我正在尝试在我添加到活动的Fragment中请求位置权限。我在我的活动中处理@override onRequestPermissionsResult然后我尝试通过调用来关闭我的片段：
我创建了一个片段，用于在我的活动的onCreate中显示和请求权限：
public class HomeActivity extends BaseTabBarActivity {
private static final int ACCESS_LOCATION = 1;
private ActivityHomeBinding binding;
PermissionFragment permissionFragment;
FragmentManager fragmentManager;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
permissionFragment = new PermissionFragment();
fragmentManager = getSupportFragmentManager();
binding = DataBindingUtil.setContentView(this, R.layout.activity_home);
Account account = new Account();
binding.setAccount(account);
if (!checkLocationPermission()) {
permissionFragment.show(fragmentManager, "Permission Dialog");
}
}
然后我在我的片段中请求权限，如下所示：
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
binding = DataBindingUtil.inflate(inflater, R.layout.fragment_permission, container, false);
binding.setPermissionType(PermissionType.LOCATION);
binding.btnProceed.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (binding.getPermissionType().equals(PermissionType.LOCATION)) {
if (ContextCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(getActivity(), new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, ACCESS_LOCATION);
return;
}
closePermissionDialog();
} else {
Intent callGPSSettingIntent = new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(callGPSSettingIntent);
}
}
});
然后当我从权限请求返回时：
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
if (requestCode == ACCESS_LOCATION) {
if (permissions[0].equals(Manifest.permission.ACCESS_FINE_LOCATION)
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
permissionFragment.dismiss();
} else {
permissionFragment.binding.setPermissionType(PermissionFragment.PermissionType.LOCATION_DENIED);
}
}
}
导致错误的代码在片段中，并且是这种方法：
public void closePermissionDialog() {
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_CLOSE);
ft.detach(this);
ft.commitAllowingStateLoss();
}
当尝试提交此事务时，它会在保存Activity的onSaveInstanceState之后发生，根据Android文档导致我的错误：
＆＃34;事务只能在其包含活动保存其状态之前使用此方法提交。如果在该点之后尝试提交，则将引发异常。这是因为如果活动需要从其状态恢复，则提交后的状态可能会丢失。请参阅commitAllowingStateLoss（）以了解可能丢失提交的情况。＆＃34; - 此页面上的Android Google文档：https://developer.android.com/reference/android/app/FragmentTransaction.html#commit()
根除防止这种活动周期流动的最佳策略是什么？我显然没有采取任何正确的方法来处理活动和片段之间的流程。
我收到以下错误：
java.lang.RuntimeException: Failure delivering result ResultInfo{who=@android:requestPermissions:, request=1, result=-1, data=Intent { act=android.content.pm.action.REQUEST_PERMISSIONS (has extras) }} to activity {.android/.activities.HomeActivity}: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.app.ActivityThread.deliverResults(ActivityThread.java:3699)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
at android.app.ActivityThread.-wrap16(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:2044)
at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:2067)
at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:680)
at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:634)
at android.support.v4.app.DialogFragment.dismissInternal(DialogFragment.java:205)
at android.support.v4.app.DialogFragment.dismiss(DialogFragment.java:171)
at com.activities.HomeActivity.onRequestPermissionsResult(HomeActivity.java:92)
at android.app.Activity.dispatchRequestPermissionsResult(Activity.java:6582)
at android.app.Activity.dispatchActivityResult(Activity.java:6460)
at android.app.ActivityThread.deliverResults(ActivityThread.java:3695)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:3742)
at android.app.ActivityThread.-wrap16(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
答案 0 :(得分：0)
所以我使用ActivityCompat.requestPermissions移动了检查权限，这总是导致onSaveInstanceState回调在被调用的事件被调用之前被调用的活动，使用Fragment的requestPermission保证在我的Activity：
binding.btnProceed.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (binding.getPermissionType().equals(PermissionType.LOCATION)) {
if (ContextCompat.checkSelfPermission(getContext(), Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
requestPermissions(new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, ACCESS_LOCATION);
return;
}
closePermissionDialog();
} else {
Intent callGPSSettingIntent = new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(callGPSSettingIntent);
}
}
});