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            Android图片压缩框架-Tiny


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            2017-04-23
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    <h2 id="目的"><a href="#目的"  title="目的"></a><strong>目的</strong></h2><p>为了简化对图片压缩的调用，提供最简洁与合理的api压缩逻辑，对于压缩为Bitmap根据屏幕分辨率动态适配最佳大小，对于压缩为File优化底层<code>libjpeg</code>的压缩，整个图片压缩过程全在压缩线程池中异步压缩，结束后分发回UI线程。</p>

支持的压缩类型

Tiny图片压缩框架支持的压缩数据源类型：

1、Bytes2、File3、Bitmap4、Stream5、Resource6、Uri（network、file、content）

Tiny支持单个数据源压缩以及批量压缩，支持的压缩类型：

1、数据源—>压缩为Bitmap2、数据源—>压缩为File3、数据源—>压缩为File并返回压缩后的Bitmap4、批量数据源—>批量压缩为Bitmap5、批量数据源—>批量压缩为File6、批量数据源—>批量压缩为File并返回压缩后Bitmap

压缩参数

Tiny.BitmapCompressOptions

Bitmap压缩参数可配置三个：

1、width2、height3、Bitmap.Config

如果不配置，Tiny内部会根据屏幕动态适配以及默认使用ARGB_8888

Tiny.FileCompressOptions

File压缩参数可配置四个：

1、quality-压缩质量，默认为762、isKeepSampling-是否保持原数据源图片的宽高3、fileSize-压缩后文件大小4、outfile-压缩后文件存储路径

如果不配置，Tiny内部会根据默认压缩质量进行压缩，压缩后文件默认存储在：ExternalStorage/Android/data/${packageName}/tiny/目录下

接入

见项目README

压缩为Bitmap

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Tiny.BitmapCompressOptions options = new Tiny.BitmapCompressOptions();
Tiny.getInstance().source("").asBitmap().withOptions(options).compress(new BitmapCallback() {
    @Override
    public void callback(boolean isSuccess, Bitmap bitmap) {
        //return the compressed bitmap object
    }
});

压缩为File

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Tiny.FileCompressOptions options = new Tiny.FileCompressOptions();
Tiny.getInstance().source("").asFile().withOptions(options).compress(new FileCallback() {
    @Override
    public void callback(boolean isSuccess, String outfile) {
        //return the compressed file path
    }
});

压缩为File并返回Bitmap

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Tiny.FileCompressOptions options = new Tiny.FileCompressOptions();
Tiny.getInstance().source("").asFile().withOptions(options).compress(new FileWithBitmapCallback() {
    @Override
    public void callback(boolean isSuccess, Bitmap bitmap, String outfile) {
        //return the compressed file path and bitmap object
    }
});

批量压缩为Bitmap

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Tiny.BitmapCompressOptions options = new Tiny.BitmapCompressOptions();
Tiny.getInstance().source("").batchAsBitmap().withOptions(options).batchCompress(new BitmapBatchCallback() {
    @Override
    public void callback(boolean isSuccess, Bitmap[] bitmaps) {
        //return the batch compressed bitmap object
    }
});

批量压缩为File

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Tiny.FileCompressOptions options = new Tiny.FileCompressOptions();
Tiny.getInstance().source("").batchAsFile().withOptions(options).batchCompress(new FileBatchCallback() {
    @Override
    public void callback(boolean isSuccess, String[] outfile) {
        //return the batch compressed file path
    }
});

批量压缩为File并返回Bitmap

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Tiny.FileCompressOptions options = new Tiny.FileCompressOptions();
Tiny.getInstance().source("").batchAsFile().withOptions(options).batchCompress(new FileWithBitmapBatchCallback() {
    @Override
    public void callback(boolean isSuccess, Bitmap[] bitmaps, String[] outfile) {
        //return the batch compressed file path and bitmap object
    }
});

Tiny与微信朋友圈的压缩率比较

下面是使用Tiny图片压缩库进行压缩的效果对比示例：

图片信息

Tiny

Wechat

6.66MB (3500x2156)

151KB (1280x788)

135KB (1280x789)

4.28MB (4160x3120)

219KB (1280x960)

195KB (1280x960)

2.60MB (4032x3024)

193KB (1280x960))

173KB (1280x960)

372KB (500x500)

38.67KB (500x500)

34.05KB (500x500)

236KB (960x1280)

127KB (960x1280)

118KB (960x1280)

Tiny项目地址

Tiny

也谈图片压缩 

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