Picasso 学习(含高斯模糊，圆头像，正方头像)

。。。

1.引用https://repo1.maven.org/maven2/com/squareup/picasso/picasso/2.5.2/picasso-2.5.2.jar

2.proguard处理

-keep class com.squareup.** { *;}

3.代码处理

。。。

package com.example.android;

import java.util.ArrayList;
import java.util.List;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.ColorMatrix;
import android.graphics.ColorMatrixColorFilter;
import android.graphics.Paint;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.renderscript.Allocation;
import android.renderscript.Element;
import android.renderscript.RenderScript;
import android.renderscript.ScriptIntrinsicBlur;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.android.AutoListView.OnLoadListener;
import com.example.android.AutoListView.OnRefreshListener;
import com.squareup.picasso.Picasso;
import com.squareup.picasso.Transformation;

/**
 * 
 * 
 * @author jsonv_000
 *
 */
public class ListMainActivity extends Activity {
	static String TAG = "ListMainActivity";
	List<Info> list = new ArrayList<Info>();
	List<Info> resultList = new ArrayList<Info>();
	ListMainActivity context = ListMainActivity.this;
	String tmp = "" + System.currentTimeMillis();
	AutoListView listView;
	Handler handler;
	int page = 1;
	ItemAdapter itemAdapter;

	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.list);

		listView = (AutoListView) findViewById(R.id.list);
		itemAdapter = new ItemAdapter();
		listView.setAdapter(itemAdapter);
		listView.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				// 点击列表项转入ViewPager显示界面
				// startImagePagerActivity(position);
				try {
					position=position-1;
					startActivity(new Intent(context, WebViewActivity.class)
							.putExtra("aid", list.get(position).getId()));	
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
		initListView();
		listView.setOnRefreshListener(new OnRefreshListener() {

			@Override
			public void onRefresh() {
				refresh();
			}
		});
		listView.setOnLoadListener(new OnLoadListener() {

			public void onLoad() {
				page = 1 + page;
				sendData();
			}
		});
		refresh();
	}

	public void refresh() {
		list.clear();
		page = 1;
		sendData();
	}

	public void initListView() {
		if (handler == null) {
			handler = new Handler() {
				@Override
				public void handleMessage(Message msg) {
					super.handleMessage(msg);
					if (page == 1) {
						// 刷新
						listView.onRefreshComplete();
						list.clear();
						list.addAll(resultList);
					} else {
						// 更多
						listView.onLoadComplete();
						list.addAll(resultList);
					}
					listView.setResultSize(resultList.size());
					itemAdapter.notifyDataSetChanged();
				}
			};

		}
	}
	


	public void sendData() {
		resultList.clear();
		new Thread(new Runnable() {

			@Override
			public void run() {
				// TODO Auto-generated method stub
				try {
					resultList = Http.sendData(page);
				} catch (Exception e) {
					e.printStackTrace();
				} finally {
					handler.sendEmptyMessage(0);
				}
			}
		}).start();
	}

	@Override
	public void onBackPressed() {
		super.onBackPressed();
	}

	/**
	 * 
	 * 自定义列表项适配器
	 *
	 */
	class ItemAdapter extends BaseAdapter {

		private class ViewHolder {
			public TextView text;
			public ImageView image;
		}

		@Override
		public int getCount() {
			return list.size();
		}

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

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

		@Override
		public View getView(final int position, View convertView,
				ViewGroup parent) {
			View view = convertView;
			final ViewHolder holder;

			if (convertView == null) {
				view = getLayoutInflater().inflate(R.layout.item_list, parent,
						false);
				holder = new ViewHolder();
				holder.text = (TextView) view.findViewById(R.id.text);
				holder.image = (ImageView) view.findViewById(R.id.image);
				view.setTag(holder); // 给View添加一个格外的数据
			} else {
				holder = (ViewHolder) view.getTag(); // 把数据取出来
			}
			try {
				
				Info info = list.get(position);
				holder.text.setText(info.getTitle()); // TextView设置文本
				Log.i("image", ""+info.getImg());
//				Picasso.with(context).load(info.getImg()).into(	holder.image);
				Picasso.with(context)
			    .load(info.getImg())
			   // .transform(new CircleTransform())//  圆图
			   // .transform(new YellowTransformation())
			      .transform(new BlurTransformation(context)) //模糊
			      .fit()//自动计算长宽合适  
//			      .rotate(45f, 200f, 100f)//旋转
			    .placeholder(R.drawable.icon_bg)
			    .error(R.drawable.icon_bg)
			    .into(holder.image);
			} catch (Exception e) {
				e.printStackTrace();
			}

			return view;
		}
	}

/**
 * picasso加载圆形图片
 * Created by ge on 2015/8/8.
 */
public class CircleTransform implements Transformation {
    @Override
    public Bitmap transform(Bitmap source) {
        int size = Math.min(source.getWidth(), source.getHeight());

        int x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;

        Bitmap squaredBitmap = Bitmap.createBitmap(source, x, y, size, size);
        if (squaredBitmap != source) {
            source.recycle();
        }

        Bitmap bitmap = Bitmap.createBitmap(size, size, source.getConfig());

        Canvas canvas = new Canvas(bitmap);
        Paint paint = new Paint();
        BitmapShader shader = new BitmapShader(squaredBitmap,
                BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP);
        paint.setShader(shader);
        paint.setAntiAlias(true);

        float r = size / 2f;
        canvas.drawCircle(r, r, r, paint);

        squaredBitmap.recycle();
        return bitmap;
    }

    @Override
    public String key() {
        return "circle";
    }
}     
/**
 * picasso加载正方形图片，长宽比较取最小边
 * Created by ge on 2015/7/18.
 */
public class CropSquareTransformation implements Transformation {

    //截取从宽度和高度最小作为bitmap的宽度和高度
    @Override
    public Bitmap transform(Bitmap source) {
        int x;
        int size = Math.min(source.getWidth(), source.getHeight());

        if (source.getWidth() >= source.getHeight()){
            x = (source.getHeight() - size) / 2;
        }else {
            x = (source.getWidth() - size) / 2;
        }
        Bitmap result = Bitmap.createBitmap(source, x, x, size, size);
        if (result != source) {
            source.recycle();
        }

        return result;
    }

    @Override
    public String key() {
        return "crop()";
    }
}
/**
 * 照片泛黄
 * Created by ge on 15/8/20.
 */
public class YellowTransformation implements Transformation {
    @Override
    public Bitmap transform(Bitmap source) {
        Bitmap output = Bitmap.createBitmap(source.getWidth(),
                source.getHeight(), Bitmap.Config.RGB_565);
        Canvas canvas = new Canvas(output);
        Paint paint = new Paint();
        ColorMatrix cm = new ColorMatrix();
        float[] array = { 1, 0, 0, 0, 100, 0, 1, 0, 0, 100, 0, 0, 1, 0, 0, 0,
                0, 0, 1, 0 };
        cm.set(array);
        paint.setColorFilter(new ColorMatrixColorFilter(cm));
        canvas.drawBitmap(source, 0, 0, paint);
        source.recycle();
        return output;
    }

    @Override
    public String key() {
        return "yellow()";
    }
}
/**
 * 模糊
 * @author jia
 *
 */
public class BlurTransformation implements Transformation {

    RenderScript rs;

    public BlurTransformation(Context context) {
        super();
        rs = RenderScript.create(context);
    }

    @SuppressLint("NewApi")
	@Override
    public Bitmap transform(Bitmap bitmap) {
        // 创建一个Bitmap作为最后处理的效果Bitmap
        Bitmap blurredBitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);

        // 分配内存
        Allocation input = Allocation.createFromBitmap(rs, blurredBitmap, Allocation.MipmapControl.MIPMAP_FULL, Allocation.USAGE_SHARED);
        Allocation output = Allocation.createTyped(rs, input.getType());

        // 根据我们想使用的配置加载一个实例
        ScriptIntrinsicBlur script = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));
        script.setInput(input);

        // 设置模糊半径
        script.setRadius(10);

        //开始操作
        script.forEach(output);

        // 将结果copy到blurredBitmap中
        output.copyTo(blurredBitmap);

        //释放资源
        bitmap.recycle();

        return blurredBitmap;
    }

    @Override
    public String key() {
        return "blur";
    }
}

}