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我在尝试创建 ImageAdapter 时遇到了一些问题。老实说，我不确定我是否会以最好的方式去做。我的/assets文件夹中有 20 张图片。String我有一个格式的这些文件名的数组。我只是想在我的一个对话框条目中创建一个下拉菜单 ( Spinner)，以便人们选择其中一个图像（不是按名称，而是按实际图像）。我在下面提供了与我要执行的操作相关的所有代码。任何帮助将不胜感激。稍后我将需要知道为不同的图像选择了哪个图像，ListAdapter我必须显示数据。

编辑：修复了第一个错误。使用了错误的 findViewById。当我尝试按下下拉菜单时，它现在崩溃了。我对ArrayAdapter 下面的 LogCat不太熟悉

package cs.ucsb.cs185.dimberman.lifeRPG;

import java.util.ArrayList;

import android.app.Activity;
import android.content.Context;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;

public class ImageAdapter extends ArrayAdapter<String> {
    int layoutResourceId;
    public static final String CONTENT_URI = "content://cs.ucsb.cs185.dimberman.lifeRPG.assets.";

    public ImageAdapter(Context context, int layoutResourceId, String[] icons) {
        super(context, layoutResourceId, icons);
        this.layoutResourceId = layoutResourceId;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = convertView;
        ItemHolder holder = null;

        if(row == null) {
            LayoutInflater inflater = ((Activity)parent.getContext()).getLayoutInflater();
            row = inflater.inflate(layoutResourceId, parent, false);
            holder = new ItemHolder();
            holder.image = (ImageView)row.findViewById(R.id.list_image);
            row.setTag(holder);
        } else {
            holder = (ItemHolder)row.getTag();
        }

        final String s = getItem(position);
        holder.image.setImageURI(Uri.parse(CONTENT_URI + s));
        return row;
    }

    static class ItemHolder{
        ImageView image;
    }
}

对话框生成器

private String [] icons = {
    "airplane.png", "bang.png", "drive_copy.png", "email.png", "heart.png", "kingOfWorld.png", 
    "leafy_outdoors.png", "miscellaneous_blob.png", "music.png", "outdoors.png", "paperclip.png",
    "pencil.png", "person.png", "pet.png", "radioactive.png", "shop.png", "star.png", "talk.png",
    "telephone.png", "thumbtack.png"
};

AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle(R.string.add_activity);

final View v2 = this.getLayoutInflater().inflate(R.layout.add_button_layout, null);

ImageAdapter adapter2 = new ImageAdapter(this, R.layout.image_drop_down_view, icons);

Spinner imageList = (Spinner) findViewById(R.id.addActivityImageText);
imageList.setAdapter(adapter2);
// ...

简单图像项的 XML

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

    <ImageView 
        android:id="@+id/list_image"
        android:layout_width="50dip"
        android:layout_height="50dip"
        android:contentDescription=""
        />


</LinearLayout>

警报生成器的 XML

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" 
    android:padding="6dp" >

    <LinearLayout 
        android:id="@+id/row0ForDialog"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" 
        android:weightSum="16">

        <TextView
                android:id="@+id/addActivityImageLabel"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:paddingTop="8dp"
                android:paddingLeft="8dp"
                android:text="@string/add_activity_image"
                android:gravity="left"
                android:layout_weight="5"
                android:textAppearance="?android:attr/textAppearanceLarge" />

        <Spinner
            android:id ="@+id/addActivityImageText"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:paddingTop="8dp"
            android:paddingRight="8dp"
            android:layout_weight="11" 
            android:inputType="text" />

    </LinearLayout>
</LinearLayout>

LogCat 崩溃

06-05 17:21:27.346: E/AndroidRuntime(1843): FATAL EXCEPTION: main
06-05 17:21:27.346: E/AndroidRuntime(1843): java.lang.IllegalStateException: Could not execute method of the activity
06-05 17:21:27.346: E/AndroidRuntime(1843):     at android.view.View$1.onClick(View.java:3597)
06-05 17:21:27.346: E/AndroidRuntime(1843):     at android.view.View.performClick(View.java:4202)
06-05 17:21:27.346: E/AndroidRuntime(1843):     at android.view.View$PerformClick.run(View.java:17340)
06-05 17:21:27.346: E/AndroidRuntime(1843):     at android.os.Handler.handleCallback(Handler.java:725)
06-05 17:21:27.346: E/AndroidRuntime(1843):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-05 17:21:27.346: E/AndroidRuntime(1843):     at android.os.Looper.loop(Looper.java:137)
06-05 17:21:27.346: E/AndroidRuntime(1843):     at android.app.ActivityThread.main(ActivityThread.java:5039)
06-05 17:21:27.346: E/AndroidRuntime(1843):     at java.lang.reflect.Method.invokeNative(Native Method)
06-05 17:21:27.346: E/AndroidRuntime(1843):     at java.lang.reflect.Method.invoke(Method.java:511)
06-05 17:21:27.346: E/AndroidRuntime(1843):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-05 17:21:27.346: E/AndroidRuntime(1843):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-05 17:21:27.346: E/AndroidRuntime(1843):     at dalvik.system.NativeStart.main(Native Method)
06-05 17:21:27.346: E/AndroidRuntime(1843): Caused by: java.lang.reflect.InvocationTargetException
06-05 17:21:27.346: E/AndroidRuntime(1843):     at java.lang.reflect.Method.invokeNative(Native Method)
06-05 17:21:27.346: E/AndroidRuntime(1843):     at java.lang.reflect.Method.invoke(Method.java:511)
06-05 17:21:27.346: E/AndroidRuntime(1843):     at android.view.View$1.onClick(View.java:3592)
06-05 17:21:27.346: E/AndroidRuntime(1843):     ... 11 more
06-05 17:21:27.346: E/AndroidRuntime(1843): Caused by: java.lang.NullPointerException
06-05 17:21:27.346: E/AndroidRuntime(1843):     at cs.ucsb.cs185.dimberman.lifeRPG.LifeRpgMain.listAdd(LifeRpgMain.java:159)
06-05 17:21:27.346: E/AndroidRuntime(1843):     ... 14 more
06-05 17:26:27.660: E/Trace(1875): error opening trace file: No such file or directory (2)

编辑：第二个错误的 LogCat

06-05 17:35:35.719: E/AndroidRuntime(1949): FATAL EXCEPTION: main
06-05 17:35:35.719: E/AndroidRuntime(1949): java.lang.IllegalStateException: ArrayAdapter requires the resource ID to be a TextView
06-05 17:35:35.719: E/AndroidRuntime(1949):     at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:386)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at android.widget.ArrayAdapter.getDropDownView(ArrayAdapter.java:415)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at android.widget.Spinner$DropDownAdapter.getDropDownView(Spinner.java:737)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at android.widget.Spinner$DropDownAdapter.getView(Spinner.java:733)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at android.widget.Spinner.measureContentWidth(Spinner.java:681)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at android.widget.Spinner$DropdownPopup.show(Spinner.java:959)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at android.widget.Spinner.performClick(Spinner.java:609)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at android.view.View$PerformClick.run(View.java:17340)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at android.os.Handler.handleCallback(Handler.java:725)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at android.os.Handler.dispatchMessage(Handler.java:92)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at android.os.Looper.loop(Looper.java:137)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at android.app.ActivityThread.main(ActivityThread.java:5039)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at java.lang.reflect.Method.invokeNative(Native Method)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at java.lang.reflect.Method.invoke(Method.java:511)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
06-05 17:35:35.719: E/AndroidRuntime(1949):     at dalvik.system.NativeStart.main(Native Method)
06-05 17:35:35.719: E/AndroidRuntime(1949): Caused by: java.lang.ClassCastException: android.widget.LinearLayout cannot be cast to android.widget.TextView
06-05 17:35:35.719: E/AndroidRuntime(1949):     at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:379)
06-05 17:35:35.719: E/AndroidRuntime(1949):     ... 16 more
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1 回答 1

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如果 Spinner 在内部DialogBox布局 (in add_button_layout) 中，则将其初始化为：

Spinner imageList = (Spinner)v2. findViewById(R.id.addActivityImageText);
于 2013-06-05T17:33:11.250 回答