使用ImageView显示AlertDialog,不带任何填充

Question

编辑 - 解决方案:

我最终找到了解决这个问题的方法.因为手动更改ImageView的高度会删除额外的填充,所以我最终找到了原始图像的尺寸,并在计算出ImageView尺寸后将它们应用到ImageView.这是最终结果:

这是最终的工作代码:

AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setPositiveButton("Get Pro", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
            }
        }).setNegativeButton("No thanks", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
            }
        });
        final AlertDialog dialog = builder.create();
        LayoutInflater inflater = getLayoutInflater();
        View dialogLayout = inflater.inflate(R.layout.go_pro_dialog_layout, null);
        dialog.setView(dialogLayout);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);

        dialog.show();

        dialog.setOnShowListener(new DialogInterface.OnShowListener() {
            @Override
            public void onShow(DialogInterface d) {
                ImageView image = (ImageView) dialog.findViewById(R.id.goProDialogImage);
                Bitmap icon = BitmapFactory.decodeResource(context.getResources(),
                        R.drawable.whygoprodialogimage);
                float imageWidthInPX = (float)image.getWidth();

                LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(Math.round(imageWidthInPX),
                        Math.round(imageWidthInPX * (float)icon.getHeight() / (float)icon.getWidth()));
                image.setLayoutParams(layoutParams);


            }
        });

和XML:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/goProDialogImage"
        android:layout_width="wrap_content"
        android:layout_height="350dp"
        android:src="@drawable/whygoprodialogimage"/>

</LinearLayout>

原始问题:

我的目标是让一个AlertDialog具有一个ImageView,它占用整个对话框,保留它的尺寸,再加上两个按钮.通过标准方法实现它,如下所示:

我试图消除它上面和下面的填充.这是设置方式的代码:

布局:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/goProDialogImage"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:src="@drawable/whygoprodialogimage"/>

</LinearLayout>

码:

AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setPositiveButton("Get Pro", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
            }
        }).setNegativeButton("No thanks", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
            }
        });
        AlertDialog dialog = builder.create();
        LayoutInflater inflater = getLayoutInflater();
        View dialogLayout = inflater.inflate(R.layout.go_pro_dialog_layout, null);
        dialog.setView(dialogLayout);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);

        dialog.show();

看完这个StackOverflow的答案后,我尝试实现该解决方案,因为他们的问题似乎相似,但即使它更接近我想要的结果,结果如下所示:

所以它消除了填充,但图像看起来很压扁.以下是此潜在修复实现的代码:

// Get screen size
        Display display = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        display.getSize(size);
        int screenWidth = size.x;
        int screenHeight = size.y;

        // Get target image size
        Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.whygoprodialogimage);
        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 resizedDialogImage = new BitmapDrawable(context.getResources(), Bitmap.createScaledBitmap(bitmap, bitmapWidth, bitmapHeight, false));

        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setPositiveButton("Get Pro", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {

            }
        }).setNegativeButton("No thanks", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
            }
        });
        AlertDialog dialog = builder.create();
        LayoutInflater inflater = getLayoutInflater();
        View dialogLayout = inflater.inflate(R.layout.go_pro_dialog_layout, null);
        dialog.setView(dialogLayout);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);

        // Without this line there is a very small border around the image (1px)
        dialog.getWindow().setBackgroundDrawable(null);

        dialog.show();
        ImageView image = (ImageView) dialog.findViewById(R.id.goProDialogImage);
        image.setBackground(resizedDialogImage);

是什么导致图像现在看起来被压扁？您可以告诉它摆脱了额外的填充但图像尺寸已更改.

Answer 1

我最终找到了解决这个问题的方法.因为手动更改ImageView的高度会删除额外的填充,所以我最终找到了原始图像的尺寸,并在计算出ImageView尺寸后将它们应用到ImageView.这是最终结果:

这是最终的工作代码:

AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setPositiveButton("Get Pro", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
            }
        }).setNegativeButton("No thanks", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
            }
        });
        final AlertDialog dialog = builder.create();
        LayoutInflater inflater = getLayoutInflater();
        View dialogLayout = inflater.inflate(R.layout.go_pro_dialog_layout, null);
        dialog.setView(dialogLayout);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);

        dialog.show();

        dialog.setOnShowListener(new DialogInterface.OnShowListener() {
            @Override
            public void onShow(DialogInterface d) {
                ImageView image = (ImageView) dialog.findViewById(R.id.goProDialogImage);
                Bitmap icon = BitmapFactory.decodeResource(context.getResources(),
                        R.drawable.whygoprodialogimage);
                float imageWidthInPX = (float)image.getWidth();

                LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(Math.round(imageWidthInPX),
                        Math.round(imageWidthInPX * (float)icon.getHeight() / (float)icon.getWidth()));
                image.setLayoutParams(layoutParams);


            }
        });

和XML:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

    <ImageView
        android:id="@+id/goProDialogImage"
        android:layout_width="wrap_content"
        android:layout_height="350dp"
        android:src="@drawable/whygoprodialogimage"/>

</LinearLayout>

Answer 2

这可能是晚了,但我认为,设置android:adjustViewBounds = "true"在ImageView能有所帮助.另外,我通常设置android:scaleType = "centerInside"或android:scaleType = "centerCrop"