SherlockActivity가 ListView의 ArrayList/ArrayAdapter와 충돌합니다.

Question

My SherlockActivity : EditText, Button 및 ListView가있는 레이아웃을 부 풀립니다.

<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" 
tools:context=".MainActivity" > 

<ListView 
    android:id="@+id/listView1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_below="@+id/editText1" > 
</ListView> 

<Button 
    android:id="@+id/button1" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_alignBottom="@+id/editText1" 
    android:layout_alignParentRight="true" 
    android:layout_alignParentTop="true" 
    android:text="Add" 
    tools:ignore="HardcodedText" /> 

<EditText 
    android:id="@+id/editText1" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentTop="true" 
    android:layout_toLeftOf="@+id/button1" 
    android:ems="10" 
    android:hint="Click add!" 
    android:inputType="text" 
    tools:ignore="HardcodedText" > 
</EditText> 

내 MainActivity는 다음

<menu xmlns:android="http://schemas.android.com/apk/res/android" > 

<item 
    android:id="@+id/menu_settings" 
    android:orderInCategory="100" 
    android:showAsAction="never" 
    android:title="@string/menu_settings"/> 
<item 
    android:id="@+id/add_item" 
    android:orderInCategory="1" 
    android:showAsAction="ifRoom" 
    android:title="@string/add"/> 
<item 
    android:id="@+id/calendar" 
    android:orderInCategory="2" 
    android:showAsAction="ifRoom" 
    android:title="@string/show_cal"/> 
</menu> 

내가 SherlockActivity를 확장하는 BaseActivity를 만들의 메뉴 레이아웃 파일을 팽창 BaseActivity를 확장합니다.

package com.courseorganizer; 

import com.actionbarsherlock.app.SherlockActivity; 
import com.actionbarsherlock.view.Menu; 

public class BaseActivity extends SherlockActivity { 
    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getSupportMenuInflater().inflate(R.menu.activity_main, menu); 
     return true; 
    } 
} 

MainActivity는 내가 문제가있는 곳입니다. BaseActivity를 확장하고 onOptionsItemSelected()를 설정하여 "추가"탭을 선택한 경우 입력 필드가 호출되도록합니다. 그런 다음 버튼에 OnClickListener를 설정하여 ArrayAdapter에 들어있는 ArrayList에 채워진 ListView에 사용자의 입력을 추가합니다.

package com.courseorganizer; 

import java.util.ArrayList; 

import android.os.Bundle; 
import android.util.Log; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.ArrayAdapter; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.ListView; 

import com.actionbarsherlock.view.MenuItem; 

public class MainActivity extends BaseActivity { 

private final String TAG = "Main Activity"; 

// LIST OF ARRAY STRINGS WHICH WILL SERVE AS LIST ITEMS 
ArrayList<String> listItems = new ArrayList<String>(); 

// DEFINING STRING ADAPTER WHICH WILL HANDLE DATA OF LISTVIEW 
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, listItems); 

Button addItem = (Button)findViewById(R.id.button1); 
EditText input = (EditText)findViewById(R.id.editText1); 
ListView courseList = (ListView)findViewById(R.id.listView1); 

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

    addItem.setOnClickListener(new OnClickListener() { 
     public void onClick(View v) { 
      listItems.add(input.getText().toString()); 
      courseList.setAdapter(adapter); 
     } 
    }); 
} 

@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
    switch (item.getItemId()) { 
    case R.id.add_item: 
     input.requestFocus(); 
     Log.i(TAG, "Add Clicked"); 
     return true; 
    case R.id.calendar: 
     Log.i(TAG, "Calendar Clicked"); 
     return true; 
    default: 
     return super.onOptionsItemSelected(item); 
    } 
} 
} 

나는 당신의 도움을 주셔서 감사합니다 : 여기

는 MainActivity입니다! 검색 할 컨텍스트 또는 레이아웃이 없기 때문에,

11-04 19:16:24.517: D/AndroidRuntime(305): Shutting down VM 
11-04 19:16:24.517: W/dalvikvm(305): threadid=1: thread exiting with uncaught exception  (group=0x4001d800) 
11-04 19:16:24.569: E/AndroidRuntime(305): FATAL EXCEPTION: main 
11-04 19:16:24.569: E/AndroidRuntime(305): java.lang.RuntimeException: Unable to  instantiate activity ComponentInfo{com.courseorganizer/com.courseorganizer.MainActivity}:  java.lang.IllegalStateException: System services not available to Activities before  onCreate() 
11-04 19:16:24.569: E/AndroidRuntime(305): at  android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585) 
11-04 19:16:24.569: E/AndroidRuntime(305): at  android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679) 
11-04 19:16:24.569: E/AndroidRuntime(305): at  android.app.ActivityThread.access$2300(ActivityThread.java:125) 
11-04 19:16:24.569: E/AndroidRuntime(305): at  android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033) 
11-04 19:16:24.569: E/AndroidRuntime(305): at  android.os.Handler.dispatchMessage(Handler.java:99) 
11-04 19:16:24.569: E/AndroidRuntime(305): at android.os.Looper.loop(Looper.java:123) 
11-04 19:16:24.569: E/AndroidRuntime(305): at  android.app.ActivityThread.main(ActivityThread.java:4627) 
11-04 19:16:24.569: E/AndroidRuntime(305): at  java.lang.reflect.Method.invokeNative(Native Method) 
11-04 19:16:24.569: E/AndroidRuntime(305): at  java.lang.reflect.Method.invoke(Method.java:521) 
11-04 19:16:24.569: E/AndroidRuntime(305): at  com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
11-04 19:16:24.569: E/AndroidRuntime(305): at  com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
11-04 19:16:24.569: E/AndroidRuntime(305): at dalvik.system.NativeStart.main(Native  Method) 
11-04 19:16:24.569: E/AndroidRuntime(305): Caused by: java.lang.IllegalStateException:  System services not available to Activities before onCreate() 
11-04 19:16:24.569: E/AndroidRuntime(305): at  android.app.Activity.getSystemService(Activity.java:3526) 
11-04 19:16:24.569: E/AndroidRuntime(305): at  android.widget.ArrayAdapter.init(ArrayAdapter.java:271) 
11-04 19:16:24.569: E/AndroidRuntime(305): at android.widget.ArrayAdapter.<init> (ArrayAdapter.java:150) 
11-04 19:16:24.569: E/AndroidRuntime(305): at com.courseorganizer.MainActivity.<init> (MainActivity.java:24) 
11-04 19:16:24.569: E/AndroidRuntime(305): at java.lang.Class.newInstanceImpl(Native  Method) 
11-04 19:16:24.569: E/AndroidRuntime(305): at  java.lang.Class.newInstance(Class.java:1429) 
11-04 19:16:24.569: E/AndroidRuntime(305): at  android.app.Instrumentation.newActivity(Instrumentation.java:1021) 
11-04 19:16:24.569: E/AndroidRuntime(305): at  android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577) 
11-04 19:16:24.569: E/AndroidRuntime(305): ... 11 more 
11-04 19:16:26.998: I/Process(305): Sending signal. PID: 305 SIG: 9 

Answer 1

findViewById()이 onCreate() 및 setContentView() 전에 호출 할 수 없습니다

편집 : 여기 내 로그 캣 출력입니다.

setContentView() 다음에이 라인을 onCreate()으로 이동하십시오.

addItem = (Button)findViewById(R.id.button1); 
input = (EditText)findViewById(R.id.editText1); 
courseList = (ListView)findViewById(R.id.listView1);