Issue
The latest Facebook's android app has a very nice floating comment window. There the user can dismiss the window swiping up or down making it really ease to use.
I want to implement a similar behaviour in my app but I don't know how to do it. Any idea or clue about how to do it will be really appreciated.
Screenshots of the Facebook app
(sorry, the Facebook app from where I took the screenshots is in Japanese)
Solution
I write some code that match this closing/resizing behaviour, I don't know if it's the way to go but my code is based on Activity class. First thing I do is create an activity and give it Transluscent
theme to get an activity with transparent background.
In my manifest.xml :
<activity
android:name=".PopupActivity"
android:label="@string/title_activity_popup"
<!-- Use Translucent theme to get transparent activity background
and NoTitleBar to avoid super old style title bar ;) -->
android:theme="@android:style/Theme.Translucent.NoTitleBar">
</activity>
Then I create a simple layout file containing a textview (corresponding to Facebook tchatting part) and a view (corresponding to Facebook "Write your msg"/"send smiley" tab)
my layout/activity_popup.xml :
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/base_popup_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="8dp"
android:background="@android:color/darker_gray"
android:layout_marginBottom="124dp">
<TextView
android:text="@string/hello_world"
android:layout_width="match_parent"
android:layout_height="200dp"
android:background="@android:color/black"/>
<View
android:layout_width="match_parent"
android:layout_height="80dp"
android:layout_alignParentBottom="true"
android:background="@android:color/holo_blue_dark"/>
</RelativeLayout>
Finally I handle touch and move event in my PopupActivity class, I use onTouchListener which provide callback in onTouch method.
PopupActivity
public class PopupActivity extends Activity implements View.OnTouchListener{
private RelativeLayout baseLayout;
private int previousFingerPosition = 0;
private int baseLayoutPosition = 0;
private int defaultViewHeight;
private boolean isClosing = false;
private boolean isScrollingUp = false;
private boolean isScrollingDown = false;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_popup);
baseLayout = (RelativeLayout) findViewById(R.id.base_popup_layout);
baseLayout.setOnTouchListener(this);
}
public boolean onTouch(View view, MotionEvent event) {
// Get finger position on screen
final int Y = (int) event.getRawY();
// Switch on motion event type
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
// save default base layout height
defaultViewHeight = baseLayout.getHeight();
// Init finger and view position
previousFingerPosition = Y;
baseLayoutPosition = (int) baseLayout.getY();
break;
case MotionEvent.ACTION_UP:
// If user was doing a scroll up
if(isScrollingUp){
// Reset baselayout position
baseLayout.setY(0);
// We are not in scrolling up mode anymore
isScrollingUp = false;
}
// If user was doing a scroll down
if(isScrollingDown){
// Reset baselayout position
baseLayout.setY(0);
// Reset base layout size
baseLayout.getLayoutParams().height = defaultViewHeight;
baseLayout.requestLayout();
// We are not in scrolling down mode anymore
isScrollingDown = false;
}
break;
case MotionEvent.ACTION_MOVE:
if(!isClosing){
int currentYPosition = (int) baseLayout.getY();
// If we scroll up
if(previousFingerPosition >Y){
// First time android rise an event for "up" move
if(!isScrollingUp){
isScrollingUp = true;
}
// Has user scroll down before -> view is smaller than it's default size -> resize it instead of change it position
if(baseLayout.getHeight()<defaultViewHeight){
baseLayout.getLayoutParams().height = baseLayout.getHeight() - (Y - previousFingerPosition);
baseLayout.requestLayout();
}
else {
// Has user scroll enough to "auto close" popup ?
if ((baseLayoutPosition - currentYPosition) > defaultViewHeight / 4) {
closeUpAndDismissDialog(currentYPosition);
return true;
}
//
}
baseLayout.setY(baseLayout.getY() + (Y - previousFingerPosition));
}
// If we scroll down
else{
// First time android rise an event for "down" move
if(!isScrollingDown){
isScrollingDown = true;
}
// Has user scroll enough to "auto close" popup ?
if (Math.abs(baseLayoutPosition - currentYPosition) > defaultViewHeight / 2)
{
closeDownAndDismissDialog(currentYPosition);
return true;
}
// Change base layout size and position (must change position because view anchor is top left corner)
baseLayout.setY(baseLayout.getY() + (Y - previousFingerPosition));
baseLayout.getLayoutParams().height = baseLayout.getHeight() - (Y - previousFingerPosition);
baseLayout.requestLayout();
}
// Update position
previousFingerPosition = Y;
}
break;
}
return true;
}
}
There are two small methods called when user has scroll enough to close popup (ie animate and finish activity) :
public void closeUpAndDismissDialog(int currentPosition){
isClosing = true;
ObjectAnimator positionAnimator = ObjectAnimator.ofFloat(baseLayout, "y", currentPosition, -baseLayout.getHeight());
positionAnimator.setDuration(300);
positionAnimator.addListener(new Animator.AnimatorListener()
{
. . .
@Override
public void onAnimationEnd(Animator animator)
{
finish();
}
. . .
});
positionAnimator.start();
}
public void closeDownAndDismissDialog(int currentPosition){
isClosing = true;
Display display = getWindowManager().getDefaultDisplay();
Point size = new Point();
display.getSize(size);
int screenHeight = size.y;
ObjectAnimator positionAnimator = ObjectAnimator.ofFloat(baseLayout, "y", currentPosition, screenHeight+baseLayout.getHeight());
positionAnimator.setDuration(300);
positionAnimator.addListener(new Animator.AnimatorListener()
{
. . .
@Override
public void onAnimationEnd(Animator animator)
{
finish();
}
. . .
});
positionAnimator.start();
}
With all this code your should be able to start PopupActivity that globally match Facebook popup behaviour. It's just a draft class and a lot of work remains to do : add animations, work on closing parameters and so on...
Screenshots :
Answered By - Gaëtan Maisse
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