在寻呼机适配器中使用字符串数组

Question

我正在我的 Android 应用程序中创建 Slider 适配器，我必须使用来自 strings.xml 的字符串。我认为使用 context.getResources().getStringArray() 会对我有所帮助，但它不起作用。我对 listAdapter 有同样的问题，但我认为我在两种情况下犯了同样的错误。你有什么想法吗？

滑块adapter.class

public class SliderAdapter extends PagerAdapter {

static Resources res = null;
Context context;
LayoutInflater layoutInflater;


public SliderAdapter(Context context)
{
    this.context = context;

}

public int [] slide_images = {
        R.drawable.ecu_start,
        R.drawable.ecu_version


};

String[] slide_headings = context.getResources().getStringArray(R.array.p06_heading);


String[] slide_descs = context.getResources().getStringArray(R.array.p06_desc);


@Override
public int getCount() {
    return slide_headings.length;
}

@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
    return view == (RelativeLayout) object;

}

@NonNull
@Override
public Object instantiateItem(@NonNull ViewGroup container, int position) {
    layoutInflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
    View view = layoutInflater.inflate(R.layout.slide_layout, container, false);




    ImageView slideImageView = (ImageView) view.findViewById(R.id.slide_image);
    TextView slideHeading = (TextView) view.findViewById(R.id.slide_heading);
    TextView slideDescription = (TextView) view.findViewById(R.id.slide_desc);

    slideImageView.setImageResource(slide_images[position]);
    slideHeading.setText(slide_headings[position]);
    slideDescription.setText(slide_descs[position]);

    container.addView(view);

    return view;
}

@Override
public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
    container.removeView((RelativeLayout)object);
}
}

Logcat:

06-16 01:45:01.834 14492-14492/com.example.jacek.hondadiagnostic E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.jacek.hondadiagnostic, PID: 14492 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.jacek.hondadiagnostic/com.example.jacek.hondadiagnostic.Tipsy.P06_vtec_conversion}: java.lang.NullPointerException: Attempt to invoke virtual method 'android.content.res.Resources android.content.Context.getResources()' on a null object reference

Answer 1

试试这个：

public class SliderAdapter extends PagerAdapter {

static Resources res = null;
Context context;
LayoutInflater layoutInflater;


public SliderAdapter(Context context)
{
    this.context = context;

    slide_headings = context.getResources().getStringArray(R.array.p06_heading);
    slide_descs = context.getResources().getStringArray(R.array.p06_desc);
}

public int [] slide_images = {
        R.drawable.ecu_start,
        R.drawable.ecu_version


};

String[] slide_headings  ;


String[] slide_descs ;


@Override
public int getCount() {
  if(slide_headings==null)return 0;
    return slide_headings.length;
}

@Override
public boolean isViewFromObject(@NonNull View view, @NonNull Object object) {
    return view == (RelativeLayout) object;

}

@NonNull
@Override
public Object instantiateItem(@NonNull ViewGroup container, int position) {
    layoutInflater = (LayoutInflater) context.getSystemService(context.LAYOUT_INFLATER_SERVICE);
    View view = layoutInflater.inflate(R.layout.slide_layout, container, false);




    ImageView slideImageView = (ImageView) view.findViewById(R.id.slide_image);
    TextView slideHeading = (TextView) view.findViewById(R.id.slide_heading);
    TextView slideDescription = (TextView) view.findViewById(R.id.slide_desc);

    slideImageView.setImageResource(slide_images[position]);
    slideHeading.setText(slide_headings[position]);
    slideDescription.setText(slide_descs[position]);

    container.addView(view);

    return view;
}

@Override
public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
    container.removeView((RelativeLayout)object);
}
  }

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