如果更新可绘制文件夹，共享首选项不会正确保存可绘制资源 ID

Question

我有一个自定义对象 Card()` public Card(String Element , String Color , int ResourceId , int CardNumber ,String Special){

    mResourceId = ResourceId ;
    mCardNumber = CardNumber ;
    mElement = Element ;
    mColor = Color ;
    mSpecial=Special;
}`

mResourceId 是卡片图像的可绘制对象 当我将 Card 类型的 Arraylist 保存到 Shared Preference，然后将单个图像添加到可绘制文件夹并更新应用程序时，Arraylist 的所有 Card ResourceId 都混合在一起并且无法正确显示The normal images of the arraylist of Cards

incorrect images replace the cards after adding some new images to the drawable folder and updating the app

我确信我添加到可绘制文件夹的新图像名称与现有图像的任何名称都不匹配

public class Card implements Parcelable{
private int mResourceId, mCardNumber;
private String mColor, mElement,mSpecial,mResId;

public Card(String Element , String Color , int ResourceId , int CardNumber ){

    mResourceId = ResourceId ;
    mCardNumber = CardNumber ;
    mElement = Element ;
    mColor = Color ;
}

public Card(String Element , String Color , String ResourceId , int CardNumber ){

    mResId = ResourceId ;
    mCardNumber = CardNumber ;
    mElement = Element ;
    mColor = Color ;
}


public Card(String Element , String Color , int ResourceId , int CardNumber ,String Special){

    mResourceId = ResourceId ;
    mCardNumber = CardNumber ;
    mElement = Element ;
    mColor = Color ;
    mSpecial=Special;
}


protected Card(Parcel in) {
    mResourceId = in.readInt();
    mCardNumber = in.readInt();
    mColor = in.readString();
    mResId = in.readString();
    mElement = in.readString();
    mSpecial = in.readString();
}

public static final Creator<Card> CREATOR = new Creator<Card>() {
    @Override
    public Card createFromParcel(Parcel in) {
        return new Card(in);
    }

    @Override
    public Card[] newArray(int size) {
        return new Card[size];
    }
};


public Object getResourceId() {
    if (mResId==null){return mResourceId;}
    else {return mResId;}

}

public int getResourceId(Context context) {
    try {
        return context.getResources().getIdentifier(mResId, "drawable", context.getPackageName());
    } catch (Exception e) {
        e.printStackTrace();
        return 0;
    }
}

public void setResourceId(int ResourceId) {this.mResourceId = ResourceId;}

public void setElement(String Element) {this.mElement = Element;}

public void setCardNumber(int CardNumber) {this.mCardNumber = CardNumber;}

public int getCardNumber() {
    return mCardNumber;
}

public String getCardElement() {
    return mElement;
}

public String getCardColor() {
    return mColor;
}

public String getSpecial() {
    return mSpecial;
}

public boolean isPowerCard(){
    boolean isspecial=false;
    if (mSpecial==null){isspecial= false;}
    else {isspecial= true;}
    return isspecial;
}

@Override
public int describeContents() {
    return 0;
}

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeInt(mResourceId);
    dest.writeInt(mCardNumber);
    dest.writeString(mColor);
    dest.writeString(mElement);
    dest.writeString(mSpecial);
}

}

Answer 1

资源 ID 是随着应用更新而动态生成的。因此在您的情况下它会失败。

您可以尝试将资源的名称存储在共享首选项中，并使用该名称获取资源的 id。

    Resources resources = getResources();
    String resourceName = resources.getResourceEntryName(R.drawable.resource);

然后您可以从共享首选项中检索 id。

intresId = resources.getIdentifier(resourceName, "drawable", "your.package.name");