Android实现签名涂鸦手写板

<?xml version="1.0" encoding="utf-8"? 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical" 

  <FrameLayout
    android:id="@+id/fl_signature"
    android:layout_width="fill_parent"
    android:layout_height="200dp"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="10dp"
    android:background="@drawable/singature_bg"
    android:gravity="top" 
  </FrameLayout 
  <ImageView
    android:id="@+id/iv_signature"
    android:layout_width="fill_parent"
    android:layout_height="200dp"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="10dp"
    android:background="@drawable/signature_shape"
    android:gravity="top"
    android:visibility="gone"/ 

  <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_marginBottom="20dp" 

        <TextView
          android:id="@+id/tv_revert_signature"
          android:layout_width="100dp"
          android:layout_height="35dp"
          android:layout_alignParentRight="true"
          android:layout_marginRight="140dp"
          android:background="@drawable/btn_order_details_pay_bg"
          android:gravity="center"
          android:paddingLeft="30dp"
          android:paddingRight="30dp"
          android:text="重签"
          android:textColor="@color/code_number_bg"
          android:textSize="@dimen/text_title_word" / 

        <TextView
          android:id="@+id/tv_signature_save"
          android:layout_width="100dp"
          android:layout_height="35dp"
          android:layout_alignParentRight="true"
          android:layout_marginRight="20dp"
          android:background="@drawable/bt_bg"
          android:gravity="center"
          android:paddingLeft="30dp"
          android:paddingRight="30dp"
          android:text="保存"
          android:textColor="@color/white"
          android:textSize="@dimen/text_title_word" / 

      </RelativeLayout 



</LinearLayout 

private void StartSignature() {
    // 获取屏幕尺寸
    DisplayMetrics mDisplayMetrics = new DisplayMetrics();
    getWindow().getWindowManager().getDefaultDisplay().getMetrics(mDisplayMetrics);
  }

  @Override
  public void onWindowFocusChanged(boolean hasFocus) {
    super.onWindowFocusChanged(hasFocus);
    if(hasFocus&&mPaintView==null){
      int screenWidth = mFl_signature.getMeasuredWidth();
      int screenHeight = mFl_signature.getMeasuredHeight();
      mPaintView=new PaintView(getApplicationContext(),screenWidth, screenHeight);
      mFl_signature.addView(mPaintView);
      mPaintView.requestFocus();
    }
  }

private void createSignFile() {

    FileOutputStream fos = null;

    File file = null;
    try {
      path= generateImgePath();
      file = new File(path);
      fos = new FileOutputStream(file);

      //如果设置成
      mPaintBitmap.compress(Bitmap.CompressFormat.JPEG, 100, fos);
    } catch (IOException e) {
      e.printStackTrace();
    } finally {
      try {
        if (fos != null) {
          fos.close();
        }

      } catch (IOException e) {
        e.printStackTrace();
      }
    }
  }

if (mPaintView.getPath().isEmpty()){
          ToastUtils.showShort(this,"您还没有签名呦");
        }else {
          mPaintView.clear();

        }