アンドロイドButterKnifeにNullPointer私は私のCustomAdapterクラスのレイアウトコンポーネントをバインドしようCustomAdapter

に結合に対する、私はこのようなビューコンポーネントに私のホルダーコンストラクタにButterKnife、およびBindViewをバインドしていますアンドロイドButterKnifeにNullPointer私は私のCustomAdapterクラスのレイアウトコンポーネントをバインドしようCustomAdapter

public static class Holder 
{ 

    public Holder(View view) 
    { 
     ButterKnife.bind(this,view); 
    } 

    @BindView(R.id.txtName) 
    TextView tvName; 

    @BindView(R.id.txtGroup) 
    TextView tvGroup; 

    @BindView(R.id.imageProfile) 
    ImageView img; 
}

と、このGetViewメソッドです：

FATAL EXCEPTION: main 
              Process: com.project.echo.contactmanagement, PID: 2861 
              java.lang.RuntimeException: Unable to bind views for com.project.echo.contactmanagement.mainscreen.CustomAdapter$Holder 
               at butterknife.ButterKnife.bind(ButterKnife.java:189) 
               at butterknife.ButterKnife.bind(ButterKnife.java:167) 
               at com.project.echo.contactmanagement.mainscreen.CustomAdapter$Holder.<init>(CustomAdapter.java:61) 
               at com.project.echo.contactmanagement.mainscreen.CustomAdapter.getView(CustomAdapter.java:76) 
               at android.widget.AbsListView.obtainView(AbsListView.java:2263) 
               at android.widget.ListView.makeAndAddView(ListView.java:1790) 
               at android.widget.ListView.fillDown(ListView.java:691) 
               at android.widget.ListView.fillFromTop(ListView.java:752) 
               at android.widget.ListView.layoutChildren(ListView.java:1630) 
               at android.widget.AbsListView.onLayout(AbsListView.java:2091) 
               at android.view.View.layout(View.java:14852) 
               at android.view.ViewGroup.layout(ViewGroup.java:4631) 
               at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1055) 
               at android.view.View.layout(View.java:14852) 
               at android.view.ViewGroup.layout(ViewGroup.java:4631) 
               at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) 
               at android.widget.FrameLayout.onLayout(FrameLayout.java:388) 
               at android.view.View.layout(View.java:14852) 
               at android.view.ViewGroup.layout(ViewGroup.java:4631) 
               at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:437) 
               at android.view.View.layout(View.java:14852) 
               at android.view.ViewGroup.layout(ViewGroup.java:4631) 
               at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) 
               at android.widget.FrameLayout.onLayout(FrameLayout.java:388) 
               at android.view.View.layout(View.java:14852) 
               at android.view.ViewGroup.layout(ViewGroup.java:4631) 
               at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671) 
               at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525) 
               at android.widget.LinearLayout.onLayout(LinearLayout.java:1434) 
               at android.view.View.layout(View.java:14852) 
               at android.view.ViewGroup.layout(ViewGroup.java:4631) 
               at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453) 
               at android.widget.FrameLayout.onLayout(FrameLayout.java:388) 
               at android.view.View.layout(View.java:14852) 
               at android.view.ViewGroup.layout(ViewGroup.java:4631) 
               at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1994) 
               at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1751) 
               at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1007) 
               at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5677) 
               at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761) 
               at android.view.Choreographer.doCallbacks(Choreographer.java:574) 
               at android.view.Choreographer.doFrame(Choreographer.java:544) 
               at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747) 
               at android.os.Handler.handleCallback(Handler.java:733) 
               at android.os.Handler.dispatchMessage(Handler.java:95) 
               at android.os.Looper.loop(Looper.java:136) 
               at android.app.ActivityThread.main(ActivityThread.java:5021) 
               at java.lang.reflect.Method.invokeNative(Native Method) 
               at java.lang.reflect.Method.invoke(Method.java:515) 
               at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:827) 
               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643) 
               at dalvik.system.NativeStart.main(Native Method) 
               Caused by: java.lang.NullPointerException 
               at butterknife.internal.Finder$1.findView(Finder.java:12) 
               at butterknife.internal.Finder.findOptionalView(Finder.java:64) 
               at butterknife.internal.Finder.findRequiredView(Finder.java:48) 
               at com.project.echo.contactmanagement.mainscreen.CustomAdapter$Holder$$ViewBinder.bind(CustomAdapter$Holder$$ViewBinder.java:17) 
               at com.project.echo.contactmanagement.mainscreen.CustomAdapter$Holder$$ViewBinder.bind(CustomAdapter$Holder$$ViewBinder.java:12) 
               at butterknife.ButterKnife.bind(ButterKnife.java:187) 
               at butterknife.ButterKnife.bind(ButterKnife.java:167)  
               at com.project.echo.contactmanagement.mainscreen.CustomAdapter$Holder.<init>(CustomAdapter.java:61)  
               at com.project.echo.contactmanagement.mainscreen.CustomAdapter.getView(CustomAdapter.java:76)  
               at android.widget.AbsListView.obtainView(AbsListView.java:2263)  
               at android.widget.ListView.makeAndAddView(ListView.java:1790)  
               at android.widget.ListView.fillDown(ListView.java:691)  
               at android.widget.ListView.fillFromTop(ListView.java:752)  
               at android.widget.ListView.layoutChildren(ListView.java:1630)  
               at android.widget.AbsListView.onLayout(AbsListView.java:2091)  
               at android.view.View.layout(View.java:14852)  
               at android.view.ViewGroup.layout(ViewGroup.java:4631)  
               at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1055)  
               at android.view.View.layout(View.java:14852)  
               at android.view.ViewGroup.layout(ViewGroup.java:4631)  
               at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)  
               at android.widget.FrameLayout.onLayout(FrameLayout.java:388)  
               at android.view.View.layout(View.java:14852)  
               at android.view.ViewGroup.layout(ViewGroup.java:4631)  
               at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:437)  
               at android.view.View.layout(View.java:14852)  
               at android.view.ViewGroup.layout(ViewGroup.java:4631)  
               at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)  
               at android.widget.FrameLayout.onLayout(FrameLayout.java:388)  
               at android.view.View.layout(View.java:14852)  
               at android.view.ViewGroup.layout(ViewGroup.java:4631)  
               at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1671)  
               at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1525)  
               at android.widget.LinearLayout.onLayout(LinearLayout.java:1434)  
               at android.view.View.layout(View.java:14852)  
               at android.view.ViewGroup.layout(ViewGroup.java:4631)  
               at android.widget.FrameLayout.layoutChildren(FrameLayout.java:453)  
               at android.widget.FrameLayout.onLayout(FrameLayout.java:388)  
               at android.view.View.layout(View.java:14852)  
               at android.view.ViewGroup.layout(ViewGroup.java:4631)  
               at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1994)  
               at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1751)  
               at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1007)  
               at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5677)  
               at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)  
               at android.view.Choreographer.doCallbacks(Choreographer.java:574)  
               at android.view.Choreographer.doFrame(Choreographer.java:544)  
               at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:747)  
               at android.os.Handler.handleCallback(Handler.java:733)  
               at android.os.Handler.dispatchMessage(Handler.java:95)  
               at android.os.Looper.loop(Looper.java:136)  
               at android.app.ActivityThread.main(ActivityThread.java:5021)  
               at java.lang.reflect.Method.invokeNative(Native Method)  
               at java.lang.reflect.Method.invoke(Method.java:515)  
               at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:827)  
               at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:643)  
               at dalvik.system.NativeStart.main(Native Method)

：

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 
    Holder holder=new Holder(convertView); 
    View rowView; 
    rowView = inflater.inflate(R.layout.contact_list, null); 

    //holder.tvName=(TextView)rowView.findViewById(R.id.txtName); 
    holder.tvName.setText(result.get(position)); 
    //holder.img=(ImageView) rowView.findViewById(R.id.imageProfile); 
    holder.img.setImageBitmap(imageId.get(position)); 
    //holder.tvGroup=(TextView)rowView.findViewById(R.id.txtGroup); 
    holder.tvGroup.setText(listGroup.get(position)); 
    rowView.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      Toast.makeText(context, "You Clicked "+result.get(position), Toast.LENGTH_LONG).show(); 
     } 
    }); 
    return rowView; 
}

しかし、私はそれを実行すると、それはNullPointerExceptionが引き金、これはメッセージであります

誰でもこの問題で私を助けることができますか？

出典

2016-12-09 user1290932

をエラーが 'ホルダーホルダーは=新しいホルダー（ですconvertView） 'を実行します。あなたは 'convertView'がnullではないと確信していますか？ –

convertViewがnullのため、RowViewを作成する必要はありません。変換ビューを拡張するだけです。

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 
    final Holder holder; 
    if (null == convertView) { 
     convertView = inflater.inflate(R.layout.contact_list, null); 
     holder = new Holder(convertView); 
     convertView.setTag(holder); 
    } else { 
     holder = (Holder) convertView.getTag(); 
    } 

    //holder.tvName=(TextView)rowView.findViewById(R.id.txtName); 
    holder.tvName.setText(result.get(position)); 
    //holder.img=(ImageView) rowView.findViewById(R.id.imageProfile); 
    holder.img.setImageBitmap(imageId.get(position)); 
    //holder.tvGroup=(TextView)rowView.findViewById(R.id.txtGroup); 
    holder.tvGroup.setText(listGroup.get(position)); 
    rowView.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      Toast.makeText(context, "You Clicked "+result.get(position), Toast.LENGTH_LONG).show(); 
     } 
    }); 
    return convertView; 
}

しかし、私はあなたがListViewを置き換えるためにRecyclerViewを使用することをお勧め、RecyclerViewはViewHolderを作成していないViewHolderとあなたの必要性を作成しています。

REF：https://developer.android.com/reference/android/support/v7/widget/RecyclerView.html

出典

2016-12-09 06:12:29 Yat3s

''しかし、RecyclerViewを使用してListViewを置き換えることをお勧めします。RecyclerViewはViewHolderを作成し、ViewHolderを作成する必要はありません。 ''そしてButterKnifeの代わりに 'databinding'ライブラリを使用します。 – pskink

@pskinkはい、オプションです。 – Yat3s

ButterKnife.bind（この、convertView）。

出典

2016-12-09 06:18:46

convertViewがnullである、と私はこれに私のコードを変更し、それが最終的に動作しますので、うん、私は、それを考えるのを助けるためにあなたのすべてに感謝：

@Override 
public View getView(final int position, View convertView, ViewGroup parent) { 

    View rowView; 
    rowView = inflater.inflate(R.layout.contact_list, null); 
    Holder holder=new Holder(rowView); 

    holder.tvName.setText(result.get(position)); 
    holder.img.setImageBitmap(imageId.get(position)); 
    holder.tvGroup.setText(listGroup.get(position)); 
    rowView.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
      Toast.makeText(context, "You Clicked "+result.get(position), Toast.LENGTH_LONG).show(); 
     } 
    }); 
    return rowView; 
}

出典

2016-12-09 06:45:50 user1290932

アンドロイドButterKnifeにNullPointer私は私のCustomAdapterクラスのレイアウトコンポーネントをバインドしようCustomAdapter

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