https://github.com/square/picasso

基本用法

 // 基本用法

        // 普通加载图片
        Picasso.with(PicassoActivity.this)
                .load("http://n.sinaimg.cn/translate/20160819/9BpA-fxvcsrn8627957.jpg")
                .into(ivPicassoResult1);

        // 裁剪的方式加载图片
        Picasso.with(PicassoActivity.this)
                .load("http://n.sinaimg.cn/translate/20160819/9BpA-fxvcsrn8627957.jpg")
                .resize(100,100)
                .into(ivPicassoResult2);

        // 选择180度
        Picasso.with(PicassoActivity.this)
                .load("http://n.sinaimg.cn/translate/20160819/9BpA-fxvcsrn8627957.jpg")
                .rotate(180)
                .into(ivPicassoResult3);
ListView中使用
public class PicassoListviewAdapter extends BaseAdapter {

    private Context mContext;

    public PicassoListviewAdapter(Context context) {
        mContext = context;
    }

    @Override
    public int getCount() {
        return Constants.IMAGES.length;
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if(convertView == null) {
            convertView = View.inflate(mContext, R.layout.item_picasso_listview,null);

            holder = new ViewHolder(convertView);

            convertView.setTag(holder);
        }else {
            holder = (ViewHolder) convertView.getTag();
        }

        // 名称
        holder.name.setText("item"+(position+1));

        // 加载图片
        Picasso.with(mContext)
                .load(Constants.IMAGES[position])
                .placeholder(R.drawable.atguigu_logo)
                .error(R.drawable.atguigu_logo)
                .into(holder.iv);

        return convertView;
    }

    class ViewHolder{
        @Bind(R.id.iv_picasso_item)
        ImageView iv;

        @Bind(R.id.tv_picasso_name)
        TextView name;

        public ViewHolder(View view) {
            ButterKnife.bind(this,view);
        }
    }
}

图片transform

compile 'com.squareup.picasso:picasso:2.5.2'

compile 'jp.wasabeef:picasso-transformations:2.1.0'
// If you want to use the GPU Filters
compile 'jp.co.cyberagent.android.gpuimage:gpuimage-library:1.4.1'

dip单位转像素px

public class Utils {
    public static int dip2px(Context context, float dp) {
        float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dp * scale + 0.5f);
    }
}
public class PicassoTransformationsAdapter extends BaseAdapter {
    private Context mContext;
    private List<String> mData;

    public PicassoTransformationsAdapter(Context context, List<String> data) {
        mContext = context;
        mData = data;
    }

    @Override
    public int getCount() {
        return mData == null ? 0 : mData.size();
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        ViewHolder holder;
        if(convertView == null) {
            convertView = View.inflate(mContext, R.layout.item_picasso_transformations,null);

            holder = new ViewHolder(convertView);

            convertView.setTag(holder);
        }else {
            holder = (ViewHolder) convertView.getTag();
        }

        // 显示名称
        holder.name.setText("item"+(position + 1));

        int integer = Integer.parseInt(mData.get(position));

        switch (integer) {

            case 1: {
                int width = Utils.dip2px(mContext, 133.33f);
                int height = Utils.dip2px(mContext, 126.33f);
                Picasso.with(mContext)
                        .load(R.drawable.check)
                        .resize(width, height)
                        .centerCrop()
                        .transform((new MaskTransformation(mContext, R.drawable.mask_starfish)))
                        .into(holder.image);
                break;
            }
            case 2: {
                int width = Utils.dip2px(mContext, 150.0f);
                int height = Utils.dip2px(mContext, 100.0f);
                Picasso.with(mContext)
                        .load(R.drawable.check)
                        .resize(width, height)
                        .centerCrop()
                        .transform(new MaskTransformation(mContext, R.drawable.chat_me_mask))
                        .into(holder.image);
                break;
            }
            case 3:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation(300, 100, CropTransformation.GravityHorizontal.LEFT,
                                CropTransformation.GravityVertical.TOP))
                        .into(holder.image);
                break;
            case 4:
                Picasso.with(mContext).load(R.drawable.demo)
                        // 300, 100, CropTransformation.GravityHorizontal.LEFT, CropTransformation.GravityVertical.CENTER))
                        .transform(new CropTransformation(300, 100)).into(holder.image);
                break;
            case 5:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation(300, 100, CropTransformation.GravityHorizontal.LEFT,
                                CropTransformation.GravityVertical.BOTTOM))
                        .into(holder.image);
                break;
            case 6:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation(300, 100, CropTransformation.GravityHorizontal.CENTER,
                                CropTransformation.GravityVertical.TOP))
                        .into(holder.image);
                break;
            case 7:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation(300, 100))
                        .into(holder.image);
                break;
            case 8:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation(300, 100, CropTransformation.GravityHorizontal.CENTER,
                                CropTransformation.GravityVertical.BOTTOM))
                        .into(holder.image);
                break;
            case 9:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation(300, 100, CropTransformation.GravityHorizontal.RIGHT,
                                CropTransformation.GravityVertical.TOP))
                        .into(holder.image);
                break;
            case 10:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation(300, 100, CropTransformation.GravityHorizontal.RIGHT,
                                CropTransformation.GravityVertical.CENTER))
                        .into(holder.image);
                break;
            case 11:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation(300, 100, CropTransformation.GravityHorizontal.RIGHT,
                                CropTransformation.GravityVertical.BOTTOM))
                        .into(holder.image);
                break;
            case 12:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation((float) 16 / (float) 9,
                                CropTransformation.GravityHorizontal.CENTER,
                                CropTransformation.GravityVertical.CENTER))
                        .into(holder.image);
                break;
            case 13:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation((float) 4 / (float) 3,
                                CropTransformation.GravityHorizontal.CENTER,
                                CropTransformation.GravityVertical.CENTER))
                        .into(holder.image);
                break;
            case 14:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation(3, CropTransformation.GravityHorizontal.CENTER,
                                CropTransformation.GravityVertical.CENTER))
                        .into(holder.image);
                break;
            case 15:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation(3, CropTransformation.GravityHorizontal.CENTER,
                                CropTransformation.GravityVertical.TOP))
                        .into(holder.image);
                break;
            case 16:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation(1, CropTransformation.GravityHorizontal.CENTER,
                                CropTransformation.GravityVertical.CENTER))
                        .into(holder.image);
                break;
            case 17:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation((float) 0.5, (float) 0.5,
                                CropTransformation.GravityHorizontal.CENTER,
                                CropTransformation.GravityVertical.CENTER))
                        .into(holder.image);
                break;
            case 18:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation((float) 0.5, (float) 0.5,
                                CropTransformation.GravityHorizontal.CENTER,
                                CropTransformation.GravityVertical.TOP))
                        .into(holder.image);
                break;
            case 19:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation((float) 0.5, (float) 0.5,
                                CropTransformation.GravityHorizontal.RIGHT,
                                CropTransformation.GravityVertical.BOTTOM))
                        .into(holder.image);
                break;
            case 20:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropTransformation((float) 0.5, 0, (float) 4 / (float) 3,
                                CropTransformation.GravityHorizontal.CENTER,
                                CropTransformation.GravityVertical.CENTER))
                        .into(holder.image);
                break;
            case 21:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropSquareTransformation())
                        .into(holder.image);
                break;
            case 22:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new CropCircleTransformation())
                        .into(holder.image);
                break;
            case 23:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new ColorFilterTransformation(Color.argb(80, 255, 0, 0)))
                        .into(holder.image);
                break;
            case 24:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new GrayscaleTransformation())
                        .into(holder.image);
                break;
            case 25:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new RoundedCornersTransformation(30, 0,
                                RoundedCornersTransformation.CornerType.BOTTOM_LEFT))
                        .into(holder.image);
                break;
            case 26:
                Picasso.with(mContext)
                        .load(R.drawable.check)
                        .transform(new BlurTransformation(mContext, 25, 1))
                        .into(holder.image);
                break;
            case 27:
                Picasso.with(mContext)
                        .load(R.drawable.demo)
                        .transform(new ToonFilterTransformation(mContext))
                        .into(holder.image);
                break;
            case 28:
                Picasso.with(mContext)
                        .load(R.drawable.check)
                        .transform(new SepiaFilterTransformation(mContext))
                        .into(holder.image);
                break;
            case 29:
                Picasso.with(mContext)
                        .load(R.drawable.check)
                        .transform(new ContrastFilterTransformation(mContext, 2.0f))
                        .into(holder.image);
                break;
            case 30:
                Picasso.with(mContext)
                        .load(R.drawable.check)
                        .transform(new InvertFilterTransformation(mContext))
                        .into(holder.image);
                break;
            case 31:
                Picasso.with(mContext)
                        .load(R.drawable.check)
                        .transform(new PixelationFilterTransformation(mContext, 20))
                        .into(holder.image);
                break;
            case 32:
                Picasso.with(mContext)
                        .load(R.drawable.check)
                        .transform(new SketchFilterTransformation(mContext))
                        .into(holder.image);
                break;
            case 33:
                Picasso.with(mContext)
                        .load(R.drawable.check)
                        .transform(new SwirlFilterTransformation(mContext, 0.5f, 1.0f, new PointF(0.5f, 0.5f)))
                        .into(holder.image);

                break;
            case 34:
                Picasso.with(mContext)
                        .load(R.drawable.check)
                        .transform(new BrightnessFilterTransformation(mContext, 0.5f))
                        .into(holder.image);
                break;
            case 35:
                Picasso.with(mContext)
                        .load(R.drawable.check)
                        .transform(new KuwaharaFilterTransformation(mContext, 25))
                        .into(holder.image);
                break;
            case 36:
                Picasso.with(mContext)
                        .load(R.drawable.check)
                        .transform(new VignetteFilterTransformation(mContext, new PointF(0.5f, 0.5f),
                                new float[]{0.0f, 0.0f, 0.0f}, 0f, 0.75f))
                        .into(holder.image);
                break;
        }

        return convertView;
    }

    class ViewHolder{

        @Bind(R.id.iv_picasso)
        ImageView image;

        @Bind(R.id.tv_picasso)
        TextView name;

        public ViewHolder(View view) {

            ButterKnife.bind(this, view);
        }
    }
}

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