添加权限
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
实现
public class FloatView extends FrameLayout {
private boolean isShown;
private Context mContext;
private View view;
private WindowManager mWindowManager;
public FloatView(@NonNull Context context) {
super(context);
mContext = context;
}
public FloatView(@NonNull Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
}
public FloatView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
public void showView() {
view = LayoutInflater.from(mContext).inflate(R.layout.dialog, this);
View cancel = view.findViewById(R.id.tv_cancel);
cancel.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
hidePopupWindow();
}
});
View confirm = view.findViewById(R.id.tv_confirm);
confirm.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(mContext,MainActivity.class);
mContext.startActivity(intent);
hidePopupWindow();
}
});
mWindowManager = (WindowManager) mContext.getSystemService(Context.WINDOW_SERVICE);
//TYPE_TOAST仅适用于4.4+系统，假如要支持更低版本使用TYPE_SYSTEM_ALERT(需要在manifest中声明权限)
// WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams(WindowManager.LayoutParams.TYPE_TOAST);
WindowManager.LayoutParams layoutParams = new WindowManager.LayoutParams(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
// 如果设置了WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE，弹出的View收不到Back键的事件
layoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE;
layoutParams.flags |= WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH;
//layoutParams.flags |= WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS; //no limit适用于超出屏幕的情况，若添加此flag需要增加边界检测逻辑
layoutParams.width = WindowManager.LayoutParams.WRAP_CONTENT;
layoutParams.height = WindowManager.LayoutParams.WRAP_CONTENT;
layoutParams.gravity = Gravity.CENTER;
// 不设置这个弹出框的透明遮罩显示为黑色
layoutParams.format = PixelFormat.TRANSLUCENT;
mWindowManager.addView(view, layoutParams);
isShown = true;
}
/**
* 隐藏弹出框
*/
public void hidePopupWindow() {
if (isShown && null != view) {
mWindowManager.removeView(view);
isShown = false;
}
}
}
窗口类型
FIRST_SYSTEM_WINDOW = 2000 第一个系统窗口
TYPE_STATUS_BAR = FIRST_SYSTEM_WINDOW 状态栏窗口
TYPE_SEARCH_BAR = FIRST_SYSTEM_WINDOW +1 搜索条窗口
TYPE_PHONE = FIRST_SYSTEM_WINDOW + 2 来电显示窗口
TYPE_SYSTEM_ALERT = FIRST_SYSTEM_WINDOW + 3 警告对话框
TYPE_KEYGUARD = FIRST_SYSTEM_WINDOW + 4 屏保
TYPE_TOAST = FIRST_SYSTEM_WINDOW + 5 Toast对应的窗口
TYPE_SYSTEM_OVERLAY = FIRST_SYSTEM_WINDOW + 6 系统覆盖窗口，需要显示在所有窗口之上
TYPE_PRIORITY_PHONE = FIRST_SYSTEM_WINDOW + 7 在屏幕保护下的来电显示窗口
TYPE_SYSTEM_DIALOG = FIRST_SYSTEM_WINDOW + 8 滑动状态条后出现的窗口
TYPE_KEYGUARD_DIALOG = FIRST_SYSTEM_WINDOW + 9 屏保弹出的对话框
TYPE_SYSTEM_ERROR = FIRST_SYSTEM_WINDOW + 10 系统错误窗口
TYPE_INPUT_METHOD = FIRST_SYSTEM_WINDOW + 11 输入法窗口
TYPE_INPUT_METHOD_DIALOG = FIRST_SYSTEM_WINDOW + 12 输入法中备选框对应的窗口
TYPE_WALLPAPER = FIRST_SYSTEM_WINDOW + 13 墙纸对应的窗口
TYPE_STATUS_BAR_PANEL = FIRST_SYSTEM_WINDOW + 14 滑动状态条后出现的窗口
TYPE_SECURE_SYSTEM_OVERLAY = FIRST_SYSTEM_WINDOW + 15 安全系统覆盖窗口，显示在所有窗口之上。
LAST_SYSTEM_WINDOW = 2999 最后一个系统窗口
