Android自定义手写签名

来源：互联网发布：Linux aarch 64 编辑：程序博客网时间：2024/04/28 00:08
通过android自定义view 自定义手写签名栏，保存在本地相册
package com.exampl.eventdemo.widgets;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;public class SignPadView extends View {    /**     * 记录手指的轨迹信息     */    private Path mPath;    /**     * 绘制样式     */    private Paint mPaint;    /**     * 用于存储Canvas中的图像     */    private Bitmap mBitmap;    /**     * 封装Bitmap, 绘制的内容自动在Bitmap中显示     */    private Canvas mBufferedCanvas;    public SignPadView(Context context) {        this(context, null);    }    public SignPadView(Context context, AttributeSet attrs) {        super(context, attrs);        init(context, attrs);    }    private void init(Context context, AttributeSet attributeSet){        mPath = new Path();        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        mPaint.setStyle(Paint.Style.STROKE);    }    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        if(mBufferedCanvas != null){            mBufferedCanvas = null;        }        if(mBitmap != null){            mBitmap.recycle();        }        // 1. 创建宽高指定的Bitmap        mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.RGB_565);        // 2. 绘制缓冲区        mBufferedCanvas = new Canvas(mBitmap);    }    /**     * 控件自身通过 Canvas 参数,显示在屏幕上     * @param canvas     */    @Override    protected void onDraw(Canvas canvas) {        mBufferedCanvas.drawColor(Color.WHITE);        // 双缓冲技术        // 1. 绘制图片        mBufferedCanvas.drawPath(mPath, mPaint);        // 2. 绘制屏幕        canvas.drawBitmap(mBitmap, 0, 0, mPaint);//        canvas.drawPath(mPath, mPaint);    }    public void saveFile(String path){        if (mBitmap != null && path != null) {            File file = new File(path);            if(!file.exists()){                try {                    file.createNewFile();                } catch (IOException e) {                    e.printStackTrace();                }            }            try {                FileOutputStream fout = new FileOutputStream(file);                mBitmap.compress(Bitmap.CompressFormat.JPEG, 30, fout);                fout.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }    @Override    public boolean onTouchEvent(MotionEvent event) {        int action = event.getAction();        // 凡是在控件内部的各种事件操作,直接使用相对坐标        float ex = event.getX();        float ey = event.getY();        switch (action){            case MotionEvent.ACTION_DOWN:                mPath.moveTo(ex, ey); // 指定当前新的线段的起始位置                break;            case MotionEvent.ACTION_MOVE:                mPath.lineTo(ex, ey); // 当前线段的点与指定的点之间连接一条很小的线段                break;            case MotionEvent.ACTION_UP:                break;        }        // 刷新当前控件,让Android系统自动显示内容 调用 onDraw方法        invalidate();        return true;    }}
0 0