ImageCompress

最新推荐文章于 2025-01-09 19:00:41 发布

SuperMonsterH

最新推荐文章于 2025-01-09 19:00:41 发布

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本文链接：https://blog.youkuaiyun.com/github_39118247/article/details/75150841

package com.hgz.test.imagecompress;

import android.graphics.Bitmap;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;

import com.hgz.test.imagecompress.utils.ImageCompressTools;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends AppCompatActivity {

    private ImageView imageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btnShowImage = (Button) findViewById(R.id.btnShowImage);
        imageView = (ImageView) findViewById(R.id.showImage);
        btnShowImage.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                getImage();
            }
        });
    }
    private void getImage(){
        new AsyncTask<String, Void, Bitmap>() {
            @Override
            protected void onPostExecute(Bitmap bitmap) {
                super.onPostExecute(bitmap);
                if(bitmap != null)
                    imageView.setImageBitmap(bitmap);
                else
                    imageView.setImageResource(R.mipmap.ic_launcher);
            }

            @Override
            protected Bitmap doInBackground(String... params) {
                try {
                    String path = params[0];
                    URL url = new URL(path);
                    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
                    connection.setRequestMethod("GET");
                    connection.setConnectTimeout(5000);
                    connection.setReadTimeout(5000);


                    int code = connection.getResponseCode();

                    if (code == 200) {
                        //得到图片数据
                        InputStream is = connection.getInputStream();

                        return ImageCompressTools.decodeStreamFromNetWork(url, is, 50, 50);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return null;
            }
        }.execute("http://i1.s1.dpfile.com/pc/f59ce7b879eea202f36692aa9ead9dac(249x249)/thumb.jpg");
    }
}

Utils类

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import java.io.InputStream;
import java.net.URL;

public class ImageCompressTools {
    /**
     *  计算图片的采样率
     * @param options
     * @param reqWidth  你所期望压缩的宽度
     * @param reqHeight  你所期望压缩的高度
     */
    public static int caculateSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight){

        //得到这个图片的原始宽高
        int width = options.outWidth;
        int height = options.outHeight;

        System.out.println("宽:"+width+"高 : "+height);

        int inSampleSize = 1;

        if(width > reqWidth || height > reqHeight){

            int halfWidth = width / 2;
            int halfHeight = height / 2;

            while ((halfWidth / inSampleSize) >= reqWidth && (halfHeight / inSampleSize) >= reqHeight){

                inSampleSize *= 2;

            }

        }
        return inSampleSize;
    }


    /**
     * 图片压缩彻底封装
     * @param url
     * @param is
     * @param reqWidth
     * @param reqHeight
     * @return
     * @throws Exception
     */
    public static Bitmap decodeStreamFromNetWork(URL url, InputStream is, int reqWidth, int reqHeight) throws Exception{

        BitmapFactory.Options options = new BitmapFactory.Options();
        //假解析
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(is,null,options);

        //计算采样率
        options.inSampleSize = caculateSampleSize(options,reqWidth,reqHeight);
        //开始真正解析图片
        options.inJustDecodeBounds = false;
        //关闭流,避免decodeStream(1,2,3);bug
        is.close();
        InputStream inputStream = url.openStream();
        return BitmapFactory.decodeStream(inputStream,null,options);
    }

}