android.support.v4.app.ActivityCompat.OnRequestPermissionsResultCallback中的Strange ArrayIndexOutOfBoundsException

Question

我在Play商店控制台收到一个与android.support.v4.app.ActivityCompat.OnRequestPermissionsResultCallback有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.根据文件

int:相应权限的授予结果,即PERMISSION_GRANTED或PERMISSION_DENIED.永远不会.

grantResults不会为null,但也没有说任何关于它不包含值的内容.此外,似乎回调将包含至少一个值,PERMISSION_GRANTED或者PERMISSION_DENIED.这是一个错误还是我误解了文档？

Answer 1

有关权限的文档说

如果取消请求,则结果数组为空.

这似乎是你的情况,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);
    }
}