoomImage(Bitmap bgimage,int how) {
int bmpwidth = bgimage.getWidth();
int bmpheight = bgimage.getHeight();
float scaleWidth=0;
float scaleHeight=0;
Matrix matrix = new Matrix();
if(how==0){
scaleWidth = ((float) width) / bmpwidth;
scaleHeight = ((float) height) / bmpheight;
}else{
scaleWidth=Math.min(width,height)/bmpwidth;
scaleHeight=Math.min(width, height)/bmpheight;
}
private Bitmap getImageFromAssetFile(String fileName,int how){
Bitmap image = null ;
try {
AssetManager am = game.getAssets();
InputStream is = am.open(fileName);
image = BitmapFactory.decodeStream(is);
is.close();
}catch (Exception e){
}
return zoomImage(image,how);
}
public Bitmap zoomImage(Bitmap bgimage,int how) {
int bmpwidth = bgimage.getWidth();
int bmpheight = bgimage.getHeight();
float scaleWidth=0;
float scaleHeight=0;
Matrix matrix = new Matrix();
if(how==0){
scaleWidth = ((float) width) / bmpwidth;
scaleHeight = ((float) height) / bmpheight;
}else{
scaleWidth=Math.min(width,height)/bmpwidth;
scaleHeight=Math.min(width, height)/bmpheight;
}
其中,scaleWidth和scaleHeight是欲縮放後的大小,這裡加個參數how是防止有不需要縮放的情況~
Android圖片大小調整的操作方法就為大家介紹到這裡。