java - 我从 Android ActivityForResult 发送一个可打包类并收到 null

Question

对于常见问题，我们深表歉意，但我检查了所有内容，但找不到错误。我从 Activity 发送类并收到 NULL。创建 Intent 后检查是否正确(我的代码中的 readbackCi)。您能帮我找到解决方案吗？

我的类(class) CityItem

import android.os.Parcel;
import android.os.Parcelable;

public class CityItem implements Parcelable {
public static final String ITEM_SEP = System.getProperty("line.separator");
public static final String NAME = "City";
public static final String REGNAME = "Region";
public static final String CODE = "Code";
public static final String SEARCH = "Search";

private String mName;
private String mRegName;
private String mSearch;
private String mCode;

public CityItem(String name, String regname, String code, String search) {
    mName = name;
    mRegName = regname;
    mSearch = search;
    mCode = code;
}

private CityItem(Parcel in) {
    in.readParcelable(CityItem.class.getClassLoader());
    setName(in.readString());
    setRegName(in.readString());
    setCode(in.readString());
    setSearch(in.readString());
}

public String getName() {
    return mName;
}

public void setName(String name) {
    mName = name;
}

public String getRegName() {
    return mRegName;
}

public void setRegName(String regname) {
    mRegName = regname;
}

public String getCode() {
    return mCode;
}

public void setCode(String code) {
    mRegName = code;
}

public String getSearch() {
    return mSearch;
}

public void setSearch(String search) {
    mRegName = search;
}

public String toString() {
    return mName + ITEM_SEP + mRegName + ITEM_SEP + mCode + ITEM_SEP
            + mSearch;
}

public String toLog() {
    return "Name:" + mName + ITEM_SEP + "Region:" + mRegName
            + ITEM_SEP + "Code:" + mCode + ITEM_SEP + "Search:"
            + mSearch + "\n";
}

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

@Override
public void writeToParcel(Parcel dest, int flags) {
    dest.writeStringArray(new String[] { mName, mRegName, mCode, mSearch });
}

public static final Parcelable.Creator<CityItem> CREATOR = new Parcelable.Creator<CityItem>() {
    @Override
    public CityItem createFromParcel(Parcel source) {
            return new CityItem(source);
        }
    @Override
    public CityItem[] newArray(int size) {
        return new CityItem[size];
    }
};

}

第二个 Activity

public void enterClicked(CityItem str) {  
    Log.i(TAG,"Entered enterClicked()");
    Intent result = new Intent();
    result.putExtra("TAG", str);
    CityItem readbackCi = result.getParcelableExtra("TAG");
    Log.d(TAG, "\n\n\t" + readbackCi.NAME);
    setResult(this.RESULT_OK, result);

    finish();
}

主要 Activity

    @Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    Log.i(TAG, "Entered onActivityResult()");
    if(ADD_DERIVAL_REQUEST == requestCode && this.RESULT_OK == resultCode)
    {
        CityItem ci = (CityItem) getIntent().getParcelableExtra("TAG");
        if (null != ci) {
            EditText1.setText(ci.getName());                
        }
        return;
    } else if (ADD_DERIVAL_REQUEST == requestCode && RESULT_CANCELED == resultCode)
    {
        return;
    }
}

Answer 1

您需要使用Intent data来获取结果。

CityItem ci = (CityItem) data.getParcelableExtra("TAG");

getIntent() 将返回用于主 Activity 启动的 Intent ，但它不是您感兴趣的 Intent 。