Android：Bitmap：如何在Android中保存带绿色背景的画布？

概述我正在使用Bitmap创建数字签名图像.在设备上存储签名时,只有签名存储在黑色背景中.我希望绿色背景与签名. 这是我的Bitmap代码 // Bitmap Viewpublic class MyView extends View implements OnClickListener{ public int height; public int width; 我正在使用Bitmap创建数字签名图像.在设备上存储签名时,只有签名存储在黑色背景中.我希望绿色背景与签名.

这是我的Bitmap代码

// Bitmap VIEwpublic class MyVIEw extends VIEw implements OnClickListener{    public int height;    public int wIDth;           private Bitmap  mBitmap;            private Path    mPath;    private Paint   mBitmapPaint;     public MyVIEw(Context c)     {        super(c);        mPath = new Path();        mBitmapPaint = new Paint(Paint.DITHER_FLAG);       }     @OverrIDe    protected voID onSizeChanged(int w,int h,int olDW,int oldh)     {        super.onSizeChanged(w,h,olDW,oldh);          WID = w;        Ht = h;         mBitmap = Bitmap.createBitmap(w,Bitmap.Config.ARGB_8888);                    mCanvas = new Canvas(mBitmap);           }    @OverrIDe    protected voID onDraw(final Canvas canvas)    {         canvas.drawcolor(0xFFFFFFFF);               canvas.drawBitmap(mBitmap,mBitmapPaint);        canvas.drawPath(mPath,mPaint);         // onclick Listner for SAVE button        savebutton.setonClickListener(new OnClickListener() {              public voID onClick(VIEw v) {                 //capture the image                  try {                                        saveAsJpg(mBitmap);                         startActivity(new Intent(Paint.this,SignatureActivity.class));                    finish();                } catch (IOException e) {                                       e.printstacktrace();                }             }          });                 }    private float mX,mY;    private static final float touch_TolERANCE = 4;     private voID touch_start(float x,float y)     {         mPath.reset();        mPath.moveto(x,y);        mX = x;        mY = y;        System.out.println("---- " +mX);    }    private voID touch_move(float x,float y)     {         float dx = Math.abs(x - mX);        float dy = Math.abs(y - mY);        if (dx >= touch_TolERANCE || dy >= touch_TolERANCE) {            mPath.quadTo(mX,mY,(x + mX)/2,(y + mY)/2);            mX = x;            mY = y;        }    }    private voID touch_up()     {         mPath.lineto(mX,mY);        // commit the path to our offscreen        mCanvas.drawPath(mPath,mPaint);        // kill this so we don't double draw        mPath.reset();    }    @OverrIDe    public boolean ontouchEvent(MotionEvent event)     {        float x = event.getX();        float y = event.getY();        switch (event.getAction()) {        case MotionEvent.ACTION_DOWN:            touch_start(x,y);            invalIDate();            break;        case MotionEvent.ACTION_MOVE:            touch_move(x,y);            invalIDate();            break;        case MotionEvent.ACTION_UP:            touch_up();            invalIDate();            break;        }        return true;    }

我可以在创建签名时看到绿色背景,但它保存在黑色背景上.请帮帮我,谢谢你

解决方法 @rahul你也可以在onDraw中使用它

canvas.drawcolor(color.GREEN);

请检查我的代码的更新

@OverrIDeprotected voID onSizeChanged(int w,int oldh) {    mBitmap = Bitmap.createBitmap(w,Bitmap.Config.ARGB_8888);                mCanvas = new Canvas(mBitmap);      mCanvas.drawcolor(color.GREEN);    super.onSizeChanged(w,oldh);}

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