Android SeekBar 문제

Question

먼저 변경 청취자로 SeekBar를 만들려고합니다. 나는 이것을 정확하게하고 싶다. 아래에서 빨간색은 null 예외를 제공합니다. 그 이유는 내 목록이 하나의 XML이고 내 seekbar/textview 레이아웃이 다른 XML이기 때문입니다. 그럴까요? 어떻게 잡을 까?

seekbars.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:orientation="vertical" 
android:layout_width="fill_parent" 
android:layout_height="wrap_content" 
android:id="@+id/seekBarLayout" 
> 
    <TextView 
     android:gravity="center_horizontal" 
     android:background="#aa0000" 
     android:layout_width="wrap_content" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:id="@+id/seekBarLabel"/> 

     <TextView 
     android:gravity="center_horizontal" 
     android:background="#aa0000" 
     android:layout_width="wrap_content" 
     android:layout_height="0dp" 
     android:layout_weight="1" 
     android:id="@+id/seekBarValue"/> 


    <SeekBar 
     xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:id="@+id/seekBarID"/> 

</LinearLayout> 

seekbarlist.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content"> 

    <ListView 

     android:id="@android:id/list" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content"> 
    </ListView> 


</LinearLayout> 

로이드 코드

package thisPackage.Tabs; 



public class ColorsActivity extends ListActivity implements SeekBar.OnSeekBarChangeListener { 
/** Called when the activity is first created. */ 

//Array Adapter that will hold our ArrayList and display the items on the ListView 
SeekBarAdaptor seekBarAdaptor; 

//List that will host our items and allow us to modify that array adapter 
ArrayList<SeekBar> seekBarArrayList=null; 
TextView myValueText; 

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

    //Initialize ListView   
    ListView lstTest= getListView(); 

    //Initialize our ArrayList 
    seekBarArrayList = new ArrayList<SeekBar>(); 

    //Initialize our array adapter 
    seekBarAdaptor = new SeekBarAdaptor(ColorsActivity.this, R.layout.seekbars,seekBarArrayList); 
    //setContentView(R.layout.seekbars); 
    SeekBar red = (SeekBar)findViewById(R.id.seekBarID); 
    red.setOnSeekBarChangeListener(this); 
    // SeekBar blue = new SeekBar(this); 

    //Set the above adapter as the adapter of choice for our list 
    lstTest.setAdapter(seekBarAdaptor); 

    seekBarArrayList.add(red); 
    //seekBarArrayList.add(blue); 
} 
public void onProgressChanged(SeekBar seekBar, int progress, boolean fromTouch) { 
    //myLayout = (LinearLayout)seekBar.findViewById(R.id.seekBarLayout); 
    myValueText = (TextView)findViewById(R.id.seekBarValue); 
    myValueText.setText("hello"); 
    //myValueText.setText("text"); 
} 
public void onStopTrackingTouch(SeekBar seekBar){ 

} 
public void onStartTrackingTouch (SeekBar seekBar){ 
} 

} 

로그 캣

03-15 00 : 01 : 52.020 : D/AndroidRuntime (345) : VM 종료

03-15 00 : 01 : 52.020 : W/dalvikvm (345) : 1 = threadid : 스레드 캐치되지 않는 예외 군 (= 0x40015560)로 출사

03-15 00 : 01 : 52.040 : E/AndroidRuntime을 (345) : 치명적인 예외 : 주

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) : java.lang.RuntimeException : 활동을 시작할 수 없습니다. ComponentInfo {thisPackage.Tabs/thisPackage.Tabs.ColorsActivity} : java.lang.NullPointerException이

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) android.app.ActivityThread.performLaunchActivity (ActivityThread.java:1647)에서,210

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) android.app.ActivityThread.startActivityNow (ActivityThread.java:1487)에서

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) android.app.LocalActivityManager.moveToState (LocalActivityManager.java:127)에서

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345)에서 android.app.LocalActivityManager.startActivity (LocalActivityManager 된 .java : 339)

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345)에서 $ android.widget.TabHost IntentContentStrategy.getContentView (TabHost.java:654)

,691,363,210

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) android.widget.TabHost.setCurrentTab (TabHost.java:326)에서

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) : 01 : 52.040 : $ android.widget.TabHost 2.onTabSelectionChanged (TabHost.java:132)

03-15 00에서 E/AndroidRuntime (345)에서 android.widget.TabWidget $ TabClickListener.onClick (TabWidget.java:456)

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) android.view.View.performClick (View.java:2485)에서

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) : android.view.View $ PerformClick.run (View.java:9080)

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) : android.os.Handler. handleCallback (Handler.java:587)

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) : android.os.Handler.dispatchMessage (Handler.자바 92)

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) android.os.Looper.loop (Looper.java:123)

0시 1분 03-15에서 : 52.040 : E/AndroidRuntime (345) android.app.ActivityThread.main (ActivityThread.java:3683)에서

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345)에있는 java.lang.reflect .Method.invokeNative (원시 메소드)

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) java.lang.reflect.Method.invoke (Method.java:507)에서

-15 00 : 01 : 52.040 : E/AndroidRuntime (345) : com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run (ZygoteInit.java:839)

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) : at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:597)

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) : dalvik. system.NativeStart.main (원시 메소드)

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) java.lang.NullPointerException이

03-15 : 00 : 01 : 52.040을 의해 발생 : E/AndroidRuntime (345) : thisPackage.Tabs.ColorsActivity.onCreate (ColorsActivi ty.java:52)

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1047)

03-15에서 00 : 01 : 52.040 : E/AndroidRuntime (345) : android.app.ActivityThread.performLaunchActivity (ActivityThread.java:1611)

03-15 00 : 01 : 52.040 : E/AndroidRuntime (345) : ... 18 more

Answer 1

R.id.seekBarID는 R.layout.seekbarlist의 내용을 참조합니까? 당신은뿐만 아니라 2 개 레이아웃 파일을 게시 할 수있는 경우 그렇지 않은 경우 다음

SeekBar red = (SeekBar)findViewById(R.id.seekBarID); 

의지가 지정된를 찾을 수 없기 때문에 null을 반환 도움이 될 것입니다.