Question

我试图将图片视图放在适配器中。

我试图这样做是因为我看到了将一个 TextView 放在ArrayAdapter中的示例，如下所示：

  adapter = new ArrayAdapter<String>(this.getActivity(), android.R.layout.simple_list_item_1, transmit_noktp_list) {
         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
            View view = super.getView(position, convertView, parent);         
            TextView text = (TextView) view.findViewById(android.R.id.text1);     
            return view;
         }
      };

从示例中得出，然后我尝试将 ImageView 也用于实现icon＆amp;每个列表项上的文字：

试了一下：

  adapter = new ArrayAdapter<String>(this.getActivity(), android.R.layout.simple_list_item_1, transmit_noktp_list) {
         @Override
         public View getView(int position, View convertView, ViewGroup parent) {
            View view = super.getView(position, convertView, parent);
            ImageView img = (ImageView) view.findViewById(android.R.id.icon1);
            TextView text = (TextView) view.findViewById(android.R.id.text1);

            Resources resources = getResources();
            img.setImageDrawable(resources.getDrawable(R.drawable.inbox));

            return view;
         }
      };

令人惊讶的是，这条 img.setImageDrawable(resources.getDrawable(R.drawable.inbox)); 行给我一个例外（我可以保证＆＃39; 收件箱 ＆＃39;图标位于res/drawable，它甚至显示在我的IDE中：

E / AndroidRuntime：致命异常：主要过程：com.androidbelieve.drawerwithswipetabs，PID：24855 显示java.lang.NullPointerException 在 com.androidbelieve.drawerwithswipetabs.DaftarAspirasiFragment $ 1.getView（DaftarAspirasiFragment.java:55）在android.widget.AbsListView.obtainView（AbsListView.java:2263）在android.widget.ListView.makeAndAddView（ListView.java:1790）在android.widget.ListView.fillDown（ListView.java:691）在android.widget.ListView.fillFromTop（ListView.java:752）在android.widget.ListView.layoutChildren（ListView.java:1616）在android.widget.AbsListView.onLayout（AbsListView.java:2091）在android.view.View.layout（View.java:14817）在android.view.ViewGroup.layout（ViewGroup.java:4631）在android.widget.RelativeLayout.onLayout（RelativeLayout.java:1055）在android.view.View.layout（View.java:14817）在android.view.ViewGroup.layout（ViewGroup.java:4631）在android.support.v4.view.ViewPager.onLayout（ViewPager.java:1695）在android.view.View.layout（View.java:14817）在android.view.ViewGroup.layout（ViewGroup.java:4631）在android.widget.LinearLayout.setChildFrame（LinearLayout.java:1671）在android.widget.LinearLayout.layoutVertical（LinearLayout.java:1525）在android.widget.LinearLayout.onLayout（LinearLayout.java:1434）在android.view.View.layout（View.java:14817）在android.view.ViewGroup.layout（ViewGroup.java:4631）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:453）在android.widget.FrameLayout.onLayout（FrameLayout.java:388）在android.view.View.layout（View.java:14817）在android.view.ViewGroup.layout（ViewGroup.java:4631）在 android.support.v4.widget.DrawerLayout.onLayout（DrawerLayout.java:1187）在android.view.View.layout（View.java:14817）在android.view.ViewGroup.layout（ViewGroup.java:4631）在android.widget.LinearLayout.setChildFrame（LinearLayout.java:1671）在android.widget.LinearLayout.layoutVertical（LinearLayout.java:1525）在android.widget.LinearLayout.onLayout（LinearLayout.java:1434）在android.view.View.layout（View.java:14817）在android.view.ViewGroup.layout（ViewGroup.java:4631）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:453）在android.widget.FrameLayout.onLayout（FrameLayout.java:388）在android.view.View.layout（View.java:14817）在android.view.ViewGroup.layout（ViewGroup.java:4631）在 android.support.v7.widget.ActionBarOverlayLayout.onLayout（ActionBarOverlayLayout.java:435）在android.view.View.layout（View.java:14817）在android.view.ViewGroup.layout（ViewGroup.java:4631）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:453）在android.widget.FrameLayout.onLayout（FrameLayout.java:388）在android.view.View.layout（View.java:14817）在android.view.ViewGroup.layout（ViewGroup.java:4631）在android.widget.LinearLayout.setChildFrame（LinearLayout.java:1671）在android.widget.LinearLayout.layoutVertical（LinearLayout.java:1525）在android.widget.LinearLayout.onLayout（LinearLayout.java:1434）在android.view.View.layout（View.java:14817）在android.view.ViewGroup.layout（ViewGroup.java:4631）在android.widget.FrameLayout.layoutChildren（FrameLayout.java:453）在android.widget.FrameLayout.onLayout（FrameLayout.java:388）在android.view.View.layout（View.java:14817）在android.view.ViewGroup.layout（ViewGroup.java:4631）在android.view.ViewRootImpl.performLayout（ViewRootImpl.java:2011）在android.view.ViewRootImpl.performTraversals（ViewRootImpl.java:1768）在android.view.ViewRootImpl.doTraversal（ViewRootImpl.java:1024）在 android.view.ViewRootImpl $ TraversalRunnable.run（ViewRootImpl.java:5694）在 android.view.Choreographer $ CallbackRecord.run（Choreographer.java:761）在android.view.Choreographer.doCallbacks（Choreographer.java:574）在android.view.Choreographer.doFrame（Choreographer.java:544）在 android.view.Choreographer $ FrameDisplayEventReceiver.run（Choreographer.java:747）在android.os.Handler.handleCallback（Handler.java:733）在android.os.Handler.dispatchMessage（Handler.java:95）在android.os.Looper.loop（Looper.java:136）在android.app.ActivityThread.main（ActivityThread.java:5045）在java.lang.reflect。

Answer 1

而不是

 img.setImageDrawable(resources.getDrawable(R.drawable.inbox));

尝试img.setImageResource(R.drawable.inbox);

尝试将ImageView放入适配器

1 个答案: