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());
}
}