Implementation of Android: "Lottery wheel" and android Wheel

Implementation of Android: "Lottery wheel" and android Wheel

This example can help us learn the rotation animation and timer knowledge points, not to mention nonsense, on the main program:

Package com. bear. lotterywheel; import java. util. timer; import java. util. timerTask; import android. app. activity; import android. OS. bundle; import android. OS. handler; import android. view. menu; import android. view. view; import android. view. view. onClickListener; import android. view. animation. animation. animationListener; import android. view. animation. animation; import android. view. animation. rotateAnimation; import android. widget. imageView; import android. widget. toast; public class MainActivity extends Activity {// sets a time constant. This constant has two functions: 1. switch time between the circle light view and hide; 2. the time required for turning the pointer to a circle is now set to 500 ms private static final long ONE_WHEEL_TIME = 500; // record whether the boolean constant private boolean lightsOn = true displayed in the circular lamp view; // The angle when the rotation starts. The initial value is 0 private int startDegree = 0; private ImageView lightIv; private ImageView pointIv; private ImageView wheelIv; // data source private int [] laps = {5, 7, 10, 15}; // The angle data source pointed to by the pointer, because there are 6 options, all the values here are 6 private int [] angles = {0, 60,120,180,240,300}; // turntable content array private String [] lotteryStr = {"Sony PSP ", "10 yuan red packet", "Thank you for participating", "DNF wallet", "OPPO MP3", "5 yuan red packet ",}; // handler object private Handler mHandler = new Handler () {public void handleMessage (android. OS. message msg) {switch (msg. what) {case 0: if (lightsOn) {// set lightIv to be invisible. setVisibility (View. INVISIBLE); lightsOn = false;} else {// set lightIv to visible lightIv. setVisibility (View. VISIBLE); lightsOn = true;} break; default: break ;};}; // listener for animation status private AnimationListener al = new AnimationListener () {@ Overridepublic void onAnimationStart (Animation animation) {// TODO Auto-generated method stub} @ Overridepublic void onAnimationRepeat (Animation animation) {// TODO Auto-generated method stub} @ Overridepublic void onAnimationEnd (Animation animation) {String name = lotteryStr [startDegree % 360/60]; Toast. makeText (MainActivity. this, name, Toast. LENGTH_LONG ). show () ;};@ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); setupViews (); flashLights (); pointIv. setOnClickListener (new OnClickListener () {@ Overridepublic void onClick (View v) {int lap = laps [(int) (Math. random () * 4)]; int angle = angles [(int) (Math. random () * 6)]; // increment int increaseDegree = lap * 360 + angle for each circle angle; // initialize the rotation animation, the following four parameters are used to set RotateAnimation rotateAnimation = new RotateAnimation (startDegree, startDegree + increaseDegree, RotateAnimation. RELATIVE_TO_SELF, 0.5f, RotateAnimation. RELATIVE_TO_SELF, 0.5f); // assign the final angle to startDegree as the initial angle of the next circle startDegree + = increaseDegree; // calculate the total animation playback time long time = (lap + angle/360) * ONE_WHEEL_TIME; // set the animation playback time rotateAnimation. setDuration (time); // sets rotateAnimation on the last frame after the animation is played. setFillAfter (true); // sets the acceleration behavior of the animation. It is to accelerate the animation first and then slow down rotateAnimation. setInterpolator (MainActivity. this, android. r. anim. accelerate_decelerate_interpolator); // sets the animation listener rotateAnimation. setAnimationListener (al); // start playing the animation pointIv. startAnimation (rotateAnimation) ;}});} private void setupViews () {lightIv = (ImageView) findViewById (R. id. light); pointIv = (ImageView) findViewById (R. id. point); wheelIv = (ImageView) findViewById (R. id. main_wheel);} // method for controlling the lamp circle animation private void flashLights () {Timer timer = new Timer (); TimerTask tt = new TimerTask () {@ Overridepublic void run () {// send the message mHandler to the UI thread. sendEmptyMessage (0) ;}}; // run the run method timer of the tt object in milliseconds every ONE_WHEEL_TIME. schedule (tt, 0, ONE_WHEEL_TIME) ;}@ Overridepublic boolean onCreateOptionsMenu (Menu menu) {// Inflate the menu; this adds items to the action bar if it is present. getMenuInflater (). inflate (R. menu. main, menu); return true ;}}

As follows:

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Lucky Draw for android