您当前的位置: 确认ImageView的图片是否加载成功
本文地址：http://blog.csdn.net/caroline_wendy
判断ImageView图片是否存在，未加载成功，就显示默认图片。
if (mPhotoView.getDrawable() == null) {
// Toast.makeText(getActivity(), "图片加载失败", Toast.LENGTH_SHORT).show();
mPhotoView.setImageDrawable(getResources().getDrawable(R.drawable.icon_default_user_photo));
}Android中Bitmap, Drawable, Byte,ID之间的转化
1. Bitmap 转化为 byte
2. byte转化为bitmap
3. bitmap转化为Drawable
4. Drawable转化为bitmap
a. BitmapDrawable, FastBitmapDrawable直接用getBitmap
b. 其他类型的Drawable用Canvas画到一个bitmap上
5.id转化graphic.drawable
6.id转化成Bitmap
ByteArrayOutputStream out = new ByteArrayOutputStream(); bitmap.compress(Bitmap.CompressFormat.PNG, 100, out); byte[] array= out.toByteArray();
2. byte转化为bitmap
Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
3. bitmap转化为Drawable
Drawable drawable = new FastBitmapDrawable(bitmap);
4. Drawable转化为bitmap
a. BitmapDrawable, FastBitmapDrawable直接用getBitmap
b. 其他类型的Drawable用Canvas画到一个bitmap上
Canvas canvas = new Canvas(bitmap)
drawable.draw(canvas)5.id转化graphic.drawable
Drawable drawable = activity.getResources().getDrawable(R.drawable.icon);
6.id转化成Bitmap
Bitmap bitmap = BitmapFactory. decodeResource (Resources res, int id)
