Question

我正在尝试从活动导航到片段，但我遇到了错误。我已经发布了完整的代码。请帮我解决这个问题。欢迎所有建议。请在下面找到我的代码：

EditScreen.java：

public class EditScreen extends ActionBarActivity  {

    Toolbar toolbar;




    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_edit_screen);


        toolbar = (Toolbar) findViewById(R.id.appBar);
        setSupportActionBar(toolbar);

 }

public void update (View view) {

        Intent intent = new Intent(this, DetailViewFragmentActivity.class);
        startActivity(intent);



    }

 }

DetailViewFragment.java：

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;



/**
 * A simple {@link Fragment} subclass.
 */
public class DetailViewFragment extends Fragment {

public DetailViewFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_detail_view, container, false);


    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);


 }

}

DetailViewFragmentActivity.java：

import android.support.v4.app.FragmentActivity;
import android.os.Bundle;



public class DetailViewFragmentActivity extends FragmentActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_detail_view);

        DetailViewFragment f1 = new DetailViewFragment();

        // In case this activity was started with special instructions from an
        // Intent, pass the Intent's extras to the fragment as arguments
        f1.setArguments(getIntent().getExtras());

        getSupportFragmentManager().beginTransaction().add(R.id.fragment_detail, f1).commit();

    }
}

fragment_detail_view.xml：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/fragment_detail"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.ms.t.tms.DetailViewFragment"
    android:background="@color/colorPrimary">

    <include
        android:id="@+id/appBar"
        layout="@layout/app_bar" ></include>
<Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/update"
        android:id="@+id/button"
        android:layout_centerHorizontal="true"

        android:layout_marginTop="20dp"
        android:textColor="@color/textColor"
        android:onClick="update"/>


</RelativeLayout>

LogCat追踪：

02-16 15:08:41.492      965-965/com.ms.t.tms E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.ms.t.tms, PID: 965
    java.lang.IllegalStateException: Could not execute method of the activity
            at android.view.View$1.onClick(View.java:4007)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.lang.reflect.InvocationTargetException
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at android.view.View$1.onClick(View.java:4002)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.ms.t.tms/com.ms.t.tms.DetailViewFragmentActivity}; have you declared this activity in your AndroidManifest.xml?
            at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1761)
            at android.app.Instrumentation.execStartActivity(Instrumentation.java:1485)
            at android.app.Activity.startActivityForResult(Activity.java:3736)
            at android.app.Activity.startActivityForResult(Activity.java:3697)
            at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:817)
            at android.app.Activity.startActivity(Activity.java:4007)
            at android.app.Activity.startActivity(Activity.java:3975)
            at com.ms.t.tms.EditScreen.update(EditScreen.java:65)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at android.view.View$1.onClick(View.java:4002)
            at android.view.View.performClick(View.java:4756)
            at android.view.View$PerformClick.run(View.java:19749)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)

清单文件：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.ms.t.tms" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".EditScreen"
            android:label="@string/title_activity_edit_screen" >
        </activity>
        <activity
            android:name=".DetailViewFragActivity"
            android:label="@string/title_activity_detail_view_frag" >
        </activity>
    </application>

</manifest>

当我从EditScreen中选择Update方法时，我希望导航到详细视图，这是一个片段。当我选择更新按钮时，我收到上面发布的错误。请让我知道我的错误。提前致谢。如果需要更多信息，请告诉我。

Answer 1

你应该改变

  android:name=".DetailViewFragActivity"

到

  android:name=".DetailViewFragmentActivity"

检查活动名称。这是DetailViewFragmentActivity而不是DetailViewFragActivity

无法从“活动”导航到“片段”

1 个答案: