在ListView中显示TextView旁边的ImageView

所以我有一个显示正确的列表视图。当物品“开启”时，文字为白色，关闭时为灰色。这部分功能很好。但是，当我将ImageView添加到混合中时，我得到一个空指针异常。我不明白为什么。我也尝试使用位图，并得到相同的问题。在ListView中显示TextView旁边的ImageView

下面是一些代码：

@Override 
public void bindView(View view, Context context, Cursor cursor) { 

    TextView rRule = (TextView) view.findViewById(R.id.rule_text); 
    TextView rType = (TextView) view.findViewById(R.id.rule_type); 
    ImageView iChecked = (ImageView) view.findViewById(R.id.checkBox); 



    String ruleName = cursor.getString(1); 
    int ruleType = cursor.getInt(2); 
    String ruleEnabled = cursor.getString(3); 

    switch (ruleType) { 
    /*...some irrelevant code */ 

    } 

    if (ruleEnabled.equals("true")) { 
     rRule.setTypeface(null, Typeface.BOLD); 
     rRule.setTextColor(Color.WHITE); 
     iChecked.setVisibility(View.VISIBLE); //line 271 

    } else if (ruleEnabled.equals("false")) { 
     rRule.setTypeface(null, Typeface.NORMAL); 
     rRule.setTextColor(Color.GRAY); 
     iChecked.setVisibility(View.GONE); 

    } 
    rRule.setText(ruleName); 
}

每请求错误日志（对不起的印象是空指针不必说什么helpful..I知道错误是ImageView的下）

06-29 10:29:02.777: E/AndroidRuntime(29516): FATAL EXCEPTION: main 
06-29 10:29:02.777: E/AndroidRuntime(29516): java.lang.NullPointerException 
06-29 10:29:02.777: E/AndroidRuntime(29516): at com.company.app.DefaultRulesList$RulesAdapter.bindView(DefaultRulesList.java:271) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at com.company.app.DefaultRulesList$RulesAdapter.newView(DefaultRulesList.java:284) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.CursorAdapter.getView(CursorAdapter.java:246) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.AbsListView.obtainView(AbsListView.java:2033) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.ListView.makeAndAddView(ListView.java:1772) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.ListView.fillDown(ListView.java:672) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.ListView.fillFromTop(ListView.java:732) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.ListView.layoutChildren(ListView.java:1625) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.AbsListView.onLayout(AbsListView.java:1863) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.View.layout(View.java:11278) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewGroup.layout(ViewGroup.java:4224) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1486) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.LinearLayout.onLayout(LinearLayout.java:1399) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.View.layout(View.java:11278) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewGroup.layout(ViewGroup.java:4224) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.FrameLayout.onLayout(FrameLayout.java:431) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.View.layout(View.java:11278) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewGroup.layout(ViewGroup.java:4224) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1486) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.LinearLayout.onLayout(LinearLayout.java:1399) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.View.layout(View.java:11278) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewGroup.layout(ViewGroup.java:4224) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.FrameLayout.onLayout(FrameLayout.java:431) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.View.layout(View.java:11278) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewGroup.layout(ViewGroup.java:4224) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1489) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.os.Handler.dispatchMessage(Handler.java:99) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.os.Looper.loop(Looper.java:137) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at android.app.ActivityThread.main(ActivityThread.java:4424) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at java.lang.reflect.Method.invokeNative(Native Method) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at java.lang.reflect.Method.invoke(Method.java:511) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
06-29 10:29:02.777: E/AndroidRuntime(29516): at dalvik.system.NativeStart.main(Native Method)

代码iChecked（其中ID叫）

 <ImageView 
android:id="@+id/checkBox" 
android:padding="2dip" 
android:layout_width="wrap_content" 
android:layout_height="wrap_content" 
android:background="@android:drawable/checkbox_on_background"/>

来源

2012-06-29 KDEx

显示您的NewView的和row.xml –

确保您的ImageView的ID确实是“复选框” –

没有一个logcat的，很难说（IOW，发布的logcat显示碰撞吸：P）...你确定'R.id.checkBox'是正确的？ – Barak

它看起来像你对我一定是feedin g您的适配器错误的布局。

我可以看到没有其他原因的NPE的ImageView excpet它不存在于您寻找它的布局。

来源

2012-06-29 15:12:35 Barak

之一你说得很对，很遗憾我说它指向它错误的布局。我将imageview放在listlayout中，而不是rowlayout。再次感谢 – KDEx

在ListView中显示TextView旁边的ImageView

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