Question

我在Play商店控制台中收到与android.support.v4.app.ActivityCompat.OnRequestPermissionsResultCallback

相关的奇怪的越界异常

java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
    at com.example.MyFragmentActivity.onRequestPermissionsResult(MyFragmentActivity.java:2068)
    at android.app.Activity.requestPermissions(Activity.java:4163)
    at android.support.v4.app.ActivityCompatApi23.requestPermissions(ActivityCompat23.java:32)
    at android.support.v4.app.ActivityCompat.requestPermissions(ActivityCompat.java:316)
    at com.example.MyFragmentActivity.onConnected(MyFragmentActivity.java:2048)
    at com.google.android.gms.common.internal.zzk.zzk(Unknown Source)
    at com.google.android.gms.common.api.internal.zzj.zzi(Unknown Source)
    at com.google.android.gms.common.api.internal.zzh.zzpx(Unknown Source)
    at com.google.android.gms.common.api.internal.zzh.onConnected(Unknown Source)
    at com.google.android.gms.common.api.internal.zzl.onConnected(Unknown Source)
    at com.google.android.gms.common.api.internal.zzc.onConnected(Unknown Source)
    at com.google.android.gms.common.internal.zzj$zzg.zzqL(Unknown Source)
    at com.google.android.gms.common.internal.zzj$zza.zzc(Unknown Source)
    at com.google.android.gms.common.internal.zzj$zza.zzw(Unknown Source)
    at com.google.android.gms.common.internal.zzj$zzc.zzqN(Unknown Source)
    at com.google.android.gms.common.internal.zzj$zzb.handleMessage(Unknown Source)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:158)
    at android.app.ActivityThread.main(ActivityThread.java:7229)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

这是我的onRequestPermissionsResult实现

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    switch (requestCode) {
        case REQUEST_CODE_ASK_LOCATION_PERMISSIONS:
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // Permission Granted
                if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
                    mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
                }
                startLocationUpdates();
            } else {
                // Permission Denied
            }
            break;
        default:
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

2068行是这样的：

if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {

我相信它声称grantResults长度为零，这就是抛出java.lang.ArrayIndexOutOfBoundsException的原因。根据{{3}}

int：授予相应权限的结果 PERMISSION_GRANTED或PERMISSION_DENIED。永远不会为空。

grantResults不会为空，但也不会说任何关于它的内容也不包含值。此外，回调似乎至少包含一个值，PERMISSION_GRANTED或PERMISSION_DENIED。这是一个错误还是我误解了文档？

Answer 1

Documentation about permissions说

如果取消请求，结果数组为空。

似乎是你的情况，所以你必须首先检查数组是否为空：

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    switch (requestCode) {
        case REQUEST_CODE_ASK_LOCATION_PERMISSIONS:
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                // Permission Granted
                if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
                    mLastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
                }
                startLocationUpdates();
            } else {
                // Permission Denied
            }
            break;
        default:
            super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }
}

Answer 2

科特林代码检查权限并修复此错误：最好在Kotlin中使用.isNotEmpty（）检查IntArray的大小。

from bs4 import BeautifulSoup
from selenium import webdriver
from selenium.webdriver.common.keys import Keys

driver = webdriver.Firefox()
driver.get('http://www.ratestar.in/')
inputElement = driver.find_element_by_css_selector("#txtStock")
inputElement.send_keys('GM Breweries')
inputElement.send_keys(Keys.ENTER)
driver.wait.until(staleness_of('txtStock')

source = driver.page_source
soup = BeautifulSoup(source)

android.support.v4.app.ActivityCompat.OnRequestPermissionsResultCallback

2 个答案: