定义PaintBoard2作为Activity的成员，并在onCreate初始化：

private PaintBoard2 paintBoard2; (Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); paintBoard2 = (PaintBoard2)findViewById(R.id.paint_board2); }

点击保存按钮的处理：

public void OnSaveClicked(View view) { try { File file = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis() + ".jpg"); OutputStream stream = new FileOutputStream(file); paintBoard2.saveBitmap(stream); stream.close(); // send broadcast to Media to update data Intent intent = new Intent(); intent.setAction(Intent.ACTION_MEDIA_MOUNTED); intent.setData(Uri.fromFile(Environment .getExternalStorageDirectory())); sendBroadcast(intent); Toast.makeText(this, "save success", Toast.LENGTH_SHORT).show(); } catch (Exception e) { Toast.makeText(this, "save failed", Toast.LENGTH_SHORT).show(); e.printStackTrace(); }

截图风采：

完成源码参考我的开源demo项目：

参考：