Android implements left-sliding exit activity (perfect encapsulation)

In Android apps, there are many ways to exit an activity, such as setting a return navigation key at the top and clicking on the return key to exit. Of course, perhaps now also noticed that many of the app has adopted a left-sliding exit, such as the micro-letter Chat interface exit, etc., are used to the left-sliding exit.

With the love of technology, I have recently studied this feature. Now let's talk about my thinking:

We all know that Android is a lot of time using the architecture of MVC, the separation of data from view: So is my idea. In the sliding exit, we generally feel that this is the logic inside the Java code, in fact, I know that an interface, there must be their own view, so my first step is also starting from view.

Step One: Define a parent container of your own, and let it inherit from a layout (LinearLayout, relativelayout can),

With the code below:

/**
* Custom can slide the relativelayout, similar to the slide removal page effect of iOS, when we want to use
* This feature requires that the top-level layout of the activity be set to Sildingfinishlayout,
* Then you need to call the Settouchview () method to set the view that you want to slide
*
* @author xiaanming
*
* @blog http://blog.csdn.net/xiaanming
*
*/
public class Sildingfinishlayout extends LinearLayout implements
Ontouchlistener {
/**
* Sildingfinishlayout layout of the parent layout
*/
Private ViewGroup Mparentview;
/**
* View that handles sliding logic
*/
Private View Touchview;
/**
* Minimum distance of slide
*/
private int mtouchslop;
/**
* Press the X coordinate of the point
*/
private int downx;
/**
* Press the y-coordinate of the point
*/
private int DownY;
/**
* Temporary storage of x coordinates
*/
private int tempx;
/**
* Sliding class
*/
Private Scroller Mscroller;
/**
* Width of Sildingfinishlayout
*/
private int viewwidth;
/**
* Whether the record is slipping
*/
Private Boolean issilding;




Private Onsildingfinishlistener Onsildingfinishlistener;
Private Boolean isfinish;




Public Sildingfinishlayout (context context, AttributeSet Attrs) {
This is (context, attrs, 0);
}




Public Sildingfinishlayout (context context, AttributeSet attrs, int defstyle) {
Super (context, attrs, Defstyle);




Mtouchslop = Viewconfiguration.get (context). Getscaledtouchslop ();
Mscroller = new Scroller (context);
}




@Override
protected void OnLayout (Boolean changed, int l, int t, int r, int b) {
Super.onlayout (changed, L, T, R, b);
if (changed) {
Gets the parent layout of the layout where Sildingfinishlayout resides
Mparentview = (viewgroup) this.getparent ();
Viewwidth = This.getwidth ();
}
}




/**
* Set Onsildingfinishlistener, Finish activity in Onsildingfinish () method
*
* @param onsildingfinishlistener
*/
public void Setonsildingfinishlistener (
Onsildingfinishlistener Onsildingfinishlistener) {
This.onsildingfinishlistener = Onsildingfinishlistener;
}




/**
* Set the Touch view
*
* @param Touchview
*/
public void Settouchview (View touchview) {
This.touchview = Touchview;
Touchview.setontouchlistener (this);
}




Public View Gettouchview () {
return touchview;
}




/**
* Rolling out the interface
*/
private void Scrollright () {
Final int delta = (viewwidth + MPARENTVIEW.GETSCROLLX ());
Call the Startscroll method to set some scrolling parameters, we call Scrollto in the Computescroll () method to scroll the item
Mscroller.startscroll (MPARENTVIEW.GETSCROLLX (), 0,-delta + 1, 0,
Math.Abs (delta));
Postinvalidate ();
}




/**
* Scroll to start position
*/
private void Scrollorigin () {
int delta = MPARENTVIEW.GETSCROLLX ();
Mscroller.startscroll (MPARENTVIEW.GETSCROLLX (), 0,-delta, 0,
Math.Abs (delta));
Postinvalidate ();
}




/**
* Touch view is Abslistview, such as the ListView, GridView and other subclasses
*
* @return
*/
Private Boolean Istouchonabslistview () {
Return Touchview instanceof Abslistview? True:false;
}




/**
* Touch view is ScrollView or its subclass
*
* @return
*/
Private Boolean Istouchonscrollview () {
Return Touchview instanceof ScrollView? True:false;
}




@Override
public boolean Ontouch (View V, motionevent event) {
Switch (event.getaction ()) {
Case Motionevent.action_down:
Downx = TEMPX = (int) event.getrawx ();
DownY = (int) Event.getrawy ();
Break
Case Motionevent.action_move:
int moveX = (int) event.getrawx ();
int deltax = Tempx-movex;
TEMPX = MoveX;
if (Math.Abs (MOVEX-DOWNX) > Mtouchslop
&& math.abs ((int) Event.getrawy ()-DownY) < Mtouchslop) {
Issilding = true;




If Touchview is Abslistview,
Then when the finger slides, cancel the item click event, or we slide along with the item click event to occur
if (Istouchonabslistview ()) {
Motionevent CancelEvent = Motionevent.obtain (event);
CancelEvent
. Setaction (Motionevent.action_cancel
| (Event.getactionindex () << motionevent.action_pointer_index_shift));
V.ontouchevent (CancelEvent);
}




}




if (movex-downx >= 0 && issilding) {
Mparentview.scrollby (deltax, 0);




Shielding in the course of the slide ListView ScrollView and other sliding events
if (Istouchonscrollview () | | Istouchonabslistview ()) {
return true;
}
}
Break
Case MOTIONEVENT.ACTION_UP:
Issilding = false;
if (MPARENTVIEW.GETSCROLLX () <=-viewwidth/2) {
Isfinish = true;
Scrollright ();
} else {
Scrollorigin ();
Isfinish = false;
}
Break
}




If the touch view is Abslistview or scrollview we're done with our own logic,
and give it to Abslistview, ScrollView himself to deal with his own logic.
if (Istouchonscrollview () | | Istouchonabslistview ()) {
Return V.ontouchevent (event);
}




The other case returns true directly
return true;
}




@Override
public void Computescroll () {
Scroller.computescrolloffset () returns True when Startscroll is invoked,
if (Mscroller.computescrolloffset ()) {
Mparentview.scrollto (Mscroller.getcurrx (), Mscroller.getcurry ());
Postinvalidate ();




if (mscroller.isfinished ()) {




if (Onsildingfinishlistener!= null && isfinish) {
Onsildingfinishlistener.onsildingfinish ();
}
}
}
}




Public interface Onsildingfinishlistener {
public void Onsildingfinish ();
}




}

Now your own parent container has been, how to use it?

Open our layout layout file, reference the parent container at the outermost level, and add the ID;

In the OnCreate () method of activity

Sildingfinishlayout msildingfinishlayout = (sildingfinishlayout) Findviewbyid (r.id.timed_task_sildingfinishlayout) ;

Msildingfinishlayout

. Setonsildingfinishlistener (New Onsildingfinishlistener () {





@Override

public void Onsildingfinish () {

TimedTaskActivity.this.finish ();

}

});

Msildingfinishlayout.settouchview (Mlistview);//Bind a control, here I use the layout inside the definition listview,

By now, this feature has been implemented

More details can be referred to blog http://blog.csdn.net/xiaanming