android将3位图保存为1

我有一个拍照的应用程序。 它创建了2个子集位图，使用失真处理这些位图，然后将子集放在原始位置作为叠加层。 有没有办法将所有三个位图保存为一个（如手机屏幕上显示的那样）？ 我想将用户在屏幕上看到的内容保存为SD卡上的第四个位图？ 我有一种感觉，我做错了。

谢谢

[UPDATE1]

@Override public void onDraw(Canvas canvas){ super.onDraw(canvas); Log.e(TAG, "******about to draw bgr "); canvas.drawBitmap(bgr, 0, 0, null); if (isLocked == true && bothCirclesInPlace == true){ if(overLay != null) canvas.drawBitmap(overLay, centreX-radius, centreY-radius, null); if(overLay2 != null) canvas.drawBitmap(overLay2, centreA-radius, centreB-radius, null); } 

Answer 1

是的，可以叠加多个位图并保存为单个图像文件（PNG / JPEG / ..）。

一种方法是使用Canvas类。 Canvas和Paint类定义了位图的重叠方式。

下面的代码将演示多个位图叠加到单个图像文件中。

 try { // String mFilePath : Absolute Path of the file to be saved // Bitmap mBitmap1 : First bitmap. This goes as background. // Bitmap mCBitmap : Bitmap associated with the Canvas. All draws on the canvas are drawn into this bitmap. // Bitmap mBitmap2 : Second bitmap. This goes on top of first (in this example serves as foreground. // Paint mPaint1 : Paint to draw first bitmap // Paint mPaint2 : Paint to draw second bitmap on top of first bitmap Bitmap mCBitmap = Bitmap.createBitmap(mBitmap1.getWidth(), mBitmap1.getHeight(), mBitmap1.getConfig()); Canvas tCanvas = new Canvas(mCBitmap); tCanvas.drawBitmap(mBitmap1, 0, 0, mPaint1); mPaint2.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DARKEN)); // XFer modes define the overlay characteristic tCanvas.drawBitmap(mBitmap2, 0, 0, mPaint2); FileOutputStream stream = new FileOutputStream(mFilePath); mCBitmap.compress(CompressFormat.JPEG, 100, stream); stream.flush(); stream.close(); } catch(Exception e) { Log.e("Could not save", e.toString()); } 

词shash

Answer 2

您可以尝试以下方法。 如果可以，将图像绘制到canvas：

 Bitmap bitmap = new Bitmap(// Set the params you like //); Canvas canvas = new Canvas(bitmap); canvas.drawBitmap(// The first picture //); canvas.drawBitmap(// First overlay //); canvas.drawBitmap(// Second overlay //); // You can draw whatever you like // For example: canvas.drawRectangle(...); // Now the bitmap can will hold everything you draw on the canvas. // You can save the bitmap to the SD bitmap.compress(...); 

Answer 3

您可以将Bitma.compress（..）与FileOutputStream一起用作最后一个参数。

有关如何写入SD卡的说明，请阅读有关外部存储的信息。