問(wèn)題描述

目前我正在使用文件瀏覽器.一切正常，但有一個(gè)例外:如果用戶單擊圖像(jpg，png，bmp，..)，我希望圖像顯示在與圖像大小相同的對(duì)話框或彈出窗口中 - 這樣就沒(méi)有邊框了.圖像文件位于 sdcard 上.

At the moment I am working on a file browser. Everything works fine with one exception: If the user clicks on an image (jpg, png, bmp, ..), I want the image to be displayed in a dialog or in a popup which has the same size as the image - so that there are no borders at all. The image files are located on the sdcard.

這是我目前所擁有的:

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>

這是輸出:

圖像邊緣有丑陋的邊框 - 我不希望它們顯示出來(lái).我嘗試了很多在 google 等中列出的東西和示例. - 還沒(méi)有任何效果.

There are ugly borders at the edges of the images - I don't want them to be shown. I tried lots of stuff and examples listed in google, etc.. - nothing worked yet.

最好的選擇是使圖像后面的對(duì)話框/視圖與圖像大小相同.另一種方法是將圖像背后的背景設(shè)置為透明.

The best option will be to make the dialog/the view behind the image, the same size as the image. Another way could be to set the background behind the image transparent.

如何實(shí)現(xiàn)任何解決方案?我想讓背景與圖像的大小相同，因此不會(huì)留下不可見(jiàn)"的東西，但我也可以使用透明選項(xiàng).

How do I achieve any solution? I'd love to make the background the same size as the image is, so there is no "invisible" stuff left, but I will also be okay with the transparent option.

解決方案:

// 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>

最終輸出:

推薦答案

從這里改變你的 ImageView:

Change your ImageView from this:

<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" />

到這里:

<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:adjustViewBounds="true" <!-- Here is the thing -->
        android:contentDescription="@string/icon_DESCRIPTION" />

希望這會(huì)有所幫助.

這篇關(guān)于Android Image Dialog/Popup 與圖像大小相同且無(wú)邊框的文章就介紹到這了，希望我們推薦的答案對(duì)大家有所幫助，也希望大家多多支持html5模板網(wǎng)！