【Android筆記】一些常用的代碼

    /**
     * 根據歌曲id獲取圖片
     * @param albumId
     * @return
     */
    private String getAlbumImage(int albumId) {
        String result = "";

        Cursor cursor = null;
        try {

            cursor = mContext.getContentResolver().query(
                    Uri.parse("content://media/external/audio/albums/"+albumId),new String[]{"album_art"},null,
                    null, null);
            while (cursor.moveToNext()) {
                result = cursor.getString(0);

            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (cursor!=null) {
                cursor.close();
            }
        }
        return result;
    }

/**
* DesCrip:Glide圓角圖片 
 * Created by Paul on 2017/5/15.
 */

public class GlideCircleTransform extends BitmapTransformation {
    public GlideCircleTransform(Context context) {
        super(context);
    }

    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        return circleCrop(pool, toTransform);
    }

    private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {
        if (source == null) return null;
        int size = Math.min(source.getWidth(), source.getHeight());
        int x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;
        // TODO this could be acquired from the pool too
        Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);
        Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
        }
        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        float r = size / 2f;
        canvas.drawCircle(r, r, r, paint);
        return result;
    }

    @Override
    public String getId() {
        return getClass().getName();
    }
}