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我正在開發一個Madlib應用程序。您在下面看到的代碼是處理從madlibinput1.xml中的edittext框中收集輸入的類，將該信息存儲爲字符串，然後將該文本發送到madliboutput.xml，在那裏它將輸入中收集的輸入替換爲所有「wx」 XML。這個類曾經是一個活動，但是我發現將它作爲一個片段可以更好地實現我的導航抽屜。不過，我幾乎是一個初學者（通常是編程語言），並且覺得我沒有將代碼轉換爲與片段一起工作的很好。將活動轉換爲片段？獲取空指針異常
有人可以幫我弄清楚爲什麼當我點擊轉換按鈕時，在gather（）方法（也許是其他地方的空指針）中有空指針異常。也許我做錯了一些關於我的xml的信息或者與我的視圖有關的信息。非常感謝你的支持。
package com.shamu11.madlibsportable;
import java.io.IOException;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.TextView;
import android.app.Activity;
import android.content.Context;
import android.content.res.Resources;
public class Madlibs extends Fragment {
int inLayout; // will hold the id number for layout file
// main_class_activity_in.xml.
int outLayout; // will hold the id number for layout file
// main_class_activity_out.xml.
int outviewid; // will hold the id number for the textview found in
// main_class_activity_out.xml
//Activity activity = this;
String test;
AutoCompleteTextView autoview;
StringBuffer stringbuffer = new StringBuffer();
String[] stringviews = new String[16];
Button convert;
View view;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//super.onCreate(savedInstanceState);
view = inflater.inflate(R.layout.madlibinput1, container, false);
//setContentView(R.layout.madlibinput1);
outLayout = (R.layout.madliboutput1);
inLayout = (R.layout.madlibinput1);
outviewid = (R.id.outview14);
convert = (Button) view.findViewById(R.id.convert);
convert.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
gather();
postIt();
}
});
return view;
}
public void gather() {
ViewGroup layout = (ViewGroup) getView().findViewById(R.id.anskey_clover);
View[] views = new View[layout.getChildCount()];
int[] ids = new int[layout.getChildCount()];
for (int i = 0; i < layout.getChildCount(); i++) {
ids[i] = layout.getChildAt(i).getId();
}
for (int i = 0; i < layout.getChildCount(); i++) {
AutoCompleteTextView au = (AutoCompleteTextView) getActivity().findViewById(ids[i]);
stringbuffer.append(au.getText().toString() + "\n");
}
//setContentView(outLayout);
TextView outview = (TextView) getView().findViewById(outviewid);
outview.setText(stringbuffer.toString());
}
public void postIt() {
String str = "let's go to the park";
String str2;
String newstr = null;
//setContentView(outLayout);
TextView outview = (TextView) view.findViewById(outviewid);
str = (String) outview.getText();
stringviews = stringbuffer.toString().split("\n"); // turns the
// stringbuffer from
// getAllXml() into
// an array and
// assigns to
// stringviews.
for (int i = 0; i < stringviews.length; i++) {
str2 = stringviews[i];
newstr = str.replaceFirst("wx", str2); // replaces all the "wx"s in
// the
// main_class_activity_out
// textview with values from
// strinvgviews.
str = newstr;
}
outview.setText(newstr);
stringbuffer.delete(0, stringbuffer.length());
Fragment newFragment = new MadlibsOutput();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.fragment1, newFragment);
transaction.addToBackStack(null);
transaction.commit();
}
}
madlibinput1.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#ffffff" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0.39"
android:background="#ffffff" >
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="184dp"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#ffffff" >
<TextView
android:id="@+id/outview1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="1.) Adjective to Describe:" />
<TextView
android:id="@+id/lvheader_song"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="2.) ing-verb (i.e. running):" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="3.) Negative Adjective:" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="4.) Negative Verb:" />
<TextView
android:id="@+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="5.) Adjective" />
<TextView
android:id="@+id/textView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="6.) Plural Noun:" />
<TextView
android:id="@+id/textView7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="8dp"
android:text="7.) Verb (ending in '-ed'):" />
</LinearLayout>
<LinearLayout
android:id="@+id/anskey_clover"
android:layout_width="match_parent"
android:layout_height="234dp"
android:orientation="vertical" >
<AutoCompleteTextView
android:id="@+id/auview1"
android:layout_width="141dp"
android:layout_height="wrap_content"
android:layout_weight="0.40"
android:ems="10"
android:text="la dee dah" />
<AutoCompleteTextView
android:id="@+id/auview2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10" />
<AutoCompleteTextView
android:id="@+id/auview3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10" />
<AutoCompleteTextView
android:id="@+id/auview4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10" />
<AutoCompleteTextView
android:id="@+id/auview5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10" />
<AutoCompleteTextView
android:id="@+id/auview6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10" />
<AutoCompleteTextView
android:id="@+id/auview7"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_weight="1"
android:ems="10" />
</LinearLayout>
</LinearLayout>
<Button
android:id="@+id/convert"
android:layout_width="222dp"
android:layout_height="93dp"
android:layout_weight="0.25"
android:text="Get My Mad Lib" />
</LinearLayout>
madliboutput1.xml：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/outview14"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="20dp"
android:gravity="left"
android:text="madlib text.........etc" />
</LinearLayout>
LOG CAT：
06-30 23:00:11.530: E/AndroidRuntime(5567): FATAL EXCEPTION: main
06-30 23:00:11.530: E/AndroidRuntime(5567): Process: com.shamu11.madlibsportable, PID: 5567
06-30 23:00:11.530: E/AndroidRuntime(5567): java.lang.NullPointerException
06-30 23:00:11.530: E/AndroidRuntime(5567): at com.shamu11.madlibsportable.Madlibs.gather(Madlibs.java:78)
06-30 23:00:11.530: E/AndroidRuntime(5567): at com.shamu11.madlibsportable.Madlibs$1.onClick(Madlibs.java:51)
06-30 23:00:11.530: E/AndroidRuntime(5567): at android.view.View.performClick(View.java:4438)
06-30 23:00:11.530: E/AndroidRuntime(5567): at android.view.View$PerformClick.run(View.java:18422)
06-30 23:00:11.530: E/AndroidRuntime(5567): at android.os.Handler.handleCallback(Handler.java:733)
06-30 23:00:11.530: E/AndroidRuntime(5567): at android.os.Handler.dispatchMessage(Handler.java:95)
06-30 23:00:11.530: E/AndroidRuntime(5567): at android.os.Looper.loop(Looper.java:136)
06-30 23:00:11.530: E/AndroidRuntime(5567): at android.app.ActivityThread.main(ActivityThread.java:5001)
06-30 23:00:11.530: E/AndroidRuntime(5567): at java.lang.reflect.Method.invokeNative(Native Method)
06-30 23:00:11.530: E/AndroidRuntime(5567): at java.lang.reflect.Method.invoke(Method.java:515)
06-30 23:00:11.530: E/AndroidRuntime(5567): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
06-30 23:00:11.530: E/AndroidRuntime(5567): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
06-30 23:00:11.530: E/AndroidRuntime(5567): at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:132)
06-30 23:00:11.530: E/AndroidRuntime(5567): at dalvik.system.NativeStart.main(Native Method)
你在'outview.setText（stringbuffer.toString（））上得到NPE'''我認爲'outView'爲null –
@shayanpourvatan有什麼建議嗎？ – sanic
我認爲問題是'getView（）。findViewById（outviewid）;' –