4.5 腾讯手机卫士小火箭发射效果

//设置动画效果:

<?xml version="1.0" encoding= "utf-8"?>

<animation-list xmlns:android="http://schemas.android.com/apk/res/android"

    android:oneshot="false">

    <item android:drawable ="@drawable/desktop_rocket_launch_1" android:duration="200" />

    <item android:drawable ="@drawable/desktop_rocket_launch_2" android:duration="200" />

</animation-list>

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public class MainActivity extends Activity {

      AnimationDrawable rocketAnimation;

      ImageView rocketImage;

      ImageView iv_bottom;

      ImageView iv_somke_top;

      

      //跟新ui

      Handler handler = new Handler(){

             public void handleMessage(android.os.Message msg) {

                   int height = msg. what;

                   int iv_height = rocketImage.getBottom() - rocketImage.getTop();   //得到imageview 的高度

                   rocketImage.layout( rocketImage.getLeft(), height, rocketImage.getRight(), height+iv_height );

                   if(msg. what ==0){

                        AlphaAnimation aa = new AlphaAnimation(1.0f, 0.0f);

                        aa.setFillAfter( true);

                        aa.setDuration(1000);

                         iv_somke_top.startAnimation(aa);

                         iv_bottom.setVisibility(View. INVISIBLE);

                  }

                   if(msg. what ==200){

                         iv_somke_top.setVisibility(View. VISIBLE);

                  }

            };

      };

      @Override

      protected void onCreate(Bundle savedInstanceState) {

             super.onCreate(savedInstanceState);

            setContentView(R.layout. activity_main);

             //找到关心的控件

             rocketImage = (ImageView) findViewById(R.id. iv_rocket); 

             rocketImage.setBackgroundResource(R.drawable. rocket);

             rocketAnimation = (AnimationDrawable) rocketImage.getBackground();

            

             iv_bottom = (ImageView) findViewById(R.id. iv_bottom);

             iv_somke_top = (ImageView) findViewById(R.id. iv_somke_top);

             //给imageView设置触摸事件

             rocketImage.setOnTouchListener( new OnTouchListener() {

                   int startX =0;

                   int startY = 0;

                   @Override

                   public boolean onTouch(View v, MotionEvent event) {

                         if (! rocketAnimation.isRunning()) {

                               rocketAnimation.start();

                        }

                         switch (event.getAction()) {

                         case MotionEvent. ACTION_DOWN:     //摸到时

                               startX = ( int) event.getRawX();

                               startY = ( int) event.getRawY();

                              

                               break;

                         case MotionEvent. ACTION_MOVE:      //移动时

                               int newX = ( int) event.getRawX();

                               int newY = ( int) event.getRawY();

                               int dx = newX - startX;

                               int dy = newY - startY;

                              

                               int l = rocketImage.getLeft();

                               int r = rocketImage.getRight();

                               int t = rocketImage.getTop();

                               int b = rocketImage.getBottom();

                              

                               int newl = l+ dx;

                               int newr = r+ dx;

                               int newt = t + dy;

                               int newb = b + dy;

                              

                               rocketImage.layout(newl, newt, newr, newb);    //确定 imageview的位置

                              

                               startX = ( int) event.getRawX();

                               startY = ( int) event.getRawY();

                              

                               break;

                         case MotionEvent. ACTION_UP:                  //离开时

                               int bottom = rocketImage.getBottom();

                               int left = rocketImage.getLeft();

                              

                               if( bottom > 400 && left>100){

                                    Toast. makeText(getApplicationContext(), "发射火箭", 0).show();

                                     iv_bottom .setVisibility(View.VISIBLE);

                                    AlphaAnimation aa = new AlphaAnimation(0.0f, 1.0f);

                                    aa.setDuration(1000);

                                     iv_bottom.startAnimation(aa);

                                    

                                    

                                     //动态定时更新 view对象的位置.

                                     new Thread(){

                                           public void run() {

                                                 for( int i =1 ;i<=8;i++){

                                                       try {

                                                            Thread. sleep(10);

                                                      } catch (InterruptedException e) {

                                                            e.printStackTrace();

                                                      }

                                                       int height = 50*i;

                                                       handler.sendEmptyMessage(400-height);

                                                }

                                          };

                                    }.start();

                              }

                               break;

                        }

                         return true;

                  }

            });

      }

}