图库和全屏 ImageView，将它们放在一起的问题
我会尽量说得清楚。
这里我正在尝试做
一个图像查看器，其中图像将在设备屏幕上尽可能大地显示。 为了这个目的，为了更好的用户体验，我想到了一个 Gallery。 直到一切都OK！
问题
问题是，在我的适配器的 getView 函数中，它仅使用我的图库中第一个图像的 Gallery.LayoutParams 。这意味着，如果第一张图片是风景，第二张图片是肖像，则第二张图片将显示为风景，尺寸与第一张图片相同。我确实重置了 Gallery.LayoutParams 但没关系，它仍然具有第一个 ImageView 的 LayoutParams 。
代码
public View getView(int position, View convertView, ViewGroup parent) {
ImageView im = new ImageView(mContext);
Bitmap bm = BitmapFactory.decodeByteArray(gallery.get(position).mContent, 0, gallery.get(position).mContent.length);
im.setImageBitmap(bm);
int width = 0;
int height = 0;
if (bm.getHeight() < bm.getWidth()) {
width = getWindowManager().getDefaultDisplay().getWidth();
height = bm.getHeight() * width / bm.getWidth();
}
else {
height = getWindowManager().getDefaultDisplay().getHeight();
width = bm.getWidth() * height/ bm.getHeight();
}
Gallery.LayoutParams lp = new Gallery.LayoutParams(width, height);
im.setLayoutParams(lp);
return im;
}
如果你们中有人明白为什么我真的很高兴知道答案，
I will try to be as clear as possible.
Here What I am trying to do
An Image Viewer, where Image would be display as big as they can on the device screen.
For this purspose and for a better user experience, I thought of a Gallery.
Untill there everything is OK!
The problem
The problem is that in the function getView of my Adapter, it uses only the Gallery.LayoutParams of the first Image I have in my Gallery. Which means that if the first picture is a landscape and the second one a portrait the second one will be display as landscape, with the same dimension as the first one. I do reset the Gallery.LayoutParams but it does not matter, it still have the LayoutParams of the first ImageView.
The code
public View getView(int position, View convertView, ViewGroup parent) {
ImageView im = new ImageView(mContext);
Bitmap bm = BitmapFactory.decodeByteArray(gallery.get(position).mContent, 0, gallery.get(position).mContent.length);
im.setImageBitmap(bm);
int width = 0;
int height = 0;
if (bm.getHeight() < bm.getWidth()) {
width = getWindowManager().getDefaultDisplay().getWidth();
height = bm.getHeight() * width / bm.getWidth();
}
else {
height = getWindowManager().getDefaultDisplay().getHeight();
width = bm.getWidth() * height/ bm.getHeight();
}
Gallery.LayoutParams lp = new Gallery.LayoutParams(width, height);
im.setLayoutParams(lp);
return im;
}
If any of you see why I would be really please to know the answer,
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评论（1）
画廊强制所有孩子都具有相同的尺寸。另外，每次调用 getView() 时都会创建一个新视图，这是一个糟糕的主意。当它不为空时，您应该使用convertView。目前 Gallery 中缺少一个功能，因此 ConvertView 始终为 null，但为了在 Android 的未来版本中受益，请无论如何使用 ConvertView。这也是一个很好的做法，您必须在编写的每个适配器中应用它。
Gallery forces all children to have the same size. Also, you are creating a new View every time getView() is called and it's a terrible idea. You should use the convertView when it's not null. There's currently a missing feature in Gallery so convertView is always null, but to benefit from it in a future version of Android, use the convertView anyway. It's also a good practice that you must apply in every Adapter you write.