Android的两个片段在同一个活动 [英] Android Two Fragments in Same Activity

问题描述

我知道以下职位： <一href="http://stackoverflow.com/questions/4949216/using-multiple-fragments-in-an-single-activity">Using在一个活动的多个片段

我在找的是一个明确的答案，以一个具体的问题。以下code的结果是一个空白FragmentActivity。我是什么在我的下面code缺失得到它呈现的活动有两个片段。一个是空列表片段，另一种是它包含一个输入框，并在一个水平布局的一个按钮，一个片段（这种布局可以在<一个中找到href="http://developer.android.com/training/basics/firstapp/starting-activity.html">http://developer.android.com/training/basics/firstapp/starting-activity.html)我想绝对放置在屏幕的底部为约25浸一个固定的高度。

的Manifest.xml

 ＆LT; XML版本=1.0编码=UTF-8＆GT？;
＆LT;舱单的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    包=com.my.package
    安卓版code =1
    机器人：VERSIONNAME =1.0＆GT;

    ＆LT;用途-SDK
        安卓的minSdkVersion =8
        机器人：targetSdkVersion =17/＆GT;

    ＆lt;应用
        机器人：allowBackup =真
        机器人：图标=@可绘制/ ic_launcher
        机器人：标签=@字符串/ APP_NAME
        机器人：主题=@风格/ AppTheme＆GT;
        ＆LT;活动
            机器人：名称=com.my.package.Application
            机器人：标签=@字符串/ APP_NAME＆GT;
            ＆LT;意向滤光器＆gt;
                ＆lt;作用机器人：名称=android.intent.action.MAIN/＆GT;

                ＆LT;类机器人：名称=android.intent.category.LAUNCHER/＆GT;
            ＆所述; /意图滤光器＆gt;
        ＆LT; /活性GT;
    ＆LT; /用途＆gt;

＆LT; /舱单＆GT;
 

我的主要活动及其关联的application.xml文件。

 包com.my.package;

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

公共类应用
扩展FragmentActivity
实现MessageListViewFragment.OnLineSelectedListener，
SendMessageFragment.OnSendButton pressed {

    MessageListViewFragment mMessageListFragment;
    SendMessageFragment mSendMessageFragment;

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        的setContentView（R.layout.application）;

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

        FragmentTransaction交易=
                。getSupportFragmentManager（）的BeginTransaction（）;

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

        器transaction.commit（）;
    }

    @覆盖
    公共无效onListItemSelected（INT位置）{
        // TODO自动生成方法存根

    }

    @覆盖
    公共无效onSendButton pressed（）{
        // TODO自动生成方法存根

    }
}
 

布局：

 ＆LT; LinearLayout中的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    机器人：layout_width =match_parent
    机器人：layout_height =match_parent
    机器人：baselineAligned =假
    机器人：方向=垂直＆GT;

    ＆LT;片段
        机器人：ID =@ + ID / message_fragment
        机器人：名称=com.example.android.fragments.MessageListViewFragment
        机器人：layout_width =FILL_PARENT
        机器人：layout_height =FILL_PARENT
        机器人：重力=顶/＆GT;

    ＆LT;片段
        机器人：ID =@ + ID / send_fragment
        机器人：名称=com.example.android.fragments.SendMessageFragment
        机器人：layout_width =FILL_PARENT
        机器人：layout_height =FILL_PARENT
        机器人：重力=底部/＆GT;

＆LT; / LinearLayout中＆GT;
 

和现在的两个片段及其相关的XML文件： 第一块碎片（名单片段顶部）

 包com.my.package;

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

公共类MessageListViewFragment扩展ListFragment {
    OnLineSelectedListener mCallback;

    @覆盖
    公共无效onAttach（活动活动）{
        super.onAttach（活动）;

        //这将确保集装箱活动已实施
        //回调接口。如果不是，它抛出一个异常
        尝试 {
            mCallback =（OnLineSelectedListener）的活动;
        }赶上（ClassCastException异常E）{
            抛出新ClassCastException异常（activity.toString（）
                    +必须实现OnLineSelectedListener）;
        }
    }

    //集装箱活动必须实现此接口
    公共接口OnLineSelectedListener {
        公共无效onListItemSelected（INT位）;
    }

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
    }

    @覆盖
    公共查看onCreateView（LayoutInflater充气，
            ViewGroup中的容器，包savedInstanceState）{

        返回inflater.inflate（R.layout.list_fragment，NULL）;
    }
}
 

布局：

 ＆LT;的FrameLayout的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    机器人：ID =@ + ID / fragment_container
    机器人：layout_width =match_parent
    机器人：layout_height =match_parent/＆GT;
 

第二个片段（底部）

 包com.my.package;

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

公共类SendMessageFragment扩展片段{
    OnSendButton pressed mCallback;

    //集装箱活动必须实现此接口
    公共接口OnSendButton pressed {
        公共无效onSendButton pressed（）;
    }

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
    }

    @覆盖
    公共查看onCreateView（LayoutInflater充气，
            ViewGroup中的容器，包savedInstanceState）{

        返回inflater.inflate（R.layout.input_fragment，NULL）;
    }

    @覆盖
    公共无效onAttach（活动活动）{
        super.onAttach（活动）;

        //这将确保集装箱活动已实施
        //回调接口。如果不是，它抛出一个异常
        尝试 {
            mCallback =（OnSendButton pressed）的活动;
        }赶上（ClassCastException异常E）{
            抛出新ClassCastException异常（activity.toString（）
                    +必须实现OnHeadlineSelectedListener）;
        }
    }
}
 

布局：

 ＆LT; LinearLayout中的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    的xmlns：工具=htt​​p://schemas.android.com/tool​​s
    机器人：layout_width =match_parent
    机器人：layout_height =match_parent
    机器人：方向=横向＆GT;
    ＆LT; EditText上机器人：ID =@ + ID / edit_message
        机器人：layout_weight =1
        机器人：layout_width =0dp
        机器人：layout_height =WRAP_CONTENT
        机器人：提示=@字符串/ edit_message/＆GT;
    ＆LT;按钮
        机器人：layout_width =WRAP_CONTENT
        机器人：layout_height =WRAP_CONTENT
        机器人：文本=@字符串/ button_send/＆GT;
＆LT; / LinearLayout中＆GT;
 

解决方案

执行以下操作：

1. 修改片段到的FrameLayout 中的主要活动XML，这两个。
2. 修改 layout_width 从 FILL_PARENT 到 match_parent ，为无论的FrameLayout 主要XML文件中，（在步骤1中创建的）。
3. 修改 layout_height 从 FILL_PARENT 到 WRAP_CONTENT ，为无论的FrameLayout 主要XML文件中，（在步骤1中创建的）。
4. 修改的FrameLayout 到的ListView 在列表片段XML，因为它是一个列表。
5. 在这个变革的ID LisView 到 @android：ID /列表，因为它是需要的 ListFragment 。

然后让我知道，干杯。

编辑，也是这些：

1. 修改返回inflater.inflate（R.layout.list_fragment，NULL）; 到返回inflater.inflate（R.layout.list_fragment，集装箱，假）;
2. 修改返回inflater.inflate（R.layout.input_fragment，NULL）; 到返回inflater.inflate（R.layout.input_fragment，集装箱，假）;

编辑：

请您的主要活动的XML文件是这样的：

 ＆LT; RelativeLayout的的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    机器人：layout_width =match_parent
    机器人：layout_height =match_parent＆GT;

    ＆LT;的FrameLayout
        机器人：ID =@ + ID / message_fragment
        机器人：layout_width =match_parent
        机器人：layout_height =WRAP_CONTENT/＆GT;

    ＆LT;的FrameLayout
        机器人：ID =@ + ID / send_fragment
        机器人：layout_width =match_parent
        机器人：layout_height =WRAP_CONTENT
        机器人：layout_alignParentBottom =真/＆GT;

＆LT; / RelativeLayout的＆GT;
 

我拿出安卓名...，因为我不知道那是什么，也没有能够找出它是什么，如果你知道什么它是肯定的，只是添加回去，应该没问题。

I am aware of the following post: Using Multiple Fragments in an single activity

What I am looking for is a specific answer to a specific problem. The result of the following code is a blank FragmentActivity. What am I missing in my following code to get it to render an activity with two fragments. One is a empty list fragment, the other is a fragment which contains a input box and a button in a horizontal layout, (this layout can be found at http://developer.android.com/training/basics/firstapp/starting-activity.html) that I want to be placed absolutely at the bottom of the screen with a fixed height of about 25 dip.

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>

My main activity and its associated application.xml file.

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

    }
}

Layout:

<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>

And now for the two fragments and their associated xml files: First Fragment (list fragment at top)

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);
    }
}

Layout:

<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" />

second fragment (at bottom)

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");
        }
    }
}

Layout:

<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>

解决方案

Do the following:

1. Change Fragment to FrameLayout in the main activity XML, for both.
2. Change layout_width from fill_parent to match_parent, for both FrameLayout in the main XML file, (ones created in step 1).
3. Change layout_height from fill_parent to wrap_content, for both FrameLayout in the main XML file, (ones created in step 1).
4. Change FrameLayout to ListView in the List Fragment XML because it is a List.
5. Change the id of this LisView to @android:id/list, because it is needed for the ListFragment.

Then let me know, Cheers.

Edit, also these:

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

Edit:

Make your main activity XML file like this:

<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>

I took out the android:name"..." because I don't know what that is nor able to find out what it is, if you know what it does for sure, just add it back, should be okay.

这篇关于Android的两个片段在同一个活动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！