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我正在尝试使用具有两种不同布局的片段开发一个应用程序，类似于这个：

在此处输入图像描述

在此处输入图像描述

当我在手机上运行我的应用程序时，它会立即崩溃。这是我的代码：

/layout
activity_titles_fragment.xml
details_fragment.xml
/layout-land
activity_titles_fragment.xml

/sec
DetailsActivity.java
DetailsFragment.java
TitlesFragment.java


activity_titles_fragment.xml

<FrameLayout 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=".TitlesFragment" >

<fragment
    class="com.example.fragmentsapp.TitlesFragment"
    android:id="@+id/titles"
    android:layout_height="match_parent"
    android:layout_width="match_parent" />
</FrameLayout>



details_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >

<TextView
    android:id="@+id/details"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

</FrameLayout>



对于景观，activity_titles_fragment.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >

<fragment
    class="com.example.fragmentsapp.TitlesFragment"
    android:id="@+id/titles"
    android:layout_height="match_parent"
    android:layout_width="0px"
    android:layout_weight="1" />

<FrameLayout
    android:id="@+id/details"
    android:layout_height="match_parent"
    android:layout_width="0px"
    android:layout_weight="1" />

</LinearLayout>



详细信息Activity.java

package com.example.fragmentsapp;

import android.content.res.Configuration;
import android.os.Bundle;
import android.support.v4.app.FragmentActivity;

public class DetailsActivity extends FragmentActivity{

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

    if (getResources().getConfiguration().orientation
            == Configuration.ORIENTATION_LANDSCAPE) {
        // If the screen is now in landscape mode, we can show the
        // dialog in-line so we don't need this activity.
        finish();
        return;
    }

    if (savedInstanceState == null) {
        // During initial setup, plug in the details fragment.
        DetailsFragment details = new DetailsFragment();
        details.setArguments(getIntent().getExtras());
        getFragmentManager().beginTransaction().add(
                R.id.details, details).commit();
    }
}

}



详细信息Fragment.java

package com.example.fragmentsapp;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

public class DetailsFragment extends Fragment {

public  static DetailsFragment newInstance(int index)
{
    // supply input index as argument
    DetailsFragment f = new DetailsFragment();
    Bundle args = new Bundle();
    args.putInt("index", index);
    f.setArguments(args);

    return f;

}

public int getShownIndex()
{
    return getArguments().getInt("index", 0);
}

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

    if(container == null)
        return null;

    TextView text = new TextView(getActivity());
    text.setText("Fragment number: " + getShownIndex());

    return text;
}

}



TitlesFragment.java

package com.example.fragmentsapp;

import android.app.FragmentTransaction;
import android.app.ListFragment;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

public class TitlesFragment extends ListFragment {

boolean mDualPane;
int mCurCheckPosition = 0;

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

    // populate list items with list view
    setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1,
            getResources().getStringArray(R.array.titles)));

    // check for mobile dual pane
    View detailsFrame = getActivity().findViewById(R.id.details);
    mDualPane = detailsFrame != null && detailsFrame.getVisibility() == View.VISIBLE;

    if (savedInstanceState != null)
    {
        mCurCheckPosition = savedInstanceState.getInt("curChoice",0);
    }

    if (mDualPane)
    {
        showDetails(mCurCheckPosition);
    } 

}



@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    showDetails(position);
}



@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putInt("curChoice", mCurCheckPosition);
}



private void showDetails(int index) {
    mCurCheckPosition = index;

    if(mDualPane)
    {

        DetailsFragment details = (DetailsFragment) getFragmentManager().findFragmentById(R.id.details);

        if(details == null || details.getShownIndex() != index)
        {
            details = DetailsFragment.newInstance(index);
            FragmentTransaction ft = getFragmentManager().beginTransaction();
            ft.replace(R.id.details, details);
            ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
            ft.commit();
        }

    } else {
        Intent intent = new Intent();
        intent.setClass(getActivity(), DetailsActivity.class);
        intent.putExtra("index", index);
        startActivity(intent);
    }
}

}
4

1 回答 1

0

您是否在 Android 中声明了所有活动？你没有忘记这个吗？

<activity android:name=".activities.FragmentLayout$DetailsActivity">
</activity>

此外，每次遇到此类错误时，您都应该添加一个堆栈跟踪。

于 2013-12-09T10:11:27.130 回答