오류 동안

Question

내 ListView에 4 일을 팽창하고

여백 넣기

2.Text

3.Text

4.Text (널 포인터 예외)

사용자 정의 어댑터가있는 메인 클래스 파일 ...

출처 :

ListView list_hashtag=null; 
private HashTag_Result mhashtag; 
private HashTag_Result_Adapter adapter; 

private ArrayList<HashTag_Result_Data > arr_list_data=new ArrayList<HashTag_Result_Data>(); 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_hash_tag_result); 

    list_hashtag=(ListView)findViewById(R.id.listview_hashtag); 
    Resources res=getResources(); 
    setListData(); 
    mhashtag=this; 
    adapter=new HashTag_Result_Adapter(mhashtag,arr_list_data,res); 
    list_hashtag.setAdapter(adapter); 


} 


private void setListData() { 

    DateFormat dformat=new SimpleDateFormat("dd-MM-yyyy"); 

    Date date=new Date(); 

    for(int i=0;i<30; i++) 
    { 
     final HashTag_Result_Data result_data=new HashTag_Result_Data(); 
     result_data.setImage("image" +i); 
     result_data.setName("User " +i); 
     result_data.setStatus("Lorem Lipsum is simply dummy text in typecasting and printing industry"); 
     result_data.setDate("Date is " +dformat.format(date)); 

     arr_list_data.add(result_data); 
    } 

} 
public void onItemClick(int position) 
{ 
    HashTag_Result_Data temp_values=(HashTag_Result_Data)arr_list_data.get(position); 
    Intent i=new Intent(getApplicationContext(),HashTag_Snap_Of_Day.class); 
    startActivity(i); 
    overridePendingTransition(R.anim.animation, R.anim.animation2); 
    finish(); 
} 

CustomAdapter :

public class HashTag_Result_Adapter extends BaseAdapter implements OnClickListener { 

Activity mactivity; 
Resources res1; 
ArrayList arr_list; 
int i=0; 
private static LayoutInflater l_inflater; 
HashTag_Result_Data result_data=null; 
public HashTag_Result_Adapter(Activity a,ArrayList arr_data,Resources res2) 
{ 
    mactivity=a; 
    arr_list=arr_data; 
    res1=res2; 
    l_inflater=(LayoutInflater)mactivity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
} 
@Override 
public int getCount() { 

    if(arr_list.size()<=0) 
    return 1; 
    return arr_list.size(); 
} 
@Override 
public Object getItem(int position) { 
    // TODO Auto-generated method stub 
    return position; 
} 
@Override 
public long getItemId(int position) { 
    // TODO Auto-generated method stub 
    return position; 
} 


public static class ViewHolder 
{ 
    public ImageView image1; 
    public TextView text1; 
    public TextView text2; 
    public TextView text3; 
} 
public View getView(int position, View convertView, ViewGroup parent) { 

    View vi=convertView; 
    ViewHolder holder; 
    if(convertView==null) 
    { 
     vi=l_inflater.inflate(R.layout.hashtag_result_listview_item, null); 
     holder=new ViewHolder(); 

     holder.image1=(ImageView)vi.findViewById(R.id.imageview_hashtag_result_item1); 
     holder.text1=(TextView)vi.findViewById(R.id.TextView_hashtag_result_item2); 
     holder.text2=(TextView)vi.findViewById(R.id.TextView_hashtag_result_item3); 
     holder.text3=(TextView)vi.findViewById(R.id.TextView_hashtag_result_item4); 

     vi.setTag(holder); 
    } 
    else 
     holder=(ViewHolder)vi.getTag(); 
    if(arr_list.size()<=0) 
    { 
     holder.text1.setText("Currently no item "); 
    } 
    else 
    { 
     result_data=null; 
     result_data=(HashTag_Result_Data)arr_list.get(position); 

     holder.image1.setImageResource(res1.getIdentifier("com.example.youthchat:drawable/"+result_data.getImage(),null,null)); 
     holder.text1.setText(result_data.getName()); 
     holder.text2.setText(result_data.getStatus()); 
     holder.text3.setText(result_data.getDate()); 

     vi.setOnClickListener(new OnItemClickListener(position)); 
    } 
    return vi; 
} 
@Override 
public void onClick(View v) { 


} 

private class OnItemClickListener implements OnClickListener{ 

    private int mpostion; 
    OnItemClickListener(int position) 
    { 
     mpostion=position; 
    } 
    @Override 
    public void onClick(View v) { 

     MainActivity mact=(MainActivity)mactivity; 
     mact.onItemClick(mpostion); 
} 

} 


} 

로그 캣 :

03-06 18:43:28.548: D/AndroidRuntime(14888): Shutting down VM 
03-06 18:43:28.548: W/dalvikvm(14888): threadid=1: thread exiting with uncaught     exception (group=0x40c341f8) 
03-06 18:43:28.548: E/AndroidRuntime(14888): FATAL EXCEPTION: main 
03-06 18:43:28.548: E/AndroidRuntime(14888): java.lang.RuntimeException: Unable to start activity  ComponentInfo{com.example.youthchat/com.example.youthchat.HashTag_Result}: java.lang.NullPointerException 
    03-06 18:43:28.548: E/AndroidRuntime(14888):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1968) 
03-06 18:43:28.548: E/AndroidRuntime(14888): at  android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1993) 
03-06 18:43:28.548: E/AndroidRuntime(14888): at android.app.ActivityThread.access$600(ActivityThread.java:127) 
03-06 18:43:28.548: E/AndroidRuntime(14888): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1159) 
03-06 18:43:28.548: E/AndroidRuntime(14888): at android.os.Handler.dispatchMessage(Handler.java:99) 
03-06 18:43:28.548: E/AndroidRuntime(14888): at android.os.Looper.loop(Looper.java:137) 
03-06 18:43:28.548: E/AndroidRuntime(14888): at android.app.ActivityThread.main(ActivityThread.java:4507) 
03-06 18:43:28.548: E/AndroidRuntime(14888): at java.lang.reflect.Method.invokeNative(Native Method) 
03-06 18:43:28.548: E/AndroidRuntime(14888): at java.lang.reflect.Method.invoke(Method.java:511) 
    03-06 18:43:28.548: E/AndroidRuntime(14888): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:978) 
    03-06 18:43:28.548: E/AndroidRuntime(14888): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:745) 
03-06 18:43:28.548: E/AndroidRuntime(14888): at dalvik.system.NativeStart.main(Native Method) 
    03-06 18:43:28.548: E/AndroidRuntime(14888): Caused by: java.lang.NullPointerException 
    03-06 18:43:28.548: E/AndroidRuntime(14888): at com.example.youthchat.HashTag_Result.onCreate(HashTag_Result.java:34) 
03-06 18:43:28.548: E/AndroidRuntime(14888): at android.app.Activity.performCreate(Activity.java:4469) 
    03-06 18:43:28.548: E/AndroidRuntime(14888): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1052) 
    03-06 18:43:28.548: E/AndroidRuntime(14888): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1932) 
     03-06 18:43:28.548: E/AndroidRuntime(14888):  ... 11 more 
    03-06 18:43:28.578: D/dalvikvm(14888): GC_CONCURRENT freed 774K, 13% free 8277K/9479K, paused 1ms+2ms 

Answer 1

내가이 문제를 해결하고 긴장에서 구호를 얻을해야 ... 이제 xml에 새로운 ID를 추가했습니다 ...

list_hashtag=(ListView)findViewById(R.id.listview_hashtag_result); 

및 그 좋은 ...

Answer 2

당신은 HashTag_Result에 Activity 변환을 시도하고에 전달하는 dapter 대신 당신은

list_hashtag=(ListView)findViewById(R.id.listview_hashtag); 

실제로 문제가 중복 ID로했다 ... 여기

문제입니다 ... 마지막으로

adapter=new HashTag_Result_Adapter(this,arr_list_data,res);