Question

我在这里和许多其他网站上尝试了很多不同的解决方案 - 但我无法让它发挥作用！

我在一个活动中有一个对象“公寓”，用于另一个活动。活动从MyMapOverlayItem类开始，应该启动应该使用Apartment对象的ApartmentInfoActivity。

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();
    }

}

Apartment.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();
            }
            }
        }

ApartmentParcel.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];
        }
    };
}

ApartmentInfoActivity.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

使您的公寓课程实施Serializable：

public class Apartment implements Serializable{

然后在MyMapOverlayIcon：

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

然后在ApartmentInfoActivity：

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

Answer 2

在活动之间共享对象的首选方法是使共享对象Parcelable http://developer.android.com/reference/android/os/Parcelable.html（另请参阅http://developer.android.com/reference/android/os/Parcelable.Creator.html）。然后你可以在某处定义一个String键，并用它来将Parcelable项放入Bundle对象和从Bundle对象中获取。

在主要活动中：

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

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

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

并在儿童活动中

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

如果您的班级中有一组正在实施Parcelable的项目，您可以像这样处理：

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];
        }
    };
}

在活动之间传递自定义对象

2 个答案: