Android custom View-slide Switch

MainActivity is as follows: <喎?http: www.bkjia.com kf ware vc " target="_blank" class="keylink"> VcD4KPHByZSBjbGFzcz0 = "brush: java;"> package cc. testview3; import cc. testview3.SwitchView. switchChangedListener; import android. OS. bundle; import android. widget. toast; import android. app. activity;/*** Demo Description: * Sliding switch for custom View ** Test Device: * Resolution: 480x854 */public class MainActivity extends Activity {private SwitchView mSwitchView; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (sav EdInstanceState); setContentView (R. layout. main); init ();} private void init () {mSwitchView = (SwitchView) findViewById (R. id. switchView); mSwitchView. initSwitchStatus (true); mSwitchView. setOnSwitchChangedListener (new SwitchChangedListenerImpl ();} private class SwitchChangedListenerImpl implements SwitchChangedListener {@ Overridepublic void OnChanged (boolean currentStatus) {Toast. makeText (MainActivity. This, "currentIsOff? --> "+ CurrentStatus, Toast. LENGTH_SHORT). show ();}}}

SwitchView:

Package cc. testview3; import android. content. context; import android. graphics. bitmap; import android. graphics. bitmapFactory; import android. graphics. canvas; import android. graphics. matrix; import android. graphics. paint; import android. util. attributeSet; import android. view. motionEvent; import android. view. view; public class SwitchView extends View {private Bitmap mOnBitmap; private Bitmap mOffBitmap; private B Itmap mDotBitmap; private float currentX; private boolean currentIsSlipping = false; private boolean currentIsOff; private SwitchChangedListener listener; private int dotWidth; private int switchWidth; public SwitchView (Context context, AttributeSet attrs, int defStyle) {super (context, attrs, defStyle); initSwitchView ();} public SwitchView (Context context, AttributeSet attrs) {super (context, Attrs); initSwitchView ();} public SwitchView (Context context) {super (context); initSwitchView ();} private void initSwitchView () {mOnBitmap = BitmapFactory. decodeResource (getResources (), R. drawable. on); mOffBitmap = BitmapFactory. decodeResource (getResources (), R. drawable. off); mDotBitmap = BitmapFactory. decodeResource (getResources (), R. drawable. dot); dotWidth = mDotBitmap. getWidth (); switchWidth = mOnBitmap. getWidth (); This. setOnTouchListener (new TouchListenerImpl ();} public void initSwitchStatus (boolean isOff) {if (isOff) {currentX = switchWidth;} else {currentX = 0;} currentIsOff = isOff ;} @ Overrideprotected void onMeasure (int widthMeasureSpec, int heightMeasureSpec) {super. onMeasure (widthMeasureSpec, heightMeasureSpec);} @ Overrideprotected void onLayout (boolean changed, int left, int top, int right, int bottom) {super. OnLayout (changed, left, top, right, bottom) ;}@ Overrideprotected void onDraw (Canvas canvas) {super. onDraw (canvas); Matrix matrix = new Matrix (); Paint paint = new Paint (); // first draws the background of the switch (Off/On) if (currentIsOff) {canvas. drawBitmap (mOffBitmap, matrix, paint);} else {canvas. drawBitmap (mOnBitmap, matrix, paint);} // draw the slider. // 1. Slide (if ), the left of the slider is the changing currentX // when the sliding stops after the 2 fingers are raised (else. at this time, the switch should be on or off on the left and right. // if (currentIsS Lipping) {canvas. drawBitmap (mDotBitmap, currentX, 17, paint);} else {if (currentIsOff) {canvas. drawBitmap (mDotBitmap, currentX-dotWidth, 17, paint);} else {canvas. drawBitmap (mDotBitmap, currentX, 17, paint) ;}} private class TouchListenerImpl implements OnTouchListener {@ Overridepublic boolean onTouch (View v, MotionEvent event) {switch (event. getAction () {case MotionEvent. ACTION_DOWN: break; case Mot IonEvent. ACTION_MOVE: currentIsSlipping = true; currentX = event. getX (); if (currentX> switchWidth/2) {currentIsOff = true;} else {currentIsOff = false;} // prevents cross-border if (event. getX ()> switchWidth-dotWidth) {currentX = switchWidth-dotWidth; currentIsOff = true;} // prevents cross-border if (event. getX () <0) {currentX = 0; currentIsOff = false;} // redraw !!! Invalidate (); break; case MotionEvent. ACTION_UP: currentIsSlipping = false; currentX = event. getX (); // if (if) has exceeded the normal length of the switch, the switch is in the off state. // otherwise (else) make it open. if (currentX> = switchWidth/2) {currentX = switchWidth; currentIsOff = true;} else {currentX = 0; currentIsOff = false;} if (mSwitchChangedListener! = Null) {mSwitchChangedListener. OnChanged (currentIsOff) ;}// redraw !!! Invalidate (); break; default: break;} return true ;}// interface public interface SwitchChangedListener {public void OnChanged (boolean currentIsOff);} public void setOnSwitchChangedListener (SwitchChangedListener switchChangedListener) {this. mSwitchChangedListener = switchChangedListener ;}}

Main. xml is as follows: