个人中心
gpt4 book ai didi

java - 来自不同口味的 fragment 膨胀

转载 作者：行者123 更新时间：2023-11-29 08:30:43 25 4
gpt4 key购买 nike

我正在学习 Android，当它们有不同的风格时，我无法找到 fragment 实例化错误的解决方案。

设置:

  • 我有一个加载到主要 Activity 中的主要 fragment 。
  • 我有两个好处:付费的和免费的。
  • 应用程序的主要(公共(public))部分没有 fragment (布局 + java 文件)，我把它们放到了 favor 中。

当我尝试运行我的程序时出现以下错误:

01-24 19:38:06.211 27417-27417/com.udacity.gradle.builditbigger.paid E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.udacity.gradle.builditbigger.paid, PID: 27417
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.udacity.gradle.builditbigger.paid/com.udacity.gradle.builditbigger.MainActivity}: android.view.InflateException: Binary XML file line #1: Binary XML file line #1: Error inflating class fragment
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2817)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
    at android.app.ActivityThread.-wrap11(Unknown Source:0)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
    at android.os.Handler.dispatchMessage(Handler.java:105)
    at android.os.Looper.loop(Looper.java:164)
    at android.app.ActivityThread.main(ActivityThread.java:6541)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: android.view.InflateException: Binary XML file line #1: Binary XML file line #1: Error inflating class fragment
Caused by: android.view.InflateException: Binary XML file line #1: Error inflating class fragment
Caused by: java.lang.NullPointerException
    at java.lang.VMClassLoader.findLoadedClass(Native Method)
    at java.lang.ClassLoader.findLoadedClass(ClassLoader.java:738)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:363)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
    at android.support.v4.app.Fragment.isSupportFragmentClass(Fragment.java:499)
    at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3637)
    at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:111)
    at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:338)
    at android.support.v4.app.BaseFragmentActivityApi14.onCreateView(BaseFragmentActivityApi14.java:39)
    at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:67)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:780)
    at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:730)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:492)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
    at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
    at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:287)
    at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:139)
    at com.udacity.gradle.builditbigger.MainActivity.onCreate(MainActivity.java:14)
    at android.app.Activity.performCreate(Activity.java:6975)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1213)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2770)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2892)
    at android.app.ActivityThread.-wrap11(Unknown Source:0)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1593)
    at android.os.Handler.dispatchMessage(Handler.java:105)
    at android.os.Looper.loop(Looper.java:164)
    at android.app.ActivityThread.main(ActivityThread.java:6541)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)

我尝试了很多不同版本的 fragment 名称，因为错误消息告诉我问题出在那个 fragment 名称上，不幸的是，它们都不起作用。你能帮我找到问题的根源吗(我的意思不仅仅是解决方案，但为什么这不起作用)？ The code can be found on GitHub , 但相关文件在这里:

src/java/com/udacity/gradle/builditbigger/MainActivity.java

package com.udacity.gradle.builditbigger;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
}


@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.menu_main, menu);
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();

    //noinspection SimplifiableIfStatement
    if (id == R.id.action_settings) {
        return true;
    }

    return super.onOptionsItemSelected(item);
}

public void tellJoke(View view) {
    new EndpointsAsyncTask().execute(this);
}
}

src/res/layout/activity_main.xml

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout="@layout/fragment_main" />

src/free/java/com/udacity/gradle/builditbigger/free/MainActivityFragment.java

package com.udacity.gradle.builditbigger.free;

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

import com.google.android.gms.ads.AdRequest;
import com.google.android.gms.ads.AdView;
import com.udacity.gradle.builditbigger.R;


/**
 * A placeholder fragment containing a simple view.
 */
public class MainActivityFragment extends Fragment {

public MainActivityFragment() {
}

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View root = inflater.inflate(R.layout.fragment_main, container, false);

    AdView mAdView = (AdView) root.findViewById(R.id.adView);
    // Create an ad request. Check logcat output for the hashed device ID to
    // get test ads on a physical device. e.g.
    // "Use AdRequest.Builder.addTestDevice("ABCDEF012345") to get test ads on this device."
    AdRequest adRequest = new AdRequest.Builder()
            .addTestDevice(AdRequest.DEVICE_ID_EMULATOR)
            .build();
    mAdView.loadAd(adRequest);
    return root;
}
}

src/free/res/layout/fragment_main.xml

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:ads="http://schemas.android.com/apk/res-auto"
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.udacity.gradle.builditbigger.MainActivity">

<TextView
    android:id="@+id/instructions_text_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/instructions" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/instructions_text_view"
    android:onClick="tellJoke"
    android:text="@string/button_text" />

<com.google.android.gms.ads.AdView
    android:id="@+id/adView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    ads:adSize="BANNER"
    ads:adUnitId="@string/banner_ad_unit_id" />

</RelativeLayout>

src/paid/java/com/udacity/gradle/builditbigger/paid/MainActivityFragment.java

package com.udacity.gradle.builditbigger.paid;

import android.support.v4.app.Fragment;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.udacity.gradle.builditbigger.R;


/**
 * A placeholder fragment containing a simple view.
 */
public class MainActivityFragment extends Fragment {

public MainActivityFragment() {
}

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

src/paid/res/layout/fragment_main.xml

<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.udacity.gradle.builditbigger.MainActivity">

<TextView
    android:id="@+id/instructions_text_view"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/instructions" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/instructions_text_view"
    android:onClick="tellJoke"
    android:text="@string/button_text" />

</RelativeLayout>

最佳答案

与此同时，我找到了解决方案。在 src/res/layout/activity_main.xml 中，您需要将 android:name 属性赋予 fragment 以使其工作。两种风格的名称相同 (MainActivityFragment)，但命名空间不同(免费 和 付费)。解决此问题的唯一方法是您需要将此布局文件移动到应用程序的 flavor 部分，并从主要部分删除原始文件。长话短说，你必须删除 src/res/layout/activity_main.xml 文件，并将这两个文件添加到项目中:

src/free/res/layout/activity_main.xml

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/fragment"
android:name="com.udacity.gradle.builditbigger.free.MainActivityFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout="@layout/fragment_main" />

src/paid/res/layout/activity_main.xml

<fragment xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/fragment"
android:name="com.udacity.gradle.builditbigger.paid.MainActivityFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout="@layout/fragment_main" />

对于最初的问题，我很抱歉，但我希望它对某人有用。

关于java - 来自不同口味的 fragment 膨胀，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/48430089/

25 4 0
文章推荐： mysql - 具有相关性的全文搜索 - 为什么需要多列索引？
文章推荐： rust - 如何在手动生成的代码中调用 rustfmt？
文章推荐： arrays - 是否可以从终端定义一个常量值？
文章推荐： JAva:如何将自定义对象类型作为参数传递给方法并返回相同的自定义对象类型值
行者123
个人简介

我是一名优秀的程序员,十分优秀！

滴滴打车优惠券免费领取
滴滴打车优惠券
全站热门文章
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com