问题
I want to call an activity from Dialogfragment, I have attached the code and logcat below for your reference on what I have tried.Kindly provide me your knowledge on it. Thank you.
Intent intent = new Intent(getActivity(), LinkActivity.class);
getActivity().startActivityForResult(intent, 0);
Logcat:
02-12 13:47:17.345: E/AndroidRuntime(670): FATAL EXCEPTION: main 02-12 13:47:17.345: E/AndroidRuntime(670): java.lang.NullPointerException 02-12 13:47:17.345: E/AndroidRuntime(670): at android.content.ComponentName.(ComponentName.java:75) 02-12 13:47:17.345: E/AndroidRuntime(670): at android.content.Intent.(Intent.java:3122) 02-12 13:47:17.345: E/AndroidRuntime(670): at com.firstadvantage.activities.LogDialog.LinkActivity(LogDialog.java:93) 02-12 13:47:17.345: E/AndroidRuntime(670): at com.firstadvantage.activities.LogDialog$3.onCommandFinished(LogDialog.java:75) 02-12 13:47:17.345: E/AndroidRuntime(670): at com.firstadvantage.buisnesslayer.commands.Command$3.run(Command.java:85) 02-12 13:47:17.345: E/AndroidRuntime(670): at android.os.Handler.handleCallback(Handler.java:605) 02-12 13:47:17.345: E/AndroidRuntime(670): at android.os.Handler.dispatchMessage(Handler.java:92) 02-12 13:47:17.345: E/AndroidRuntime(670): at android.os.Looper.loop(Looper.java:137) 02-12 13:47:17.345: E/AndroidRuntime(670): at android.app.ActivityThread.main(ActivityThread.java:4424) 02-12 13:47:17.345: E/AndroidRuntime(670): at java.lang.reflect.Method.invokeNative(Native Method) 02-12 13:47:17.345: E/AndroidRuntime(670): at java.lang.reflect.Method.invoke(Method.java:511) 02-12 13:47:17.345: E/AndroidRuntime(670): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 02-12 13:47:17.345: E/AndroidRuntime(670): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 02-12 13:47:17.345: E/AndroidRuntime(670): at dalvik.system.NativeStart.main(Native Method)
回答1:
There are two ways to call from Fragment to Activity that hosts the Fragment:
Simply casting to HostActivity
((HostActivity) getActivity()).methodInActivity();
Use interface in Fragment as listener, HostActivity implements the listener:
private SuperListener hostActivity; //In Fragment, define interfce public interface SuperListener{ //for example a confirm dialog void getDialogOk(View dialogView); } //in constructor, get listener instance from HostActivity public YourDialogFragment(SuperListener hostActivity) { this.hostActivity = hostActivity; } //when `Ok` clicked hostActivity.getDialogOk(dialogView);
Hope this is clear.
来源:https://stackoverflow.com/questions/28472531/how-to-call-an-activity-from-a-dialogfragment-in-android