android 给图片加文字、图片水印

Stamper is a tool for stamping a pattern into a picture,it likes a watermark.

Stamper是一个给图片打水印的工具，支持图片水印和文字水印，水印位置可以任意调节。

效果图：

实现原理：

Stamper将原图当作画布，把水印图或者文字画入原图中。生成bitmap。

Stamper使用方法：

1.添加依赖

Step 1. Add the JitPack repository to your build file; Add it in your root build.gradle at the end of repositories:

allprojects {        repositories {        ...        maven { url 'https://jitpack.io' }        }        }

Step 2. Add the dependency

dependencies {         implementation 'com.github.KernHu:Stamper:1.1'}

2.代码部分：

1.use it stamp a text;

Bitmap bitmap3 = BitmapFactory.decodeResource(getResources(), R.drawable.sample_plot_3);Stamper.with(MainActivity.this)      .setLabel("National Geography")      .setLabelColor(getResources().getColor(R.color.theme))//Color.rgb(255, 60, 70)      .setLabelSize(60)      .setMasterBitmap(bitmap3)      .setStampType(StampType.TEXT)      .setStampPadding(new StampPadding(bitmap3.getWidth() / 4, bitmap3.getHeight() / 6))      .setStampWatcher(mStampWatcher)      .setRequestId(1001)      .build();

2.use it stamp a image;

Bitmap bitmap4 = BitmapFactory.decodeResource(getResources(), R.drawable.sample_plot_4);Bitmap watermark = BitmapFactory.decodeResource(getResources(), R.drawable.ic_watermark);Stamper.with(MainActivity.this)      .setMasterBitmap(bitmap4)      .setWatermark(watermark)      .setStampType(StampType.IMAGE)      .setStampPadding(new StampPadding(bitmap4.getWidth() - watermark.getWidth() - 40, 40))      .setStampWatcher(mStampWatcher)      .setRequestId(1002)      .build();

3.the callback

StampWatcher mStampWatcher = new StampWatcher() {        @Override        protected void onSuccess(Bitmap bitmap, int requestId) {            super.onSuccess(bitmap, requestId);            switch (requestId) {                case 1001:                    //the result of text stamper                    break;                case 1002:                    //the result of image stamper                    break;            }        }        @Override        protected void onError(String error, int requestId) {            super.onError(error, requestId);            switch (requestId) {                case 1001://                    break;                case 1002://                    break;            }        }    };

完成代码见github：

https://github.com/KernHu/Stamper