從片段到活動的意圖

Question

我試圖使用button轉到另一個頁面，但它總是失敗。

這是我的頭等艙及其 XML：

public class FindPeopleFragment extends Fragment {
    public FindPeopleFragment(){}

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.fragment_home, container, false);
        return rootView;
    }

    public void goToAttract(View v)
    {
        Intent intent = new Intent(getActivity().getApplication(), MainActivityList.class);
        startActivity(intent);
    }
}

這是我的 XML：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerHorizontal="true"
    android:layout_centerInParent="true"
    android:layout_marginBottom="48dp"
    android:onClick="goToAttract"
    android:text="Button" /></RelativeLayout>

這是我的堆棧跟蹤..這是我使用 onclicklistener 時的結果

12-30 16:54:28.006: E/AndroidRuntime(992): FATAL EXCEPTION: main
12-30 16:54:28.006: E/AndroidRuntime(992): java.lang.RuntimeException: Unable to start activity ComponentInfo{info.androidhive.slidingmenu/info.androidhive.slidingmenu.MainActivityList}: android.view.InflateException: Binary XML file line #7: Error inflating class <unknown>
12-30 16:54:28.006: E/AndroidRuntime(992):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1955)
12-30 16:54:28.006: E/AndroidRuntime(992):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980)
12-30 16:54:28.006: E/AndroidRuntime(992):  at android.app.ActivityThread.access$600(ActivityThread.java:122)
12-30 16:54:28.006: E/AndroidRuntime(992):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146)
12-30 16:54:28.006: E/AndroidRuntime(992):  at android.os.Handler.dispatchMessage(Handler.java:99)
12-30 16:54:28.006: E/AndroidRuntime(992):  at android.os.Looper.loop(Looper.java:137)
12-30 16:54:28.006: E/AndroidRuntime(992):  at android.app.ActivityThread.main(ActivityThread.java:4340)
12-30 16:54:28.006: E/AndroidRuntime(992):  at java.lang.reflect.Method.invokeNative(Native Method)
12-30 16:54:28.006: E/AndroidRuntime(992):  at java.lang.reflect.Method.invoke(Method.java:511)
12-30 16:54:28.006: E/AndroidRuntime(992):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
12-30 16:54:28.006: E/AndroidRuntime(992):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
12-30 16:54:28.006: E/AndroidRuntime(992):  at dalvik.system.NativeStart.main(Native Method)
12-30 16:54:28.006: E/AndroidRuntime(992): Caused by: android.view.InflateException: Binary XML file line #7: Error inflating class <unknown>
12-30 16:54:28.006: E/AndroidRuntime(992):  at android.view.LayoutInflater.createView(LayoutInflater.java:606)
12-30 16:54:28.006: E/AndroidRuntime(992):  at com.android.internal.policy.impl.PhoneLayoutInflater.onCreateView(PhoneLayoutInflater.java:56)
12-30 16:54:28.006: E/AndroidRuntime(992):  at android.view.LayoutInflater.onCreateView(LayoutInflater.java:653)
12-30 16:54:28.006: E/AndroidRuntime(992):  at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:678)
12-30 16:54:28.006: E/AndroidRuntime(992):  at android.view.LayoutInflater.rInflate(LayoutInflater.java:

Answer 1

用這個

public void goToAttract(View v)
{
    Intent intent = new Intent(getActivity(), MainActivityList.class);
    startActivity(intent);
}

確保您已經在 Manifest 中注冊了MainActivityList

Answer 2

試試這個代碼一次 -

public class FindPeopleFragment extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {
    View rootView = inflater.inflate(R.layout.fragment_home,
        container, false);
        Button button = (Button) rootView.findViewById(R.id.button1);
        button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
        updateDetail();
        }
        });
        return rootView;
        }

public void updateDetail() {
        Intent intent = new Intent(getActivity(), MainActivityList.class);
        startActivity(intent);
        }
}

根據 Raghunandan 的建議，從您的fragment_home.xml刪除以下代碼 -

android:onClick="goToAttract"

Answer 3

刪除這個

android:onClick="goToAttract"

然后

View rootView = inflater.inflate(R.layout.fragment_home, container, false);
Button b = (Button)rootView.findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener()
{
     public void onClick(View v)
     {
        Intent intent = new Intent(getActivity(), MainActivityList.class);
        startActivity(intent);

     } 

});
return rootView;

該錯誤表示您需要在 Activity 類中public void goToAttract(View v)

Could not find method goToAttract(View) in the activity class

原因請檢查 PareshMayani @ 的答案

Android 應用程序崩潰（片段和 xml onclick）

編輯：

Caused by: java.lang.OutOfMemoryError

我猜您的圖像太大而無法放入，需要按比例縮小。 因此出現了OutOfMemoryError 。

Answer 4

在您的接收意圖中用作

Intent intent = getActivity().getIntent();
        ((TextView)view.findViewById(R.id.hello)).setText(intent.getStringExtra("Hello"));

並在您的發送意圖中

Intent intent = new Intent(getActivity(),Main2Activity.class);
        intent.putExtra("Hello","Nisar");
        getActivity().startActivity(intent);

記住兩者都是碎片

Answer 5

使用getContext()而不是 MainActivity.this

Intent intent = new Intent(getContext(), SecondActivity.class);
startActivity(start);

Answer 6

希望此代碼會有所幫助

public class ThisFragment extends Fragment {

public Button button = null;
Intent intent;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.yourlayout, container, false);

    intent = new Intent(getActivity(), GoToThisActivity.class);
    button = (Button) rootView.findViewById(R.id.theButtonid);
    button.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            startActivity(intent);
        }
    });
    return rootView;
}

您可以使用此代碼，確保將“ ThisFragment ”更改為您的片段名稱，“ yourlayout ”作為布局名稱，“ GoToThisActivity ”將其更改為您想要的活動，然后“ theButtonid ”將其更改為您使用的按鈕ID .

Answer 7

您需要將片段中的 getActivity() 方法用於 Intent。

Intent intent = new Intent(getActivity(), SecondActivity.class);
startActivity(intent);

Answer 8

 FragmentManager fragmentManager =  getFragmentManager();
 fragmentManager.beginTransaction().replace(R.id.frame, new MySchedule()).commit();

MySchedule 是我的 java 類的名稱。

Answer 9

對於 Kotlin，您可以使用

val myIntent = Intent(activity, your_destination_activity::class.java)
startActivity(myIntent)

Answer 10

如果您可以在該片段中獲得一個View ，則可以從那里訪問上下文：

view.getContext().startActivity(intent);

Answer 11

public class OneWayFragment extends Fragment {

    ImageView img_search;


public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {


        View view = inflater.inflate(R.layout.one_way_fragment, container, false);
        img_search = (ImageView) view.findViewById(R.id.search);


        img_search.setOnClickListener(new View.OnClickListener() {
            @Override`enter code here`
            public void onClick(View v) {
                Intent displayFlights = new Intent(getActivity(), SelectFlight.class);
                startActivity(displayFlights);
            }
        });

Answer 12

您可以使用以下任何一種：

Intent i = new Intent(getActivity().getApplication(),SecondActivity.class);

或

Intent i = new Intent(getActivity(),SecondActivity.class);