Question

我有一个imageView，画布和一个按钮.. 当我单击按钮时，在画布上绘制位图

我想使用onTouch移动该位图（将位图拖动到画布上的任何位置）。

       s.setOnItemClickListener(new OnItemClickListener() {
           public void onItemClick(AdapterView<?> parent,
                   View v, int position, long id) {
            Bitmap workingBitmap = Bitmap.createBitmap(currentBitmap);
            workingBitmap = Bitmap.createBitmap(workingBitmap); 
            Canvas c = new Canvas(workingBitmap);
            brightBitmap = BitmapFactory.decodeResource(getResources(), sIds.mSmileyIds[position], null); 
            brightBitmap = Bitmap.createScaledBitmap(brightBitmap, 100, 100, false);
            chosenSmiley = brightBitmap;
                if (chosenSmiley != null) {
                    try {
                    c.drawBitmap(chosenSmiley, posX, posY, null);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
                iv.setImageBitmap(workingBitmap);
               }

        public boolean onTouchEvent(MotionEvent event) {
            int eventaction = event.getAction();

            switch (eventaction) {
                case MotionEvent.ACTION_DOWN: 
                    // finger touches the screen
                    break;

                case MotionEvent.ACTION_MOVE:
                    // finger moves on the screen
                    lastX = (int) event.getX();
                    lastY = (int) event.getY();
                    Log.e("my xname", lastX + " Coords of lastX");
                    Log.e("my xname", lastY + " Coords of lastY");
                    brightBitmap = Bitmap.createScaledBitmap(brightBitmap, lastX, lastY, false);
                    break;

                case MotionEvent.ACTION_UP:   
                    // finger leaves the screen
                    break;
            }

            // tell the system that we handled the event and no further processing is required
            return true; 
        }   

       });

这是我当前的代码，位图在0,0上创建，但我无法拖动它等等。

Answer 1

 public class MainActivity extends Activity
{
  @Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    DrawingView dv = new DrawingView(this);
    setContentView(dv);
}

class DrawingView extends View{
Bitmap bitmap;

float x,y;

public DrawingView(Context context)
{
 super(context);
 bitmap = BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_launcher);
}


public boolean onTouchEvent(MotionEvent event)
{

 switch(event.getAction())
    {
   case MotionEvent.ACTION_DOWN: {

   }
   break;

   case MotionEvent.ACTION_MOVE: 
   {
      x=(int)event.getX();
      y=(int)event.getY();

 invalidate();
 }

 break;
   case MotionEvent.ACTION_UP: 

       x=(int)event.getX();
       y=(int)event.getY();
       System.out.println(".................."+x+"......"+y); //x= 345 y=530 
       invalidate();
    break; 
   }
  return true;
 }

 @Override
 public void onDraw(Canvas canvas)
 {
 Paint paint = new Paint();
 paint.setStyle(Paint.Style.FILL);
 paint.setColor(Color.CYAN);
 canvas.drawBitmap(bitmap, x, y, paint);  //originally bitmap draw at x=o and y=0
 }
 }
 }

在星形位图处绘制x = 0和y = 0;在拖动x和y更改时，调用inavlidate刷新drate。在触摸时，在拖动位置x和y处绘制位图，并调用invalidate以刷新绘图。

在x = 0 y = 0处绘制的位图。拖放时// x = 345 y = 530。附加快照。

你需要确保你的图像看起来不像屏幕边缘的屏幕。检查x是否在screenwidth内 - bitmapwidth和y小于screenheight - bitmapheight。我没有在代码中包含这些条件。

enter image description here

编辑：

      setContentView(R.layout.main);    
      LinearLayout ll = (LinearLayout) findViewById(R.id.ll);
      DrawingView dv= new DrawingView(this);
      ll.addView(dv);

在画布上移动位图

1 个答案: