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( "h
a834
ttp://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;
}

}