Android小应用-----画画板

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public class MainActivity extends Activity {private ImageView iv;float startX = 0;float startY = 0;//获得一个可以被bitmapBitmap bitmap = Bitmap.createBitmap(400, 400,Bitmap.Config.ARGB_8888);//创建画布Canvas canvas = new Canvas(bitmap);//创建画笔Paint paint = new Paint();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);iv = (ImageView) this.findViewById(R.id.iv);paint.setColor(Color.BLACK);paint.setStrokeWidth(1);//设置像素iv.setOnTouchListener(new OnTouchListener() {@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN:startX = event.getX();startY = event.getY();break;case MotionEvent.ACTION_MOVE:float newX = event.getX();float newY = event.getY();canvas.drawLine(startX, startY, newX, newY, paint);iv.setImageBitmap(bitmap);break;case MotionEvent.ACTION_UP:break;default:break;}return true;}});}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}}

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