涂鸦

package com.bluedatax.w65.chart;

import android.content.Context;
import android.graphics.Bitmap;
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.SurfaceHolder;
import android.view.SurfaceView;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by bdx108 on 15/12/10.
 */
public class SignView extends SurfaceView implements SurfaceHolder.Callback{
    private SurfaceHolder mSurfaceHolder = null;
    private Paint mPaint;
    //当前所选画笔的形状
    private MyPath myPath = null;
    //记录画笔的列表
    private List myPaths;
    //默认画笔为黑色
    private int currentColor = Color.BLACK;
    //画笔的粗细
    private int currentSize = 5;
    private Bitmap bmp;
    public SignView(Context context) {
        super(context);
        init();
    }

    public SignView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        Canvas canvas = mSurfaceHolder.lockCanvas();
        canvas.drawColor(Color.WHITE);
        mSurfaceHolder.unlockCanvasAndPost(canvas);
        myPaths = new ArrayList();
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {

    }
    private void init() {
        mSurfaceHolder = this.getHolder();
        mSurfaceHolder.addCallback(this);
        this.setFocusable(true);

        mPaint = new Paint();
        mPaint.setColor(Color.WHITE);
        mPaint.setStrokeWidth(6);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int action = event.getAction();
        if (action == MotionEvent.ACTION_CANCEL) {
            return false;
        }

        float touchX = event.getRawX();
        float touchY = event.getRawY();

        switch (action) {
            case MotionEvent.ACTION_DOWN:
                setCurAction(touchX, touchY);
                break;
            case MotionEvent.ACTION_MOVE:
                Canvas canvas = mSurfaceHolder.lockCanvas();
                canvas.drawColor(Color.WHITE);
                for (MyPath a : myPaths) {
                    a.draw(canvas);
                }
                myPath.move(touchX, touchY);
                myPath.draw(canvas);
                mSurfaceHolder.unlockCanvasAndPost(canvas);
                break;
            case MotionEvent.ACTION_UP:
                myPaths.add(myPath);
                myPath = null;
                break;

            default:
                break;
        }
        return super.onTouchEvent(event);
    }
    // 得到当前画笔的类型，并进行实例
    public void setCurAction(float x, float y) {
        myPath = new MyPath(x, y, currentSize, currentColor);
    }
    public boolean back(){
        myPaths.clear();
        Canvas canvas = mSurfaceHolder.lockCanvas();
        canvas.drawColor(Color.WHITE);
        mSurfaceHolder.unlockCanvasAndPost(canvas);
        return true;
    }
    /**
     * 获取画布的截图
     * @return
     */
    public Bitmap getBitmap() {
        bmp = Bitmap.createBitmap(getWidth(), getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bmp);
        draw(canvas);
        return bmp;
    }
//    public void doDraw(Canvas canvas) {
//        canvas.drawColor(Color.TRANSPARENT);
//        for (Action a : mActions) {
//            a.draw(canvas);
//        }
//        canvas.drawBitmap(bmp, 0, 0, mPaint);
//    }

    @Override
    public void draw(Canvas canvas) {
        super.draw(canvas);
        canvas.drawColor(Color.TRANSPARENT);
        for (MyPath a : myPaths) {
            a.draw(canvas);
        }
        canvas.drawBitmap(bmp, 0, 0, mPaint);
    }
}
// 自由曲线
class MyPath {
    Path path;
    int size;
    Paint paint;

//    MyPath() {
//        path = new Path();
//
//        size = 1;
//    }

    MyPath(float x, float y, int size, int color) {
        path = new Path();
        paint = new Paint();
        paint.setAntiAlias(true);
        paint.setDither(true);
        paint.setColor(Color.BLACK);
        paint.setStrokeWidth(size);
        paint.setStyle(Paint.Style.STROKE);
        paint.setStrokeJoin(Paint.Join.ROUND);
        paint.setStrokeCap(Paint.Cap.ROUND);
        this.size = size;
        path.moveTo(x, y);
        path.lineTo(x, y);
    }

    public void draw(Canvas canvas) {
        canvas.drawPath(path, paint);
    }

    public void move(float mx, float my) {
        path.lineTo(mx, my);
    }
}

package com.bluedatax.w65.utils.sign;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import com.bluedatax.w65.BaseActivity;
import com.bluedatax.w65.R;
import com.bluedatax.w65.chart.SignView;

/**
 * Created by bdx108 on 15/12/11.
 */



public class Sign extends BaseActivity implements View.OnClickListener{

    private SignView mMyView;
    private Button mButtonClear;
    private Button mButtonSave;
    private ImageView mImageView;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sign);
        mMyView= (SignView) findViewById(R.id.myview);
        mButtonClear= (Button) findViewById(R.id.clear);
        mButtonClear.setOnClickListener(this);
        mButtonSave= (Button) findViewById(R.id.save);
        mButtonSave.setOnClickListener(this);
        mImageView= (ImageView) findViewById(R.id.image_sign);
        String path=Environment.getExternalStorageDirectory()+ "/w65/sign/"+ "sign.png";
        if (path!=null){
            mImageView.setImageBitmap(getDiskBitmap(path));
            Toast.makeText(getApplicationContext(),path,Toast.LENGTH_LONG).show();
        }else {
            Toast.makeText(getApplicationContext(),"zanshi没有照片",Toast.LENGTH_LONG).show();
        }
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        return mMyView.onTouchEvent(event);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.clear:
                mMyView.back();
                break;
            case R.id.save:
                saveSign();
                mImageView.setImageBitmap(mMyView.getBitmap());
                break;
            default:
                break;
        }
    }

    private File saveSign() {
        String path = Environment.getExternalStorageDirectory().toString()+ "/w65/sign/";
        if (!new File(path).exists()) {
            new File(path).mkdirs();
        }
        File signFile=new File(path+"sign.png");
//        try {//另一种写法
//            saveBitmapToJPG(mMyView.getBitmap(),signFile);
//        } catch (IOException e) {
//            e.printStackTrace();
//        }
//        Intent mediaScanIntent=new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
//        Uri contentUri=Uri.fromFile(signFile);
//        mediaScanIntent.setData(contentUri);
//        this.sendBroadcast(mediaScanIntent);
        try {

            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(signFile));
            mMyView.getBitmap().compress(Bitmap.CompressFormat.PNG, 80, bos);
            bos.flush();
            bos.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        Toast.makeText(this, "图片保存成功，路径为" + path, Toast.LENGTH_LONG).show();
        Log.d("12345678",path.toString());
        return signFile;
    }
    public void saveBitmapToJPG(Bitmap bitmap, File photo) throws IOException {
        Bitmap newBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(newBitmap);
        canvas.drawColor(Color.WHITE);
        canvas.drawBitmap(bitmap, 0, 0, null);
        OutputStream stream = new FileOutputStream(photo);
        newBitmap.compress(Bitmap.CompressFormat.JPEG, 80, stream);
        stream.close();
    }
    private Bitmap getDiskBitmap(String pathString)
    {
        Bitmap bitmap = null;
        try
        {
            File file = new File(pathString);
            if(file.exists())
            {
                bitmap = BitmapFactory.decodeFile(pathString);
            }
        } catch (Exception e)
        {
            // TODO: handle exception
        }
        return bitmap;
    }
}