Question

我创建了两个片段类，然后在activity_main.xml中我提到了两个片段标记，并且也提到了name属性。

FragmentClass;

package com.example.hsports.fragmentsinandroid;

import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * Created by I324671 on 8/27/2016.
 */
public class FragmentClass extends Fragment {

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



        return inflater.inflate(R.layout.fragmentlayout,container,false);



    }
}

FragmentClass2：

package com.example.hsports.fragmentsinandroid;

import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

/**
 * Created by I324671 on 8/27/2016.
 */
public class FragmentClass2 extends Fragment {

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragmentlayout,container,false);
    }
}

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<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="com.example.hsports.fragmentsinandroid.MainActivity">



    <fragment android:name="com.example.hsports.fragmentsinandroid.FragmentClass"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/firstFrag"
        />
    <fragment android:name="com.example.hsports.fragmentsinandroid.FragmentClass2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/secondFrag"
        />


</RelativeLayout>

用于片段的布局是这样的：

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


    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="This is the first one"
        />



</LinearLayout>

现在，当我在模拟器中运行代码时，我只是在textView中显示消息一次。看起来我得到的是firstFragment，而不是第二个。我该怎么做才能打印这两个碎片？

Answer 1

他们正在重叠。使用 layout_below 和 layout_alignParentTop 属性更新了代码。

    <fragment android:name="com.example.hsports.fragmentsinandroid.FragmentClass"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
android:layout_alignParentTop="true"
        android:id="@+id/firstFrag"
        />
    <fragment android:name="com.example.hsports.fragmentsinandroid.FragmentClass2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/secondFrag"
android:layout_below="@+id/firstFrag"
        />

activity.xml中提到的片段未显示在模拟器中

1 个答案: