上一篇文章我们介绍了如何实现在画板上海书写,其过程相对来说是比较简单的,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……