活動之間通過自定義 object

Question

我已經嘗試了許多不同的解決方案，在這里和許多其他網站 - 但我就是無法讓它工作！

我在一項活動中有一個 object “公寓”，該活動將用於另一項活動。 該活動從 class MyMapOverlayItem 開始，應該啟動 ApartmentInfoActivity，其中應該使用 Apartment object。

MyMapOverlayItem.java：

package com.android.madsoft.spotter;

import java.util.ArrayList;

import android.content.Context;
import android.content.Intent;
import android.graphics.drawable.Drawable;
import android.os.Bundle;

import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.OverlayItem;

public class MyMapOverlayIcon extends ItemizedOverlay<OverlayItem> {
    Context mContext;
    ArrayList<Apartment> myList;
    private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
    public MyMapOverlayIcon(Drawable defaultMarker) {
        super(defaultMarker);

    }

    public MyMapOverlayIcon(Drawable defaultMarker, Context context, ArrayList<Apartment> myList) {
        super(boundCenterBottom(defaultMarker));
          mContext = context;
          this.myList = myList;

        }

    public void addOverlay(OverlayItem overlay) {
        mOverlays.add(overlay);
        populate();
    }

    @Override
    protected boolean onTap(int index) {
        Apartment ap = myList.get(index);
        ApartmentParcel ap1 = new ApartmentParcel(ap);
        Intent i = new Intent(mContext, ApartmentInfoActivity.class);
        Bundle b = new Bundle();
        b.putParcelable("app", ap1);
        i.putExtras(b);
//      i.putExtra("app",ap1);
//      b.putSerializable("apartment", ap);

        // WHAT TO DO!?

        mContext.startActivity(i);

      return true;
    }

    @Override
    protected OverlayItem createItem(int i) {
      return mOverlays.get(i);
    }

    @Override
    public int size() {
      return mOverlays.size();
    }

}

公寓.java：

package com.android.madsoft.spotter;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;


public class Apartment {


    private static final long serialVersionUID = 1L;
    int latitude, longitude;
    String id, 
    zipcode, 
    size, 
    rooms, 
    rentprice, 
    deposit, 
    takeoverdate, 
    rentperiod, 
    furniturized, 
    usagecost, 
    addeddate, 
    description,
    prepaid;
    ArrayList<String> imageList, phonenumbers;
    int imagecount = 1;
    ArrayList<Bitmap> bigBitmapList;
    ArrayList<Bitmap> smallBitmapList;

    public Apartment(String id, int latitude, int longitude, 
                    String zipcode, String size, String rooms, 
                    String rentprice, String deposit, String prepaid, String takeoverdate, 
                    String rentperiod, String furniturized, String usagecost, 
                    String addeddate, String description, ArrayList<String> imageList, ArrayList<String> phonenumbers){
        bigBitmapList = new ArrayList<Bitmap>();
        smallBitmapList = new ArrayList<Bitmap>();
        this.addeddate = addeddate;
        this.deposit = deposit;
        this.description = description;
        this.furniturized = furniturized;
        this.id = id;
        this.imageList = imageList;
        this.latitude = latitude;
        this.longitude = longitude;
        this.phonenumbers = phonenumbers;
        this.prepaid = prepaid;
        this.rentperiod = rentperiod;
        this.rentprice = rentprice;
        this.rooms = rooms;
        this.size = size;
        this.takeoverdate = takeoverdate;
        this.usagecost = usagecost;
        this.zipcode = zipcode;

        for (String s :imageList){

            URL myFileUrl = null;
            try {
                 myFileUrl= new URL(s);
            } catch (MalformedURLException e) {
                 e.printStackTrace();
            }
            try {
                 HttpURLConnection conn= (HttpURLConnection)myFileUrl.openConnection();
                 conn.setDoInput(true);
                 conn.connect();
                 InputStream is = conn.getInputStream();
                 Bitmap image = BitmapFactory.decodeStream(is); //Saves the current icon
                 bigBitmapList.add(image);
                 //Icon will now be resized to 125px*100px               
                    Bitmap resized; 
                    int scalerate = (int)image.getHeight()/60;
                    int newHeight = (int)image.getHeight()/scalerate;
                    int newWidth = (int)image.getWidth()/scalerate; 
                    resized = Bitmap.createScaledBitmap(image, newWidth, newHeight, false);
                    smallBitmapList.add(resized);
            }
            catch (IOException e) {
                e.printStackTrace();
            }
            }
        }

公寓Parcel.java：

package com.android.madsoft.spotter;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Parcel;
import android.os.Parcelable;

public class ApartmentParcel implements Parcelable {

    private static final long serialVersionUID = 1L;
    int latitude, longitude;
    String id, 
    zipcode, 
    size, 
    rooms, 
    rentprice, 
    deposit, 
    takeoverdate, 
    rentperiod, 
    furniturized, 
    usagecost, 
    addeddate, 
    description,
    prepaid;
    ArrayList<String> imageList, phonenumbers;
    int imagecount = 1;
    ArrayList<Bitmap> bigBitmapList;
    ArrayList<Bitmap> smallBitmapList;

    public ApartmentParcel(String id, int latitude, int longitude, 
                    String zipcode, String size, String rooms, 
                    String rentprice, String deposit, String prepaid, String takeoverdate, 
                    String rentperiod, String furniturized, String usagecost, 
                    String addeddate, String description, ArrayList<String> imageList, ArrayList<String> phonenumbers){
        bigBitmapList = new ArrayList<Bitmap>();
        smallBitmapList = new ArrayList<Bitmap>();
        this.addeddate = addeddate;
        this.deposit = deposit;
        this.description = description;
        this.furniturized = furniturized;
        this.id = id;
        this.imageList = imageList;
        this.latitude = latitude;
        this.longitude = longitude;
        this.phonenumbers = phonenumbers;
        this.prepaid = prepaid;
        this.rentperiod = rentperiod;
        this.rentprice = rentprice;
        this.rooms = rooms;
        this.size = size;
        this.takeoverdate = takeoverdate;
        this.usagecost = usagecost;
        this.zipcode = zipcode;

        for (String s :imageList){

            URL myFileUrl = null;
            try {
                 myFileUrl= new URL(s);
            } catch (MalformedURLException e) {
                 e.printStackTrace();
            }
            try {
                 HttpURLConnection conn= (HttpURLConnection)myFileUrl.openConnection();
                 conn.setDoInput(true);
                 conn.connect();
                 InputStream is = conn.getInputStream();
                 Bitmap image = BitmapFactory.decodeStream(is); //Saves the current icon
                 bigBitmapList.add(image);
                 //Icon will now be resized to 125px*100px               
                    Bitmap resized; 
                    int scalerate = (int)image.getHeight()/60;
                    int newHeight = (int)image.getHeight()/scalerate;
                    int newWidth = (int)image.getWidth()/scalerate; 
                    resized = Bitmap.createScaledBitmap(image, newWidth, newHeight, false);
                    smallBitmapList.add(resized);
            }
            catch (IOException e) {
                e.printStackTrace();
            }
            }
        }

    public ApartmentParcel(Apartment ap){
        bigBitmapList = new ArrayList<Bitmap>();
        smallBitmapList = new ArrayList<Bitmap>();
        this.addeddate = ap.getAddeddate();
        this.deposit = ap.getDeposit();
        this.description = ap.getDescription();
        this.furniturized = ap.getFurniturized();
        this.id = ap.getId();
        this.imageList = ap.getImageList();
        this.latitude = ap.getLatitude();
        this.longitude = ap.getLongitude();
        this.phonenumbers = ap.getPhonenumbers();
        this.prepaid = ap.getPrepaid();
        this.rentperiod = ap.getRentperiod();
        this.rentprice = ap.getRentprice();
        this.rooms = ap.getRooms();
        this.size = ap.getSize();
        this.takeoverdate = ap.getTakeoverdate();
        this.usagecost = ap.getUsagecost();
        this.zipcode = ap.getZipcode();
        runMyParcel();
    }

    private void runMyParcel(){
        for (String s :imageList){

            URL myFileUrl = null;
            try {
                 myFileUrl= new URL(s);
            } catch (MalformedURLException e) {
                 e.printStackTrace();
            }
            try {
                 HttpURLConnection conn= (HttpURLConnection)myFileUrl.openConnection();
                 conn.setDoInput(true);
                 conn.connect();
                 InputStream is = conn.getInputStream();
                 Bitmap image = BitmapFactory.decodeStream(is); //Saves the current icon
                 bigBitmapList.add(image);
                 //Icon will now be resized to 125px*100px               
                    Bitmap resized; 
                    int scalerate = (int)image.getHeight()/60;
                    int newHeight = (int)image.getHeight()/scalerate;
                    int newWidth = (int)image.getWidth()/scalerate; 
                    resized = Bitmap.createScaledBitmap(image, newWidth, newHeight, false);
                    smallBitmapList.add(resized);
            }
            catch (IOException e) {
                e.printStackTrace();
            }
            }
    }

    public void setSmallBitmapList(ArrayList<Bitmap> smallBitmapList) {
        this.smallBitmapList = smallBitmapList;
    }


    @Override
    public int describeContents() {
        // TODO Auto-generated method stub
        return 0;
    }


    @Override
    public void writeToParcel(Parcel out, int flags) {
        out.writeString(id); 
        out.writeString(zipcode); 
        out.writeString(size); 
        out.writeString(rooms); 
        out.writeString(rentprice); 
        out.writeString(deposit); 
        out.writeString(takeoverdate); 
        out.writeString(rentperiod); 
        out.writeString(furniturized);
        out.writeString(usagecost);
        out.writeString(addeddate);
        out.writeString(description);
        out.writeString(prepaid);
        out.writeStringList(phonenumbers);
        out.writeList(bigBitmapList);
        out.writeList(smallBitmapList);

    }

    private ApartmentParcel(Parcel in) {
        id = in.readString();
        zipcode = in.readString();
        size = in.readString();     
        rooms = in.readString();
        rentprice = in.readString();
        deposit = in.readString();
        takeoverdate = in.readString();
        rentperiod = in.readString();
        furniturized = in.readString();
        usagecost = in.readString();
        addeddate = in.readString();
        description = in.readString();
        prepaid = in.readString();
        in.readStringList(phonenumbers);
        in.readTypedList(bigBitmapList, Bitmap.CREATOR);
        in.readTypedList(smallBitmapList, Bitmap.CREATOR);
    }

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

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

公寓信息活動.java：

    package com.android.madsoft.spotter;

    import android.app.Activity;
    import android.os.Bundle;
    import android.widget.TextView;

    public class ApartmentInfoActivity extends Activity {


        @Override
            protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.infoview);
//      Apartment ap = (Apartment)getIntent().getSerializableExtra("apartment");
        Apartment ap = (Apartment)getIntent().getParcelableExtra("app");
        TextView zipView = (TextView)findViewById(R.id.txtInfoZip);
        zipView.setText(ap.getZipcode());
    }

    }

Answer 1

讓您的 Aparment class 實現Serializable ：

public class Apartment implements Serializable{

然后在MyMapOverlayIcon上：

Bundle b = new Bundle();
// WHAT TO DO!?
b.putSerializable("apartment", ap);

然后在ApartmentInfoActivity上：

Apartment ap = (Apartment) getIntent().getSerializableExtra("apartment");

Answer 2

The preferred way to share objects between activities is to make the shared object Parcelable http://developer.android.com/reference/android/os/Parcelable.html (see also http://developer.android.com/reference/android /os/Parcelable.Creator.html ）。 然后，您可以在某處定義一個字符串鍵，並將其用於將 Parcelable 項目放入和取出 Bundle object。

在主要活動中：

Intent newActivity = ...;
Bundle extras = new Bundle();

// use your key here to put the parcelable into the bundle

newActivity.putExtras(extras);
startActivity(newActivity);

在子活動中

//child activity (onCreate())
Bundle intentExtras = getIntent().getExtras();
if(intentExtras != null){
   // use the key here to get your parcelable from the bundle
}

如果您的 class 中有一組正在實施 Parcelable 的項目，您可以像這樣處理它：

import java.util.ArrayList;
import java.util.Collection;

import android.graphics.Bitmap;
import android.os.Parcel;
import android.os.Parcelable;

public class ExampleParcelable implements android.os.Parcelable {

    private final String id;
    private final ArrayList<Bitmap> bitmapList = new ArrayList<Bitmap>();

    public ExampleParcelable(String id, Collection<Bitmap> bitmaps){
        this.id = id;
        this.bitmapList.addAll(bitmaps);
    }


    @Override
    public void writeToParcel(Parcel out, int flags) {
        // write stack to be duplicated in 'createFromParcel(Parcel in)'
        out.writeString(id);
        out.writeList(bitmapList);
    }

    @Override
    public int describeContents() {
        // your own logic here
        return 0;
    }

    public static final Parcelable.Creator<ExampleParcelable> CREATOR = new Parcelable.Creator<ExampleParcelable>() {

        @Override
        public ExampleParcelable createFromParcel(Parcel in) {
            String id = in.readString();
            @SuppressWarnings("unchecked")
            ArrayList<Bitmap> bitmaps = (ArrayList<Bitmap>)in.readArrayList(Bitmap.class.getClassLoader());
            return new ExampleParcelable(id, bitmaps);
        }

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