数组适配器从Res文件夹加载图像（Android应用程序）

我是一个Android新手。 我试图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，我每次尝试使用gridView查看活动时都会崩溃。 我想知道如何设置我在res文件夹中的图像的imageResource以显示在Gridview中。

这是我的代码：

Smile.class

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); ArrayAdapteradapter = new ArrayAdapter (this,R.layout.grid_view_row,R.id.imageGrid , planets); gridView.setAdapter(adapter); } } 

Smile.xml

grid_view_row.xml（Gridview的自定义布局）

我的字符串数组（xml）

     @drawable/a @drawable/b @drawable/c @drawable/d   

logcat的

  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 

请帮忙。谢谢

Answer 1

您的问题的具体答案是您的适配器的构造函数是：

 (this,R.layout.grid_view_row,R.id.imageGrid , planets); 

R.layout.grid_view_row需要是一个只有TextView的xml文件。 它不能包含在其他任何东西中，如LinearLayout或RelativeLayout 。 所以你需要：

但是，如果要将图像加载到GridView我建议使用扩展BaseAdapter的“图像适配器”，然后从那里获取图像。 与此示例非常相似：

 public class ImageAdapter extends BaseAdapter { private Context mContext; public ImageAdapter(Context c) { mContext = c; } public int getCount() { return mThumbIds.length; } public Object getItem(int position) { return null; } public long getItemId(int position) { return 0; } // create a new ImageView for each item referenced by the Adapter public View getView(int position, View convertView, ViewGroup parent) { ImageView imageView; if (convertView == null) { // if it's not recycled, initialize some attributes imageView = new ImageView(mContext); imageView.setLayoutParams(new GridView.LayoutParams(85, 85)); imageView.setScaleType(ImageView.ScaleType.CENTER_CROP); imageView.setPadding(8, 8, 8, 8); } else { imageView = (ImageView) convertView; } imageView.setImageResource(mThumbIds[position]); return imageView; } // references to your images private Integer[] mThumbIds = { R.drawable.sample_2, R.drawable.sample_3, R.drawable.sample_4, R.drawable.sample_5, R.drawable.sample_6, R.drawable.sample_7, R.drawable.sample_0, R.drawable.sample_1, R.drawable.sample_2, R.drawable.sample_3, R.drawable.sample_4, R.drawable.sample_5, R.drawable.sample_6, R.drawable.sample_7, R.drawable.sample_0, R.drawable.sample_1, R.drawable.sample_2, R.drawable.sample_3, R.drawable.sample_4, R.drawable.sample_5, R.drawable.sample_6, R.drawable.sample_7 }; 

}

getView设置网格的外观， mThumbIds是你想要的每张图片的Array 。 从这里在您想要显示GridView的Activity中添加代码：

 gridview.setAdapter(new ImageAdapter(this)); 

Answer 2

问题是您尝试将String类型数据分配给ImageView 。 解决它的最简单方法是：

1. 将资源数组类型更改为整数数组

2. 而不是使用简单的ArrayAdapter与字符串数据，使用自定义适配器，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; } } 

这很简单。 最后一件事是将新适配器设置为gridView