问题描述

目前我正在使用文件浏览器.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 - 这样就没有边框了.图像文件位于 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.

这是我目前所拥有的:

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 - 我不希望它们显示出来.我尝试了很多在 google 等中列出的东西和示例. - 还没有任何效果.

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.另一种方法是将图像背后的背景设置为透明.

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.

如何实现任何解决方案?我想让背景与图像的大小相同，因此不会留下不可见"的东西，但我也可以使用透明选项.

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:

推荐答案

从这里改变你的 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" />

到这里:

<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" />

希望这会有所帮助.

这篇关于Android Image Dialog/Popup 与图像大小相同且无边框的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！