Android给图片加文字和图片水印实例代码

2024-02-24 23:44:03 57

我们在做项目的时候有时候需要给图片添加水印，水寒今天就遇到了这样的问题，所以搞了一个工具类，贴出来大家直接调用就行。

/**
*图片工具类
*@author水寒
*
*/
publicclassImageUtil{

/**
*设置水印图片在左上角
*@paramContext
*@paramsrc
*@paramwatermark
*@parampaddingLeft
*@parampaddingTop
*@return
*/
publicstaticBitmapcreateWaterMaskLeftTop(
Contextcontext,Bitmapsrc,Bitmapwatermark,
intpaddingLeft,intpaddingTop){
returncreateWaterMaskBitmap(src,watermark,
dp2px(context,paddingLeft),dp2px(context,paddingTop));
}

privatestaticBitmapcreateWaterMaskBitmap(Bitmapsrc,Bitmapwatermark,
intpaddingLeft,intpaddingTop){
if(src==null){
returnnull;
}
intwidth=src.getWidth();
intheight=src.getHeight();
//创建一个bitmap
Bitmapnewb=Bitmap.createBitmap(width,height,Config.ARGB_8888);//创建一个新的和SRC长度宽度一样的位图
//将该图片作为画布
Canvascanvas=newCanvas(newb);
//在画布0，0坐标上开始绘制原始图片
canvas.drawBitmap(src,0,0,null);
//在画布上绘制水印图片
canvas.drawBitmap(watermark,paddingLeft,paddingTop,null);
//保存
canvas.save(Canvas.ALL_SAVE_FLAG);
//存储
canvas.restore();
returnnewb;
}

/**
*设置水印图片在右下角
*@paramContext
*@paramsrc
*@paramwatermark
*@parampaddingRight
*@parampaddingBottom
*@return
*/
publicstaticBitmapcreateWaterMaskRightBottom(
Contextcontext,Bitmapsrc,Bitmapwatermark,
intpaddingRight,intpaddingBottom){
returncreateWaterMaskBitmap(src,watermark,
src.getWidth()-watermark.getWidth()-dp2px(context,paddingRight),
src.getHeight()-watermark.getHeight()-dp2px(context,paddingBottom));
}

/**
*设置水印图片到右上角
*@paramContext
*@paramsrc
*@paramwatermark
*@parampaddingRight
*@parampaddingTop
*@return
*/
publicstaticBitmapcreateWaterMaskRightTop(
Contextcontext,Bitmapsrc,Bitmapwatermark,
intpaddingRight,intpaddingTop){
returncreateWaterMaskBitmap(src,watermark,
src.getWidth()-watermark.getWidth()-dp2px(context,paddingRight),
dp2px(context,paddingTop));
}

/**
*设置水印图片到左下角
*@paramContext
*@paramsrc
*@paramwatermark
*@parampaddingLeft
*@parampaddingBottom
*@return
*/
publicstaticBitmapcreateWaterMaskLeftBottom(
Contextcontext,Bitmapsrc,Bitmapwatermark,
intpaddingLeft,intpaddingBottom){
returncreateWaterMaskBitmap(src,watermark,dp2px(context,paddingLeft),
src.getHeight()-watermark.getHeight()-dp2px(context,paddingBottom));
}

/**
*设置水印图片到中间
*@paramContext
*@paramsrc
*@paramwatermark
*@return
*/
publicstaticBitmapcreateWaterMaskCenter(Bitmapsrc,Bitmapwatermark){
returncreateWaterMaskBitmap(src,watermark,
(src.getWidth()-watermark.getWidth())/2,
(src.getHeight()-watermark.getHeight())/2);
}

/**
*给图片添加文字到左上角
*@paramcontext
*@parambitmap
*@paramtext
*@return
*/
publicstaticBitmapdrawTextToLeftTop(Contextcontext,Bitmapbitmap,Stringtext,
intsize,intcolor,intpaddingLeft,intpaddingTop){
Paintpaint=newPaint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(color);
paint.setTextSize(dp2px(context,size));
Rectbounds=newRect();
paint.getTextBounds(text,0,text.length(),bounds);
returndrawTextToBitmap(context,bitmap,text,paint,bounds,
dp2px(context,paddingLeft),
dp2px(context,paddingTop)+bounds.height());
}

/**
*绘制文字到右下角
*@paramcontext
*@parambitmap
*@paramtext
*@paramsize
*@paramcolor
*@parampaddingLeft
*@parampaddingTop
*@return
*/
publicstaticBitmapdrawTextToRightBottom(Contextcontext,Bitmapbitmap,Stringtext,
intsize,intcolor,intpaddingRight,intpaddingBottom){
Paintpaint=newPaint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(color);
paint.setTextSize(dp2px(context,size));
Rectbounds=newRect();
paint.getTextBounds(text,0,text.length(),bounds);
returndrawTextToBitmap(context,bitmap,text,paint,bounds,
bitmap.getWidth()-bounds.width()-dp2px(context,paddingRight),
bitmap.getHeight()-dp2px(context,paddingBottom));
}

/**
*绘制文字到右上方
*@paramcontext
*@parambitmap
*@paramtext
*@paramsize
*@paramcolor
*@parampaddingRight
*@parampaddingTop
*@return
*/
publicstaticBitmapdrawTextToRightTop(Contextcontext,Bitmapbitmap,Stringtext,
intsize,intcolor,intpaddingRight,intpaddingTop){
Paintpaint=newPaint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(color);
paint.setTextSize(dp2px(context,size));
Rectbounds=newRect();
paint.getTextBounds(text,0,text.length(),bounds);
returndrawTextToBitmap(context,bitmap,text,paint,bounds,
bitmap.getWidth()-bounds.width()-dp2px(context,paddingRight),
dp2px(context,paddingTop)+bounds.height());
}

/**
*绘制文字到左下方
*@paramcontext
*@parambitmap
*@paramtext
*@paramsize
*@paramcolor
*@parampaddingLeft
*@parampaddingBottom
*@return
*/
publicstaticBitmapdrawTextToLeftBottom(Contextcontext,Bitmapbitmap,Stringtext,
intsize,intcolor,intpaddingLeft,intpaddingBottom){
Paintpaint=newPaint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(color);
paint.setTextSize(dp2px(context,size));
Rectbounds=newRect();
paint.getTextBounds(text,0,text.length(),bounds);
returndrawTextToBitmap(context,bitmap,text,paint,bounds,
dp2px(context,paddingLeft),
bitmap.getHeight()-dp2px(context,paddingBottom));
}

/**
*绘制文字到中间
*@paramcontext
*@parambitmap
*@paramtext
*@paramsize
*@paramcolor
*@return
*/
publicstaticBitmapdrawTextToCenter(Contextcontext,Bitmapbitmap,Stringtext,
intsize,intcolor){
Paintpaint=newPaint(Paint.ANTI_ALIAS_FLAG);
paint.setColor(color);
paint.setTextSize(dp2px(context,size));
Rectbounds=newRect();
paint.getTextBounds(text,0,text.length(),bounds);
returndrawTextToBitmap(context,bitmap,text,paint,bounds,
(bitmap.getWidth()-bounds.width())/2,
(bitmap.getHeight()+bounds.height())/2);
}

//图片上绘制文字
privatestaticBitmapdrawTextToBitmap(Contextcontext,Bitmapbitmap,Stringtext,
Paintpaint,Rectbounds,intpaddingLeft,intpaddingTop){
android.graphics.Bitmap.ConfigbitmapConfig=bitmap.getConfig();

paint.setDither(true);//获取跟清晰的图像采样
paint.setFilterBitmap(true);//过滤一些
if(bitmapConfig==null){
bitmapConfig=android.graphics.Bitmap.Config.ARGB_8888;
}
bitmap=bitmap.copy(bitmapConfig,true);
Canvascanvas=newCanvas(bitmap);

canvas.drawText(text,paddingLeft,paddingTop,paint);
returnbitmap;
}

/**
*缩放图片
*@paramsrc
*@paramw
*@paramh
*@return
*/
publicstaticBitmapscaleWithWH(Bitmapsrc,doublew,doubleh){
if(w==0||h==0||src==null){
returnsrc;
}else{
//记录src的宽高
intwidth=src.getWidth();
intheight=src.getHeight();
//创建一个matrix容器
Matrixmatrix=newMatrix();
//计算缩放比例
floatscaleWidth=(float)(w/width);
floatscaleHeight=(float)(h/height);
//开始缩放
matrix.postScale(scaleWidth,scaleHeight);
//创建缩放后的图片
returnBitmap.createBitmap(src,0,0,width,height,matrix,true);
}
}

/**
*dip转pix
*@paramcontext
*@paramdp
*@return
*/
publicstaticintdp2px(Contextcontext,floatdp){
finalfloatscale=context.getResources().getDisplayMetrics().density;
return(int)(dp*scale+0.5f);
}
}

使用方法如下：

添加一个布局，上面是原始图片，下面是添加水印后的图片

在Activity中获取到ImageView对象，并且获取Bitmap对象，对Bitmap进行canva绘图，添加水印：

/**
*图片工具类
*@author水寒
*
*/
publicclassMainActivityextendsActivity{

privateImageViewmSourImage;
privateImageViewmWartermarkImage;

@Override
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

initView();
}

privatevoidinitView(){
mSourImage=(ImageView)findViewById(R.id.sour_pic);
mWartermarkImage=(ImageView)findViewById(R.id.wartermark_pic);
BitmapsourBitmap=BitmapFactory.decodeResource(getResources(),R.drawable.sour_pic);
mSourImage.setImageBitmap(sourBitmap);

BitmapwaterBitmap=BitmapFactory.decodeResource(getResources(),R.drawable.weixin);

BitmapwatermarkBitmap=ImageUtil.createWaterMaskCenter(sourBitmap,waterBitmap);
watermarkBitmap=ImageUtil.createWaterMaskLeftBottom(this,watermarkBitmap,waterBitmap,0,0);
watermarkBitmap=ImageUtil.createWaterMaskRightBottom(this,watermarkBitmap,waterBitmap,0,0);
watermarkBitmap=ImageUtil.createWaterMaskLeftTop(this,watermarkBitmap,waterBitmap,0,0);
watermarkBitmap=ImageUtil.createWaterMaskRightTop(this,watermarkBitmap,waterBitmap,0,0);

BitmaptextBitmap=ImageUtil.drawTextToLeftTop(this,watermarkBitmap,"左上角",16,Color.RED,0,0);
textBitmap=ImageUtil.drawTextToRightBottom(this,textBitmap,"右下角",16,Color.RED,0,0);
textBitmap=ImageUtil.drawTextToRightTop(this,textBitmap,"右上角",16,Color.RED,0,0);
textBitmap=ImageUtil.drawTextToLeftBottom(this,textBitmap,"左下角",16,Color.RED,0,0);
textBitmap=ImageUtil.drawTextToCenter(this,textBitmap,"中间",16,Color.RED);

mWartermarkImage.setImageBitmap(textBitmap);
}
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。

Android给图片加文字和图片水印实例代码

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