自定义查看实际手写触摸签名并保存成图片_Java_下载.zip

package gesturesignature.fengunion.com.gesturesignature; import android.content.Context; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Matrix; import android.graphics.Paint; import android.graphics.PaintFlagsDrawFilter; import android.graphics.Path; import android.graphics.PorterDuff; import android.net.Uri; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; /** * @author shuang * @date 2016/11/2 */ public class GestureSignatureView extends View { private static final String TAG = "GestureSignatureView"; private Path mPath;//绘制路径 private Paint mPaint;// 绘制画笔 private Canvas mCanvas;//背景画布 private Bitmap mMBitmap;//背景bitmap private boolean isTouchedSignature = false;//是否签名 public GestureSignatureView(Context context) { this(context, null); } public GestureSignatureView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public GestureSignatureView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); initPaint(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); Log.d(TAG, "onMeasure: 测量的宽高：" + getMeasuredWidth() + "-----------" + getMeasuredHeight()); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { super.onLayout(changed, left, top, right, bottom); mMBitmap = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888); mCanvas = new Canvas(mMBitmap); mCanvas.drawColor(Color.TRANSPARENT); mCanvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG)); isTouchedSignature = false; } private void initPaint() { mPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mPaint.setColor(Color.BLACK); mPaint.setStrokeWidth(10.0f); mPaint.setStrokeCap(Paint.Cap.ROUND); mPaint.setStyle(Paint.Style.STROKE); mPaint.setStrokeJoin(Paint.Join.ROUND); mPaint.setDither(true); mPath = new Path(); } @Override protected void onDraw(Canvas canvas) { canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG)); canvas.drawBitmap(mMBitmap, 0, 0, mPaint); // 通过画布绘制多点形成的图形 canvas.drawPath(mPath, mPaint); } private float[] downPoint = new float[2]; private float[] previousPoint = new float[2]; @Override public boolean onTouchEvent(MotionEvent event) { downPoint[0] = event.getX(); downPoint[1] = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: previousPoint[0] = downPoint[0]; previousPoint[1] = downPoint[1]; mPath.moveTo(downPoint[0], downPoint[1]); break; case MotionEvent.ACTION_MOVE: float dX = Math.abs(downPoint[0] - previousPoint[0]); float dY = Math.abs(downPoint[1] - previousPoint[1]); // 两点之间的距离大于等于3时，生成贝塞尔绘制曲线 if (dX >= 3 || dY >= 3) { // 设置贝塞尔曲线的操作点为起点和终点的一半 float cX = (downPoint[0] + previousPoint[0]) / 2; float cY = (downPoint[1] + previousPoint[1]) / 2; // 二次贝塞尔，实现平滑曲线；previousX, previousY为操作点，cX, cY为终点 mPath.quadTo(previousPoint[0], previousPoint[1], cX, cY); // 第二次执行时，第一次结束调用的坐标值将作为第二次调用的初始坐标值 previousPoint[0] = downPoint[0]; previousPoint[1] = downPoint[1]; } // float moveCurrentX = downPoint[0]; // float moveCurrentY = downPoint[1]; // mPath.quadTo(moveCurrentX, moveCurrentY, downPoint[0], downPoint[1]); break; case MotionEvent.ACTION_UP: mCanvas.drawPath(mPath, mPaint); mPath.reset(); break; } invalidate(); return true; } // 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, 0, 0, originWidth, originHeight, matrix, true); return resizedBitmap; } public Bitmap getPaintBitmap() { return resizeImage(mMBitmap, 320, 480); } public void clear() { if (mCanvas != null) { isTouchedSignature = false; mPath.reset(); mCanvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR); invalidate(); } } /** * 保存画板 * * @param path 保存到路劲 */ public void save(String path) throws IOException { save(path, false, 0); } /** * 保存画板 * * @param path 保存到路劲 * @param clearBlank 是否清楚空白区域 * @param blank 边缘空白区域 */ public void save(String path, boolean clearBlank, int blank) throws IOException { Bitmap bitmap = mMBitmap; //BitmapUtil.createScaledBitmapByHeight(srcBitmap, 300);// 压缩图片 if (clearBlank) { bitmap = clearBlank(mMBitmap, blank); } Bitmap newBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(newBitmap); canvas.drawColor(Color.WHITE); canvas.setDrawFilter(new PaintFlagsDrawFilter(0, Paint.ANTI_ALIAS_FLAG | Paint.FILTER_BITMAP_FLAG)); canvas.drawBitmap(bitmap, 0, 0, null); ByteArrayOutputStream bos = new ByteArrayOutputStream(); newBitmap.compress(Bitmap.CompressFormat.JPEG, 100, bos); byte[] buffer = bos.toByteArray(); if (buffer != null) { File file = new File(path); if (file.exists()) { file.delete(); } OutputStream outputStream = new FileOutputStream(file); outputStream.write(buffer); outputStream.close(); scanMediaFile(file); } } /** * 是否有签名 * * @return */ public boolean getTouched() { return isTouchedSignature; } /** * 逐行扫描 清楚边界空白。 * * @param bp * @param blank 边距留多少个像素 * @return */ private Bitmap clearBlank(Bitmap bp, int blank) { int HEIGHT = bp.getHeight(); int WIDTH = bp.getWidth(); int top = 0, left = 0, right = 0, bottom = 0; int[] pixs = new int[WIDTH]; boolean isStop; for (int y = 0; y < HEIGHT; y++) { bp.getPixels(pixs, 0, WIDTH, 0, y, WIDTH, 1); isStop = false; for (int pix : pixs) { if (pix != Color.TRANSPARENT) { top = y; isStop = true; break; }