目前我正在研究文件浏览器。一切正常,但有一个例外:如果用户单击图像(jpg、png、bmp、..),我希望图像显示在与图像大小相同的对话框或弹出窗口中 - 这样根本没有边界。图像文件位于 SD 卡上。
这是我到目前为止所拥有的:
BitmapDrawable bitmap = new BitmapDrawable(context.getResources(), TARGET_PATH);
AlertDialog.Builder imageDialog = new AlertDialog.Builder(context);
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View layout = inflater.inflate(R.layout.thumbnail, null);
ImageView image = (ImageView) layout.findViewById(R.id.thumbnail_IMAGEVIEW);
image.setImageDrawable(bitmap);
imageDialog.setView(layout);
imageDialog.create();
imageDialog.show();
XML 文件:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<ImageView
android:id="@+id/thumbnail_IMAGEVIEW"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:contentDescription="@string/icon_DESCRIPTION" />
</RelativeLayout>
这是输出:
图像边缘有丑陋的边框 - 我不希望显示它们。我尝试了很多在谷歌等中列出的东西和例子。 - 还没有任何效果。
最好的选择是使图像后面的对话框/视图与图像大小相同。另一种方法可能是将图像背后的背景设置为透明。
我如何实现任何解决方案?我想让背景与图像的大小相同,所以没有“不可见”的东西留下,但我也可以使用透明选项。
解决方案:
// Get screen size
Display display = context.getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int screenWidth = size.x;
int screenHeight = size.y;
// Get target image size
Bitmap bitmap = BitmapFactory.decodeFile(TARGET);
int bitmapHeight = bitmap.getHeight();
int bitmapWidth = bitmap.getWidth();
// Scale the image down to fit perfectly into the screen
// The value (250 in this case) must be adjusted for phone/tables displays
while(bitmapHeight > (screenHeight - 250) || bitmapWidth > (screenWidth - 250)) {
bitmapHeight = bitmapHeight / 2;
bitmapWidth = bitmapWidth / 2;
}
// Create resized bitmap image
BitmapDrawable resizedBitmap = new BitmapDrawable(context.getResources(), Bitmap.createScaledBitmap(bitmap, bitmapWidth, bitmapHeight, false));
// Create dialog
Dialog dialog = new Dialog(context);
dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
dialog.setContentView(R.layout.thumbnail);
ImageView image = (ImageView) dialog.findViewById(R.id.imageview);
// !!! Do here setBackground() instead of setImageDrawable() !!! //
image.setBackground(resizedBitmap);
// Without this line there is a very small border around the image (1px)
// In my opinion it looks much better without it, so the choice is up to you.
dialog.getWindow().setBackgroundDrawable(null);
// Show the dialog
dialog.show();
XML 文件:
<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/imageview"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ImageView>
最终输出: