android-------手写签名系统的设计与实现之实现画笔设置
引自:http://www.xuebuyuan.com/1754358.html
既然我们实现了画布和画笔,也实现了手写,为了提高可用性,我们增加了对画笔风格的设置功能,这样就可以根据自己的需要选择画笔的颜色、粗细、风格(铅笔、浮雕、水彩等)效果。今天我们就介绍画笔风格的设置功能的实现过程,先看看效果图:
一、实现原理:
1、对话款我们用的是popupwindow,不是alertdialog对话框,两者是有区别的:前者是阻塞型,即popupwindow会阻塞主线程,当popupwindow弹出来后,主线程暂停工作,只有popupwindow退出后,主线程才会恢复;alertdialog是非阻塞型,即不会影响到主线程的工作。两者在实现过程中,都是将自定义的布局嵌入到其里面。对于popupwindow对话框的实现,之前的博客【android开发】手机应用管理器的实现之实现popupWindow类对话框(二)已经介绍了,这里就不在介绍了。
2、
为了更好地显示当前选择画笔的实际效果,我们做了动态预览,这是自定义两个view:ShowLineView和PenCircleView,来完成相应的操作。
3、由于今天要创建的文件比较多,我们来先看一下项目的目录结构图:
二、实现过程:
首先我们新建一个布局文件pen_set.xml,代码如下:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/setpenlayout" android:layout_width="wrap_content" android:layout_height="360dp" android:orientation="horizontal" android:background="@drawable/grey_layout"> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical" android:paddingLeft="7dip"> <FrameLayout android:layout_width="195dip" android:layout_height="60dip" android:background="@drawable/white_layout" android:layout_marginRight="5dp" android:layout_marginTop="5dp" > <LinearLayout android:orientation="horizontal" android:paddingRight="12dip" android:layout_width="195dip" android:id="@+id/penShowLayout" android:layout_height="60dip" > </LinearLayout> </FrameLayout> <LinearLayout android:id="@+id/sizeSelectLayoutPen" android:layout_width="195dip" android:layout_height="40dip" android:orientation="horizontal" android:background="@drawable/darkgrey_layout" android:layout_marginRight="5dp" android:layout_marginTop="5dp" android:focusable="false" android:paddingRight="12dip"> <SeekBar android:id="@+id/penSizeSeekBar" android:layout_width="140dp" android:layout_marginLeft="10dp" android:max="30" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:maxHeight="5dp" android:progressDrawable="@drawable/seekbar_bg_img" /> <LinearLayout android:id="@+id/penSizeShowLayout" android:layout_marginTop="10dp" android:layout_width="40dp" android:layout_height="40dp" android:layout_gravity="center_vertical" android:layout_marginLeft="6dp" android:orientation="horizontal"></LinearLayout> </LinearLayout> <LinearLayout android:orientation="horizontal" android:paddingRight="12dip" android:layout_width="195dip" android:id="@+id/pen_style_seclct" android:layout_height="60dip" android:background="@drawable/deepgrey_layout" android:layout_marginRight="5dp" android:layout_marginTop="5dp"> <RadioGroup android:id="@+id/penRaidoGroup1" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" android:layout_marginTop="8dip"> <RadioButton android:id="@+id/buttonBlurPen" android:layout_weight="1" android:layout_width="0dip" android:button="@null" android:layout_height="wrap_content" android:background="@drawable/plainpen" > </RadioButton> <RadioButton android:id="@+id/buttonEmboss" android:layout_weight="1" android:layout_width="0dip" android:button="@null" android:layout_height="wrap_content" android:background="@drawable/embosspen"> </RadioButton> <RadioButton android:id="@+id/buttonPlainPen" android:layout_weight="1" android:layout_width="0dip" android:button="@null" android:layout_height="wrap_content" android:background="@drawable/blurpen"> </RadioButton> <RadioButton android:id="@+id/buttonSelectBackGroundColor" android:layout_weight="1" android:layout_width="0dip" android:button="@null" android:layout_height="wrap_content" android:background="@drawable/fourpen"> </RadioButton> </RadioGroup> </LinearLayout> <LinearLayout android:layout_width="195dip" android:background="@drawable/verygrey_layout" android:layout_marginBottom="10dp" android:layout_marginRight="5dp" android:layout_marginTop="5dp" android:layout_height="75dip" android:id="@+id/LinearLayoutColor" android:paddingLeft="7dip" android:orientation="vertical" android:paddingRight="10dip"> <LinearLayout android:layout_width="wrap_content" android:layout_height="28dip" android:orientation="horizontal" android:layout_marginTop="7dip"> <RadioGroup android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/radioGroupColor" android:orientation="horizontal" ></RadioGroup> </LinearLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="28dip" android:orientation="horizontal" > <RadioGroup android:layout_width="wrap_content" android:layout_height="fill_parent" android:id="@+id/radioGroupColor2" android:orientation="horizontal" ></RadioGroup> </LinearLayout> </LinearLayout> </LinearLayout> <RelativeLayout android:id="@+id/savedPenLayout" android:layout_width="45dp" android:layout_height="252dp" android:layout_marginBottom="10dp" android:layout_marginRight="5dp" android:layout_marginTop="5dp" android:background="@drawable/verygrey_layout" android:orientation="vertical" > </RelativeLayout> </LinearLayout>
在mudpdfactivity中先初始化控件:
/** * 功能:初始化设置画笔popupwindow视图里面的控件 */ public void initialSetPenBtV(){ penSetView = getLayoutInflater().inflate(R.layout.pen_set, null); setpenlayout = (LinearLayout) penSetView.findViewById(R.id.setpenlayout) ; penShowLayout = (LinearLayout) penSetView.findViewById(R.id.penShowLayout) ; penSizeSeekBar = (SeekBar) penSetView.findViewById(R.id.penSizeSeekBar) ; penSizeShowLayout = (LinearLayout) penSetView.findViewById(R.id.penSizeShowLayout) ; colorRadioGroup = (RadioGroup) penSetView.findViewById(R.id.radioGroupColor); colorRadioGroup2 = (RadioGroup) penSetView.findViewById(R.id.radioGroupColor2); //plainpen = (RadioButton) penSetView.findViewById(R.id.buttonPlainPen); penRadioGroupf = (RadioGroup) penSetView.findViewById(R.id.penRaidoGroup1); penSizeSeekBar.setOnSeekBarChangeListener(this); showLineView = new ShowLineView(this) ; penShowLayout.addView(showLineView); penCircleView = new PenCircleView(this) ; penSizeShowLayout.addView(penCircleView,40,40); showLineView.setAttr(6, Color.BLACK, mPenType) ; initpenRadioGroupf(penSetView); }
我们是在长按事件中弹出对话框:
@Override public boolean onLongClick(View v) { // TODO Auto-generated method stub updateLineShow(); if(penSetPop == null){ penSetPop = new PopupWindow(penSetView,LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT); penSetPop.setBackgroundDrawable(getResources().getDrawable(R.drawable.popover_background_left)); penSetPop.setFocusable(true); penSetPop.setOutsideTouchable(true); penSetPop.showAsDropDown(mAddPicButton,0,0); initColorViews(); }else{ penSetPop.setFocusable(true); penSetPop.setOutsideTouchable(true); penSetPop.showAsDropDown(mAddPicButton,0,0); penSetPop.update(); } return true;//返回false时,点击事件还会响应;返回true,长按事件后点击事件就不响应了 }
画笔的样式我们共做了四种样式,分别是铅笔、毛笔、签字笔、水彩笔,样式设置主要是通过类BlurMaskFilter和EmbossMaskFilte,通过改变他们的属性变量值来改变画笔书写效果,比如投影值、透明度等,将类BlurMaskFilter和EmbossMaskFilte的实例对象设置好后通过类Paint的方法:setMaskFilter()来传给画笔paint
/** * 功能:设置画笔风格 * @param mPaintType * @return */ private MaskFilter getMaskFilter(int mPaintType){ MaskFilter maskFilter = null; switch (mPaintType) { case PEN_TYPE.PLAIN_PEN://签字笔风格 maskFilter = null; break; case PEN_TYPE.BLUR://铅笔模糊风格 maskFilter = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL); break; case PEN_TYPE.EMBOSS://毛笔浮雕风格 maskFilter = new EmbossMaskFilter(new float[] { 1, 1, 1 }, 0.4f, 6, 3.5f); break; case PEN_TYPE.TS_PEN://透明水彩风格 maskFilter = null; mPenPaint.setAlpha(50); break; default: maskFilter = null; break; } mPenPaint.setMaskFilter(maskFilter); return maskFilter; }
在对话框中我们四个画笔选项:
/** * 功能:操作设置画笔风格 * @param view */ private void initpenRadioGroupf(View view) { plainpen = (RadioButton) view.findViewById(R.id.buttonPlainPen); plainpen.setChecked(true); penRadioGroupf .setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { @Override public void onCheckedChanged(RadioGroup group, int checkedId) { if (checkedId == -1) { return; } switch (checkedId) { case R.id.buttonBlurPen: setToolTyle(PEN_TYPE.BLUR); break; case R.id.buttonEmboss: setToolTyle(PEN_TYPE.EMBOSS); break; case R.id.buttonPlainPen: setToolTyle(PEN_TYPE.PLAIN_PEN); break; case R.id.buttonSelectBackGroundColor: setToolTyle(PEN_TYPE.TS_PEN); break; default: break; } updateLineShow(); } }); } /** * 功能:设置画笔的样式 * */ private void setToolTyle(int type) { //mPaintView.setCurrentPainterType(type); mPenType = type; }
同时我们设置了十种颜色的选项,通过RadioGroup控件来动态添加选项,每一组五种,分成两组:
/** * 功能:显示颜色选择视图ColorRadioGroup */ private void initColorRadioGroup() { mColorViewList = new ArrayList<ColorView>(); mColorViewList.add(colorView1); mColorViewList.add(colorView2); mColorViewList.add(colorView3); mColorViewList.add(colorView4); mColorViewList.add(colorView5); RadioGroup.LayoutParams params = new RadioGroup.LayoutParams( COLOR_VIEW_SIZE, COLOR_VIEW_SIZE); params.setMargins(1, 2, 6, 6); for (ColorView colorView : mColorViewList) { colorRadioGroup.addView(colorView, params); colorView.setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { for (ColorView colorView : mColorViewList) { if (buttonView.equals(colorView) && buttonView.isChecked()) { colorRadioGroup2.clearCheck(); penColor = colorView.getColor(); updateLineShow(); } } } }); } } /** * 功能:显示颜色选择视图ColorRadioGroup2 */ private void initColorRadioGroup2() { mColorViewList2 = new ArrayList<ColorView>(); mColorViewList2.add(colorView7); mColorViewList2.add(colorView8); //mColorViewList.add(colorView9); mColorViewList2.add(colorView10); mColorViewList2.add(colorView11); //mColorViewList.add(colorView12); mColorViewList2.add(colorView13); RadioGroup.LayoutParams params = new RadioGroup.LayoutParams( COLOR_VIEW_SIZE, COLOR_VIEW_SIZE); params.setMargins(1, 2, 6, 6); for (ColorView colorView2 : mColorViewList2) { colorRadioGroup2.addView(colorView2, params); colorView2.setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { for (ColorView colorView2 : mColorViewList2) { if (buttonView.equals(colorView2) && buttonView.isChecked()) { //set the first row unchecked colorRadioGroup.clearCheck(); penColor = colorView2.getColor(); updateLineShow(); } } } }); } }选中后更新两个view: /** * 功能:更新画笔线条的粗细 */ private void updateLineShow(){ showLineView.setAttr(penSize, penColor, mPenType) ; penCircleView.penAttrChange(penSize, penColor) ; //ColorDrawable colorDrawable = new ColorDrawable(mPaintView.getPenColor()) ; //pencolor.setBackgroundColor(mPaintView.getPenColor()) ; }
进度条来设置画笔的粗细:
@Override public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) { // TODO Auto-generated method stub penSize = progress; updateLineShow(); }
这样设置对话框基本就完成了,我们设置好,要将相应的数值传递给画笔,我们是通过三个全局变量来保存画笔的颜色、粗细、风格的。
paint.setColor(MuPDFActivity.penColor); //设置画笔的颜色 paint.setStrokeWidth(MuPDFActivity.penSize);//设置画笔的粗细 getMaskFilter(MuPDFActivity.mPenType);
当然了我们在实现过程中远比这要复杂,我们创建了几个画笔的接口文件已经封装了几个工具类,我们就不详细说了,可以看看项目的源码。好了,到此今天我们的任务就算结束了,现在读取pdf和书写画板都实现了,剩下就是怎么在pdf上签名了,下一篇我们将继续介绍最关键的一部分-在pdf文件上添加签名。欢迎大家继续关注,由于今天的代码比较多,在文章的最后面我们会将今天的代码分享给大家,项目运行是正常的,如果你在运行中出现问题,请在博客下面留言,大家一起讨论……
源码下载:http://download.csdn.net/detail/lixinhuixin/6709451