package com.itheima52.rocket;

import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.graphics.PixelFormat;
import android.graphics.drawable.AnimationDrawable;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.WindowManager;
import android.widget.ImageView;

/*
 * 主界面开启一个服务
    startService(new Intent(this, RocketService.class));
    finish();
    stopService(new Intent(this, RocketService.class));
    finish();
*/
public class RocketService extends Service {

    private WindowManager.LayoutParams params;
    private int winWidth;
    private int winHeight;
    private WindowManager mWM;
    private View view;

    private int startX;
    private int startY;

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();

        mWM = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);//WindowManager可以在手机屏幕上显示，而不用依赖于某个activity布局文件。

        // 获取屏幕宽高
        winWidth = mWM.getDefaultDisplay().getWidth();
        winHeight = mWM.getDefaultDisplay().getHeight();

        params = new WindowManager.LayoutParams();
        params.height = WindowManager.LayoutParams.WRAP_CONTENT;
        params.width = WindowManager.LayoutParams.WRAP_CONTENT;
        params.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON;
        params.format = PixelFormat.TRANSLUCENT;
        params.type = WindowManager.LayoutParams.TYPE_PHONE;// 电话窗口。它用于电话交互（特别是呼入）。它置于所有应用程序之上，状态栏之下。
        params.gravity = Gravity.LEFT + Gravity.TOP;// 将重心位置设置为左上方,
                                                    // 也就是(0,0)从左上方开始,而不是默认的重心位置
        params.setTitle("Toast");

        view = View.inflate(this, R.layout.rocket, null);// 初始化火箭布局

        // 初始化火箭帧动画
        ImageView ivRocket = (ImageView) view.findViewById(R.id.iv_rocket);
        /*iv_rocket.xml
        <?xml version="1.0" encoding="utf-8"?>
        <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical" >
            <ImageView
                android:id="@+id/iv_rocket"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:src="@drawable/desktop_rocket_launch_1" />        火箭图片
        </LinearLayout>*/
        
        //火箭冒火帧动画，火苗一直闪烁，
        ivRocket.setBackgroundResource(R.drawable.anim_rocket);
        /*
        anim_rocket.xml
        <?xml version="1.0" encoding="utf-8"?>
        <animation-list xmlns:android="http://schemas.android.com/apk/res/android" >
          2张图片切换，200毫秒，
            <item
                android:drawable="@drawable/desktop_rocket_launch_1"
                android:duration="200"/>
            <item
                android:drawable="@drawable/desktop_rocket_launch_2"
                android:duration="200"/>
        </animation-list>
        */
        AnimationDrawable anim = (AnimationDrawable) ivRocket.getBackground();
        anim.start();

        mWM.addView(view, params);

        view.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    // 初始化起点坐标
                    startX = (int) event.getRawX();
                    startY = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_MOVE:
                    int endX = (int) event.getRawX();
                    int endY = (int) event.getRawY();

                    // 计算移动偏移量
                    int dx = endX - startX;
                    int dy = endY - startY;

                    // 更新浮窗位置，WindowManager里面只能用params来移动
                    params.x += dx;
                    params.y += dy;

                    // 防止坐标偏离屏幕
                    if (params.x < 0) {
                        params.x = 0;
                    }
                    if (params.y < 0) {
                        params.y = 0;
                    }

                    // 防止坐标偏离屏幕
                    if (params.x > winWidth - view.getWidth()) {
                        params.x = winWidth - view.getWidth();
                    }
                    if (params.y > winHeight - view.getHeight()) {
                        params.y = winHeight - view.getHeight();
                    }
                    // System.out.println("x:" + params.x + ";y:" + params.y);
                    mWM.updateViewLayout(view, params);

                    // 重新初始化起点坐标
                    startX = (int) event.getRawX();
                    startY = (int) event.getRawY();
                    break;
                case MotionEvent.ACTION_UP:
                    if (params.x > 100 && params.x < 250 && params.y > winHeight - 120) {
                        System.out.println("发射火箭!!!");
                        sendRocket();

                        // 启动烟雾效果,启动一个Activity,盖住下面的Activity，使得下面的不能点击。
                        Intent intent = new Intent(RocketService.this,BackgroundActivity.class);
                        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);// 通过Service启动Activity,Service不用栈，因此要先启动一个栈来存放activity
                        startActivity(intent);
                    }
                    break;

                default:
                    break;
                }
                return true;
            }
        });
    }

    private Handler mHandler = new Handler() {
        public void handleMessage(android.os.Message msg) {
            // 更新火箭位置
            int y = msg.arg1;
            params.y = y;
            mWM.updateViewLayout(view, params);
        };
    };

    /**
     * 发射火箭
     */
    protected void sendRocket() {
        // 设置火箭居中发射
        params.x = winWidth / 2 - view.getWidth() / 2;
        mWM.updateViewLayout(view, params);

        new Thread() {
            @Override
            public void run() {
                int pos = 380;// 移动总距离
                for (int i = 0; i <= 10; i++) {//移动10次，就移动到顶部了。
                    // 等待一段时间再更新位置,用于控制火箭速度
                    try {
                        Thread.sleep(50);//主线程睡眠会让主线程很卡，因此要用子线城。
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    int y = pos - 38 * i;
                    Message msg = Message.obtain();//不能在子线城更新界面
                    msg.arg1 = y;
                    mHandler.sendMessage(msg);
                }
            }
        }.start();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (mWM != null && view != null) {
            mWM.removeView(view);
            view = null;
        }
    }
}

package com.itheima52.rocket;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.view.animation.AlphaAnimation;
import android.widget.ImageView;
/**
 * 烟雾背景
 */
public class BackgroundActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_bg);
        /*
        activity_bg.xml
        <?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_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentBottom="true"
                android:layout_alignParentLeft="true"
                android:src="@drawable/desktop_smoke_m" />    底下的大烟图片
            <ImageView
                android:id="@+id/iv_top"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_above="@+id/iv_bottom"
                android:layout_alignParentLeft="true"
                android:src="@drawable/desktop_smoke_t" />   中间的细长的烟
        </RelativeLayout>*/
        ImageView ivTop = (ImageView) findViewById(R.id.iv_top);
        ImageView ivBottom = (ImageView) findViewById(R.id.iv_bottom);

        // 渐变动画
        AlphaAnimation anim = new AlphaAnimation(0, 1);
        anim.setDuration(1000);
        anim.setFillAfter(true);// 动画结束后保持状态

        // 运行动画
        ivTop.startAnimation(anim);
        ivBottom.startAnimation(anim);

        new Handler().postDelayed(new Runnable() {//Handler可以发message也可以发Runnable
            @Override
            public void run() {
                finish();
            }
        }, 1000);// 延时1秒后结束activity，不能直接调用finish，因为动画要执行1秒钟。
    }
}

activity的启动模式：
1.Standard:启动A,然后A启动B，B再启动A。
2.SingleTask:首先启动A,A启动B，B启动C,C启动A的时候把B,C干掉，也就是栈里面只能有一个A.
3.SingleTop:启动A,A启动B,B启动C,C再启动C时不会创建新的C而是用原来的C,因为顶上只能有一个C.
4.SingleInstance:只有一个A,不如许别的进来.