工具类 dp转px 获取图片实际尺寸 获取屏幕尺寸

dp转px

public class Dp2pxUtils {
    public static int Dp2Px(Context context, float dp) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dp * scale + 0.5f);
    }
    /**
     * 根据手机的分辨率从 px(像素) 的单位 转成为 dp
     */
    public static int px2dip(Context context, float pxValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (pxValue / scale + 0.5f);
    }
}

 获取图片实际尺寸

public class ImgUtils {

    /**
     * 用bitmap获取图片的本来宽高
     */
    public static int getImgOriginalWidth(String path) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        //设置为true,表示解析Bitmap对象，该对象不占内存
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);

        int bitmapWidth = options.outWidth;

        return bitmapWidth;
    }
    /**
     * 用bitmap获取图片的本来宽高
     */
    public static int getImgOriginalHeight(String path) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        //设置为true,表示解析Bitmap对象，该对象不占内存
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);

        int bitmapHeight = options.outHeight;

        return bitmapHeight;
    }
    }

public class ImgUtils {

    /**
     * 用bitmap获取图片的本来宽高
     */
    public static int getImgOriginalWidth(String path) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        //设置为true,表示解析Bitmap对象，该对象不占内存
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);

        int bitmapWidth = options.outWidth;

        return bitmapWidth;
    }
    /**
     * 用bitmap获取图片的本来宽高
     */
    public static int getImgOriginalHeight(String path) {
        BitmapFactory.Options options = new BitmapFactory.Options();
        //设置为true,表示解析Bitmap对象，该对象不占内存
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeFile(path, options);

        int bitmapHeight = options.outHeight;

        return bitmapHeight;
    }
    }

获取屏幕尺寸

public class ScreenUtil {

    public static int getScreenHight(Context context) {
        DisplayMetrics displaymetrics = new DisplayMetrics();
        ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getMetrics(displaymetrics);
        return displaymetrics.heightPixels;
    }

    public static int getScreenWidth(Context context) {
        DisplayMetrics displaymetrics = new DisplayMetrics();
        ((WindowManager) context.getSystemService(Context.WINDOW_SERVICE)).getDefaultDisplay().getMetrics(displaymetrics);
        return displaymetrics.widthPixels;
    }
}