从一个活动链接到一个片段活动使用actionBarSherlock按钮 [英] Linking from an activity to a fragment activity with a button using actionBarSherlock

问题描述

我做了一个项目，其中当您从在MainActivity点击一个按钮，它会导致一个片段的活动。但我似乎无法使它工作。

I made a project wherein when you click a button from the MainActivity, it will lead to a fragment activity. But I can't seem to make it work.

下面是我的code的在MainActivity按钮的一个片段：

Here's a snippet of my code for the button in MainActivity:

Button button2 = (Button) findViewById(R.id.button2);
    button2.setOnClickListener(new OnClickListener () {

        public void onClick(View v) {

            Intent intent = new Intent (v.getContext(), page3.class);
            startActivityForResult(intent, 0);
        }
    }) ;

这是我的第3页片段，其中从MainActivity按钮导致：

Here's my snippet for page3 where the button from MainActivity leads to:

package com.example.pixelapp3;

import android.os.Bundle;
import android.support.v4.view.ViewPager;
import com.actionbarsherlock.app.ActionBar;
import com.actionbarsherlock.app.SherlockFragmentActivity;

public class page3 extends SherlockFragmentActivity {

private ViewPager mViewPager;
private TabsAdapter mTabsAdapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    mViewPager = new ViewPager(this);
    mViewPager.setId(R.id.pager);
    setContentView(mViewPager);

    final ActionBar bar = getSupportActionBar();
    bar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

    mTabsAdapter = new TabsAdapter(this, mViewPager);
    mTabsAdapter.addTab(bar.newTab().setText("Fragment 1"), page3a.class, null);
    mTabsAdapter.addTab(bar.newTab().setText("Fragment 2"), page3b.class, null);
    mTabsAdapter.addTab(bar.newTab().setText("Fragment 3"), page3c.class, null);
    mTabsAdapter.addTab(bar.newTab().setText("Fragment 4"), page3d.class, null);
}

}

这里的page3.xml片段：

Here's the page3.xml snippet:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".mainActivity" >

<android.support.v4.view.ViewPager
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/pager"/>

</RelativeLayout>

下面是page3a.java：

Here's page3a.java:

package com.example.pixelapp3;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.actionbarsherlock.app.SherlockFragmentActivity;


public class page3a extends SherlockFragmentActivity {

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
    return inflater.inflate(R.layout.page3a, null);
}

}

这里是logcat的，当我点击不起作用的按钮：

Here's the logCat when I click the button that doesn't work:

  06-04 10:46:14.871: I/ActionBarSherlock(907): Registering ActionBarSherlockCompat with qualifier @com.actionbarsherlock.ActionBarSherlock$Implementation(api=7, dpi=-1)
06-04 10:46:14.871: I/ActionBarSherlock(907): Registering ActionBarSherlockNative with qualifier @com.actionbarsherlock.ActionBarSherlock$Implementation(api=14, dpi=-1)
06-04 10:46:14.971: I/ActionBarSherlock(907): Using implementation: ActionBarSherlockNative
06-04 10:46:14.971: D/ActionBarSherlock(907): [<ctor>] activity: com.example.pixelapp3.page3@41219338, flags: 1
06-04 10:46:14.971: D/ActionBarSherlock(907): [setContentView] view: android.support.v4.view.ViewPager@4121c920
06-04 10:46:14.971: D/ActionBarSherlock(907): [setContentView] view: android.support.v4.view.ViewPager@4121c920, params: android.view.ViewGroup$LayoutParams@4122b4f0
06-04 10:46:15.212: D/ActionBarSherlock(907): [getActionBar]
06-04 10:46:15.222: D/ActionBarSherlock(907): [getActionBar]
06-04 10:46:15.361: V/21st Polling:(907): clicked
06-04 10:46:15.671: D/dalvikvm(907): GC_CONCURRENT freed 178K, 4% free 8234K/8519K, paused 74ms+88ms, total 260ms
06-04 10:46:15.671: D/AndroidRuntime(907): Shutting down VM
06-04 10:46:15.681: W/dalvikvm(907): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
06-04 10:46:15.761: E/AndroidRuntime(907): FATAL EXCEPTION: main
06-04 10:46:15.761: E/AndroidRuntime(907): java.lang.ClassCastException: com.example.pixelapp3.page3a cannot be cast to android.support.v4.app.Fragment
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.support.v4.app.Fragment.instantiate(Fragment.java:394)
06-04 10:46:15.761: E/AndroidRuntime(907):  at com.example.pixelapp3.TabsAdapter.getItem(TabsAdapter.java:97)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.support.v4.app.FragmentPagerAdapter.instantiateItem(FragmentPagerAdapter.java:97)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.support.v4.view.ViewPager.addNewItem(ViewPager.java:829)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.support.v4.view.ViewPager.populate(ViewPager.java:979)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.support.v4.view.ViewPager.populate(ViewPager.java:911)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1432)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.View.measure(View.java:15172)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.View.measure(View.java:15172)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:833)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:574)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.View.measure(View.java:15172)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4816)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
06-04 10:46:15.761: E/AndroidRuntime(907):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2148)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.View.measure(View.java:15172)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1850)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1102)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1275)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1000)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4214)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.Choreographer.doCallbacks(Choreographer.java:555)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.Choreographer.doFrame(Choreographer.java:525)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.os.Handler.handleCallback(Handler.java:615)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.os.Handler.dispatchMessage(Handler.java:92)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.os.Looper.loop(Looper.java:137)
06-04 10:46:15.761: E/AndroidRuntime(907):  at android.app.ActivityThread.main(ActivityThread.java:4745)
06-04 10:46:15.761: E/AndroidRuntime(907):  at java.lang.reflect.Method.invokeNative(Native Method)
06-04 10:46:15.761: E/AndroidRuntime(907):  at java.lang.reflect.Method.invoke(Method.java:511)
06-04 10:46:15.761: E/AndroidRuntime(907):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
06-04 10:46:15.761: E/AndroidRuntime(907):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
06-04 10:46:15.761: E/AndroidRuntime(907):  at dalvik.system.NativeStart.main(Native Method)

这里是在MainActivity

这里的第3页（包括page3a到page3d片段

我已经在这里停留几天。任何类型的帮助是AP preciated。在此先感谢！

I've been stuck here for days. Any type of help is appreciated. Thanks in advance!

推荐答案

有趣的（给你）的部分是什么如下致命异常

The interesting (to you) part is what follows FATAL EXCEPTION

您似乎建立ViewPager并在这个过程中，你正在试图投类型的对象某个时刻 com.example.pixelapp3.page3a 来一个片段类。作为对象的是不是一个片段，它被抛出异常。

You appear to be setting up a ViewPager and at some point in this process you are trying to cast an object of type com.example.pixelapp3.page3a to a Fragment class. As the object is not a fragment, it is throwing an exception.

这是像我一样可以从C您提供的$ C $诉说。

That is as much as I can tell from the code you provided.

我会尝试让简单的东西尝试与问题复杂化的标签前的工作和ViewPager的

I would try to get the simple stuff working before attempting to complicate matters with tabs and ViewPager's

这篇关于从一个活动链接到一个片段活动使用actionBarSherlock按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！