xutils按照图片的比例压缩接口

package com.example.myapplication;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.widget.ImageView;import org.xutils.common.Callback;import org.xutils.common.util.DensityUtil;import org.xutils.image.ImageOptions;import org.xutils.x;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;public class MainActivity extends AppCompatActivity {    private ImageView image;    private ImageOptions imageOptions2;    private ImageView image2;    private Bitmap bitmap;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        x.Ext.init(getApplication());        image =  (ImageView) findViewById(R.id.image);        image2 =  (ImageView) findViewById(R.id.image2);        if(imageOptions2==null){            imageOptions2 = new ImageOptions.Builder()//                    .setSize(DensityUtil.dip2px(120), DensityUtil.dip2px(120))//                    .setRadius(DensityUtil.dip2px(5))                    // 如果ImageView的大小不是定义为wrap_content, 不要crop.设置成fasle就好了//                    .setCrop(false) // 很多时候设置了合适的scaleType也不需要它.                    // 加载中或错误图片的ScaleType                    //.setPlaceholderScaleType(ImageView.ScaleType.MATRIX)//                    .setImageScaleType(ImageView.ScaleType.FIT_XY)                    .setLoadingDrawableId(R.mipmap.ic_launcher)//加载中的图片                    .setFailureDrawableId(R.mipmap.ic_launcher)//默认的图片                    .build();        }        x.image().loadDrawable( "http://img01.tooopen.com/Downs/images/2010/4/10/sy_20100410100959952919.jpg", imageOptions2, new Callback.CommonCallback<Drawable>() {            @Override            public void onSuccess(Drawable result) {                BitmapDrawable bd = (BitmapDrawable) result;                bitmap = bd.getBitmap();                Bitmap comp = comp(bitmap);                image.setImageBitmap(comp);            }            @Override            public void onError(Throwable ex, boolean isOnCallback) {                image.setImageResource(R.mipmap.ic_launcher);            }            @Override            public void onCancelled(CancelledException cex) {            }            @Override            public void onFinished() {            }        });        x.image().loadDrawable( "http://wenwen.soso.com/p/20120208/20120208225353-1466244753.jpg", imageOptions2, new Callback.CommonCallback<Drawable>() {            @Override            public void onSuccess(Drawable result) {                BitmapDrawable bd = (BitmapDrawable) result;                bitmap = bd.getBitmap();                Bitmap comp = comp(bitmap);                image2.setImageBitmap(comp);            }            @Override            public void onError(Throwable ex, boolean isOnCallback) {                image.setImageResource(R.mipmap.ic_launcher);            }            @Override            public void onCancelled(CancelledException cex) {            }            @Override            public void onFinished() {            }        });    }    private Bitmap comp(Bitmap image) {        ByteArrayOutputStream baos = new ByteArrayOutputStream();        image.compress(Bitmap.CompressFormat.JPEG, 100, baos);        if( baos.toByteArray().length / 1024>1024) {//判断如果图片大于1M,进行压缩避免在生成图片（BitmapFactory.decodeStream）时溢出            baos.reset();//重置baos即清空baos            image.compress(Bitmap.CompressFormat.JPEG, 50, baos);//这里压缩50%，把压缩后的数据存放到baos中        }        ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());        BitmapFactory.Options newOpts = new BitmapFactory.Options();        //开始读入图片，此时把options.inJustDecodeBounds 设回true了        newOpts.inJustDecodeBounds = true;        Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, newOpts);        newOpts.inJustDecodeBounds = false;        int w = newOpts.outWidth;        int h = newOpts.outHeight;        //现在主流手机比较多是800*480分辨率，所以高和宽我们设置为        float hh = 800f;//这里设置高度为800f        float ww = 480f;//这里设置宽度为480f        //缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可        int be = 1;//be=1表示不缩放        if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放            be = (int) (newOpts.outWidth / ww);        } else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放            be = (int) (newOpts.outHeight / hh);        }        if (be <= 0)            be = 1;        newOpts.inSampleSize = be;//设置缩放比例        newOpts.inPreferredConfig = Bitmap.Config.RGB_565;//降低图片从ARGB888到RGB565        //重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了        isBm = new ByteArrayInputStream(baos.toByteArray());        bitmap = BitmapFactory.decodeStream(isBm, null, newOpts);        return compressImage(bitmap);//压缩好比例大小后再进行质量压缩    }    private Bitmap compressImage(Bitmap image) {        ByteArrayOutputStream baos = new ByteArrayOutputStream();        image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中        int options = 100;        while ( baos.toByteArray().length / 1024>100) {    //循环判断如果压缩后图片是否大于100kb,大于继续压缩            baos.reset();//重置baos即清空baos            options -= 10;//每次都减少10            image.compress(Bitmap.CompressFormat.JPEG, options, baos);//这里压缩options%，把压缩后的数据存放到baos中        }        ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把压缩后的数据baos存放到ByteArrayInputStream中        Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片        return bitmap;    }}