I want move a bitmap in the screen, but i can do it only horizontally, because if I do it vertically, the scroll of the view start and the movement of the bitmap disappears. I have
public boolean onTouchEvent(MotionEvent event)
method where in case MOVE I change the X and Y of the bitmap. Then in onDraw() method I paint the bitmap. The scroll are in xml. Inside of it are a layout and inside a View.
I would like when I touch, in case DOWN, if I touch the bitmap, disable the scroll, but I is in other place no.
that is the resume of the code
public class Table extends ScrollView{
private static Integer srcX = 0, srcY = 0;
public Table(Context context) {
super(context);
setWillNotDraw(false);
setVerticalScrollBarEnabled(true);
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
for(int i=1; i<= Paint_Table.num_players; i++)
canvas.drawBitmap(bitmap, X, Y, null);
}
#SuppressLint("ClickableViewAccessibility") #Override
public boolean onTouchEvent(MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
if (youTouchBitmap) {
srcX = x;
srcY = y;
}
break;
case MotionEvent.ACTION_MOVE:
if (srcX !=0 && srcY != 0) {
X=x;
Y=y;
invalidate();
}
break;
}
return true;
}
}
Can someone help me?
Thanks and regards.
since i dont see code ive find some link might help you:
How to disable and enable the scrolling on android ScrollView?
in the link you can see in the answers a code that is custom scroll view its work on flag.
you can choose when the scroll will work ot not.
hope i helpd :)
Related
I am kind of new to the onDraw so i don't know how to go around this problem.
I want to draw a image at this location (just so i can try the rest myself). These locations are off the ontap and * the drawables width and height. This code is in a class that extends photoview.
The problem is this resource is not being displayed, i also tried to use on a drawcirlce example that also didnt display. I have also attached that below.
#Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Bitmap markerBitmap = BitmapFactory.decodeResource(activity.getResources(), R.drawable.markerformap);
canvas.drawBitmap(markerBitmap, 2000, 5000, new Paint());
}
Draw circle example
canvas.drawCircle(2000, 5000,300, new Paint());
The onTouch Listener
#Override
public boolean onTouch(View v, MotionEvent event) {
if(y != event.getY() && x != event.getX()){
x = event.getX();
y = event.getY();
return true;
}
return false;
}
I am trying to implement a drag and drop function in Android.I have choosed to implement it using motion event because I think it is easy to understand.I want to make that image I move to remain in the same position and move a duplication. I don't really know how to explain, I want an image on the corner and when I move it the image still remain there but I move another one that is the same, and If I want to move another one from the same position again I move another position.It's like I am trying to get 10 balls from a basket but in this case the basket and the balls are the same image.
My code so far is this:
public class MainActivity extends ActionBarActivity {
private View selected_item = null;
private int offset_x = 0;
private int offset_y = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ViewGroup vg = (ViewGroup)findViewById(R.id.container);
vg.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
switch(event.getActionMasked())
{
case MotionEvent.ACTION_MOVE:
int x = (int)event.getX() - offset_x;
int y = (int)event.getY() - offset_y;
int w = getWindowManager().getDefaultDisplay().getWidth() - 100;
int h = getWindowManager().getDefaultDisplay().getHeight() - 100;
if(x > w)
x = w;
if(y > h)
y = h;
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
new ViewGroup.MarginLayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
lp.setMargins(x, y, 0, 0);
selected_item.setLayoutParams(lp);
break;
default:
break;
}
return true;
}
});
ImageView img = (ImageView)findViewById(R.id.newwall);
img.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
switch(event.getActionMasked())
{
case MotionEvent.ACTION_DOWN:
offset_x = (int)event.getX();
offset_y = (int)event.getY();
selected_item = v;
break;
default:
break;
}
return false;
}
});
Also, I am using a ViewGroup and I have a touchListener attached on it.When I am pressing the Layout I am getting the image where I press, I would like when I drop the image to remain there if I touch somewhere else on the screen.I have tried to set selected_item back to null when I end the drag but I didn't make it good I guess because I was getting error and app crashes.
Please help me solve these 2 problems.
Here is what I have used for similar purpose
ImageView snapshot = (ImageView)findViewById(R.id.nonFullScreenSnapshot);
vg.buildDrawingCache();
cache = Bitmap.createBitmap(vg.getDrawingCache());
Drawable drawableShot = new BitmapDrawable(getResources(), cache);
snapshot.setImageDrawable(drawableShot);
snapshot.setVisibility(View.VISIBLE);
In this case I have an ImageView already available from my xml layout, which should be at least as big as the image you want to duplicate.
So when the user touches your ViewGroup you should make a duplicate of it and then position it on the new location.
But be careful with the number of duplicates, because you can easily run out of memory and you will get OutOfMemory exception.
I have drawn piechart using canvas method of view , but now i want get click of individual pie ? how can i dot that?
I got perfect answer for this question:
get color code of click area and check if color match with your color code this will get click you want.
#Override
public boolean onTouchEvent(MotionEvent event) {
float touchX = event.getX();
float touchY = event.getY();
Logger.debug("X-->"+touchX+" Y---->"+touchY);
//get drawing cache of your view
Bitmap bitmap = getDrawingCache(true);
//Get color code of pixle where you have tap
int colorCode=bitmap.getPixel((int)touchX,(int)touchY);
if(colorCode == context.getResources().getColor(R.color.pie_blue)) {
Logger.debug("Color blue");
onPieClick.onBluePieClick(touchX,touchY);
}else if(colorCode == context.getResources().getColor(R.color.pie_green)) {
Logger.debug("Color green");
onPieClick.onGreenPieClick(touchX,touchY);
}
return super.onTouchEvent(event);
}
What you can do is,
Override onTouch event & You will get Motion event,
You will get x & y co-ordinates of the click by event.getX() &
event.getY() respectively.
identify where this x & y intersect in pie.
Sample code:
1)Simple
public boolean onTouchEvent(MotionEvent event) {
if(event.getAction()==MotionEvent.ACTION_UP){
float xCord=event.getX();
float yCord = event.getY();
....
Write condition to identify where this x & y intersect in pie.
...
}
return true;
}
2) Another way getting touch (good way)
OnGestureListener mGestureListener=new GestureDetector.SimpleOnGestureListener(){
public boolean onSingleTapConfirmed(MotionEvent e) {
float xCord=e.getX();
float yCord = e.getY();
....
identify where this x & y intersect in pie.
...
};
};
GestureDetector gestureDetector=new GestureDetector(context, mGestureListener);
public boolean onTouchEvent(MotionEvent event) {
gestureDetector.onTouchEvent(event);
return true;
}
You can't. Well, at least not directly.
You could do the following though:
In the click handler for the view, determine the xy coordinates of the click
Compare the drawing code you wrote, thereby determining in which piece of the pie the click was
I am working on an online handwriting recognition tool . I have a custom view which i am adding to linear layout . how can i get the coordinates in custom view and transfer them to main activity file for storing them in linked lists or array lists
You need create a custom class that implements the OnTouchListener interface and set it to listen to touch events on your custom view. Its very similar to adding an OnClickListener to a button:
MyView view = (MyView) findViewById(R.id.myView);
view.setOnTouchListener(new MyOnTouchListener());
Where MyOnTouchListener looks something like this:
class MyOnTouchListener implement OnTouchListener{
public int x=-1,y=-1,prevX=-1, prevY=-1;
public boolean onTouch(View v, MotionEvent event)
{
prevX = x;
prevY = y;
int x = (int)event.getX();
int y = (int)event.getY();
switch(event.getAction()){
case MotionEvent.ACTION_DOWN:
// there is no prev touch
prevX = -1;
prevY = -1;
// touch down code
break;
case MotionEvent.ACTION_MOVE:
// touch move code
// add points to array here!
break;
case MotionEvent.ACTION_UP:
// touch up code
break;
}
return true;
}
}
You could override the method OnTouchEvent on your View.
public boolean onTouchEvent(MotionEvent event) {
float x=event.getX();
float y=event.getY();
}
And then if you want, you could construct a Array or a List.
ArrayList<Point> myList;
...
//Constructor
...
...
public boolean onTouchEvent(MotionEvent event) {
float x=event.getX();
float y=event.getY();
Point p =new Point();
p.set(x, y);
//And then add to the list
myList.add(p);
}
public ArrayList<Point> getMyArray(){
return myList;
}
And for call the method getMyArray of your custom view. You could use this code on your main activity
myView mv = (myView)this.findViewById(R.id.myView1);
ArrayList<Point> points = mv.getMyArray();
That's a possible solution for your problem but I don't know if it helps you.
Edit: This solution works for all customs View but, if I were you, I would use a View that extends SurfaceView. It's logical because , I think, it's the best way to create graphics in a handwriting tool.
Is there a way in android to get the area (a collection of points) of my finger when i touch the screen. Usually, the return is one point location. I need to get the several points which can represent the area of my touching. Any one knows? Thnaks
Just use View class's onTouchEvent() or implements OnTouchListener in your activity and get the X and Y co-ordinates like,
This is View class's OnTouchEvent()..
#Override
public boolean onTouchEvent(MotionEvent ev) {
final int action = ev.getAction();
switch (action & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN: {
float x = ev.getX();
float y = ev.getY();
break;
}
case MotionEvent.ACTION_MOVE: {
float mLastTouchX = x;
float mLastTouchY = y;
break;
}
case MotionEvent.ACTION_UP: {
break;
}
case MotionEvent.ACTION_CANCEL: {
break;
}
case MotionEvent.ACTION_POINTER_UP: {
break;
}
}
return true;
}
EDIT:
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final TextView textView = (TextView)findViewById(R.id.textView);
// this is the view on which you will listen for touch events
final View touchView = findViewById(R.id.touchView);
touchView.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
textView.setText("Touch coordinates : " +
String.valueOf(event.getX()) + "x" + String.valueOf(event.getY()));
return true;
}
});
}
For more details Android - View.
Does it have to be the real shape of the finger? Otherwise you could calculate a circle around the center of the touch.
I believe this is not possible in the touch's coordinate along with it's area. It's natively unsupported by Android API.
Ref:
http://developer.android.com/guide/topics/ui/ui-events.html
http://developer.android.com/reference/android/gesture/package-summary.html
Unfortunately not. I ran in to this a while ago - you could try normalising the data over several 'frames'. May be worth trying to figure out why you need an exact point, or set of points, and find another way of doing it.