The implementation method of the control of the Android programming _android

This example describes the implementation of the controls that the Android programming control can drag. Share to everyone for your reference, specific as follows:

What is the difference between clicking and touching?

Click: A set of movements of a set of fingers press the button finger to stay in the button for a while the finger left button

private static final String TAG = "dragviewactivity";
Private ImageView Iv_dv_view;
Private TextView Tv_drag_view;
private int startx;
private int starty;
Private Sharedpreferences sp;
    @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);
    Requestwindowfeature (Window.feature_no_title);
Setcontentview (R.layout.dragview);
drawable drawable = new colordrawable (color.transparent);
    GetWindow (). setbackgrounddrawable (drawable);
    Iv_dv_view = (ImageView) This.findviewbyid (R.id.iv_dv_view);
    Tv_drag_view = (TextView) This.findviewbyid (R.id.tv_drag_view);
    SP = this.getsharedpreferences ("config", context.mode_private);
  Iv_dv_view.setontouchlistener (this);
    } @Override protected void Onresume () {super.onresume ();
    int x = Sp.getint ("Lastx", 0);
int y = sp.getint ("Lasty", 0); Iv_dv_view.layout (Iv_dv_view.getleft () + x, iv_dv_view.gettop () + y,//Iv_dv_view.getright () + x, IV_DV_VIEW.G EtbottOm () + y);
    Iv_dv_view.invalidate ()//interface Layoutparams params = (layoutparams) iv_dv_view.getlayoutparams ();
    Params.leftmargin = x;
    Params.topmargin = y;
  Iv_dv_view.setlayoutparams (params);
    @Override public boolean Ontouch (View V, motionevent event) {switch (V.getid ()) {//If you drag the finger on the ImageView Case R.id.iv_dv_view://EVENT.GETRAWX ();  Get Finger First Contact screen in x direction of coordinate switch (event.getaction ()) {case motionevent.action_down://get finger first touch screen startx =
        (int) event.getrawx ();
        Starty = (int) Event.getrawy ();
      Break
        Case motionevent.action_move://finger on the screen move the corresponding event int x = (int) event.getrawx ();
        int y = (int) Event.getrawy (); if (Y < 400) {//Set TextView below the form tv_drag_view.layout (Tv_drag_view.getleft (), 420, t
        V_drag_view.getright (), 440);
    else {tv_drag_view.layout (Tv_drag_view.getleft (), Tv_drag_view.getright (), 80);    //Get the finger moving distance int dx = X-STARTX;
        int dy = Y-starty;
        Get the coordinates int l = iv_dv_view.getleft () of the ImageView apex of the first vertex;
        int r = iv_dv_view.getright ();
        int t = iv_dv_view.gettop ();
        int b = Iv_dv_view.getbottom ();
        Change the position of the ImageView in the form iv_dv_view.layout (l + dx, T + dy, r + dx, B + dy);
        Gets the moved position startx = (int) event.getrawx ();
        Starty = (int) Event.getrawy ();
      Break
        Case motionevent.action_up://finger left screen corresponding event log.i (TAG, "finger left screen");
        Record the last picture at the position of the form int lasty = Iv_dv_view.gettop ();
        int lastx = Iv_dv_view.getleft ();
        Editor Editor = Sp.edit ();
        Editor.putint ("Lasty", lasty);
        Editor.putint ("Lastx", LASTX);
        Editor.commit ();
      Break
    } break;

 Return true;//does not interrupt touch event returns}

The XML is as follows:

<?xml version= "1.0" encoding= "Utf-8"?> <relativelayout xmlns:android=
"http://schemas.android.com/apk" /res/android "
  android:layout_width=" match_parent "
  android:layout_height=" Match_parent "
  android: Background= "#cc000000"
 >
<imageview
   android:layout_width= "160dip"
   android:layout_height= "60dip"
   android:background= "@drawable/button_background_selected"
   android:id= "@+id/iv_dv_view"
  >
 <textview
   android:id= "@+id/tv_drag_view"
   android:layout_margintop= "80dip"
   android: Layout_width= "Fill_parent"
   android:layout_height= "20dip"
   android:text= "hold down the green bar to drag the location displayed by the attribution"
   />
</RelativeLayout>

Touch: Move your finger away from the screen with a finger on the screen

More interested readers of Android-related content can view this site: "Introduction to Android Development and advanced Course", "Android Communication Summary", "Android Basic Components Usage Summary", "Android View Summary", " Android Layout layout Tips and a summary of the use of Android controls

I hope this article will help you with the Android program.