NullPointerException異常定製的ListView適配器

你好計算器社區，NullPointerException異常定製的ListView適配器

我得到一個NPE在一個延伸BaseAdapter我的自定義適配器類的我getView方法。我希望你能幫助我。

這裏是我的getView方法：

@Override 
public View getView(int pos, View convertView, ViewGroup viewGroup) { 
    if(convertView==null){ 
     LayoutInflater inflater = (LayoutInflater)context 
     .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     convertView = inflater.inflate(R.layout.row, null); 
    } 

    TextView datetv = (TextView) convertView.findViewById(R.id.date); 
    TextView valuetv = (TextView) convertView.findViewById(R.id.value); 
    TextView cattv = (TextView) convertView.findViewById(R.id.cat); 

    if(values.get(pos)>VALUE_MIN&&values.get(pos)<VALUE_MAX){ 
     datetv.setTextColor(context.getResources().getColor(R.color.Good)); 
     valuetv.setTextColor(context.getResources().getColor(R.color.Good)); 
     cattv.setTextColor(context.getResources().getColor(R.color.Good)); 
    } 
    else{ 
     datetv.setTextColor(context.getResources().getColor(R.color.Bad)); 
     valuetv.setTextColor(context.getResources().getColor(R.color.Bad)); 
     cattv.setTextColor(context.getResources().getColor(R.color.Bad)); 
    } 

    datetv.setText(dates.get(pos)); 
    valuetv.setText(Double.toString(values.get(pos))); 
    cattv.setText(cats.get(pos)); 

    LinearLayout l = (LinearLayout) convertView.findViewById(R.id.notelayout); 
    l.setFocusableInTouchMode(false); 
    l.setFocusable(false); 
    l.setOnClickListener(this); 
    l.setId(pos); 

    return convertView; 
}

這是row.xml：

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

> 
<LinearLayout 
    android:orientation="vertical" 
    android:layout_width="140dip" 
    android:layout_height="wrap_content" 
    android:padding="4dip" 
    > 
<TextView 
android:id="@+id/date" 
android:layout_width="fill_parent" 
android:layout_height="24dip" 
android:textSize="15dip" 
android:gravity="left" android:paddingLeft="6dip" 
android:layout_weight="1" /> 
<TextView 
android:id="@+id/cat" 
android:layout_width="fill_parent" 
android:layout_height="24dip" 
android:textSize="15dip" 
android:gravity="left" android:paddingLeft="6dip" 
android:layout_weight="1" /> 
</LinearLayout> 
<LinearLayout 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_weight="1" 
    android:gravity="center" 
    android:padding="4dip" 
    > 
    <TextView 
android:id="@+id/value" 
android:layout_width="fill_parent" 
android:layout_height="48dip" 
android:textSize="40dip" 
android:gravity="center" 
/> 
</LinearLayout> 
<LinearLayout 
    android:id="@+id/notelayout" 
    android:orientation="vertical" 
    android:layout_width="50dip" 
    android:layout_height="wrap_content" 
    android:gravity="right" 
    android:layout_gravity="center" 
    android:padding="4dip" 
    > 
<ImageView 
android:id="@+id/note" 
android:layout_width="wrap_content" 
android:layout_height="48dip" 
android:gravity="center" 
android:src="@drawable/papiertje" 
android:scaleType="centerInside"/> 
</LinearLayout> 
</LinearLayout>

這是我得到的錯誤：

01-30 00:34:31.772: ERROR/AndroidRuntime(497): FATAL EXCEPTION: main 
01-30 00:34:31.772: ERROR/AndroidRuntime(497): java.lang.NullPointerException 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at com.yellos.android.glucose.ListViewAdapter.getView(ListViewAdapter.java:85) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.widget.AbsListView.obtainView(AbsListView.java:1294) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.widget.ListView.measureHeightOfChildren(ListView.java:1198) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.widget.ListView.onMeasure(ListView.java:1109) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.view.View.measure(View.java:8171) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:696) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:306) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.view.View.measure(View.java:8171) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.widget.LinearLayout.measureVertical(LinearLayout.java:381) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.view.View.measure(View.java:8171) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.view.View.measure(View.java:8171) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.view.View.measure(View.java:8171) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.view.ViewRoot.performTraversals(ViewRoot.java:801) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.view.ViewRoot.handleMessage(ViewRoot.java:1727) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.os.Handler.dispatchMessage(Handler.java:99) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.os.Looper.loop(Looper.java:123) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at android.app.ActivityThread.main(ActivityThread.java:4627) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at java.lang.reflect.Method.invokeNative(Native Method) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at java.lang.reflect.Method.invoke(Method.java:521) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
01-30 00:34:31.772: ERROR/AndroidRuntime(497):  at dalvik.system.NativeStart.main(Native Method)

85號線是l.setFocusableInTouchMode(false);

來源

2012-01-29 Yellos

好像你的代碼是好的封閉，請嘗試清潔您的項目，刪除gen.R並再次運行它 – Rotemmiz 2012-01-30 00:05:50

刪除gen.R沒有幫助.. – Yellos 2012-01-30 00:28:59

getView（）

寫佈局充氣代碼刪除convertView == NULL的檢查條件的情況下直接內如果

來源

2012-01-30 10:08:04

NullPointerException異常定製的ListView適配器

回答

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