android – 即使尺寸与屏幕匹配,WallpaperManager也会缩放图像

我有一个应用程序,将壁纸应用到主屏幕上,其图像与屏幕尺寸相匹配,但是在我应用它时,在壁纸s3上壁纸会被放大,即使使用的图像与屏幕尺寸完全匹配！它是静态图像,在主屏幕上切换页面时甚至不滚动.奇怪的是,如果我使用内置图库应用图像,壁纸应用得很好而没有缩放(它出现’裁剪图像’屏幕,但裁剪区域本身匹配图像的边缘)

我使用的代码在整个手机阵列上工作正常(星系注释,ace 2,s2等)但不在s3上;我想知道是否有什么可以强迫壁纸正确填满屏幕？我用来应用壁纸的当前代码是：

WallpaperManager wallpaperManager = WallpaperManager.getInstance(this);   
wallpaperManager.setWallpaperOffsets(wallpaperViewer.getapplicationwindowToken(),0);
wallpaperManager.setBitmap(BitmapFactory.decodeFile(file.getPath()));//file is jpg on sd card

解决方法

编辑：添加Y偏移修复 – 谢谢@Jason Goff！

好吧事实证明,s3上主屏幕的最小宽度不是720而是实际上是1280！你可以通过电话找到所需的最小壁纸宽度和高度

wallpaperManager.getDesiredMinimumWidth();//returned 1280 on s3
wallpaperManager.getDesiredMinimumHeight();//also returned 1280 on s3

因此,为了将壁纸应用到屏幕中心,我必须动态创建一个空白位图1280×1280,然后将我的壁纸覆盖到空白位图的中心,我创建了一个静态BitmapHelper类,其中包含调整位图的方法,这里是创建位图和覆盖壁纸图像的方法：

public class BitmapHelper {

public static Bitmap overlayIntoCentre(Bitmap bmp1,Bitmap bmp2) {
    Bitmap bmOverlay = Bitmap.createBitmap(bmp1.getWidth(),bmp1.getHeight(),bmp1.getConfig());
    Canvas canvas = new Canvas(bmOverlay);
    canvas.drawBitmap(bmp1,new Matrix(),null);//draw background bitmap

    //overlay the second in the centre of the first 
    //(may experience issues if the first bitmap is smaller than the second,but then why would you want to overlay a bigger one over a smaller one?!)
     //EDIT: added Y offest fix - thanks @Jason Goff!
     canvas.drawBitmap(bmp2,(bmp1.getWidth()/2)-(bmp2.getWidth()/2),(bmp1.getHeight()/2)-(bmp2.getHeight/2),null);

    return bmOverlay;
}

public static Bitmap createNewBitmap(int width,int height)
{
            //create a blanks bitmap of the desired width/height
    return Bitmap.createBitmap(width,height,Config.ARGB_8888);
}
}

并使用我的BitmapHelper继承我的其余代码：

private void applyWallpaperFromFile(final File file)
{
    Bitmap wallpaperImage = BitmapFactory.decodeFile(file.getPath());
    try {
        if((wallpaperManager.getDesiredMinimumWidth()>0)&&(wallpaperManager.getDesiredMinimumHeight()>0))
        {
            Bitmap blank = BitmapHelper.createNewBitmap(wallpaperManager.getDesiredMinimumWidth(),wallpaperManager.getDesiredMinimumHeight());
            Bitmap overlay = BitmapHelper.overlayIntoCentre(blank,wallpaperImage);

            wallpaperManager.setBitmap(overlay);

        }
        else
        {
            wallpaperManager.setBitmap(wallpaperImage);
        }
    } catch (IOException e) {
        // Todo Auto-generated catch block
        e.printstacktrace();
    }
    this.runOnUiThread(new Runnable() {

        @Override
        public void run() {
            Toast.makeText(WallpaperActivity.this,"Wallpaper set to:"+file.getName(),Toast.LENGTH_SHORT).show();

        }
    });

}