Picasso IllegalArgumentException 目标不能为空

Question

我正在尝试通过在我的项目中使用 Picasso 库来设置图像。

当我单击视图的图像时，Picasso 执行时出现错误。

应用程序的 Logcat

  java.lang.IllegalArgumentException: Target must not be null.
            at com.squareup.picasso.RequestCreator.into(RequestCreator.java:340)
            at com.squareup.picasso.RequestCreator.into(RequestCreator.java:326)
            at com.zafer.celaloglu.FragmentsandActivities.UnfoldableDetailsFragment.openDetails(UnfoldableDetailsFragment.java:89)
            at com.zafer.celaloglu.model.PaintingsAdapter.onClick(PaintingsAdapter.java:52)
            at android.view.View.performClick(View.java:4084)
            at android.view.View$PerformClick.run(View.java:16966)
            at android.os.Handler.handleCallback(Handler.java:615)
            at android.os.Handler.dispatchMessage(Handler.java:92)
            at android.os.Looper.loop(Looper.java:137)
            at android.app.ActivityThread.main(ActivityThread.java:4745)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:511)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
            at dalvik.system.NativeStart.main(Native Method)

UnfoldableDetailsFragment 89 =

public void openDetails(View coverView, Painting painting) {
    ImageView image = (ImageView) coverView.findViewById(R.id.details_image);
    TextView title = (TextView) coverView.findViewById(R.id.details_title);
    TextView description = (TextView) coverView.findViewById(R.id.details_text);

    Picasso.with(getActivity()).load(painting.getImageId()).into(image); ->89. LINE
    Log.i("bilgi", "basildi");

    title.setText(painting.getTitle());

    SpannableBuilder builder = new SpannableBuilder(getActivity());
    builder
            .createStyle().setFont(Typeface.DEFAULT_BOLD).apply()
            .append(R.string.year).append(": ")
            .clearStyle()
            .append(painting.getYear()).append("\n")
            .createStyle().setFont(Typeface.DEFAULT_BOLD).apply()
            .append(R.string.location).append(": ")
            .clearStyle()
            .append(painting.getLocation());
    description.setText(builder.build());

    mUnfoldableView.unfold(coverView, mDetailsLayout);
}

绘画适配器：

public class PaintingsAdapter extends ItemsAdapter<Painting> implements View.OnClickListener {

public PaintingsAdapter(Context context) {
    super(context);
    setItemsList(Arrays.asList(Painting.getAllPaintings(context.getResources())));
}

@Override
protected View createView(Painting item, int pos, ViewGroup parent, LayoutInflater inflater) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item, parent, false);
    ViewHolder vh = new ViewHolder();
    vh.image = Views.find(view, R.id.list_item_image);
    vh.image.setOnClickListener(this);
    vh.title = Views.find(view, R.id.list_item_title);
    view.setTag(vh);

    return view;
}

@Override
protected void bindView(Painting item, int pos, View convertView) {
    ViewHolder vh = (ViewHolder) convertView.getTag();

    vh.image.setTag(item);
    Picasso.with(convertView.getContext()).load(item.getImageId()).noFade().into(vh.image);
    vh.title.setText(item.getTitle());
}

@Override
public void onClick(View view) {
    //Log.i("bilgi", "basildi");
    UnfoldableDetailsFragment fm = new UnfoldableDetailsFragment();
    fm.openDetails(view, (Painting)view.getTag()); -->HERE IS 52. line
    Log.i("bilgi", "basildi");

}

private static class ViewHolder {
    ImageView image;
    TextView title;
}

}

Answer 1

image

是传递给

into

的目标。这就是

null

.

确保您的布局 ID 对于所有配置都是正确的，并指定

@+id/details_image

.

Answer 2

确保你膨胀正确的 xml 那是我的问题，因为我复制了一个已经存在的适配器并忘记更改它

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(context)
            .inflate(R.layout.list_item_subcategories, parent, false);

我应该放的布局是 list_item_categories

Answer 3

我知道这有点旧，但我刚刚花了很多时间做的一件事是忘记对图像所在的布局运行“setContentView”。

ImageView 将在其所在的主要布局被膨胀之前为空；）

Answer 4

检查您的 imageview 对象的 ID 是否正确 -

imageView=itemView.findViewById(R.id.imageview1);

Answer 5

也许 painting.getImageId() 为空或 null？

或者 image 或 getActivity()？ :)

Answer 6

检查您在布局文件中设置的 Id。

android:id="@+id/details_image"

那么，

 ImageView image = (ImageView) coverView.findViewById(R.id.details_image);

Answer 7

@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(context).inflate(R.layout.show_item, parent, false);
    return new ViewHolder(view);
}

确保您选择了正确的布局资源文件，这就是导致我出错的原因。