Android编程实现的手写板和涂鸦功能

概述本文实例讲述了Android编程实现的手写板和涂鸦功能。分享给大家供大家参考，具体如下：

本文实例讲述了AndroID编程实现的手写板和涂鸦功能。分享给大家供大家参考，具体如下：

下面仿一个AndroID手写板和涂鸦的功能，直接上代码：

write_pad.xml

<linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"  xmlns:greendroID="http://schemas.androID.com/apk/res/com.cyrilmottIEr.androID.gdcatalog"  androID:layout_wIDth="fill_parent"  androID:layout_height="fill_parent"  androID:orIEntation="vertical" >  <FrameLayout    androID:ID="@+ID/tablet_vIEw"    androID:layout_wIDth="fill_parent"    androID:layout_height="300dp" >  </FrameLayout>  <linearLayout    androID:layout_wIDth="fill_parent"    androID:layout_height="wrap_content"    androID:background="@androID:drawable/bottom_bar"    androID:paddingtop="4dp" >    <button      androID:ID="@+ID/write_pad_ok"      androID:layout_wIDth="wrap_content"      androID:layout_height="wrap_content"      androID:layout_weight="1"      androID:text="确定" />    <button      androID:ID="@+ID/write_pad_clear"      androID:layout_wIDth="wrap_content"      androID:layout_height="wrap_content"      androID:layout_weight="1"      androID:text="清除" />    <button      androID:ID="@+ID/write_pad_cancel"      androID:layout_wIDth="wrap_content"      androID:layout_height="wrap_content"      androID:layout_weight="1"      androID:text="取消" />  </linearLayout></linearLayout>

这个是手写板的主要布局文件，能够手写的部分是一个FrameLayout。下面有确定、清除和取消按钮，用来保存和擦除签名。

主要代码逻辑如下：

MainActivity.java

package com.jackIE.handwriting;import java.io.ByteArrayOutputStream;import java.io.file;import java.io.fileOutputStream;import java.io.IOException;import androID.app.Activity;import androID.graphics.Bitmap;import androID.os.Bundle;import androID.os.Environment;import androID.vIEw.VIEw;import androID.vIEw.VIEw.OnClickListener;import androID.Widget.ImageVIEw;import androID.Widget.TextVIEw;public class MainActivity extends Activity {  private ImageVIEw mIVSign;  private TextVIEw mTVSign;  private Bitmap mSignBitmap;  /** Called when the activity is first created. */  @OverrIDe  public voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    mIVSign = (ImageVIEw) findVIEwByID(R.ID.iv_sign);    mTVSign = (TextVIEw) findVIEwByID(R.ID.tv_sign);    mTVSign.setonClickListener(new OnClickListener() {      @OverrIDe      public voID onClick(VIEw vIEw) {        WritePadDialog mWritePadDialog = new WritePadDialog(            MainActivity.this,new WriteDialogListener() {              @OverrIDe              public voID onPaintDone(Object object) {                mSignBitmap = (Bitmap) object;                createSignfile();                mIVSign.setimageBitmap(mSignBitmap);                mTVSign.setVisibility(VIEw.GONE);              }            });        mWritePadDialog.show();      }    });  }  //创建签名文件  private voID createSignfile() {    ByteArrayOutputStream baos = null;    fileOutputStream fos = null;    String path = null;    file file = null;    try {      path = Environment.getExternalStorageDirectory() + file.separator + System.currentTimeMillis() + ".jpg";      file = new file(path);      fos = new fileOutputStream(file);      baos = new ByteArrayOutputStream();      //如果设置成Bitmap.compress(CompressFormat.JPEG,100,fos) 图片的背景都是黑色的      mSignBitmap.compress(Bitmap.CompressFormat.PNG,baos);      byte[] b = baos.toByteArray();      if (b != null) {        fos.write(b);      }    } catch (IOException e) {      e.printstacktrace();    } finally {      try {        if (fos != null) {          fos.close();        }        if (baos != null) {          baos.close();        }      } catch (IOException e) {        e.printstacktrace();      }    }  }}

PaintVIEw.java

package com.jackIE.handwriting;import androID.content.Context;import androID.graphics.Bitmap;import androID.graphics.Bitmap.Config;import androID.graphics.Canvas;import androID.graphics.color;import androID.graphics.Matrix;import androID.graphics.Paint;import androID.graphics.Path;import androID.graphics.PorterDuff;import androID.vIEw.MotionEvent;import androID.vIEw.VIEw;public class PaintVIEw extends VIEw {  private Paint mPaint;  private Path mPath;  private Bitmap mBitmap;  private Canvas mCanvas;  private int screenWIDth,screenHeight;  private float currentX,currentY;  public PaintVIEw(Context context,int screenWIDth,int screenHeight) {    super(context);    this.screenWIDth = screenWIDth;    this.screenHeight = screenHeight;    init();  }  private voID init() {    mPaint = new Paint();    mPaint.setAntiAlias(true); // 去除锯齿    mPaint.setstrokeWIDth(5);    mPaint.setStyle(Paint.Style.stroke);    mPaint.setcolor(color.BLACK);    mPath = new Path();    mBitmap = Bitmap.createBitmap(screenWIDth,screenHeight,Config.ARGB_8888);    mCanvas = new Canvas(mBitmap);//   mCanvas.drawcolor(color.WHITE);  }  @OverrIDe  protected voID onDraw(Canvas canvas) {    canvas.drawBitmap(mBitmap,null);    canvas.drawPath(mPath,mPaint);  }  @OverrIDe  public boolean ontouchEvent(MotionEvent event) {    float x = event.getX();    float y = event.getY();    switch (event.getAction()) {    case MotionEvent.ACTION_DOWN:      currentX = x;      currentY = y;      mPath.moveto(currentX,currentY);      break;    case MotionEvent.ACTION_MOVE:      currentX = x;      currentY = y;      mPath.quadTo(currentX,currentY,x,y); // 画线      break;    case MotionEvent.ACTION_UP:      mCanvas.drawPath(mPath,mPaint);      break;    }    invalIDate();    return true;  }  public Bitmap getPaintBitmap() {    return resizeImage(mBitmap,320,480);  }  public Path getPath() {    return mPath;  }  // 缩放  public static Bitmap resizeImage(Bitmap bitmap,int wIDth,int height) {    int originWIDth = bitmap.getWIDth();    int originHeight = bitmap.getHeight();    float scaleWIDth = ((float) wIDth) / originWIDth;    float scaleHeight = ((float) height) / originHeight;    Matrix matrix = new Matrix();    matrix.postscale(scaleWIDth,scaleHeight);    Bitmap resizedBitmap = Bitmap.createBitmap(bitmap,originWIDth,originHeight,matrix,true);    return resizedBitmap;  }  //清除画板  public voID clear() {    if (mCanvas != null) {      mPath.reset();      mCanvas.drawcolor(color.transparent,PorterDuff.Mode.CLEAR);      invalIDate();    }  }}

WritePadDialog.java

package com.jackIE.handwriting;import androID.app.Dialog;import androID.content.Context;import androID.os.Bundle;import androID.util.displayMetrics;import androID.vIEw.VIEw;import androID.vIEw.Window;import androID.Widget.button;import androID.Widget.FrameLayout;import androID.Widget.Toast;public class WritePadDialog extends Dialog {  private Context mContext;  private WriteDialogListener mWriteDialogListener;  private PaintVIEw mPaintVIEw;  private FrameLayout mFrameLayout;  private button mBtnOK,mBtnClear,mBtnCancel;  public WritePadDialog(Context context,WriteDialogListener writeDialogListener) {    super(context);    this.mContext = context;    this.mWriteDialogListener = writeDialogListener;  }  @OverrIDe  protected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    requestwindowFeature(Window.FEATURE_NO_Title); //无标题    setContentVIEw(R.layout.write_pad);    mFrameLayout = (FrameLayout) findVIEwByID(R.ID.tablet_vIEw);    // 获取屏幕尺寸    displayMetrics mdisplayMetrics = new displayMetrics();    getwindow().getwindowManager().getDefaultdisplay().getMetrics(mdisplayMetrics);    int screenWIDth = mdisplayMetrics.wIDthPixels;    int screenHeight = mdisplayMetrics.heightPixels;    mPaintVIEw = new PaintVIEw(mContext,screenWIDth,screenHeight);    mFrameLayout.addVIEw(mPaintVIEw);    mPaintVIEw.requestFocus();    mBtnOK = (button) findVIEwByID(R.ID.write_pad_ok);    mBtnOK.setonClickListener(new VIEw.OnClickListener() {      @OverrIDe      public voID onClick(VIEw v) {        if (mPaintVIEw.getPath().isEmpty()) {          Toast.makeText(mContext,"请写下你的大名",Toast.LENGTH_SHORT).show();          return;        }        mWriteDialogListener.onPaintDone(mPaintVIEw.getPaintBitmap());        dismiss();      }    });    mBtnClear = (button) findVIEwByID(R.ID.write_pad_clear);    mBtnClear.setonClickListener(new VIEw.OnClickListener() {      @OverrIDe      public voID onClick(VIEw v) {        mPaintVIEw.clear();      }    });    mBtnCancel = (button) findVIEwByID(R.ID.write_pad_cancel);    mBtnCancel.setonClickListener(new VIEw.OnClickListener() {      @OverrIDe      public voID onClick(VIEw v) {        cancel();      }    });  }}

WriteDilogListener.java

package com.jackIE.handwriting;/** * 监听手写板对话框 * @author chengcj1 * */public interface WriteDialogListener {  public voID onPaintDone(Object object);}

效果如下：

更多关于AndroID相关内容感兴趣的读者可查看本站专题：《Android图形与图像处理技巧总结》、《Android开发入门与进阶教程》、《Android调试技巧与常见问题解决方法汇总》、《Android基本组件用法总结》、《Android视图View技巧总结》、《Android布局layout技巧总结》及《Android控件用法总结》

希望本文所述对大家AndroID程序设计有所帮助。

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