Android WallpaperManager crops image

最新推荐文章于 2025-04-26 22:14:54 发布

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本文介绍了一种确保壁纸图片能够正确填充整个屏幕的方法。通过自动为壁纸图片添加填充，使其大小与屏幕分辨率相匹配，避免了图片显示不全的问题。

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I had the same problem. I made an image that is the size of the screen and adding padding to the image so that it is as large as the WallpaperManager getDesiredMinimumWidth() and getDesiredMinimumHeight().

It seemed better to have some code automatically add the padding so that is what I used below. Make sure the image is the same size as the screen.

private void setWallpaper() {
    try {
        WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);
        //import non-scaled bitmap wallpaper
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inScaled = false;
        Bitmap wallpaper = BitmapFactory.decodeResource(getResources(), R.drawable.wallpaper, options);

        if (wallpaperManager.getDesiredMinimumWidth() > wallpaper.getWidth() &&
                wallpaperManager.getDesiredMinimumHeight() > wallpaper.getHeight()) {
            //add padding to wallpaper so background image scales correctly
            int xPadding = Math.max(0, wallpaperManager.getDesiredMinimumWidth() - wallpaper.getWidth()) / 2;
            int yPadding = Math.max(0, wallpaperManager.getDesiredMinimumHeight() - wallpaper.getHeight()) / 2;
            Bitmap paddedWallpaper = Bitmap.createBitmap(wallpaperManager.getDesiredMinimumWidth(), wallpaperManager.getDesiredMinimumHeight(), Bitmap.Config.ARGB_8888);
            int[] pixels = new int[wallpaper.getWidth() * wallpaper.getHeight()];
            wallpaper.getPixels(pixels, 0, wallpaper.getWidth(), 0, 0, wallpaper.getWidth(), wallpaper.getHeight());
            paddedWallpaper.setPixels(pixels, 0, wallpaper.getWidth(), xPadding, yPadding, wallpaper.getWidth(), wallpaper.getHeight());

            wallpaperManager.setBitmap(paddedWallpaper);
        } else {
            wallpaperManager.setBitmap(wallpaper);
        }
    } catch (IOException e) {
        Log.e(TAG,"failed to set wallpaper");
    }
}