制作随手涂鸦
public class MainActivity extends Activity implements OnClickListener { private Paint paint; private Canvas canvas; private ImageView iv; private Bitmap bitmap; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); View black = findViewById(R.id.view_black); View bule = findViewById(R.id.view_bule); View gray = findViewById(R.id.view_gray); View green = findViewById(R.id.view_green); View indigo = findViewById(R.id.view_indigo); View orange = findViewById(R.id.view_orange); View purple = findViewById(R.id.view_purple); View red = findViewById(R.id.view_red); View yellow = findViewById(R.id.view_yellow); bule.setOnClickListener(this); black.setOnClickListener(this); gray.setOnClickListener(this); green.setOnClickListener(this); indigo.setOnClickListener(this); orange.setOnClickListener(this); purple.setOnClickListener(this); red.setOnClickListener(this); yellow.setOnClickListener(this); iv = (ImageView) findViewById(R.id.iv); SeekBar sb = (SeekBar) findViewById(R.id.sb); //创建图片副本 bitmap = Bitmap.createBitmap(500, 500, Bitmap.Config.ARGB_8888); //开始编辑 canvas = new Canvas(bitmap); canvas.drawColor(Color.WHITE); Matrix matrix = new Matrix(); paint = new Paint(); canvas.drawBitmap(bitmap, matrix, paint); iv.setImageBitmap(bitmap); sb.setOnSeekBarChangeListener(new OnSeekBarChangeListener() { @Override public void onStopTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub // 设置笔的大小 paint.setStrokeWidth(seekBar.getProgress()); } @Override public void onStartTrackingTouch(SeekBar seekBar) { // TODO Auto-generated method stub } @Override public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { // TODO Auto-generated method stub } }); iv.setOnTouchListener(new OnTouchListener() { float downX; float downY; float moveX; float moveY; @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub switch (event.getAction()) { case MotionEvent.ACTION_DOWN: downX = event.getX(); downY = event.getY(); break; case MotionEvent.ACTION_MOVE: moveX = event.getX(); moveY = event.getY(); //开始做画 canvas.drawLine(downX, downY, moveX, moveY, paint); iv.setImageBitmap(bitmap); downX = moveX; downY = moveY; break; case MotionEvent.ACTION_UP: break; default: break; } return true; } }); } @Override public void onClick(View v) { // 给画笔设置颜色 switch (v.getId()) { case R.id.view_black: paint.setColor(Color.BLACK); break; case R.id.view_bule: paint.setColor(Color.BLUE); break; case R.id.view_gray: paint.setColor(Color.GRAY); break; case R.id.view_green: paint.setColor(Color.GREEN); break; case R.id.view_indigo: paint.setColor(0xff00ffff); break; case R.id.view_orange: paint.setColor(0xffff9900); break; case R.id.view_purple: paint.setColor(0xffff00ff); break; case R.id.view_red: paint.setColor(Color.RED); break; case R.id.view_yellow: paint.setColor(Color.YELLOW); break; default: break; } } @Override public 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; } //菜单保存与清除 @Override public boolean onOptionsItemSelected(MenuItem item) { // TODO Auto-generated method stub File file = new File("/mnt/sdcard/" + System.currentTimeMillis() + ".jpg"); if (item.getItemId() == R.id.action_clear) { canvas.drawColor(Color.WHITE); iv.setImageBitmap(bitmap); } else { try { FileOutputStream stream = new FileOutputStream(file); bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream); //发送广播让系统重新刷新指定图片 Intent intent =new Intent(); intent.setAction(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE); Uri uri=Uri.fromFile(file); intent.setData(uri); sendBroadcast(intent); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return super.onOptionsItemSelected(item); } }
