Android ImageView

android显示图片

1、从res文件下获取图片资源

ImageView  images=(ImageView) findViewById(R.id.imageview1);
InputStream is=this.getResources().openRawResource(R.drawable.test2); 
BitmapFactory.Options options=new BitmapFactory.Options(); 
       options.inJustDecodeBounds = false; 
       options.inSampleSize = 10;   //width，hight设为原来的十分一 
       Bitmap btp =BitmapFactory.decodeStream(is,null,options);
       images.setImageBitmap(btp); 

2、从SD卡下获取图片资源。
提示：在AndroidManifest.xml中加入权限

ImageView  images=(ImageView) findViewById(R.id.imageview1);
String path="/storage/sdcard/images/test2.jpg";
 BitmapFactory.Options option = new BitmapFactory.Options();
     option.inSampleSize = 4;
     Bitmap bm = BitmapFactory.decodeFile(path,option)

获取SD卡根目录:

String path = Environment.getExternalStorageDirectory() + "/"