Android仿银行客户签名并且保存签名的截图文件并命名为本地时间

package com.android.tcm.view;
import android.content.context;
import android.graphics.bitmap;
import android.graphics.bitmap.config;
import android.graphics.canvas;
import android.graphics.color;
import android.graphics.paint;
import android.graphics.path;
import android.graphics.porterduff.mode;
import android.graphics.porterduffxfermode;
import android.util.attributeset;
import android.view.motionevent;
import android.view.view;
public class signview extends view {
  private paint paint;
  private canvas cachecanvas;
  private bitmap cachebbitmap;
  private path path;
  static final int background_color = color.white;
  static final int brush_color = color.black;
  public signview(context context, attributeset attrs, int defstyleattr) {
   super(context, attrs, defstyleattr);
   // initview(context);
   // todo auto-generated constructor stub
  }
  public signview(context context, attributeset attrs) {
   super(context, attrs);
   // initview(context);
   // todo auto-generated constructor stub
  }
  public signview(context context) {
   super(context);
   // initview(context);
   // todo auto-generated constructor stub
  }
  public void initview(context context) {
  }
  @override
  protected void onmeasure(int widthmeasurespec, int heightmeasurespec) {
   // todo auto-generated method stub
   super.onmeasure(widthmeasurespec, heightmeasurespec);
   paint = new paint();
   paint.setantialias(true);
   paint.setstrokewidth(3);
   paint.setstyle(paint.style.stroke);
   paint.setcolor(color.red);
   path = new path();
   cachebbitmap = bitmap.createbitmap(
      measurespec.getsize(widthmeasurespec),
      measurespec.getsize(heightmeasurespec), config.argb_8888);
   cachecanvas = new canvas(cachebbitmap);
   cachecanvas.drawcolor(color.transparent);
  }
  public bitmap getcachebbitmap() {
   return cachebbitmap;
  }
  public void clear() {
   if (cachecanvas != null) {
     paint.setxfermode(new porterduffxfermode(mode.clear));
     cachecanvas.drawpaint(paint); 
     paint = new paint();
     paint.setantialias(true);
     paint.setstrokewidth(3);
     paint.setstyle(paint.style.stroke);
     paint.setcolor(color.red);
     invalidate();
   }
  }
  @override
  protected void ondraw(canvas canvas) {
   // canvas.drawcolor(brush_color);
   canvas.drawbitmap(cachebbitmap, 0, 0, null);
   canvas.drawpath(path, paint);
  }
  @override
  protected void onsizechanged(int w, int h, int oldw, int oldh) {
   int curw = cachebbitmap != null ? cachebbitmap.getwidth() : 0;
   int curh = cachebbitmap != null ? cachebbitmap.getheight() : 0;
   if (curw >= w && curh >= h) {
     return;
   }
   if (curw < w)
     curw = w;
   if (curh < h)
     curh = h;
   bitmap newbitmap = bitmap.createbitmap(curw, curh,
      config.argb_8888);
   canvas newcanvas = new canvas();
   newcanvas.setbitmap(newbitmap);
   if (cachebbitmap != null) {
     newcanvas.drawbitmap(cachebbitmap, 0, 0, null);
   }
   cachebbitmap = newbitmap;
   cachecanvas = newcanvas;
  }
  private float cur_x, cur_y;
  @override
  public boolean ontouchevent(motionevent event) {
   float x = event.getx();
   float y = event.gety();
   switch (event.getaction()) {
   case motionevent.action_down: {
     if(islistener!=null){
      islistener.sign();
     }
     cur_x = x;
     cur_y = y;
     path.moveto(cur_x, cur_y);
     break;
   }
   case motionevent.action_move: {
     path.quadto(cur_x, cur_y, x, y);
     cur_x = x;
     cur_y = y;
     break;
   }
   case motionevent.action_up: {
     cachecanvas.drawpath(path, paint);
     path.reset();
     break;
   }
   }
   invalidate();
   return true;
  }
  public interface issignlistener{
   void sign();
  }
  issignlistener islistener;
  public void setislistener(issignlistener islistener) {
   this.islistener = islistener;
  }
}

<?xml version="1.0" encoding="utf-8"?>
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
  <relativelayout
    android:id="@+id/rl"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white">
    <framelayout
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:layout_marginbottom="40dp">
      <com.android.tcm.view.signview
        android:id="@+id/signview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />
    </framelayout>
    <linearlayout
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_alignparentbottom="true"
      android:layout_centerhorizontal="true"
      android:orientation="horizontal">
      <textview
        android:id="@+id/tv_clear"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:paddingbottom="15dp"
        android:paddingtop="15dp"
        android:text="擦除重签"
        android:textsize="18sp" />
      <textview
        android:id="@+id/tv_commit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginleft="20dp"
        android:gravity="center"
        android:paddingbottom="15dp"
        android:paddingtop="15dp"
        android:text="确认"
        android:textsize="18sp" />
    </linearlayout>
  </relativelayout>
</relativelayout>

package com.android.tcm.activity;
import android.graphics.bitmap;
import android.os.bundle;
import android.os.environment;
import android.view.view;
import android.widget.relativelayout;
import android.widget.textview;
import com.android.tcm.r;
import com.android.tcm.view.signview;
import java.io.bytearrayoutputstream;
import java.io.file;
import java.io.fileoutputstream;
import java.io.ioexception;
import java.text.simpledateformat;
import java.util.date;
/**
 * created by sf.
 */
public class signactivity extends activity {
  private relativelayout rl;
  private signview mview;
  private textview commit, clear;
  private bitmap msignbitmap;
  private string signpath;
  private long time;
  private string filename;
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_sign);
    initview();
  }
  public void initview() {
    mview = (signview) findviewbyid(r.id.signview);
    commit = (textview) findviewbyid(r.id.tv_commit);
    clear = (textview) findviewbyid(r.id.tv_clear);
    rl= (relativelayout) findviewbyid(r.id.rl);
    commit.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view arg0) {
//        commit.getdrawingcache();//获取控件的截图
//        savesign(bitmaputil.myshot(signactivity.this));
        rl.setdrawingcacheenabled(true);
        savesign(rl.getdrawingcache());
        rl.setdrawingcacheenabled(false);
      }
    });
    clear.setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view arg0) {
        mview.clear();
      }
    });
  }
  /**
   * signpath是图片保存路径
   *
   * @param bit
   */
  public void savesign(bitmap bit) {
    time = system.currenttimemillis();
    filename = getdatetimefrommillisecond(time);
    msignbitmap = bit;
    signpath = createfile();
  }
  /**
   * @return
   */
  private string createfile() {
    bytearrayoutputstream baos = null;
    string _path = null;
    try {
      string sign_dir = environment.getexternalstoragedirectory()
          .getpath() + "/" + "tcm" + "/";
      file dir = new file(sign_dir);
      if (!dir.exists()) {
        dir.mkdirs();
      }
      _path = sign_dir + filename + ".jpg";
      baos = new bytearrayoutputstream();
      msignbitmap.compress(bitmap.compressformat.jpeg, 100, baos);
      byte[] photobytes = baos.tobytearray();
      if (photobytes != null) {
        new fileoutputstream(new file(_path)).write(photobytes);
      }
    } catch (ioexception e) {
      e.printstacktrace();
    } finally {
      try {
        if (baos != null)
          baos.close();
      } catch (ioexception e) {
        e.printstacktrace();
      }
    }
    return _path;
  }
  @override
  protected void ondestroy() {
    // todo auto-generated method stub
    super.ondestroy();
    if (msignbitmap != null) {
      msignbitmap.recycle();
    }
  }
  /**
   * 将毫秒转化成固定格式的时间
   * 时间格式: yyyy-mm-dd hh:mm:ss
   *
   * @param millisecond
   * @return
   */
  public static string getdatetimefrommillisecond(long millisecond) {
    simpledateformat simpledateformat = new simpledateformat("yyyy-mm-dd hh:mm:ss");
    date date = new date(millisecond);
    string datestr = simpledateformat.format(date);
    return datestr;
  }
}