android如何设置自适应大小的背景图片 Android – 设置壁纸以适应手机屏幕尺寸...

作者的回答在评论中,

但是没有人看到评论,我在这里复制：

Bitmap bmap2 = BitmapFactory.decodeStream(getResources().openRawResource(R.drawable.paper));

DisplayMetrics metrics = new DisplayMetrics();

getWindowManager().getDefaultDisplay().getMetrics(metrics);

int height = metrics.heightPixels;

int width = metrics.widthPixels;

Bitmap bitmap = Bitmap.createScaledBitmap(bmap2, width, height, true);

WallpaperManager wallpaperManager = WallpaperManager.getInstance(MainActivity.this);

try {

wallpaperManager.setBitmap(bitmap);

} catch (IOException e) {

e.printStackTrace();

}