Android中的第一个片段应用程序有很多错误

我刚开始学习android，我想构建一个应用程序片段但我得到了太多的错误，我不知道从哪里开始调试作为初学者我想求人找到的bug /错误，并知道如何的问题，输入代码在这里Android中的第一个片段应用程序有很多错误

07-09 23:16:45.075 8822-8822/? I/art﹕ Not late-enabling -Xcheck:jni (already on) 
07-09 23:16:45.273 8822-8822/com.example.android.myapplication D/AndroidRuntime﹕ Shutting down VM 
07-09 23:16:45.274 8822-8822/com.example.android.myapplication E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    Process: com.example.android.myapplication, PID: 8822 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android.myapplication/com.example.android.myapplication.MainActivity}: android.view.InflateException: Binary XML file line #9: Error inflating class fragment 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390) 
      at android.app.ActivityThread.access$800(ActivityThread.java:151) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:135) 
      at android.app.ActivityThread.main(ActivityThread.java:5257) 
      at java.lang.reflect.Method.invoke(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:372) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
    Caused by: android.view.InflateException: Binary XML file line #9: Error inflating class fragment 
      at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:763) 
      at android.view.LayoutInflater.rInflate(LayoutInflater.java:806) 
      at android.view.LayoutInflater.inflate(LayoutInflater.java:504) 
      at android.view.LayoutInflater.inflate(LayoutInflater.java:414) 
      at android.view.LayoutInflater.inflate(LayoutInflater.java:365) 
      at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:249) 
      at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:106) 
      at com.example.android.myapplication.MainActivity.onCreate(MainActivity.java:25) 
      at android.app.Activity.performCreate(Activity.java:5990) 
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390) 
            at android.app.ActivityThread.access$800(ActivityThread.java:151) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:135) 
            at android.app.ActivityThread.main(ActivityThread.java:5257) 
            at java.lang.reflect.Method.invoke(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:372) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
    Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference 
      at com.example.android.myapplication.TopFragment.onCreateView(TopFragment.java:54) 
      at android.support.v4.app.Fragment.performCreateView(Fragment.java:1789) 
      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:924) 
      at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1116) 
      at android.support.v4.app.FragmentManagerImpl.addFragment(FragmentManager.java:1218) 
      at android.support.v4.app.FragmentManagerImpl.onCreateView(FragmentManager.java:2170) 
      at android.support.v4.app.FragmentActivity.onCreateView(FragmentActivity.java:300) 
      at android.support.v7.app.AppCompatDelegateImplV7.callActivityOnCreateView(AppCompatDelegateImplV7.java:838) 
      at android.support.v7.app.AppCompatDelegateImplV11.callActivityOnCreateView(AppCompatDelegateImplV11.java:34) 
      at android.support.v7.app.AppCompatDelegateImplV7.onCreateView(AppCompatDelegateImplV7.java:826) 
      at android.support.v4.view.LayoutInflaterCompatHC$FactoryWrapperHC.onCreateView(LayoutInflaterCompatHC.java:44) 
      at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:725) 
            at android.view.LayoutInflater.rInflate(LayoutInflater.java:806) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:504) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:414) 
            at android.view.LayoutInflater.inflate(LayoutInflater.java:365) 
            at android.support.v7.app.AppCompatDelegateImplV7.setContentView(AppCompatDelegateImplV7.java:249) 
            at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:106) 
            at com.example.android.myapplication.MainActivity.onCreate(MainActivity.java:25) 
            at android.app.Activity.performCreate(Activity.java:5990) 
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106) 
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278) 
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390) 
            at android.app.ActivityThread.access$800(ActivityThread.java:151) 
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303) 
            at android.os.Handler.dispatchMessage(Handler.java:102) 
            at android.os.Looper.loop(Looper.java:135) 
            at android.app.ActivityThread.main(ActivityThread.java:5257) 
            at java.lang.reflect.Method.invoke(Native Method) 
            at java.lang.reflect.Method.invoke(Method.java:372) 
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698) 
07-09 23:16:45.282 8822-8834/com.example.android.myapplication I/art﹕ Background partial concurrent mark sweep GC freed 172(20KB) AllocSpace objects, 0(0B) LOS objects, 34% free, 7MB/11MB, paused 15.024ms total 30.293ms 
07-09 23:18:50.643 8822-8829/com.example.android.myapplication W/art﹕ Suspending all threads took: 5.642ms

BottomFragment

package com.example.android.myapplication; 

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.widget.TextView; 

/** 
* Created by 0110 on 09/07/2015. 
*/ 
public class BottomFragment extends Fragment { 

private static TextView CenterView; 
private static TextView BottomView; 


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

    CenterView = (TextView) view.findViewById(R.id.firstText); 
    BottomView = (TextView) view.findViewById(R.id.secondText); 





    return view; 
} 


public void setMeme(String top, String Bottom){ 

    CenterView.setText(top); 
    BottomView.setText(Bottom); 
}

}

调试这种

TopFragment

package com.example.android.myapplication; 


import android.app.Activity; 
import android.os.Bundle; 
import android.support.v4.app.Fragment; 
import android.support.annotation.Nullable; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.Button; 
import android.widget.EditText; 

/** 
* Created by 0110 on 08/07/2015. 
*/ 


public class TopFragment extends Fragment { 


public static EditText first; 
public static EditText second; 


TopFragListener activityCommander; 

public interface TopFragListener{ 
    void CreatMeme(String top, String Bottom); 
} 


@Override 
public void onAttach(Activity activity) { 
    super.onAttach(activity); 
    try { 
     activityCommander = (TopFragListener)activity; 
    }catch (ClassCastException e){ 
     throw new ClassCastException(activity.toString()); 
    } 
} 

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


    first = (EditText) view.findViewById(R.id.editText); 
    second = (EditText)view.findViewById(R.id.editText2); 
    final Button button = (Button) view.findViewById(R.id.button); 


    button.setOnClickListener(
      new View.OnClickListener(){ 
       public void onClick(View v){ 
        buttonClicked(v); 
       } 
      } 
    ); 



    return view; 
} 


public void buttonClicked(View v){ 
    activityCommander.CreatMeme(first.getText().toString(),second.getText().toString()); 

}

}

MainActivity

package com.example.android.myapplication; 

import android.support.v7.app.ActionBarActivity; 

import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 



public class MainActivity extends ActionBarActivity implements  TopFragment.TopFragListener{ 


@Override 
public void CreatMeme(String top, String Bottom) { 
    BottomFragment BottomFragmenT = (BottomFragment) getSupportFragmentManager().findFragmentById(R.id.fragment2); 
    BottomFragmenT.setMeme(top,Bottom); 


} 

@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); 
} 
}

MainActivity 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:orientation="vertical" 

tools:context=".MainActivity"> 

<fragment 
    android:layout_width="match_parent" 
    android:layout_height="240dp" 
    android:name="com.example.android.myapplication.TopFragment" 
    android:id="@+id/fragment" 

    tools:layout="@layout/topfragment" 
    android:layout_alignParentLeft="true" 
    android:layout_marginLeft="0dp" 
    android:layout_alignParentTop="true" 
    android:layout_marginTop="0dp" /> 

<fragment 
    android:layout_width="match_parent" 
    android:layout_height="500dp" 
    android:name="com.example.android.myapplication.BottomFragment" 
    android:id="@+id/fragment2" 
    android:layout_gravity="center_horizontal" 

    tools:layout="@layout/bottomframgent" 
    android:layout_alignParentLeft="true" 
    android:layout_marginLeft="0dp" 
    android:layout_below="@+id/fragment" /> 
</RelativeLayout>

Topfragment 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="wrap_content" 
android:id="@+id/topFrag"> 

<EditText 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/editText" 
    android:layout_alignParentTop="true" 
    android:layout_centerHorizontal="true" 
    android:gravity="center_horizontal" 
    android:text="@string/toptext" 
    android:layout_marginTop="20dp"/> 

<EditText 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/editText2" 
    android:layout_below="@+id/editText" 
    android:layout_centerHorizontal="true" 
    android:layout_marginTop="36dp" 
    android:gravity="center_horizontal" 
    android:text="@string/bottomtext" /> 

<Button 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:text="@string/buttonText" 
    android:id="@+id/button" 
    android:layout_below="@+id/editText2" 
    android:layout_centerHorizontal="true" /> 
</RelativeLayout>

bottemfragment 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:background="@drawable/abcdef" 
android:id="@+id/bottomFrag"> 

<TextView 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="CenterView" 
    android:gravity="center_horizontal" 
    android:id="@+id/firstText" 
    android:layout_centerVertical="true" 
    android:layout_centerHorizontal="true" 
    android:textColor="#fff"/> 

<TextView 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:textAppearance="?android:attr/textAppearanceLarge" 
    android:text="BottomText" 
    android:gravity="center_horizontal" 

    android:id="@+id/secondText" 
    android:layout_alignParentBottom="true" 
    android:layout_centerHorizontal="true" 
    android:textColor="#fff" /> 
</RelativeLayout>

来源

2015-07-09 nizzard0094

您inlfating错误的XML文件中TopFragment：中

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

代替

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

，反之为底部片段

来源

2015-07-09 20:56:39 Lester

谢谢你，怎么样你知道吗？编译器运行时错误让我离解决方案更远 – nizzard0094

@ nizzard0094刚刚看到你的logcats traceview。 NPE在按钮Object - >上设置clicklistener时发生，因此它在null中导致它不能在错误的xml文件中找到 – Lester

Android中的第一个片段应用程序有很多错误

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