Android实现QQ手机管家悬浮小火箭效果

<?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/launcher_img" 
 android:layout_width="200dp" 
 android:layout_height="88dp" 
 android:src="@drawable/launcher_bg_hold" 
 /> 
</LinearLayout> 

public class RocketLauncher extends LinearLayout { 
 /** 
 * 记录火箭发射台的宽度 
 */ 
 public static int width; 
 /** 
 * 记录火箭发射台的高度 
 */ 
 public static int height; 
 /** 
 * 火箭发射台的背景图片 
 */ 
 private ImageView launcherImg; 
 public RocketLauncher(Context context) { 
 super(context); 
 LayoutInflater.from(context).inflate(R.layout.launcher, this); 
 launcherImg = (ImageView) findViewById(R.id.launcher_img); 
 width = launcherImg.getLayoutParams().width; 
 height = launcherImg.getLayoutParams().height; 
 } 
 /** 
 * 更新火箭发射台的显示状态。如果小火箭被拖到火箭发射台上，就显示发射。 
 */ 
 public void updateLauncherStatus(boolean isReadyToLaunch) { 
 if (isReadyToLaunch) { 
 launcherImg.setImageResource(R.drawable.launcher_bg_fire); 
 } else { 
 launcherImg.setImageResource(R.drawable.launcher_bg_hold); 
 } 
 } 
} 

public class MyWindowManager { 
 /** 
 * 小悬浮窗View的实例 
 */ 
 private static FloatWindowSmallView smallWindow; 
 /** 
 * 大悬浮窗View的实例 
 */ 
 private static FloatWindowBigView bigWindow; 
 /** 
 * 火箭发射台的实例 
 */ 
 private static RocketLauncher rocketLauncher; 
 /** 
 * 小悬浮窗View的参数 
 */ 
 private static LayoutParams smallWindowParams; 
 /** 
 * 大悬浮窗View的参数 
 */ 
 private static LayoutParams bigWindowParams; 
 /** 
 * 火箭发射台的参数 
 */ 
 private static LayoutParams launcherParams; 
 /** 
 * 用于控制在屏幕上添加或移除悬浮窗 
 */ 
 private static WindowManager mWindowManager; 
 /** 
 * 用于获取手机可用内存 
 */ 
 private static ActivityManager mActivityManager; 
 /** 
 * 创建一个小悬浮窗。初始位置为屏幕的右部中间位置。 
 */ 
 public static void createSmallWindow(Context context) { 
 WindowManager windowManager = getWindowManager(context); 
 int screenWidth = windowManager.getDefaultDisplay().getWidth(); 
 int screenHeight = windowManager.getDefaultDisplay().getHeight(); 
 if (smallWindow == null) { 
 smallWindow = new FloatWindowSmallView(context); 
 if (smallWindowParams == null) { 
 smallWindowParams = new LayoutParams(); 
 smallWindowParams.type = LayoutParams.TYPE_SYSTEM_ALERT; 
 smallWindowParams.format = PixelFormat.RGBA_8888; 
 smallWindowParams.flags = LayoutParams.FLAG_NOT_TOUCH_MODAL 
  | LayoutParams.FLAG_NOT_FOCUSABLE; 
 smallWindowParams.gravity = Gravity.LEFT | Gravity.TOP; 
 smallWindowParams.width = FloatWindowSmallView.windowViewWidth; 
 smallWindowParams.height = FloatWindowSmallView.windowViewHeight; 
 smallWindowParams.x = screenWidth; 
 smallWindowParams.y = screenHeight / 2; 
 } 
 smallWindow.setParams(smallWindowParams); 
 windowManager.addView(smallWindow, smallWindowParams); 
 } 
 } 
 /** 
 * 将小悬浮窗从屏幕上移除。 
 */ 
 public static void removeSmallWindow(Context context) { 
 if (smallWindow != null) { 
 WindowManager windowManager = getWindowManager(context); 
 windowManager.removeView(smallWindow); 
 smallWindow = null; 
 } 
 } 
 /** 
 * 创建一个大悬浮窗。位置为屏幕正中间。 
 */ 
 public static void createBigWindow(Context context) { 
 WindowManager windowManager = getWindowManager(context); 
 int screenWidth = windowManager.getDefaultDisplay().getWidth(); 
 int screenHeight = windowManager.getDefaultDisplay().getHeight(); 
 if (bigWindow == null) { 
 bigWindow = new FloatWindowBigView(context); 
 if (bigWindowParams == null) { 
 bigWindowParams = new LayoutParams(); 
 bigWindowParams.x = screenWidth / 2 
  - FloatWindowBigView.viewWidth / 2; 
 bigWindowParams.y = screenHeight / 2 
  - FloatWindowBigView.viewHeight / 2; 
 bigWindowParams.type = LayoutParams.TYPE_PHONE; 
 bigWindowParams.format = PixelFormat.RGBA_8888; 
 bigWindowParams.gravity = Gravity.LEFT | Gravity.TOP; 
 bigWindowParams.width = FloatWindowBigView.viewWidth; 
 bigWindowParams.height = FloatWindowBigView.viewHeight; 
 } 
 windowManager.addView(bigWindow, bigWindowParams); 
 } 
 } 
 /** 
 * 将大悬浮窗从屏幕上移除。 
 */ 
 public static void removeBigWindow(Context context) { 
 if (bigWindow != null) { 
 WindowManager windowManager = getWindowManager(context); 
 windowManager.removeView(bigWindow); 
 bigWindow = null; 
 } 
 } 
 /** 
 * 创建一个火箭发射台，位置为屏幕底部。 
 */ 
 public static void createLauncher(Context context) { 
 WindowManager windowManager = getWindowManager(context); 
 int screenWidth = windowManager.getDefaultDisplay().getWidth(); 
 int screenHeight = windowManager.getDefaultDisplay().getHeight(); 
 if (rocketLauncher == null) { 
 rocketLauncher = new RocketLauncher(context); 
 if (launcherParams == null) { 
 launcherParams = new LayoutParams(); 
 launcherParams.x = screenWidth / 2 - RocketLauncher.width / 2; 
 launcherParams.y = screenHeight - RocketLauncher.height; 
 launcherParams.type = LayoutParams.TYPE_PHONE; 
 launcherParams.format = PixelFormat.RGBA_8888; 
 launcherParams.gravity = Gravity.LEFT | Gravity.TOP; 
 launcherParams.width = RocketLauncher.width; 
 launcherParams.height = RocketLauncher.height; 
 } 
 windowManager.addView(rocketLauncher, launcherParams); 
 } 
 } 
 /** 
 * 将火箭发射台从屏幕上移除。 
 */ 
 public static void removeLauncher(Context context) { 
 if (rocketLauncher != null) { 
 WindowManager windowManager = getWindowManager(context); 
 windowManager.removeView(rocketLauncher); 
 rocketLauncher = null; 
 } 
 } 
 /** 
 * 更新火箭发射台的显示状态。 
 */ 
 public static void updateLauncher() { 
 if (rocketLauncher != null) { 
 rocketLauncher.updateLauncherStatus(isReadyToLaunch()); 
 } 
 } 
 /** 
 * 更新小悬浮窗的TextView上的数据，显示内存使用的百分比。 
 * 
 * @param context 
 * 可传入应用程序上下文。 
 */ 
 public static void updateUsedPercent(Context context) { 
 if (smallWindow != null) { 
 TextView percentView = (TextView) smallWindow 
  .findViewById(R.id.percent); 
 percentView.setText(getUsedPercentValue(context)); 
 } 
 } 
 /** 
 * 是否有悬浮窗(包括小悬浮窗和大悬浮窗)显示在屏幕上。 
 * 
 * @return 有悬浮窗显示在桌面上返回true，没有的话返回false。 
 */ 
 public static boolean isWindowShowing() { 
 return smallWindow != null || bigWindow != null; 
 } 
 /** 
 * 判断小火箭是否准备好发射了。 
 * 
 * @return 当火箭被发到发射台上返回true，否则返回false。 
 */ 
 public static boolean isReadyToLaunch() { 
 if ((smallWindowParams.x > launcherParams.x && smallWindowParams.x 
 + smallWindowParams.width < launcherParams.x 
 + launcherParams.width) 
 && (smallWindowParams.y + smallWindowParams.height > launcherParams.y)) { 
 return true; 
 } 
 return false; 
 } 
 /** 
 * 如果WindowManager还未创建，则创建一个新的WindowManager返回。否则返回当前已创建的WindowManager。 
 * 
 * @param context 
 * 必须为应用程序的Context. 
 * @return WindowManager的实例，用于控制在屏幕上添加或移除悬浮窗。 
 */ 
 private static WindowManager getWindowManager(Context context) { 
 if (mWindowManager == null) { 
 mWindowManager = (WindowManager) context 
  .getSystemService(Context.WINDOW_SERVICE); 
 } 
 return mWindowManager; 
 } 
 /** 
 * 如果ActivityManager还未创建，则创建一个新的ActivityManager返回。否则返回当前已创建的ActivityManager。 
 * 
 * @param context 
 * 可传入应用程序上下文。 
 * @return ActivityManager的实例，用于获取手机可用内存。 
 */ 
 private static ActivityManager getActivityManager(Context context) { 
 if (mActivityManager == null) { 
 mActivityManager = (ActivityManager) context 
  .getSystemService(Context.ACTIVITY_SERVICE); 
 } 
 return mActivityManager; 
 } 
 /** 
 * 计算已使用内存的百分比，并返回。 
 * 
 * @param context 
 * 可传入应用程序上下文。 
 * @return 已使用内存的百分比，以字符串形式返回。 
 */ 
 public static String getUsedPercentValue(Context context) { 
 String dir = "/proc/meminfo"; 
 try { 
 FileReader fr = new FileReader(dir); 
 BufferedReader br = new BufferedReader(fr, 2048); 
 String memoryLine = br.readLine(); 
 String subMemoryLine = memoryLine.substring(memoryLine 
  .indexOf("MemTotal:")); 
 br.close(); 
 long totalMemorySize = Integer.parseInt(subMemoryLine.replaceAll( 
  "\\D+", "")); 
 long availableSize = getAvailableMemory(context) / 1024; 
 int percent = (int) ((totalMemorySize - availableSize) 
  / (float) totalMemorySize * 100); 
 return percent + "%"; 
 } catch (IOException e) { 
 e.printStackTrace(); 
 } 
 return "悬浮窗"; 
 } 
 /** 
 * 获取当前可用内存，返回数据以字节为单位。 
 * 
 * @param context 
 * 可传入应用程序上下文。 
 * @return 当前可用内存。 
 */ 
 private static long getAvailableMemory(Context context) { 
 ActivityManager.MemoryInfo mi = new ActivityManager.MemoryInfo(); 
 getActivityManager(context).getMemoryInfo(mi); 
 return mi.availMem; 
 } 
}

public class FloatWindowSmallView extends LinearLayout { 
 /** 
 * 记录小悬浮窗的宽度 
 */ 
 public static int windowViewWidth; 
 /** 
 * 记录小悬浮窗的高度 
 */ 
 public static int windowViewHeight; 
 /** 
 * 记录系统状态栏的高度 
 */ 
 private static int statusBarHeight; 
 /** 
 * 用于更新小悬浮窗的位置 
 */ 
 private WindowManager windowManager; 
 /** 
 * 小悬浮窗的布局 
 */ 
 private LinearLayout smallWindowLayout; 
 /** 
 * 小火箭控件 
 */ 
 private ImageView rocketImg; 
 /** 
 * 小悬浮窗的参数 
 */ 
 private WindowManager.LayoutParams mParams; 
 /** 
 * 记录当前手指位置在屏幕上的横坐标值 
 */ 
 private float xInScreen; 
 /** 
 * 记录当前手指位置在屏幕上的纵坐标值 
 */ 
 private float yInScreen; 
 /** 
 * 记录手指按下时在屏幕上的横坐标的值 
 */ 
 private float xDownInScreen; 
 /** 
 * 记录手指按下时在屏幕上的纵坐标的值 
 */ 
 private float yDownInScreen; 
 /** 
 * 记录手指按下时在小悬浮窗的View上的横坐标的值 
 */ 
 private float xInView; 
 /** 
 * 记录手指按下时在小悬浮窗的View上的纵坐标的值 
 */ 
 private float yInView; 
 /** 
 * 记录小火箭的宽度 
 */ 
 private int rocketWidth; 
 /** 
 * 记录小火箭的高度 
 */ 
 private int rocketHeight; 
 /** 
 * 记录当前手指是否按下 
 */ 
 private boolean isPressed; 
 public FloatWindowSmallView(Context context) { 
 super(context); 
 windowManager = (WindowManager) context 
 .getSystemService(Context.WINDOW_SERVICE); 
 LayoutInflater.from(context).inflate(R.layout.float_window_small, this); 
 smallWindowLayout = (LinearLayout) findViewById(R.id.small_window_layout); 
 windowViewWidth = smallWindowLayout.getLayoutParams().width; 
 windowViewHeight = smallWindowLayout.getLayoutParams().height; 
 rocketImg = (ImageView) findViewById(R.id.rocket_img); 
 rocketWidth = rocketImg.getLayoutParams().width; 
 rocketHeight = rocketImg.getLayoutParams().height; 
 TextView percentView = (TextView) findViewById(R.id.percent); 
 percentView.setText(MyWindowManager.getUsedPercentValue(context)); 
 } 
 @Override 
 public boolean onTouchEvent(MotionEvent event) { 
 switch (event.getAction()) { 
 case MotionEvent.ACTION_DOWN: 
 isPressed = true; 
 // 手指按下时记录必要数据,纵坐标的值都需要减去状态栏高度 
 xInView = event.getX(); 
 yInView = event.getY(); 
 xDownInScreen = event.getRawX(); 
 yDownInScreen = event.getRawY() - getStatusBarHeight(); 
 xInScreen = event.getRawX(); 
 yInScreen = event.getRawY() - getStatusBarHeight(); 
 break; 
 case MotionEvent.ACTION_MOVE: 
 xInScreen = event.getRawX(); 
 yInScreen = event.getRawY() - getStatusBarHeight(); 
 // 手指移动的时候更新小悬浮窗的状态和位置 
 updateViewStatus(); 
 updateViewPosition(); 
 break; 
 case MotionEvent.ACTION_UP: 
 isPressed = false; 
 if (MyWindowManager.isReadyToLaunch()) { 
 launchRocket(); 
 } else { 
 updateViewStatus(); 
 // 如果手指离开屏幕时，xDownInScreen和xInScreen相等，且yDownInScreen和yInScreen相等，则视为触发了单击事件。 
 if (xDownInScreen == xInScreen && yDownInScreen == yInScreen) { 
  openBigWindow(); 
 } 
 } 
 break; 
 default: 
 break; 
 } 
 return true; 
 } 
 /** 
 * 将小悬浮窗的参数传入，用于更新小悬浮窗的位置。 
 * 
 * @param params 
 * 小悬浮窗的参数 
 */ 
 public void setParams(WindowManager.LayoutParams params) { 
 mParams = params; 
 } 
 /** 
 * 用于发射小火箭。 
 */ 
 private void launchRocket() { 
 MyWindowManager.removeLauncher(getContext()); 
 new LaunchTask().execute(); 
 } 
 /** 
 * 更新小悬浮窗在屏幕中的位置。 
 */ 
 private void updateViewPosition() { 
 mParams.x = (int) (xInScreen - xInView); 
 mParams.y = (int) (yInScreen - yInView); 
 windowManager.updateViewLayout(this, mParams); 
 MyWindowManager.updateLauncher(); 
 } 
 /** 
 * 更新View的显示状态，判断是显示悬浮窗还是小火箭。 
 */ 
 private void updateViewStatus() { 
 if (isPressed && rocketImg.getVisibility() != View.VISIBLE) { 
 mParams.width = rocketWidth; 
 mParams.height = rocketHeight; 
 windowManager.updateViewLayout(this, mParams); 
 smallWindowLayout.setVisibility(View.GONE); 
 rocketImg.setVisibility(View.VISIBLE); 
 MyWindowManager.createLauncher(getContext()); 
 } else if (!isPressed) { 
 mParams.width = windowViewWidth; 
 mParams.height = windowViewHeight; 
 windowManager.updateViewLayout(this, mParams); 
 smallWindowLayout.setVisibility(View.VISIBLE); 
 rocketImg.setVisibility(View.GONE); 
 MyWindowManager.removeLauncher(getContext()); 
 } 
 } 
 /** 
 * 打开大悬浮窗，同时关闭小悬浮窗。 
 */ 
 private void openBigWindow() { 
 MyWindowManager.createBigWindow(getContext()); 
 MyWindowManager.removeSmallWindow(getContext()); 
 } 
 /** 
 * 用于获取状态栏的高度。 
 * 
 * @return 返回状态栏高度的像素值。 
 */ 
 private int getStatusBarHeight() { 
 if (statusBarHeight == 0) { 
 try { 
 Class<?> c = Class.forName("com.android.internal.R$dimen"); 
 Object o = c.newInstance(); 
 Field field = c.getField("status_bar_height"); 
 int x = (Integer) field.get(o); 
 statusBarHeight = getResources().getDimensionPixelSize(x); 
 } catch (Exception e) { 
 e.printStackTrace(); 
 } 
 } 
 return statusBarHeight; 
 } 
 /** 
 * 开始执行发射小火箭的任务。 
 * 
 * @author guolin 
 */ 
 class LaunchTask extends AsyncTask<Void, Void, Void> { 
 
 @Override 
 protected Void doInBackground(Void... params) { 
 // 在这里对小火箭的位置进行改变，从而产生火箭升空的效果 
 while (mParams.y > 0) { 
 mParams.y = mParams.y - 10; 
 publishProgress(); 
 try { 
  Thread.sleep(8); 
 } catch (InterruptedException e) { 
  e.printStackTrace(); 
 } 
 } 
 return null; 
 } 
 @Override 
 protected void onProgressUpdate(Void... values) { 
 windowManager.updateViewLayout(FloatWindowSmallView.this, mParams); 
 } 
 
 @Override 
 protected void onPostExecute(Void result) { 
 // 火箭升空结束后，回归到悬浮窗状态 
 updateViewStatus(); 
 mParams.x = (int) (xDownInScreen - xInView); 
 mParams.y = (int) (yDownInScreen - yInView); 
 windowManager.updateViewLayout(FloatWindowSmallView.this, mParams); 
 } 
 } 
} 

<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW" /> 
<uses-permission android:name="android.permission.GET_TASKS" />