Android应用内悬浮窗的实现方案示例

@Override
  public boolean onTouchEvent(MotionEvent event) {
    // 获取相对屏幕的坐标，即以屏幕左上角为原点
    int x = (int) event.getRawX();
    int y = (int) event.getRawY();
    //下面的这些事件，跟图标的移动无关，为了区分开拖动和点击事件
    int action = event.getAction();
    switch (action) {
      case MotionEvent.ACTION_DOWN:
        startTime = System.currentTimeMillis();
        mTouchStartX = event.getX();
        mTouchStartY = event.getY();
        break;
      case MotionEvent.ACTION_MOVE:
        //图标移动的逻辑在这里
        float mMoveStartX = event.getX();
        float mMoveStartY = event.getY();
        // 如果移动量大于3才移动
        if (Math.abs(mTouchStartX - mMoveStartX) > 3
            && Math.abs(mTouchStartY - mMoveStartY) > 3) {
          // 更新浮动窗口位置参数
          mWmParams.x = (int) (x - mTouchStartX);
          mWmParams.y = (int) (y - mTouchStartY);
          mWindowManager.updateViewLayout(this, mWmParams);
          return false;
        }
        break;
      case MotionEvent.ACTION_UP:
        endTime = System.currentTimeMillis();
        //当从点击到弹起小于半秒的时候,则判断为点击,如果超过则不响应点击事件
        if ((endTime - startTime) > 0.1 * 1000L) {
          isclick = false;
        } else {
          isclick = true;
        }
        break;
    }
    //响应点击事件
    if (isclick) {
      Toast.makeText(mContext, "我是大傻叼", Toast.LENGTH_SHORT).show();
    }
    return true;
  }

// 如果移动量大于3才移动
if (Math.abs(mTouchStartX - mMoveStartX) > 3 && Math.abs(mTouchStartY - mMoveStartY) > 3) 

/**
 * 悬浮窗在服务中创建，通过暴露接口FloatCallBack与Activity进行交互
 */
public class FloatMonkService extends Service implements FloatCallBack {
  /**
   * home键监听
   */
  private HomeWatcherReceiver mHomeKeyReceiver;

  @Override
  public void onCreate() {
    super.onCreate();
    FloatActionController.getInstance().registerCallLittleMonk(this);
    //注册广播接收者
    mHomeKeyReceiver = new HomeWatcherReceiver();
    final IntentFilter homeFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
    registerReceiver(mHomeKeyReceiver, homeFilter);
    //初始化悬浮窗UI
    initWindowData();
  }

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

  /**
   * 初始化WindowManager
   */
  private void initWindowData() {
    FloatWindowManager.createFloatWindow(this);
  }

  @Override
  public void onDestroy() {
    super.onDestroy();
    //移除悬浮窗
    FloatWindowManager.removeFloatWindowManager();
    //注销广播接收者
    if (null != mHomeKeyReceiver) {
      unregisterReceiver(mHomeKeyReceiver);
    }
  }

  /////////////////////////////////////////////////////////实现接口////////////////////////////////////////////////////
  @Override
  public void guideUser(int type) {
    FloatWindowManager.updataRedAndDialog(this);
  }


  /**
   * 悬浮窗的隐藏
   */
  @Override
  public void hide() {
    FloatWindowManager.hide();
  }

  /**
   * 悬浮窗的显示
   */
  @Override
  public void show() {
    FloatWindowManager.show();
  }

  /**
   * 添加可领取的数量
   */
  @Override
  public void addObtainNumer() {
    FloatWindowManager.addObtainNumer(this);
    guideUser(4);
  }

  /**
   * 减少可领取的数量
   */
  @Override
  public void setObtainNumber(int number) {
    FloatWindowManager.setObtainNumber(this, number);
  }
}

/**
   * 创建一个小悬浮窗。初始位置为屏幕的右下角位置。
   */
  public static void createFloatWindow(Context context) {
    wmParams = new WindowManager.LayoutParams();
    WindowManager windowManager = getWindowManager(context);
    mFloatLayout = new FloatLayout(context);
    if (Build.VERSION.SDK_INT >= 24) { /*android7.0不能用TYPE_TOAST*/
      wmParams.type = WindowManager.LayoutParams.TYPE_PHONE;
    } else { /*以下代码块使得android6.0之后的用户不必再去手动开启悬浮窗权限*/
      String packname = context.getPackageName();
      PackageManager pm = context.getPackageManager();
      boolean permission = (PackageManager.PERMISSION_GRANTED == pm.checkPermission("android.permission.SYSTEM_ALERT_WINDOW", packname));
      if (permission) {
        wmParams.type = WindowManager.LayoutParams.TYPE_PHONE;
      } else {
        wmParams.type = WindowManager.LayoutParams.TYPE_TOAST;
      }
    }

    //设置图片格式，效果为背景透明
    wmParams.format = PixelFormat.RGBA_8888;
    //设置浮动窗口不可聚焦（实现操作除浮动窗口外的其他可见窗口的操作）
    wmParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
    //调整悬浮窗显示的停靠位置为左侧置顶
    wmParams.gravity = Gravity.START | Gravity.TOP;

    DisplayMetrics dm = new DisplayMetrics();
    //取得窗口属性
    mWindowManager.getDefaultDisplay().getMetrics(dm);
    //窗口的宽度
    int screenWidth = dm.widthPixels;
    //窗口高度
    int screenHeight = dm.heightPixels;
    //以屏幕左上角为原点，设置x、y初始值，相对于gravity
    wmParams.x = screenWidth;
    wmParams.y = screenHeight;

    //设置悬浮窗口长宽数据
    wmParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
    wmParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
    mFloatLayout.setParams(wmParams);
    windowManager.addView(mFloatLayout, wmParams);
    mHasShown = true;
    //是否展示小红点展示
    checkRedDot(context);
  }

/**
   * 返回当前已创建的WindowManager。
   */
  private static WindowManager getWindowManager(Context context) {
    if (mWindowManager == null) {
      mWindowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    }
    return mWindowManager;
  }

 if (Build.VERSION.SDK_INT >= 24) { /*android7.0不能用TYPE_TOAST*/
      wmParams.type = WindowManager.LayoutParams.TYPE_PHONE;
    } else { /*以下代码块使得android6.0之后的用户不必再去手动开启悬浮窗权限*/
      String packname = context.getPackageName();
      PackageManager pm = context.getPackageManager();
      boolean permission = (PackageManager.PERMISSION_GRANTED == pm.checkPermission("android.permission.SYSTEM_ALERT_WINDOW", packname));
      if (permission) {
        wmParams.type = WindowManager.LayoutParams.TYPE_PHONE;
      } else {
        wmParams.type = WindowManager.LayoutParams.TYPE_TOAST;
      }
    }

/**
 * Author:xishuang
 * Date:2017.08.01
 * Des:与悬浮窗交互的控制类，真正的实现逻辑不在这
 */
public class FloatActionController {

  private FloatActionController() {
  }

  public static FloatActionController getInstance() {
    return LittleMonkProviderHolder.sInstance;
  }

  // 静态内部类
  private static class LittleMonkProviderHolder {
    private static final FloatActionController sInstance = new FloatActionController();
  }

  private FloatCallBack mCallLittleMonk;

  /**
   * 开启服务悬浮窗
   */
  public void startMonkServer(Context context) {
    Intent intent = new Intent(context, FloatMonkService.class);
    context.startService(intent);
  }

  /**
   * 关闭悬浮窗
   */
  public void stopMonkServer(Context context) {
    Intent intent = new Intent(context, FloatMonkService.class);
    context.stopService(intent);
  }

  /**
   * 注册监听
   */
  public void registerCallLittleMonk(FloatCallBack callLittleMonk) {
    mCallLittleMOnk= callLittleMonk;
  }

  /**
   * 悬浮窗的显示
   */
  public void show() {
    if (mCallLittleMOnk== null) return;
    mCallLittleMonk.show();
  }

  /**
   * 悬浮窗的隐藏
   */
  public void hide() {
    if (mCallLittleMOnk== null) return;
    mCallLittleMonk.hide();
  }
}