[android开发]手写签名系统的设计与实现之实现画笔设置（四）

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：

		    <framelayout android:background="@drawable/white_layout" android:layout_height="60dip" android:layout_marginright="5dp" android:layout_margintop="5dp" android:layout_width="195dip">				 	</framelayout>  							    				    							    			    												    																										    			    	

/**	 * 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);	}

@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	}

/**     * 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;	    }

/**	 * 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;	}

/**	 * 功能：显示颜色选择视图ColorRadioGroup	 */	private void initColorRadioGroup() {		mColorViewList = new ArrayList();		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();		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();						}					}				}			});		}	}

/**	 * 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()) ;	}

@Override	public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser) {		// TODO Auto-generated method stub		penSize = progress;		updateLineShow();	}

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);