对话框中的java Android gallery视图导致nullpointerexception
所以我在其他地方使用了下面的代码，它工作得很好，但现在我想在警报对话框中使用它。问题是，无论何时设置适配器，都会导致nullpointerexception。代码（不包括alertdialog）在这里的开发教程中几乎没有问题： http://developer.安卓.com/resources/tutorials/views/hello-gallery.html
如果我把这句话注释掉： 陈列室setAdapter（新的ImageAdapter（本））； 对话框可以正常打开，但设置适配器的那一刻会导致错误。有什么想法吗
以下是我的alertdialog的代码：
private void statusbarCustom() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
View view = LayoutInflater.from(this).inflate(R.layout.custom_icon, null);
final EditText cTitle = (EditText)view.findViewById(R.id.search_term);
Gallery gallery = (Gallery) findViewById(R.id.gallery);
gallery.setAdapter(new ImageAdapter(this));
builder.setView(view);
builder.setPositiveButton("Continue", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
});
builder.setNegativeButton("Cancel", new OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
AlertDialog alertDialog = builder.create();
alertDialog.setTitle("Statusbar");
alertDialog.show();
}
以下是imageadapter代码：
public class ImageAdapter extends BaseAdapter {
int mGalleryItemBackground;
private Context mContext;
private Integer[] mImageIds = {
R.drawable.attach,
R.drawable.bell,
R.drawable.book_addresses,
R.drawable.book,
R.drawable.cake,
R.drawable.calculator,
R.drawable.calendar,
R.drawable.camera,
R.drawable.car,
R.drawable.cart,
R.drawable.chart_curve,
R.drawable.chart_pie_edit,
R.drawable.clock_,
R.drawable.computer,
R.drawable.controller,
R.drawable.cup,
R.drawable.date,
R.drawable.emotion_evilgrin,
R.drawable.emotion_grin,
R.drawable.emotion_happy,
R.drawable.emotion_smile,
R.drawable.emotion_suprised,
R.drawable.emotion_tongue,
R.drawable.emotion_unhappy,
R.drawable.emotion_waii,
R.drawable.emotion_wink,
R.drawable.exclamation,
R.drawable.film,
R.drawable.folder,
R.drawable.group,
R.drawable.heart,
R.drawable.house,
R.drawable.key,
R.drawable.lightbulb,
R.drawable.lightning,
R.drawable.lock,
R.drawable.lorry,
R.drawable.map,
R.drawable.money_euro,
R.drawable.money_pound,
R.drawable.money_yen,
R.drawable.money,
R.drawable.shop,
R.drawable.compass,
R.drawable.sofa,
R.drawable.gift,
R.drawable.smartphone,
R.drawable.accept,
R.drawable.add,
R.drawable.sound_none,
R.drawable.newspaper,
R.drawable.painbrush,
R.drawable.rainbow,
R.drawable.report,
R.drawable.ruby,
R.drawable.shield,
R.drawable.sport_8ball,
R.drawable.sport_basketball,
R.drawable.sport_football,
R.drawable.sport_raquet,
R.drawable.sport_shuttlecock,
R.drawable.sport_soccer,
R.drawable.sport_tennis,
R.drawable.star,
R.drawable.stop,
R.drawable.table_icon,
R.drawable.telephone,
R.drawable.television,
R.drawable.facebook
};
public ImageAdapter(Context c) {
mContext = c;
TypedArray attr = mContext.obtainStyledAttributes(R.styleable.GalleryTheme);
mGalleryItemBackground = attr.getResourceId(
R.styleable.GalleryTheme_安卓_galleryItemBackground, 0);
attr.recycle();
}
public int getCount() {
return mImageIds.length;
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
ImageView imageView = new ImageView(mContext);
imageView.setImageResource(mImageIds[position]);
imageView.setLayoutParams(new Gallery.LayoutParams(150, 100));
imageView.setScaleType(ImageView.ScaleType.FIT_XY);
imageView.setBackgroundResource(mGalleryItemBackground);
return imageView;
}
}
下面是logcat输出：
02-21 10:40:29.317: E/AndroidRuntime(3347): FATAL EXCEPTION: main
02-21 10:40:29.317: E/AndroidRuntime(3347): java.lang.NullPointerException
02-21 10:40:29.317: E/AndroidRuntime(3347): at com.flufflydelusions.app.enotesclassic.NoteEdit.statusbarCustom(NoteEdit.java:1954)
02-21 10:40:29.317: E/AndroidRuntime(3347): at com.flufflydelusions.app.enotesclassic.NoteEdit.access$67(NoteEdit.java:1949)
02-21 10:40:29.317: E/AndroidRuntime(3347): at com.flufflydelusions.app.enotesclassic.NoteEdit$25.onClick(NoteEdit.java:1835)
02-21 10:40:29.317: E/AndroidRuntime(3347): at com.安卓.internal.app.AlertController$AlertParams$3.onItemClick(AlertController.java:935)
02-21 10:40:29.317: E/AndroidRuntime(3347): at 安卓.widget.AdapterView.performItemClick(AdapterView.java:284)
02-21 10:40:29.317: E/AndroidRuntime(3347): at 安卓.widget.ListView.performItemClick(ListView.java:3746)
02-21 10:40:29.317: E/AndroidRuntime(3347): at 安卓.widget.AbsListView$PerformClick.run(AbsListView.java:1981)
02-21 10:40:29.317: E/AndroidRuntime(3347): at 安卓.os.Handler.handleCallback(Handler.java:587)
02-21 10:40:29.317: E/AndroidRuntime(3347): at 安卓.os.Handler.dispatchMessage(Handler.java:92)
02-21 10:40:29.317: E/AndroidRuntime(3347): at 安卓.os.Looper.loop(Looper.java:130)
02-21 10:40:29.317: E/AndroidRuntime(3347): at 安卓.app.ActivityThread.main(ActivityThread.java:3691)
02-21 10:40:29.317: E/AndroidRuntime(3347): at java.lang.reflect.Method.invokeNative(Native Method)
02-21 10:40:29.317: E/AndroidRuntime(3347): at java.lang.reflect.Method.invoke(Method.java:507)
02-21 10:40:29.317: E/AndroidRuntime(3347): at com.安卓.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907)
02-21 10:40:29.317: E/AndroidRuntime(3347): at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:665)
02-21 10:40:29.317: E/AndroidRuntime(3347): at dalvik.system.NativeStart.main(Native Method)
# 1 楼答案
中缺少“视图” 看法画廊的findViewById