android实现可自由移动、监听点击事件的悬浮窗

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

/**
 * Created by shiwe on 2017/3/7.
 * 悬浮窗管理
 * 创建，移除
 * 单例模式
 */

public class MyWindowManager {

 private FloatNormalView normalView;
 private FloatControlView controlView;

 private static MyWindowManager instance;

 private MyWindowManager() {
 }

 public static MyWindowManager getInstance() {
  if (instance == null)
   instance = new MyWindowManager();
  return instance;
 }


 /**
  * 创建小型悬浮窗
  */
 public void createNormalView(Context context) {
  if (normalView == null)
   normalView = new FloatNormalView(context);
 }

 /**
  * 移除悬浮窗
  *
  * @param context
  */
 public void removeNormalView(Context context) {
  if (normalView != null) {
   WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
   windowManager.removeView(normalView);
   normalView = null;
  }
 }

 /**
  * 创建小型悬浮窗
  */
 public void createControlView(Context context) {
  if (controlView == null)
   controlView = new FloatControlView(context);
 }

 /**
  * 移除悬浮窗
  *
  * @param context
  */
 public void removeControlView(Context context) {
  if (controlView != null) {
   WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
   windowManager.removeView(controlView);
   controlView = null;
  }
 }
}

public class FloatNormalView extends LinearLayout {

 private Context context = null;
 private View view = null;
 private ImageView ivShowControlView = null;
 private WindowManager.LayoutParams lp = new WindowManager.LayoutParams();
 private static WindowManager windowManager;

 private float mTouchStartX;
 private float mTouchStartY;
 private float x;
 private float y;
 private boolean initViewPlace = false;
 private MyWindowManager myWindowManager;
 private boolean isControlViewShowing = false;

 public FloatNormalView(Context context) {
  super(context);
  this.context = context;
  myWindowManager = MyWindowManager.getInstance();
  LayoutInflater.from(context).inflate(R.layout.float_normal_view, this);
  view = findViewById(R.id.ll_float_normal);
  ivShowControlView = (ImageView) findViewById(R.id.iv_show_control_view);
  windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
  initLayoutParams();
  initEvent();
 }


 /**
  * 初始化参数
  */
 private void initLayoutParams() {
  //屏幕宽高
  int screenWidth = windowManager.getDefaultDisplay().getWidth();
  int screenHeight = windowManager.getDefaultDisplay().getHeight();

  //总是出现在应用程序窗口之上。
  lp.type = WindowManager.LayoutParams.TYPE_PHONE;

  // FLAG_NOT_TOUCH_MODAL不阻塞事件传递到后面的窗口
  // FLAG_NOT_FOCUSABLE 悬浮窗口较小时，后面的应用图标由不可长按变为可长按,不设置这个flag的话，home页的划屏会有问题
  lp.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
    | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL;

  //悬浮窗默认显示的位置
  lp.gravity = Gravity.START | Gravity.TOP;
  //指定位置
  lp.x = screenWidth - view.getLayoutParams().width * 2;
  lp.y = screenHeight / 2 + view.getLayoutParams().height * 2;
  //悬浮窗的宽高
  lp.width = WindowManager.LayoutParams.WRAP_CONTENT;
  lp.height = WindowManager.LayoutParams.WRAP_CONTENT;
  lp.format = PixelFormat.TRANSPARENT;
  windowManager.addView(this, lp);
 }

 /**
  * 设置悬浮窗监听事件
  */
 private void initEvent() {
  ivShowControlView.setOnLongClickListener(new OnLongClickListener() {
   @Override
   public boolean onLongClick(View view) {
    if (!isControlViewShowing) {
     myWindowManager.createControlView(context);
     isControlViewShowing = true;
    } else {
     myWindowManager.removeControlView(context);
     isControlViewShowing = false;
    }
    return true;
   }
  });
  view.setOnTouchListener(new OnTouchListener() {
   @Override
   public boolean onTouch(View v, MotionEvent event) {
    switch (event.getAction()) {
     case MotionEvent.ACTION_DOWN:
      if (!initViewPlace) {
       initViewPlace = true;
       //获取初始位置
       mTouchStartX += (event.getRawX() - lp.x);
       mTouchStartY += (event.getRawY() - lp.y);
      } else {
       //根据上次手指离开的位置与此次点击的位置进行初始位置微调
       mTouchStartX += (event.getRawX() - x);
       mTouchStartY += (event.getRawY() - y);
      }
      break;
     case MotionEvent.ACTION_MOVE:
      // 获取相对屏幕的坐标，以屏幕左上角为原点
      x = event.getRawX();
      y = event.getRawY();
      updateViewPosition();
      break;

     case MotionEvent.ACTION_UP:
      break;
    }
    return true;
   }
  });
 }

 /**
  * 更新浮动窗口位置
  */
 private void updateViewPosition() {
  lp.x = (int) (x - mTouchStartX);
  lp.y = (int) (y - mTouchStartY);
  windowManager.updateViewLayout(this, lp);
 }

public class MainActivity extends AppCompatActivity {

 MyWindowManager myWindowManager;

 @Override
 protected void onCreate(@Nullable Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  myWindowManager = MyWindowManager.getInstance();
  myWindowManager.createNormalView(this.getApplicationContext());
 }
}