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="擦除重簽"        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="確認"        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();//獲取控件的截圖//        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是圖片保存路徑   *   * @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();    }  }  /**   * 將毫秒轉化成固定格式的時間   * 時間格式: 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;  }}