1. 添加权限
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
2. 自定义悬浮窗控件
@SuppressLint("ViewConstructor")
public class OEdOverLayView extends FrameLayout {
public static OEdOverLayView create(Context context) {
return new OEdOverLayView(context);
}
public static WindowManager.LayoutParams createLayoutParams() {
final WindowManager.LayoutParams params =
new WindowManager.LayoutParams(WRAP_CONTENT, WRAP_CONTENT, TYPE_TOAST, FLAG_NOT_FOCUSABLE
| FLAG_NOT_TOUCH_MODAL
| FLAG_LAYOUT_NO_LIMITS
| FLAG_LAYOUT_INSET_DECOR
| FLAG_LAYOUT_IN_SCREEN, TRANSLUCENT);
params.gravity = Gravity.TOP | Gravity.LEFT;
return params;
}
private OEdOverLayView(@NonNull Context context) {
super(context);
inflate(context, R.layout.widget_oed_overlay, this);
init();
}
3. 加载控件到桌面
private void addOverLayView() {
if (oEdOverLayView == null) {
oEdOverLayView = OEdOverLayView.create(getApplicationContext());
WindowManager windowManager = (WindowManager) getApplicationContext().getSystemService(WINDOW_SERVICE);
windowManager.addView(oEdOverLayView, OEdOverLayView.createLayoutParams());
oEdOverLayView.getRootLayout().setOnTouchListener(new OEdOverLayMoveListener(windowManager, oEdOverLayView));
}
}
4. 添加移动事件
public class OEdOverLayMoveListener implements View.OnTouchListener {
private final WindowManager windowManager;
private final View view;
private WindowManager.LayoutParams params;
private int initialX;
private int initialY;
private float initialTouchX;
private float initialTouchY;
public OEdOverLayMoveListener(WindowManager windowManager, View view) {
this.windowManager = windowManager;
this.view = view;
this.params = (WindowManager.LayoutParams) view.getLayoutParams();
}
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
//remember the initial position.
initialX = params.x;
initialY = params.y;
//get the touch location
initialTouchX = event.getRawX();
initialTouchY = event.getRawY();
return true;
case MotionEvent.ACTION_MOVE:
//Calculate the X and Y coordinates of the view.
params.x = initialX + (int) (event.getRawX() - initialTouchX);
params.y = initialY + (int) (event.getRawY() - initialTouchY);
//Update the layout with new X & Y coordinate
windowManager.updateViewLayout(view, params);
return true;
}
return true;
}
}
// return ture 会消费掉touch事件，导致onclick无法获取事件
5. 小细节
public static WindowManager.LayoutParams createLayoutParams() {
final WindowManager.LayoutParams params =
new WindowManager.LayoutParams(WRAP_CONTENT, WRAP_CONTENT, TYPE_TOAST, FLAG_NOT_FOCUSABLE
| FLAG_NOT_TOUCH_MODAL
| FLAG_LAYOUT_NO_LIMITS
| FLAG_LAYOUT_INSET_DECOR
| FLAG_LAYOUT_IN_SCREEN, TRANSLUCENT);
params.gravity = Gravity.TOP | Gravity.LEFT;
return params;
}
TYPE_TOAST 和 android.permission.SYSTEM_ALERT_WINDOW 可以在用户一旦取消悬浮窗权限时，添加悬浮窗