您这个是图片上传的时候，本地图片压缩吗？ 我之前也研究过微信朋友圈的图片压缩，当时得到的结果是： 第一步进行采样率压缩； 第二步进行宽高的等比例压缩（微信对原图和缩略图限制了最大长宽或者最小长宽）； 第三步就是对图片的质量进行压缩（一般75或者70）； 第四部就是采用webP的格式。 经过这四部的处理，基本上和微信朋友圈的效果一致，包括文件大小和显示效果。 （PS：最近看到微信朋友圈好像换了图片格式，这还有待考证）

for (int i = 0; i < activity.selectedImgList.size(); i++) {
        final ImageItem img = activity.selectedImgList.get(i);

        if (img.size / 1024 < 500) {
            /*不压缩  直接添加*/
            compressedImgList.add(new File(img.path));
            checkComplete();
        } else {
            /*压缩后再添加*/
            compressImg(new File(img.path), i);
        }

    }

上面是添加压缩任务

然后开始压缩，结果 compressedImgList.add(file);的时候添加的是重复的图片 private void compressImg(final File imgFile, int position) { L.i("压缩图片"); Luban.get(activity) .load(imgFile) .putGear(Luban.THIRD_GEAR) .setFilename(imgFile.getName()) .setCompressListener(new OnCompressListener() { @Override public void onStart() {

                    Log.i("开始压缩,原图大小：", imgFile.length() / 1024 + "k");
                }

                @Override
                public void onSuccess(File file) {
                    Log.i("压缩完成，压缩后大小：", file.length() / 1024 + "k");
                    compressedImgList.add(file);
                    L.i("添加的文件名是：" + file.getName());

                    checkComplete();

                }

                @Override
                public void onError(Throwable e) {
                    /*压缩失败  添加原图*/
                    L.i("压缩失败  添加原图");
                    compressedImgList.add(imgFile);
                    checkComplete();
                }
            }).launch();
}

下面是打印日志

I/压缩完成，压缩后大小：: 191k 10-27 15:02:26.023 28680-28680/com.ship.yzq.ship I/shipApp: 添加的文件名是：IMG_20161027_142337.jpg.jpg 10-27 15:02:26.605 28680-28680/com.ship.yzq.ship I/压缩完成，压缩后大小：: 178k 10-27 15:02:26.606 28680-28680/com.ship.yzq.ship I/shipApp: 添加的文件名是：IMG_20161027_142331.jpg.jpg 10-27 15:02:26.682 28680-28680/com.ship.yzq.ship I/压缩完成，压缩后大小：: 184k 10-27 15:02:26.682 28680-28680/com.ship.yzq.ship I/shipApp: 添加的文件名是：IMG_20161027_142331.jpg.jpg 10-27 15:02:26.781 28680-28680/com.ship.yzq.ship I/压缩完成，压缩后大小：: 189k 10-27 15:02:26.781 28680-28680/com.ship.yzq.ship I/shipApp: 添加的文件名是：IMG_20161027_142327.jpg.jpg 10-27 15:02:26.807 28680-28680/com.ship.yzq.ship I/shipApp: IMG_20161027_142337.jpg.jpg 10-27 15:02:26.807 28680-28680/com.ship.yzq.ship I/shipApp: IMG_20161027_142331.jpg.jpg 10-27 15:02:26.807 28680-28680/com.ship.yzq.ship I/shipApp: IMG_20161027_142331.jpg.jpg 10-27 15:02:26.807 28680-28680/com.ship.yzq.ship I/shipApp: IMG_20161027_142327.jpg.jpg

Luban.get(getContext()) .load(new File(item.path)) //传人要压缩的图片 .putGear(Luban.THIRD_GEAR) //设定压缩档次，默认三挡 .setFilename(SDCardUtils.SdPath(getContext(), "qa") + System.currentTimeMillis() + "." + FileUtils.getFilenameExtension(item.path))

为了在压缩后有时是没有后缀,所以设置文件路径名称,使其压缩后按该文件路径跟名称保存. 但是,目前情况是得到的文件结果不可预料...有时候是按设置的路径名称,有时候是原路径,设置的没有起作用.对于该方法到底是起到一个什么作用疑惑.我就是想压缩后按我给的路径生成文件,希望能给出具体的解决方案.

1、我最近在找工作，Luban 也是这两天突然爆发起来，如果有问题请各位包涵 2、图片压缩是安卓开发的刚需，我希望能靠大家一起讨论完善 Luban 3、如果想把 Luban 用上线上产品的大大请直接用源码，并针对自家产品优化，不要因为 Luban 而对产品造成影响 4、我会不断花时间优化 Luban 项目，希望大家多多支持 5、想加入讨论的大家是希望建Q群，微信群，还是继续在 issues 中讨论，可以在本 issues 下发表意见

213, 214 行 width 和 height 转变成了 最短边 和 最长边

        width = thumbW > thumbH ? thumbH : thumbW;
        height = thumbW > thumbH ? thumbW : thumbH;

可是后面有用它来当做宽高来计算 (取名字 多么重要)

   thumbW = width / 2;
   thumbH = height / 2;

   thumbW = width / 4;
    thumbH = height / 4;

是不是想写 ?

thumbW/=2;

rt,我是这么循环压缩的

for(String fileUrl : fileList){
            Luban.get(this).putGear(Luban.THIRD_GEAR)
            .load(new File(fileUrl))
//            .setFilename(getCurrentPhotoFile().getAbsolutePath())
            .setCompressListener(new OnCompressListener() {

                @Override
                public void onSuccess(File file) {
                    DLog.i("完成剪裁:" + file.getAbsolutePath());
                    mCompressList.add(file.getAbsolutePath());
                    if(mCompressList.size() == fileList.size()){
                        uploadFile(mCompressList);
                    }
                }

                @Override
                public void onStart() {
                    DLog.i("开始剪裁");
                }

                @Override
                public void onError(Throwable e) {
                    DLog.i("error:" + e.toString());
                }
            }).launch();

结果发现剪裁完的地址可能会出现相同的结果。

public void dealImg(ArrayList fileList){ files.clear(); for (int i = 0; i < fileList.size(); i++) { File file = fileList.get(i); Luban.get(this) .load(file) //传人要压缩的图片 .putGear(Luban.THIRD_GEAR) //设定压缩档次，默认三挡 .setCompressListener(new OnCompressListener() { @Override public void onStart() {

                    }

                    @Override
                    public void onSuccess(File file) {
                        files.add(file);
                    }

                    public void onError(Throwable e) {

                    }
                }).launch();    //启动压缩
    }
}

java.lang.NoClassDefFoundError: Failed resolution of: Lrx/Observable; at top.zibin.luban.Luban.launch(Luban.java:113) at com.xinji.jugongyouyue.workeractivity.WorkerActivityAddProject.dealImg(WorkerActivityAddProject.java:304) at com.xinji.jugongyouyue.workeractivity.WorkerActivityAddProject.onActivityResult(WorkerActivityAddProject.java:296) at android.app.Activity.dispatchActivityResult(Activity.java:6378) at android.app.ActivityThread.deliverResults(ActivityThread.java:3970) at android.app.ActivityThread.handleSendResult(ActivityThread.java:4017) at android.app.ActivityThread.access$1300(ActivityThread.java:178) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1602) at android.os.Handler.dispatchMessage(Handler.java:111) at android.os.Looper.loop(Looper.java:192) at android.app.ActivityThread.main(ActivityThread.java:5784) at java.lang.reflect.Method.invoke(Native Method) at java.lang.reflect.Method.invoke(Method.java:372) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1084) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850) Caused by: java.lang.ClassNotFoundException: Didn't find class "rx.Observable" on path: DexPathList[[zip file "/data/app/com.xinji.jugongyouyue-1/base.apk"],nativeLibraryDirectories=[/data/app/com.xinji.jugongyouyue-1/lib/arm, /vendor/lib, /system/lib]] at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56) at java.lang.ClassLoader.loadClass(ClassLoader.java:511) at java.lang.ClassLoader.loadClass(ClassLoader.java:469) at top.zibin.luban.Luban.launch(Luban.java:113)  at com.xinji.jugongyouyue.workeractivity.WorkerActivityAddProject.dealImg(WorkerActivityAddProject.java:304)  at com.xinji.jugongyouyue.workeractivity.WorkerActivityAddProject.onActivityResult(WorkerActivityAddProject.java:296)  at android.app.Activity.dispatchActivityResult(Activity.java:6378)  at android.app.ActivityThread.deliverResults(ActivityThread.java:3970)  at android.app.ActivityThread.handleSendResult(ActivityThread.java:4017)  at android.app.ActivityThread.access$1300(ActivityThread.java:178)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1602)  at android.os.Handler.dispatchMessage(Handler.java:111)  at android.os.Looper.loop(Looper.java:192)  at android.app.ActivityThread.main(ActivityThread.java:5784)  at java.lang.reflect.Method.invoke(Native Method)  at java.lang.reflect.Method.invoke(Method.java:372)  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1084)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)  Suppressed: java.lang.ClassNotFoundException: rx.Observable at java.lang.Class.classForName(Native Method) at java.lang.BootClassLoader.findClass(ClassLoader.java:781) at java.lang.BootClassLoader.loadClass(ClassLoader.java:841) at java.lang.ClassLoader.loadClass(ClassLoader.java:504) ... 16 more

日志如下：

Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference

top.zibin.luban.Engine.compress(Engine.java:79)

e.e.d.b.an.a(UnsafeAccess.java:109) 3 ...... 4 Caused by: 5 java.lang.NoSuchFieldException:producerIndex 6 java.lang.Class.getDeclaredField(Class.java:596) 7 e.e.d.b.an.a(UnsafeAccess.java:106) 8 e.e.d.b.n.(MpmcArrayQueue.java:31) 9 e.e.d.j.a(ObjectPool.java:153) 10 e.e.d.j.(ObjectPool.java:57) 11 e.e.d.j.(ObjectPool.java:36) 12 e.e.d.o$1.(RxRingBuffer.java:280) 13 e.e.d.o.(RxRingBuffer.java:280) 14 e.d.a(Observable.java:6394) 15 top.zibin.luban.b.a(Luban.java:135)

是什么问题啊？

华为mate30Pro，鸿蒙系统 v3.10.6 已经设置targetSdk = 29和android:requestLegacyExternalStorage="true"

public class ImageCompressEngine implements CompressFileEngine {

    @Override
    public void onStartCompress(Context context, ArrayList<Uri> source, OnKeyValueResultCallbackListener call) {
        Luban.with(context).load(source).ignoreBy(500)
                .filter(path -> PictureMimeType.isUrlHasImage(path) && !PictureMimeType.isHasHttp(path))
                .setCompressListener(new OnNewCompressListener() {
                    @Override
                    public void onStart() {

                    }

                    @Override
                    public void onSuccess(String source, File compressFile) {
                        LogUtils.i("localMediaCompress",source);
                        if (call != null) {
                            call.onCallback(source, compressFile.getAbsolutePath());
                        }
                    }

                    @Override
                    public void onError(String source, Throwable e) {
                        LogUtils.i("localMediaCompress", source);
                        LogUtils.i("localMediaCompress", e.getMessage());
                        if (call != null) {
                            call.onCallback(source, null);
                        }
                    }
                }).launch();
    }
}

稍微大点的图片，2-3M的，手机拍照的，就会loading很长时间，一张差不多2分钟左右吧，且大几率会crash

执行代码：Luban.with(context).load(fileList).get(); 运行设备： 荣耀magic ui 安卓11设备上报错， 小米安卓12上代码正常执行 报错信息： Attempt to invoke virtual method 'boolean android.graphics.Bitmap.compress(android.graphics.Bitmap$CompressFormat, int, java.io.OutputStream)' on a null object reference

android Q上若传文件Uri，使用Uri类型的InputStreamProvider

new InputStreamProvider() {
@Override
                public InputStream open() throws IOException {
                    return context.getContentResolver().openInputStream(uri);
                }

                @Override
                public String getPath() {
                    return uri.getPath();
                }

                @Override
                public boolean isUri() {
                    return true;
                }

                @Override
                public long getLength() {
                    try {
                        switch (uri.getScheme()) {
                            case ContentResolver.SCHEME_FILE:
                                return new File(uri.getPath()).length();
                            case ContentResolver.SCHEME_CONTENT:
                                Cursor cursor = context.getContentResolver().query(uri, null, null, null, null);
                                long tempLength = 0;
                                if (cursor != null && cursor.moveToFirst()) {
                                    tempLength = new File(cursor.getString(cursor.getColumnIndex("_data"))).length();
                                    cursor.close();
                                }
                                return tempLength;
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                    return 0;
                }
            }

在原Luban compress方法中

private File compress(Context context, InputStreamProvider path) throws IOException {
        File result;

        File outFile = getImageCacheFile(context, Checker.SINGLE.extSuffix(path));

        if (mRenameListener != null) {
            String filename = mRenameListener.rename(path.getPath());
            outFile = getImageCustomFile(context, filename);
        }

        if (mCompressionPredicate != null) {
            if (mCompressionPredicate.apply(path.getPath())
                    && Checker.SINGLE.needCompress(mLeastCompressSize, path)) {
                result = new Engine(path, outFile, focusAlpha).compress();
            } else {
                result = new File(path.getPath());
            }
        } else {
            result = Checker.SINGLE.needCompress(mLeastCompressSize, path) ?
                    new Engine(path, outFile, focusAlpha).compress() :
                    new File(path.getPath());
        }

        return result;
    }

若Checker.SINGLE.needCompress()返回false，直接返回uri.getPath() = eg：/external/images/media/1947 这个路径是公共目录，不能直接通过uri访问 但通过根据InputStreamProvider的open方法返回的InputStream，可以获取到源文件数据，copy到私有目录即可

private File compress(Context context, InputStreamProvider path) throws IOException {
        File result;

        File outFile = getImageCacheFile(context, Checker.SINGLE.extSuffix(path));

        if (mRenameListener != null) {
            String filename = mRenameListener.rename(path.getPath());
            outFile = getImageCustomFile(context, filename);
        }

        if (mCompressionPredicate != null) {
            if (mCompressionPredicate.apply(path.getPath())
                    && Checker.SINGLE.needCompress(mLeastCompressSize, path)) {
                result = new Engine(path, outFile, focusAlpha).compress();
            } else {
                // android Q后拷贝文件到私有目录
                result = path.isUri() ? new Mold(path, outFile).copy() : new File(path.getPath());
            }
        } else {
            result = Checker.SINGLE.needCompress(mLeastCompressSize, path) ?
                    new Engine(path, outFile, focusAlpha).compress() :
                    // android Q后拷贝文件到私有目录
                    (path.isUri() ? new Mold(path, outFile).copy() : new File(path.getPath()));
        }

        return result;
    }

/**

• copy file */

class Mold {
    private InputStreamProvider srcImg;
    private File tagImg;

    Mold(InputStreamProvider srcImg, File tagImg) {
        this.tagImg = tagImg;
        this.srcImg = srcImg;
    }

    File copy() throws IOException {
        InputStream inputStream = srcImg.open();
        FileOutputStream fos = new FileOutputStream(tagImg);
        byte[] b = new byte[1024];
        while ((inputStream.read(b)) != -1) {
            fos.write(b);// 写入数据
        }
        inputStream.close();
        fos.flush();
        fos.close();
        return tagImg;
    }
}

Parallel test execution maxParallelForks. Gradle can run multiple test cases in parallel by setting maxParallelForks.

Disable report generation. We can conditionally disable it by setting reports.html.required = false; reports.junitXml.required = false. If you need to generate reports, add -PcreateReports to the end of Gradle's build command line.

===================== If there are any inappropriate modifications in this PR, please give me a reply and I will change them.