您可以嘗試調整您的位圖這樣的

DisplayMetrics displayMetrics = new DisplayMetrics();

getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);

int height = displayMetrics.heightPixels;

int width = displayMetrics.widthPixels << 1; // best wallpaper width is twice screen width

// First decode with inJustDecodeBounds=true to check dimensions

final BitmapFactory.Options options = new BitmapFactory.Options();

options.inJustDecodeBounds = true;

BitmapFactory.decodeFile(path, options);

// Calculate inSampleSize

options.inSampleSize = calculateInSampleSize(options, width, height);

// Decode bitmap with inSampleSize set

options.inJustDecodeBounds = false;

Bitmap decodedSampleBitmap = BitmapFactory.decodeFile(path, options);

WallpaperManager wm = WallpaperManager.getInstance(this);

try {

wm.setBitmap(decodedSampleBitmap);

} catch (IOException e) {

Log.e(TAG, "Cannot set image as wallpaper", e);

}

您calculateInSampleSize類可以是這樣的

public static int calculateInSampleSize(

BitmapFactory.Options options, int reqWidth, int reqHeight) {

// Raw height and width of image

final int height = options.outHeight;

final int width = options.outWidth;

int inSampleSize = 1;

if (height > reqHeight || width > reqWidth) {

// Calculate ratios of height and width to requested height and width

final int heightRatio = Math.round((float) height / (float) reqHeight);

final int widthRatio = Math.round((float) width / (float) reqWidth);

// Choose the smallest ratio as inSampleSize value, this will guarantee

// a final image with both dimensions larger than or equal to the

// requested height and width.

inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;

}

return inSampleSize;

}

請參閱此鏈接，進一步澄清

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