I would like to move two different views into my layout, so that an user can display it like his wishes.
So far I've made the following code to handle the touch event:
this.viewEvent.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event)
{
final int y = (int) event.getRawY();
RelativeLayout.LayoutParams params = (RelativeLayout.LayoutParams) view.getLayoutParams();
switch (event.getAction() & MotionEvent.ACTION_MASK)
{
case MotionEvent.ACTION_DOWN:
element.setEventY(y - params.topMargin);
break;
case MotionEvent.ACTION_UP:
viewGroup.invalidate();
break;
case MotionEvent.ACTION_POINTER_DOWN:
case MotionEvent.ACTION_POINTER_UP:
break;
case MotionEvent.ACTION_MOVE:
params.topMargin = y - element.getEventY();
params.bottomMargin = screenHeight - view.getHeight() - params.topMargin;
// Avoid out of screen
if (params.topMargin < 0) return true;
// Apply changes
view.setLayoutParams(params);
break;
}
return true;
}
});
element
is an instance of a custom object to handle the position.
screenHeight
is the screen height given by the Display
class.
I'm able to move the element but it's blinking when I touch it and once I put my finger up, the view just disapear. I can't even retrieve it, it's just out of the screen.
Did I make something wrong ?
Thanks for your help
USe the following code to perform a simple Touch to move
:
layout_counter.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event)
{
if (currentState != State.EDIT_MOVE) return false;
FrameLayout.LayoutParams params = (FrameLayout.LayoutParams) view.getLayoutParams();
if (view.getId() != R.id.layout_counter) return false;
switch (event.getAction())
{
case MotionEvent.ACTION_MOVE:
params.topMargin = (int) event.getRawY() - view.getHeight();
params.leftMargin = (int) event.getRawX() - (view.getWidth() / 2);
view.setLayoutParams(params);
break;
case MotionEvent.ACTION_UP:
params.topMargin = (int) event.getRawY() - view.getHeight();
params.leftMargin = (int) event.getRawX() - (view.getWidth() / 2);
view.setLayoutParams(params);
break;
case MotionEvent.ACTION_DOWN:
view.setLayoutParams(params);
break;
}
return true;
}
});
Where layout_counter
is the view you want to move.
Don't forget to put your movable elements into a FrameLayout
I created the library, which moves the view:
Just add the dependency:
dependencies {
compile 'com.scalified:viewmover:1.1.0'
}
More info you can find on GitHub
I will provide an alternative solution for those who use Relative layout for example.
import android.app.Activity;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.ImageView;
import android.widget.RelativeLayout;
public class MainActivity extends Activity implements View.OnTouchListener
{
private int _xDelta;
private int _yDelta;
private int _rightMargin;
private int _bottomMargin;
private ImageView _floatingView;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
this._floatingView = (ImageView) findViewById(R.id.textView);
this._floatingView.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener()
{
@Override
public boolean onPreDraw()
{
if (_floatingView.getViewTreeObserver().isAlive())
_floatingView.getViewTreeObserver().removeOnPreDrawListener(this);
updateLayoutParams(_floatingView);
return false;
}
});
this._floatingView.setOnTouchListener(this);
}
private void updateLayoutParams(View view)
{
this._rightMargin = -view.getMeasuredWidth();
this._bottomMargin = -view.getMeasuredHeight();
RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(view.getMeasuredWidth(), view.getMeasuredHeight());
layoutParams.bottomMargin = this._bottomMargin;
layoutParams.rightMargin = this._rightMargin;
view.setLayoutParams(layoutParams);
}
@Override
public boolean onTouch(View view, MotionEvent event)
{
if (view == this._floatingView)
{
final int X = (int) event.getRawX();
final int Y = (int) event.getRawY();
switch (event.getAction() & MotionEvent.ACTION_MASK)
{
case MotionEvent.ACTION_DOWN:
RelativeLayout.LayoutParams lParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
this._xDelta = X - lParams.leftMargin;
this._yDelta = Y - lParams.topMargin;
break;
case MotionEvent.ACTION_MOVE:
RelativeLayout.LayoutParams layoutParams = (RelativeLayout.LayoutParams) view.getLayoutParams();
layoutParams.leftMargin = X - this._xDelta;
layoutParams.topMargin = Y - this._yDelta;
layoutParams.rightMargin = this._rightMargin;
layoutParams.bottomMargin = this._bottomMargin;
view.setLayoutParams(layoutParams);
break;
}
return true;
}
else
{
return false;
}
}
}
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