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无法替代/导航片段

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问题描述

限时删除！！

我是一个从一个片段到另一个片段的tryng。这两个片段是100％不同的，有否 ViewPager 或类似的东西来连接它们。这是代码。



fragment_view1.xml 

 <？xml version =1.0encoding =utf-8？> 
< RelativeLayout xmlns：android =http://schemas.android.com/apk/res/android
 android：layout_width =match_parent
 android：layout_height =match_parent 
 android：orientation =vertical
 android：id =@ + id / firstView> 
 
< TextView 
 android：id =@ + id / viewOneText
 android：layout_width =wrap_content
 android：layout_height =wrap_content
 android：layout_alignParentLeft =true
 android：layout_alignParentTop =true
 android：layout_marginLeft =92dp
 android：layout_marginTop =182dp
 android：text = 第一视图
 android：textAppearance =？android：attr / textAppearanceLarge/> 
 
< Button 
 android：id =@ + id / viewOneBtn
 style =？android：attr / buttonStyleSmall
 android：layout_width =wrap_content 
 android：layout_height =wrap_content
 android：layout_alignRight =@ + id / viewOneText
 android：layout_below =@ + id / viewOneText
 android：layout_marginTop = 17dp
 android：text =点击这里/> 
 
< include layout =@ layout / drop_down
 android：layout_width =fill_parent
 android：layout_height =wrap_content
 android：layout_marginTop = 15dp
 android：layout_alignParentBottom =true/> 
 
 
< FrameLayout 
 android：id =@ + id / fragment_view
 android：layout_width =match_parent
 android：layout_height = match_parent/> 
< / RelativeLayout>

custom_view.xml 

 <？xml version =1.0encoding =utf-8？> 
< RelativeLayout xmlns：android =http://schemas.android.com/apk/res/android
 android：layout_width =match_parent
 android：layout_height =match_parent 
 android：orientation =vertical
 android：id =@ + id / customFragment> 
 
< TextView 
 android：id =@ + id / textView1
 android：layout_width =wrap_content
 android：layout_height =wrap_content
 android：layout_alignParentTop =true
 android：layout_centerHorizo​​ntal =true
 android：layout_marginTop =174dp
 android：text =自定义片段
 android：textAppearance =？android：attr / textAppearanceLarge/> 
 
< / RelativeLayout>

FirstView.java （使用fragment_view1.xml）

  package com.example.fragmenttest; 
 
 import android.content.Intent; 
 import android.os.Bundle; 
 import android.support.v4.app.Fragment; 
 import android.support.v4.app.FragmentManager; 
 import android.support.v4.app.FragmentTransaction; 
 import android.view.LayoutInflater; 
 import android.view.View; 
 import android.view.View.OnClickListener; 
 import android.view.ViewGroup; 
 import android.widget.Button; 
 import android.widget.TextView; 
 
 public class FirstView extends DropDownMenu 
 {
 private TextView firstText; 
私人按钮btn; 
 
 public View onCreateView（LayoutInflater inflater，ViewGroup容器，Bundle savedInstanceState）
 {
 
 
查看视图= inflater.inflate（R.layout.fragment_view1 ，容器，FALSE）; 
 
 
 firstText =（TextView）view.findViewById（R.id.viewOneText）; 
 btn =（Button）view.findViewById（R.id.viewOneBtn）; 
 
 btn.setOnClickListener（new ButtonEvent（））; 
返回视图; 
 
} 
 
私有类ButtonEvent实现OnClickListener 
 {
 
 @Override 
 public void onClick（View v）
 {
 //创建新的片段和事务
片段newFragment = new CustomView（）; 
 FragmentTransaction transaction = getFragmentManager（）。beginTransaction（）; 
 
 //使用此片段替换fragment_container视图中的任何内容，
 //并将事务添加到后端栈
 transaction.replace（R.id.fragment_view，newFragment ）; 
 transaction.addToBackStack（null）; 
 
 //提交事务
 transaction.commit（）; 
} 
 
} 
 
 
}

CustomView.java（使用custom_view.xml）

  package com.example.fragmenttest; 
 
 import android.os.Bundle; 
 import android.support.v4.app.Fragment; 
 import android.view.LayoutInflater; 
 import android.view.View; 
 import android.view.View.OnClickListener; 
 import android.view.ViewGroup; 
 import android.widget.Button; 
 import android.widget.TextView; 
 
 public class CustomView extends Fragment 
 {
 private TextView secondText; 
 private Button secondViewBtn; 
 
 public View onCreateView（LayoutInflater inflater，ViewGroup容器，Bundle savedInstanceState）
 {
查看视图= inflater.inflate（R.layout.custom_view，container，false）; 
 
返回视图; 
 
} 
 
 
}

在 FirstView.java 中，当我点击按钮时，我需要移动到片段 CustomView 。而是移动，它只是替换 CustomView 中 FirstView 之上的所有内容。



FirstView 单独





CustomView 单独





当按钮为 FirstView 点击





为什么这样发生？请帮助

解决方案

您正在尝试用新片段替换 firstView ，但 firstView 不是一个片段，它的一个 RelativeLayout 。



您不能替换布局文件中静态定义的片段。您只能替换您通过 FragmentTransaction 动态添加的片段。



您的布局中没有包含

 < fragment 
 android：id =@ + id / fragment1
 android：layout_width =march_parent
 android：layout_height =match_parent>< / fragment>

新的片段将替换之前添加到容器的现有片段。



查看。


I am tryng to navigate from one fragment to another. These 2 fragments are 100% different, there is no ViewPager or something like that to connect them. Here is the code.

fragment_view1.xml

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

    <TextView
        android:id="@+id/viewOneText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="92dp"
        android:layout_marginTop="182dp"
        android:text="First View"
        android:textAppearance="?android:attr/textAppearanceLarge" />

    <Button
        android:id="@+id/viewOneBtn"
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/viewOneText"
        android:layout_below="@+id/viewOneText"
        android:layout_marginTop="17dp"
        android:text="Click Here" />

  <include layout = "@layout/drop_down"
            android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:layout_alignParentBottom="true"/>


   <FrameLayout
                android:id="@+id/fragment_view"
                android:layout_width="match_parent"
                android:layout_height="match_parent" />
</RelativeLayout>

custom_view.xml

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

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="174dp"
        android:text="Custom Fragment"
        android:textAppearance="?android:attr/textAppearanceLarge" />

</RelativeLayout>

FirstView.java (uses fragment_view1.xml)

    package com.example.fragmenttest;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

public class FirstView extends DropDownMenu
{
    private TextView firstText;
    private Button btn;

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


        View view = inflater.inflate(R.layout.fragment_view1,container,false);


        firstText = (TextView)view.findViewById(R.id.viewOneText);
        btn = (Button)view.findViewById(R.id.viewOneBtn);

        btn.setOnClickListener(new ButtonEvent());
        return view;

    }

    private class ButtonEvent implements OnClickListener
    {

        @Override
        public void onClick(View v)
        {
            // Create new fragment and transaction
            Fragment newFragment =  new CustomView();
            FragmentTransaction transaction = getFragmentManager().beginTransaction();

            // Replace whatever is in the fragment_container view with this fragment,
            // and add the transaction to the back stack
            transaction.replace(R.id.fragment_view, newFragment);
            transaction.addToBackStack(null);

            // Commit the transaction
            transaction.commit();
        }

    }


}

CustomView.java (uses custom_view.xml)

package com.example.fragmenttest;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;

public class CustomView extends Fragment
{
    private TextView secondText;
    private Button secondViewBtn;

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        View view = inflater.inflate(R.layout.custom_view,container,false);

        return view;

    }


}

In FirstView.java, when I click on the button, I need to move to the Fragment CustomView. But instead moving, it simply replaces everything in CustomView on top of FirstView. Below images will explain it better.

FirstView alone

CustomView alone

When the button is FirstView clicked

Why it is happening like this? Please help

解决方案

You are trying to replace firstView with the new fragment, but firstView is not a fragment, its' a RelativeLayout.

You cannot replace a fragment defined statically in the layout file. You can only replace fragments that you added dynamically via a FragmentTransaction.

None of your Layout contains fragment in layout.

<fragment
        android:id="@+id/fragment1"
        android:layout_width="march_parent"
        android:layout_height="match_parent"></fragment>

A new Fragment will replace an existing Fragment that was previously added to the container.

Take look on this.

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