如何从 android 中的 Dialogfragment 调用 activity？

Question

我想从 Dialogfragment 中调用一个 activity，我附上了代码，下面 logcat 供您参考我所拥有的内容 tried.Kindly 向我提供您的知识。谢谢。

 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.onCommandFinished(LogDialog.java:75) 02-12 13:47:17.345: E/AndroidRuntime(670): at com.firstadvantage.buisnesslayer.commands.Command.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)

Answer 1

有两种方法可以从 Fragment 调用托管 Fragment 的 Activity：

简单地投射到主机Activity

((HostActivity) getActivity()).methodInActivity();

使用Fragment中的接口作为监听器，HostActivity实现监听器：

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);

希望这是清楚的。

如何从 android 中的 Dialogfragment 调用 activity？

How to call an activity from a Dialogfragment in android?

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