android实现简单的画画板实例代码 实现简单的画画板实例代码 画画板实现起来其实很简单，我们只需要利用android给我们提供的Canvas类来操作就可以实现简单的画画功能 直接看代码，注释都写清楚了 复制代码 代码如下: public class MainActivity extends Activity { private ImageView iv; private Bitmap baseBitmap; private Canvas canvas; private Paint paint; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); this.iv = (ImageView) this.findViewById(R.id.iv); // 创建一张空白图片 baseBitmap = Bitmap.createBitmap(480, 640, Bitmap.Config.ARGB_8888); // 创建一张画布 canvas = new Canvas(baseBitmap); // 画布背景为灰色 canvas.drawColor(Color.GRAY); // 创建画笔 paint = new Paint(); // 画笔颜色为红色 paint.setColor(Color.RED); // 宽度5个像素 paint.setStrokeWidth(5); // 先将灰色背景画上 canvas.drawBitmap(baseBitmap, new Matrix(), paint); iv.setImageBitmap(baseBitmap); iv.setOnTouchListener(new OnTouchListener() { int startX; int startY; @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: // 获取手按下时的坐标 startX = (int) event.getX(); startY = (int) event.getY(); break; case MotionEvent.ACTION_MOVE: // 获取手移动后的坐标 int stopX = (int) event.getX(); int stopY = (int) event.getY(); // 在开始和结束坐标间画一条线 canvas.drawLine(startX, startY, stopX, stopY, paint); // 实时更新开始坐标 startX = (int) event.getX(); startY = (int) event.getY(); iv.setImageBitmap(baseBitmap); break; } return true; } }); } public void save(View view) { try { File file = new File(Environment.getExternalStorageDirectory(), System.currentTimeMillis() + ".jpg"); 

OutputStream stream = new FileOutputStream(file); baseBitmap.compress(CompressFormat.JPEG, 100, stream); stream.close(); // 模拟一个广播，通知系统sdcard被挂载 Intent intent = new Intent(); intent.setAction(Intent.ACTION_MEDIA_MOUNTED); intent.setData(Uri.fromFile(Environment .getExternalStorageDirectory())); sendBroadcast(intent); Toast.makeText(this, "保存图片成功", 0).show(); } catch (Exception e) { Toast.makeText(this, "保存图片失败", 0).show(); e.printStackTrace(); } } } 简单的布局文件 复制代码 代码如下: 再来个权限 复制代码 代码如下: 上两张我画的高端大气上档次的图片。。。。