背景图像的大小,以支持所有的中型和大型android屏幕

Icon Design guidelines 对于图标,以及 Range of Screens “区域 Supporting Multiple Screens

对于背景图像,请务必考虑状态栏的尺寸。

您可以将资源放在适当的drawable mdpi、drawable hdpi和drawable ldpi文件夹中,它们将得到适当的使用。

    mBackgroundGraphic = BitmapFactory.decodeResource(getResources(), R.drawable.background);
    mBackgroundGraphic = getResizedBitmap(mBackgroundGraphic);

public Bitmap getResizedBitmap(Bitmap bm) {
    int width = bm.getWidth();
    int height = bm.getHeight();
    int displayWidth = mDisplay.getWidth();
    int displayHeight = mDisplay.getHeight();
    float scaleWidth = ((float) displayWidth) / width;
    float scaleHeight = ((float) displayHeight) / height;

    // Create a matrix for the manipulation
    Matrix matrix = new Matrix();

    // Resize the bit map
    matrix.postScale(scaleWidth, scaleHeight);

    // Return the new stretched Bitmap
    return Bitmap.createBitmap(bm, 0, 0, width, height, matrix, false);
}