java - 阵列适配器从 Res 文件夹加载图像(Android 应用程序)

Question

我是一个 Android 新手。我正在尝试通过数组适配器将我的 res/Drawable 文件夹中的一堆图像加载到 Gridview 中。不幸的是，每次我尝试使用 gridView 查看 Activity 时，我的应用程序都会崩溃。我想知道如何设置 res 文件夹中图像的 imageResource 以在 Gridview 中显示。

这是我的代码:

微笑类

    public class Smiley extends Activity {
    GridView gridView;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.smile);
    gridView = (GridView) findViewById(R.id.gridView1);

    String planets[] = this.getResources().getStringArray(R.array.imageme);

     ArrayAdapter<String>adapter  = new  ArrayAdapter<String>  (this,R.layout.grid_view_row,R.id.imageGrid , planets);
     gridView.setAdapter(adapter);

   }    


  }

微笑.xml

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
  android:background="@drawable/blurred"
  >

     <GridView
     android:id="@+id/gridView1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
     android:columnWidth="90dp"
     android:numColumns="auto_fit"
     android:verticalSpacing="10dp"
     android:horizontalSpacing="10dp"
     android:stretchMode="columnWidth"
     android:gravity="center"
     >
    </GridView>

 </RelativeLayout>

grid_view_row.xml(Gridview 的自定义布局)

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

    <ImageView
    android:id="@+id/imageGrid"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
     android:padding="2dp"
    android:src="@drawable/a"
     />

  </FrameLayout> 

我的字符串数组(xml)

   <?xml version="1.0" encoding="utf-8"?>
    <resources>
   <string-array name="imageme">
   <item>@drawable/a</item>   
   <item>@drawable/b</item> 
   <item>@drawable/c</item> 
   <item>@drawable/d</item>  

   </string-array>

   </resources>

日志

    09-04 16:48:40.561: E/ArrayAdapter(25938): You must supply a resource ID for a           TextView
      09-04 16:48:40.568: E/AndroidRuntime(25938): FATAL EXCEPTION: main
         09-04 16:48:40.568: E/AndroidRuntime(25938): java.lang.IllegalStateException:  ArrayAdapter requires the resource ID to be a TextView
        09-04 16:48:40.568: E/AndroidRuntime(25938):    at     android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:386)
         09-04 16:48:40.568: E/AndroidRuntime(25938):   at      android.widget.ArrayAdapter.getView(ArrayAdapter.java:362)
      09-04 16:48:40.568: E/AndroidRuntime(25938):  at android.widget.AbsListView.obtainView(AbsListView.java:2207)
      09-04 16:48:40.568: E/AndroidRuntime(25938):  at android.widget.GridView.onMeasure(GridView.java:1040)
    09-04 16:48:40.568: E/AndroidRuntime(25938):    at android.view.View.measure(View.java:15609)
     09-04 16:48:40.568: E/AndroidRuntime(25938):   at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:645)
        09-04 16:48:40.568: E/AndroidRuntime(25938):    at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:425)
        09-04 16:48:40.568: E/AndroidRuntime(25938):    at android.view.View.measure(View.java:15609)
      09-04 16:48:40.568: E/AndroidRuntime(25938):  at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916)
     09-04 16:48:40.568: E/AndroidRuntime(25938):   at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
       09-04 16:48:40.568: E/AndroidRuntime(25938):     at android.view.View.measure(View.java:15609)
       09-04 16:48:40.568: E/AndroidRuntime(25938):     at android.widget.LinearLayout.measureVertical(LinearLayout.java:850)
     09-04 16:48:40.568: E/AndroidRuntime(25938):   at android.widget.LinearLayout.onMeasure(LinearLayout.java:588)
     09-04 16:48:40.568: E/AndroidRuntime(25938):   at android.view.View.measure(View.java:15609)
       09-04 16:48:40.568: E/AndroidRuntime(25938):     at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4916)
       09-04 16:48:40.568: E/AndroidRuntime(25938):     at android.widget.FrameLayout.onMeasure(FrameLayout.java:310)
  09-04 16:48:40.568: E/AndroidRuntime(25938):  at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2203)
    09-04 16:48:40.568: E/AndroidRuntime(25938):    at android.view.View.measure(View.java:15609)
   09-04 16:48:40.568: E/AndroidRuntime(25938):     at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2165)
      09-04 16:48:40.568: E/AndroidRuntime(25938):  at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1249)
     09-04 16:48:40.568: E/AndroidRuntime(25938):   at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1443)
    09-04 16:48:40.568: E/AndroidRuntime(25938):    at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1139)
   09-04 16:48:40.568: E/AndroidRuntime(25938):     at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4879)
  09-04 16:48:40.568: E/AndroidRuntime(25938):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:776)
     09-04 16:48:40.568: E/AndroidRuntime(25938):   at android.view.Choreographer.doCallbacks(Choreographer.java:579)
  09-04 16:48:40.568: E/AndroidRuntime(25938):  at android.view.Choreographer.doFrame(Choreographer.java:548)
   09-04 16:48:40.568: E/AndroidRuntime(25938):     at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:762)
   09-04 16:48:40.568: E/AndroidRuntime(25938):     at android.os.Handler.handleCallback(Handler.java:725)
     09-04 16:48:40.568: E/AndroidRuntime(25938):   at android.os.Handler.dispatchMessage(Handler.java:92)
       09-04 16:48:40.568: E/AndroidRuntime(25938):     at android.os.Looper.loop(Looper.java:153)
  09-04 16:48:40.568: E/AndroidRuntime(25938):  at android.app.ActivityThread.main(ActivityThread.java:5297)
     09-04 16:48:40.568: E/AndroidRuntime(25938):   at java.lang.reflect.Method.invokeNative(Native Method)
     09-04 16:48:40.568: E/AndroidRuntime(25938):   at java.lang.reflect.Method.invoke(Method.java:511)
    09-04 16:48:40.568: E/AndroidRuntime(25938):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:833)
        09-04 16:48:40.568: E/AndroidRuntime(25938):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
    09-04 16:48:40.568: E/AndroidRuntime(25938):    at dalvik.system.NativeStart.main(Native Method)
  09-04 16:48:40.568: E/AndroidRuntime(25938): Caused by: java.lang.ClassCastException: android.widget.ImageView cannot be cast to android.widget.TextView
   09-04 16:48:40.568: E/AndroidRuntime(25938):     at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:382)
     09-04 16:48:40.568: E/AndroidRuntime(25938):   ... 35 more

请帮助。谢谢

Answer 1

问题是您试图将字符串类型的数据分配给 ImageView。最简单的修复方法是:

1. 将资源数组类型更改为整型数组

2. 不要对字符串数据使用简单的 ArrayAdapter，而是使用自定义适配器，例如:

   class ImgAdapter extends BaseAdapter {
   @Override
   public int getCount() {
       return planets.length;
   }
   
   @Override
   public Integer getItem(final int position) {
       return planets[position];
   }
   
   @Override
   public long getItemId(final int position) {
       return position;
   }
   
   @Override
   public View getView(final int position, final View convertView, final ViewGroup parent) {
       final View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.grid_view_row, null);
       ImageView imageView = (ImageView) view.findViewById(R.id.imageGrid);
       imageView.setImageResource(getItem(position));
       return view;
   }
   }
   

那就简单了。最后一件事是将新适配器设置为 gridView