相同活动中的Android两个片段

Question

我知道以下帖子: 在单个活动中使用多个片段

我正在寻找的是具体问题的具体答案.以下代码的结果是一个空白的FragmentActivity.我在下面的代码中缺少什么来让它呈现一个包含两个片段的活动.一个是空列表片段,另一个是包含输入框和水平布局按钮的片段(此布局可以在http://developer.android.com/training/basics/firstapp/starting-找到 - activity.html)我希望绝对放在屏幕底部,固定高度约为25度.

的Manifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.my.package"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.my.package.Application"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

我的主要活动及其关联的application.xml文件.

package com.my.package;

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

public class Application  
extends FragmentActivity 
implements MessageListViewFragment.OnLineSelectedListener, 
SendMessageFragment.OnSendButtonPressed {

    MessageListViewFragment mMessageListFragment;
    SendMessageFragment mSendMessageFragment;

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

        mMessageListFragment = new MessageListViewFragment();
        mSendMessageFragment = new SendMessageFragment();

        FragmentTransaction transaction = 
                getSupportFragmentManager().beginTransaction();

        transaction.add(R.id.message_fragment, mMessageListFragment);
        transaction.add(R.id.send_fragment, mSendMessageFragment);

        transaction.commit();
    }

    @Override
    public void onListItemSelected(int position) {
        // TODO Auto-generated method stub

    }

    @Override
    public void onSendButtonPressed() {
        // TODO Auto-generated method stub

    }
}

布局:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:baselineAligned="false"
    android:orientation="vertical" >

    <fragment
        android:id="@+id/message_fragment"
        android:name="com.example.android.fragments.MessageListViewFragment"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="top" />

    <fragment
        android:id="@+id/send_fragment"
        android:name="com.example.android.fragments.SendMessageFragment"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="bottom" />

</LinearLayout>

现在为两个片段及其相关的xml文件:First Fragment(顶部列表片段)

package com.my.package;

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

public class MessageListViewFragment extends ListFragment {
    OnLineSelectedListener mCallback;

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        // This makes sure that the container activity has implemented
        // the callback interface. If not, it throws an exception
        try {
            mCallback = (OnLineSelectedListener)activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnLineSelectedListener");
        }
    }

    // Container Activity must implement this interface
    public interface OnLineSelectedListener {
        public void onListItemSelected(int position);
    }

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

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

        return inflater.inflate(R.layout.list_fragment, null);
    }
}

布局:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/fragment_container"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

第二个片段(在底部)

package com.my.package;

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

public class SendMessageFragment extends Fragment {
    OnSendButtonPressed mCallback;

    // Container Activity must implement this interface
    public interface OnSendButtonPressed {
        public void onSendButtonPressed();
    }

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

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

        return inflater.inflate(R.layout.input_fragment, null);
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        // This makes sure that the container activity has implemented
        // the callback interface. If not, it throws an exception
        try {
            mCallback = (OnSendButtonPressed)activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement OnHeadlineSelectedListener");
        }
    }
}

布局:

<LinearLayout 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:orientation="horizontal">
    <EditText android:id="@+id/edit_message"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:hint="@string/edit_message" />
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/button_send" />
</LinearLayout>

Answer 1

请执行下列操作:

1. 更改Fragment到FrameLayout主活动XML兼而有之.
2. 改变layout_width从fill_parent到match_parent,对于FrameLayout主XML文件中,(在步骤1中创建的).
3. 改变layout_height从fill_parent到wrap_content,对于FrameLayout主XML文件中,(在步骤1中创建的).
4. 更改FrameLayout为ListViewList Fragment XML,因为它是List.
5. 将此ID更改LisView为@android:id/list,因为它是必需的ListFragment.

然后让我知道,干杯.

编辑,也是这些:

1. 更改return inflater.inflate(R.layout.list_fragment, null);到return inflater.inflate(R.layout.list_fragment, container, false);.
2. 更改return inflater.inflate(R.layout.input_fragment, null);到return inflater.inflate(R.layout.input_fragment, container, false);

编辑:

制作您的主要活动XML文件,如下所示:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <FrameLayout
        android:id="@+id/message_fragment"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <FrameLayout
        android:id="@+id/send_fragment"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true" />

</RelativeLayout>

我拿出了android:name"..."因为我不知道它是什么,也不知道它是什么,如果你知道它确实是什么,只需加回去,应该没问题.