第一行代码 listview 出现报错，怎么解决？ - 知否问答 - 万象云+社区

public class MainActivity extends AppCompatActivity { private List<Fruit> fruitList = new ArrayList<>(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initFruits(); FruitAdapter arrayAdapter = new FruitAdapter(MainActivity.this,R.layout.fruit_item,fruitList); ListView listView = (ListView) findViewById(R.id.listview); listView.setAdapter(arrayAdapter); } private void initFruits(){ for( int i =0; i<2;i++){ Fruit apple = new Fruit("Apple",R.drawable.apple_pic); fruitList.add(apple); Fruit banana = new Fruit("Banana",R.drawable.banana_pic); fruitList.add(banana); Fruit orange = new Fruit("Orange",R.drawable.orange_pic); fruitList.add(orange); Fruit watermelon = new Fruit("Watermelon",R.drawable.watermelon_pic); fruitList.add(watermelon); Fruit pear = new Fruit("Pear",R.drawable.pear_pic); fruitList.add(pear); Fruit grape = new Fruit("Grape",R.drawable.grape_pic); fruitList.add(grape); Fruit pineapple = new Fruit("Pineapple",R.drawable.pineapple_pic); fruitList.add(pineapple); Fruit strawberry = new Fruit("Strawberry",R.drawable.strawberry_pic); fruitList.add(strawberry); Fruit cherry = new Fruit("Cherry",R.drawable.cherry_pic); fruitList.add(cherry); Fruit mango = new Fruit("Mango",R.drawable.mango_pic); fruitList.add(mango); } } }

public class FruitAdapter extends ArrayAdapter<Fruit> { private int resourseId; public FruitAdapter(Context context, int textViewResourceId, List<Fruit> objects){ super(context,textViewResourceId,objects); resourseId = textViewResourceId; } public View getview(int position, View ConvertView, ViewGroup parent){ Fruit fruit = getItem(position); View view= LayoutInflater.from(getContext()).inflate(resourseId,parent,false); ImageView fruitImage = (ImageView) view.findViewById(R.id.fruit_image); TextView fruitName =(TextView) view.findViewById(R.id.fruitname); fruitImage.setImageResource(fruit.getImageId()); fruitName.setText(fruit.getName()); return view; } }

public class Fruit { private String name; private int imageId; public Fruit (String name,int imageId){ this.name = name; this.imageId = imageId; } public String getName() { return name; } public int getImageId() { return imageId; } }

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" tools:context=".MainActivity"> <ListView android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/listview"></ListView> </LinearLayout>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal"> <ImageView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/fruit_image"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/fruitname" android:layout_gravity="center_vertical" android:layout_marginLeft="10dp"/> </LinearLayout>

Process: com.example.hwy01.listviewtest, PID: 25459 java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:445) at android.widget.ArrayAdapter.getView(ArrayAdapter.java:415) at android.widget.AbsListView.obtainView(AbsListView.java:2366) at android.widget.ListView.makeAndAddView(ListView.java:2052) at android.widget.ListView.fillDown(ListView.java:786) at android.widget.ListView.fillFromTop(ListView.java:847) at android.widget.ListView.layoutChildren(ListView.java:1826) at android.widget.AbsListView.onLayout(AbsListView.java:2165) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656) at android.widget.LinearLayout.onLayout(LinearLayout.java:1565) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:443) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656) at android.widget.LinearLayout.onLayout(LinearLayout.java:1565) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at com.android.internal.policy.DecorView.onLayout(DecorView.java:753) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2767) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2294) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1447) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7130) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:935) at android.view.Choreographer.doCallbacks(Choreographer.java:747) at android.view.Choreographer.doFrame(Choreographer.java:682) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:921) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6642) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) Caused by: java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:432) at android.widget.ArrayAdapter.getView(ArrayAdapter.java:415) at android.widget.AbsListView.obtainView(AbsListView.java:2366) at android.widget.ListView.makeAndAddView(ListView.java:2052) at android.widget.ListView.fillDown(ListView.java:786) at android.widget.ListView.fillFromTop(ListView.java:847) at android.widget.ListView.layoutChildren(ListView.java:1826) at android.widget.AbsListView.onLayout(AbsListView.java:2165) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656) at android.widget.LinearLayout.onLayout(LinearLayout.java:1565) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:443) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656) at android.widget.LinearLayout.onLayout(LinearLayout.java:1565) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at com.android.internal.policy.DecorView.onLayout(DecorView.java:753) at android.view.View.layout(View.java:20670) at android.view.ViewGroup.layout(ViewGroup.java:6194) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2767) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2294) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1447) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7130) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:935) at android.view.Choreographer.doCallbacks(Choreographer.java:747) at android.view.Choreographer.doFrame(Choreographer.java:682) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:921) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6642) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

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