Question

所以我试图基于相同的布局文件创建一个包含26种不同布局的viewpager，并且我试图通过一个包传递文本和图像。我把文本部分放下了，但我对如何将图像放入包中感到困惑。

public class ScreenSlidePageFragment extends Fragment {
//Resources mResources = getResources();
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.alphabet, container, false);
    TextView tv = (TextView)v.findViewById(R.id.alphabet);
   // ImageView iv = (ImageView)v.findViewById(R.id.letter);
    //Drawable drawable = mResources.getDrawable(R.drawable.aletter);
    //iv.setImageDrawable(drawable);
    tv.setText(getArguments().getString("msg"));

    return v;
}


public static ScreenSlidePageFragment newInstance(String text, Drawable drawable) {

    ScreenSlidePageFragment f = new ScreenSlidePageFragment();
    Bundle b = new Bundle();
    b.putString("msg", text);
   // b.putInt();

    f.setArguments(b);

    return f;
}

}

    public Fragment getItem(int position) {
        switch(position) {
            case 0: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 1");
            case 1: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 2");
            case 2: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 3");
            case 3: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 4");
            case 4: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 5");
            case 5: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 6");
            case 6: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 7");
            case 7: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 8");
            case 8: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 9");
            case 9: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 10");
            case 10: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 11");
            case 11: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 12");
            case 12: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 13");
            case 13: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 14");
            case 14: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 15");
            case 15: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 16");
            case 16: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 17");
            case 17: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 18");
            case 18: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 19");
            case 19: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 20");
            case 20: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 21");
            case 21: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 22");
            case 22: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 23");
            case 23: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 24");
            case 24: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 25");
            case 25: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 26");
            default: return ScreenSlidePageFragment.newInstance("FirstFragment, Instance 1");

        }
    }

Answer 1

您应该在字母表布局中声明一个ImageView。

... some layout container ...
<ImageView android:id="@+id/letter" android:width="wrap_content" android:height="wrap_content" />
... some other layouts...

然后在您的onCreateView中，您可以找到此ImageView，您可以从该包中获取该图像的资源。

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
  View v = inflater.inflate(R.layout.alphabet, container, false);
  TextView tv = (TextView)v.findViewById(R.id.alphabet);
  ImageView iv = (ImageView)v.findViewById(R.id.letter);
  iv.setImageResource(getArguments().getInt("letter")); // maybe check first if the argument is set :)
  tv.setText(getArguments().getString("msg"));

  return v;
}

在newInstance方法中，您可以将正确的资源设置为片段参数。

public static ScreenSlidePageFragment newInstance(String text, @DrawableRes int drawable) {
  ScreenSlidePageFragment f = new ScreenSlidePageFragment();
  Bundle b = new Bundle();
  b.putString("msg", text);
  b.putInt("letter", drawable); // this is the image in your drawable folder that you can access with R.drawable.letter_a (if the file is called letter_a.png

  f.setArguments(b);

  return f;
}

Answer 2

如果要添加更多字段，使用Parcelable会更灵活。

首先，创建自己的对象，例如Screen.java包含字段消息和图片（可绘制）

public class Screen implements Parcelable {

    public String message;   
    public Drawable picture;
    private static final long serialVersionUID = 1L;

    public Screen(String message, Drawable picture){
        this.message = message;
        this.picture = picture;
    }

    /**
     * constructor to rebuild object from the Parcel
     * @param source, a parcel data
     */
    public Screen(Parcel source) {
        this.message = source.readString();       
        this.picture = new BitmapDrawable(
                ( (Bitmap) source.readValue(Bitmap.class.getClassLoader()) )
        );
    }

     /**
     * describe the kind of special object
     */
    @Override
    public int describeContents() {
        return hashCode();
    }

    /**
     * write this object in to a Parcel
     */
    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(message);     
        dest.writeValue(((BitmapDrawable)picture).getBitmap());
    }

    public static final Parcelable.Creator<Screen> CREATOR = new Parcelable.Creator<Screen>() {
        public Screen createFromParcel(Parcel source) {
            return new Screen(source);
        }

        public Screen[] newArray(int size) {
            return new Screen[size];
        }
    };

 }

接下来，您可以开始在片段中传递和接收Parcelable。

public class ScreenSlidePageFragment extends Fragment {

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    View v = inflater.inflate(R.layout.alphabet, container, false);
    TextView tv = (TextView)v.findViewById(R.id.alphabet);
    ImageView iv = (ImageView)v.findViewById(R.id.letter);


    final Screen screen =  getArguments().getParcelable("screen");
    iv.setImageDrawable(screen.picture);
    tv.setText(screen.message);

    return v;
}


public static ScreenSlidePageFragment newInstance(String text, Drawable drawable) {

    ScreenSlidePageFragment f = new ScreenSlidePageFragment();
    Screen screen = new Screen(text, drawable);
    Bundle b = new Bundle();
    b.putParcelable("screen", screen);
    f.setArguments(b);

    return f;
}

希望这会对你有帮助！

尝试将Imageview传递给viewpagerfragment

2 个答案: