android面试题-Service中弹出Dialog

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AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);            alertDialog.setMessage("有新消息，是否查看？");            alertDialog.setPositiveButton("否",                    new DialogInterface.OnClickListener()                    {                        public void onClick(DialogInterface dialog, int which)                        {                        }                    });            alertDialog.setNegativeButton("是",                    new DialogInterface.OnClickListener()                    {                        public void onClick(DialogInterface dialog, int which)                        {                        }                    });            ad = alertDialog.create();            ad.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);              ad.setCanceledOnTouchOutside(false);//点击外面区域不会让dialog消失                                           ad.show();

添加权限

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

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {    if (!Settings.canDrawOverlays(this)) {        Intent intent = new Intent(Settings.ACTION_MANAGE_OVERLAY_PERMISSION,                Uri.parse("package:" + getPackageName()));        startActivityForResult(intent, 1);    }}

@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {    if (requestCode == 1) {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {            if (!Settings.canDrawOverlays(this)) {                // SYSTEM_ALERT_WINDOW permission not granted...            }        }    }}

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