java - 片段错误android
问题描述
我的代码中有很多异常。它在我的代码中指向的唯一引用位于第 24 行，即 setContentView(R.layout.activity_main)。我不懂为什么 ：
07-12 01:36:51.433 3796-3796/com.example.egi.mavisme E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.egi.mavisme, PID: 3796
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.egi.mavisme/com.example.egi.mavisme.MainActivity}: android.view.InflateException: Binary XML file line #49: Binary XML file line #49: Error inflating class fragment
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2543)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2609)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1465)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5683)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
Caused by: android.view.InflateException: Binary XML file line #49: Binary XML file line #49: Error inflating class fragment
at android.view.LayoutInflater.inflate(LayoutInflater.java:539)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:467)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.example.egi.mavisme.MainActivity.onCreate(MainActivity.java:24)
at android.app.Activity.performCreate(Activity.java:6270)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1113)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2609)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1465)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5683)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
Caused by: android.view.InflateException: Binary XML file line #49: Error inflating class fragment
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:782)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:467)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.example.egi.mavisme.MainActivity.onCreate(MainActivity.java:24)
at android.app.Activity.performCreate(Activity.java:6270)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1113)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2609)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1465)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5683)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
Caused by: java.lang.IllegalStateException: Fragment com.example.egi.mavisme.HeaderNav did not create a view.
at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:3776)
at android.support.v4.app.FragmentController.onCreateView(FragmentController.java:120)
at android.support.v4.app.FragmentActivity.dispatchFragmentsOnCreateView(FragmentActivity.java:395)
at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:377)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:754)
at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:704)
at android.view.LayoutInflater.rInflate(LayoutInflater.java:835)
at android.view.LayoutInflater.rInflateChildren(LayoutInflater.java:798)
at android.view.LayoutInflater.inflate(LayoutInflater.java:515)
at android.view.LayoutInflater.inflate(LayoutInflater.java:423)
at android.view.LayoutInflater.inflate(LayoutInflater.java:374)
at android.support.v7.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:467)
at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
at com.example.egi.mavisme.MainActivity.onCreate(MainActivity.java:24)
at android.app.Activity.performCreate(Activity.java:6270)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1113)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2609)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1465)
at android.os.Handler.dispatchMessage(Handler.java:111)
at android.os.Looper.loop(Looper.java:207)
at android.app.ActivityThread.main(ActivityThread.java:5683)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
我的主要活动：
public class MainActivity extends AppCompatActivity {
private TextView mavisTxt;
private Button testBtn;
private Fragment navbar = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initVariables();
}
private void initVariables() {
mavisTxt = (TextView)findViewById(R.id.mavisTxt);
testBtn = (Button)findViewById(R.id.testBtn);
navbar = new HeaderNav();
testBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
hideNavbar();
}
});
}
private void hideNavbar() {
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.hide(navbar);
ft.commit();
}
}
我的片段类：
package com.example.egi.mavisme;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.app.Activity;
import android.widget.Button;
public class HeaderNav extends Fragment {
private static Button homeBtn, optionsBtn, connectionBtn, micBtn, aboutBtn;
public View onViewCreated(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.navbar, container, false);
homeBtn = (Button)view.findViewById(R.id.homeBtn);
optionsBtn = (Button)view.findViewById(R.id.optionsBtn);
connectionBtn = (Button)view.findViewById(R.id.micBtn);
micBtn = (Button)view.findViewById(R.id.homeBtn);
aboutBtn = (Button)view.findViewById(R.id.aboutBtn);
return view;
}
}
主要活动xml布局：
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="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:background="@drawable/background"
tools:context=".MainActivity">
<ImageView
android:id="@+id/imageView"
android:layout_width="239dp"
android:layout_height="227dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:contentDescription="mainicon"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.503"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.271"
app:srcCompat="@drawable/main" />
<TextView
android:id="@+id/mavisTxt"
android:layout_width="237dp"
android:layout_height="177dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:fontFamily="@font/titillium_light"
android:text="Talk you bastard."
android:textColor="#ffffff"
android:textSize="30dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageView"
app:layout_constraintVertical_bias="0.063" />
<fragment
android:id="@+id/navbar"
android:name="com.example.egi.mavisme.HeaderNav"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:layout="@layout/navbar" />
<Button
android:id="@+id/testBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:text="Button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent" />
</android.support.constraint.ConstraintLayout>
这是片段的xml文件：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent" android:layout_height="match_parent">
<ImageView
android:id="@+id/imageView4"
android:layout_width="match_parent"
android:layout_height="65dp"
android:layout_alignParentStart="true"
android:layout_alignParentTop="true"
android:adjustViewBounds="false"
android:cropToPadding="false"
app:srcCompat="@drawable/navbar" />
<Button
android:id="@+id/homeBtn"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_centerInParent="@+id/imageView4"
android:layout_alignTop="@+id/imageView4"
android:layout_marginTop="6dp"
android:layout_marginStart="30dp"
android:background="@drawable/home_icon" />
<Button
android:id="@+id/optionsBtn"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_centerInParent="@+id/imageView4"
android:layout_alignTop="@+id/imageView4"
android:layout_marginTop="6dp"
android:layout_marginStart="100dp"
android:background="@drawable/options_icon" />
<Button
android:id="@+id/micBtn"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_alignTop="@+id/homeBtn"
android:layout_centerHorizontal="true"
android:background="@drawable/mic_icon" />
<Button
android:id="@+id/connectionBtn"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_centerInParent="@+id/imageView4"
android:layout_alignTop="@+id/imageView4"
android:layout_marginTop="6dp"
android:layout_marginStart="240dp"
android:background="@drawable/con_icon" />
<Button
android:id="@+id/aboutBtn"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_centerInParent="@+id/imageView4"
android:layout_alignTop="@+id/imageView4"
android:layout_marginTop="6dp"
android:layout_marginStart="310dp"
android:background="@drawable/about_icon" />
</RelativeLayout>
我在这里尝试了一些解决方案，但都没有奏效。我目前对 android dev 还是新手，所以我想在研究这个问题时把它贴在这里。
解决方案
HeaderNav 中的函数名称不正确。它应该是：
public class HeaderNav extends Fragment {
private static Button homeBtn, optionsBtn, connectionBtn, micBtn, aboutBtn;
@Override
public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.navbar, container, false);
homeBtn = (Button)view.findViewById(R.id.homeBtn);
optionsBtn = (Button)view.findViewById(R.id.optionsBtn);
connectionBtn = (Button)view.findViewById(R.id.micBtn);
micBtn = (Button)view.findViewById(R.id.homeBtn);
aboutBtn = (Button)view.findViewById(R.id.aboutBtn);
return view;
}
}
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