Android图片大小调整动态实现方法
Android操作系统中对于图片的操作我们在以前的文章中也有所介绍。不过对于图片的大小调整往往都局限于固定的调整。如何才能满足动态大小调整呢？我们在这里就为大家详细介绍有关Android图片大小调整的动态实现方法。
昨天，动态获取图片资源获取的很爽啊，后来，换了一张png，128*128的，Run as android application，天哪，居然覆盖了我大半个屏幕，都不留一点情面给我展示了。。。。看来，必须要找个方法让图片自适应大小，于是修改了一下获取图 片的代码，让图片能自适应。
一下就是Android图片大小调整的相关代码示例：
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- 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是欲缩放后的大小，这里加个参数how是防止有不需要缩放的情况~
