Scroroller for Android (3) -- controls are moved across the screen (simple to use scroroller) and androidscroroller

Scroroller for Android (3) -- controls are moved across the screen (simple to use scroroller) and androidscroroller
MainActivity is as follows:

Package cc.cn; import android. OS. bundle; import android. view. view; import android. view. view. onClickListener; import android. widget. button; import android. app. activity;/*** Demo Description: * Scroller use example -- let the control Pan across the screen ** reference: * http://blog.csdn.net/c_weibin/article/details/7438323 * Thank you very much ** note: * 1 in the layout, set cc.cn. the width of the Listener Control is set to "fill_parent" * to facilitate observation of sliding effect */public class MainActivity extends Activity {private Button mButton; private LinearLayoutSubClass success; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. main); init ();} private void init () {mLinearLayoutSubClass = (LinearLayoutSubClass) findViewById (R. id. linearLayoutSubClass); mButton = (Button) findViewById (R. id. button); mButton. setOnClickListener (new OnClickListener () {@ Overridepublic void onClick (View view) {mLinearLayoutSubClass. beginScroll ();}});}}

LinearLayoutSubClass is as follows:

Package cc.cn; import android. content. context; import android. util. attributeSet; import android. widget. linearLayout; import android. widget. scroller;/*** API Note: ** 1 // first, the start position of the two parameters, the offset of the four scrolling parameters, and the duration of the fifth parameter * startScroll (int startX, int startY, int dx, int dy, int duration) ** 2 // during startScroll () method execution, the computescroloffset () * method will always return true during the duration time, however, after the animation is executed, false is returned. * computescroloffset () ** 3 when ontouch (), invalidate (), or postInvalidate () is executed, this method is called * computeScroll () **/public class LinearLayoutSubClass extends LinearLayout {private Scroller mScroller; private boolean flag = true; public LinearLayoutSubClass (Context context) {super (context);} public LinearLayoutSubClass (Context context Context, attributeSet attrs) {super (context, attrs); // you can also use this constructor to input an interpolator // mScroller = new Scroller (context, interpolator ); mScroller = new Scroller (context) ;}@ Overridepublic void computeScroll () {super. computeScroll (); if (mScroller. computescroloffset () {scrollTo (mScroller. getCurrX (), 0); // make it call computeScroll () again until the sliding ends, that is, it does not meet the if condition postInvalidate () ;}} public void beginScroll () {if (flag) {mScroller. startScroll (0, 0,-2500, 0, 2500); flag = false;} else {mscroroller. startScroll (0, 0, 0, 0, 1500); flag = true;} // call invalidate (); so that it calls computeScroll () invalidate ();}}

Main. xml is as follows:

<RelativeLayout xmlns: android = "http://schemas.android.com/apk/res/android" xmlns: tools = "http://schemas.android.com/tools" android: layout_width = "match_parent" android: layout_height = "match_parent"> <Button android: id = "@ + id/button" android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: layout_centerHorizontal = "true" android: text = "sliding after clicking"/> <cc.cn. linearLayoutSubClass android: id = "@ + id/linearLayoutSubClass" android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: layout_centerVertical = "true"> <TextView android: layout_width = "wrap_content" android: layout_height = "wrap_content" android: background = "# ff1100" android: text = "test Scroller"/> </cc.cn. linearLayoutSubClass> </RelativeLayout>

Scroroller problems for android

In the first image, do I call repaint when I flip the page to the left?