拖拽升空的Android小火箭

先上演示效果

这里写图片描述

1、MainActivity

主布局就两个Button按钮：一开启、二关闭就不贴主布局xml了

因为小火箭是游离在activity之外的，所以不能依赖activity的生命周期

需要注意的一点是不要忘记在清单文件里配置 service

贴一下代码：

public class MainActivity extends Activity {private Button open,close;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);requestWindowFeature(Window.FEATURE_NO_TITLE);setContentView(R.layout.activity_main);initView();}/*** 初始化*/private void initView() {// TODO Auto-generated method stubopen = (Button) findViewById(R.id.open);close = (Button) findViewById(R.id.close);/*** 开启火箭*/open.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubstartService(new Intent(MainActivity.this,RocketService.class));finish();}});/*** 关闭火箭*/close.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {// TODO Auto-generated method stubstopService(new Intent(MainActivity.this,RocketService.class));finish();}});}
}

2、RocketService 火箭服务类

该类主要是实现小火箭挂载在屏幕窗体

实现屏幕随意拖拽

拖拽到指定位置自动发射

贴代码：

/***结合1、2、3.顺序看 注释比较详细*/
public class RocketService extends Service {private final WindowManager.LayoutParams mParams = new WindowManager.LayoutParams();private WindowManager mWM;private int height;private int width;private View viewToast;private ImageView iv_rocket;private AnimationDrawable drawable;@Overridepublic void onCreate() {// TODO Auto-generated method stubsuper.onCreate();//获取屏幕窗体mWM = (WindowManager) getSystemService(WINDOW_SERVICE);//获取屏幕宽高height = mWM.getDefaultDisplay().getHeight();width = mWM.getDefaultDisplay().getWidth();//开启火箭showRocket();}/*** 开启小火箭*/private void showRocket() {//1、让小火箭默认在左上角显示final WindowManager.LayoutParams params = mParams;params.height = WindowManager.LayoutParams.WRAP_CONTENT;params.width = WindowManager.LayoutParams.WRAP_CONTENT;params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
//                  | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE 默认能够被触摸| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;params.format = PixelFormat.TRANSLUCENT;//在响铃的时候显示吐司,和电话类型一致params.type = WindowManager.LayoutParams.TYPE_PHONE;params.setTitle("Toast");//指定吐司的所在位置(将吐司指定在左上角)params.gravity = Gravity.LEFT+Gravity.TOP;//2、  定义吐司layout布局 -填充给 >view挂载到屏幕上显示viewToast = View.inflate(this, R.layout.rocket_view, null);iv_rocket = (ImageView) viewToast.findViewById(R.id.iv_rocket);//拿到动画的额帧drawable = (AnimationDrawable) iv_rocket.getBackground();//iv_rocket.startAnimation(drawable);//获取背景图片后,让其动起来drawable.start();//3、图片手指拖动到额监听事件iv_rocket.setOnTouchListener(new OnTouchListener() {//开始的 x y 坐标private int startX; private int startY;@Overridepublic boolean onTouch(View v, MotionEvent event) {switch (event.getAction()) {case MotionEvent.ACTION_DOWN://获取按下的xy坐标startX = (int) event.getRawX();startY = (int) event.getRawY();break;case MotionEvent.ACTION_MOVE://获取移动xy坐标和按下的xy坐标做差,做差得到的值小火箭移动的距离//移动过程中做容错处理//第一次移动到的位置,作为第二次移动的初始位置int moveX = (int) event.getRawX();int moveY = (int) event.getRawY();//做差拿到移动距离int disX = moveX - startX;int disY = moveY - startY;//将按下的坐标+移动距离 = 当前位置重新赋值给窗体params.x = params.x+disX;params.y = params.y+disY;//在窗体中仅仅告知吐司的左上角的坐标if(params.x<0){params.x = 0;}if(params.y<0){params.y = 0;}if(params.x>width-viewToast.getWidth()){params.x = width-viewToast.getWidth();}if(params.y>height-22-viewToast.getHeight()){params.y = height-22-viewToast.getHeight();}//告知吐司在窗体上刷新mWM.updateViewLayout(viewToast, params);//在第一次移动完成后,将最终坐标作为第二次移动的起始坐标startX = (int) event.getRawX();startY = (int) event.getRawY();break;case MotionEvent.ACTION_UP://手指放开的时候,如果放手坐标,则指定区域内if(params.x>200 && params.x<300 && params.y>300){//火箭的发射sendRocket();//在开启火箭过程中,去开启一个新的activity,activity透明,在此activity中放置两张图片(淡入淡出效果)Intent intent = new Intent(getApplicationContext(),BackgroundActivity.class);//指定开启新的activity任务栈intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);startActivity(intent);}break;}return true;}});//4、将自定义的tosat布局添加到窗体管理器中mWM.addView(viewToast, params);}private Handler handler = new Handler(){public void handleMessage(Message msg) {mParams.y = (Integer) msg.obj;//更新到火箭上(窗体)mWM.updateViewLayout(viewToast, mParams);};};private void sendRocket() {new Thread(){public void run() {for(int i=0;i<11;i++){int y = 350 - i*35;//350 是当前模拟器高//睡眠try {Thread.sleep(20);} catch (InterruptedException e) {e.printStackTrace();}//通过消息机制,将y轴坐标作为主线程火箭竖直方向上的显示位置Message msg = Message.obtain();msg.obj = y;handler.sendMessage(msg);}};}.start();}@Overridepublic void onDestroy() {if(mWM!=null && viewToast!=null){mWM.removeView(viewToast);}super.onDestroy();}@Overridepublic IBinder onBind(Intent intent) {return null;}
}

3、BackgroundActivity 小火箭尾气

该类完成小火箭发射尾气动画的实现
代码不多主要就是一个淡入淡出的动画

public class BackgroundActivity extends Activity {private Handler mHandler = new Handler(){public void handleMessage(android.os.Message msg) {//结束此activity,销毁尾气图片finish();};};@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);//设置尾气图片setContentView(R.layout.activity_background);ImageView iv_top = (ImageView) findViewById(R.id.iv_top);ImageView iv_bottom = (ImageView) findViewById(R.id.iv_bottom);//尾气淡入淡出效果,动画是异步操作,并不会去阻塞主线程AlphaAnimation alphaAnimation = new AlphaAnimation(0, 1);alphaAnimation.setDuration(500);iv_top.startAnimation(alphaAnimation);iv_bottom.startAnimation(alphaAnimation);//将尾气消失,发送一个延时消息,1秒以后结束此activity,mHandler.sendEmptyMessageDelayed(0, 1000);}
}

清单文件中的注册需要加一个主题：

<activity android:theme="@android:style/Theme.Translucent.NoTitleBar"android:name="com.example.demo2_rocket.BackgroundActivity"/>

xml布局

<?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" ><ImageView android:id="@+id/iv_bottom"android:layout_alignParentBottom="true"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="@drawable/desktop_smoke_m"/><ImageView android:id="@+id/iv_top"android:layout_above="@id/iv_bottom"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="@drawable/desktop_smoke_t"/>
</RelativeLayout>

动画rocket_bg.xml

<?xml version="1.0" encoding="utf-8"?>
<animation-list xmlns:android="http://schemas.android.com/apk/res/android" ><item android:drawable="@drawable/desktop_rocket_launch_1"android:duration="200"/> <item android:drawable="@drawable/desktop_rocket_launch_2"android:duration="200"/> 
</animation-list>