Ich versuche, HashMap als Parcelable zu erweitern, und habe die Syntax zum Kompilieren erhalten. Zur Laufzeit wird jedoch eine Ausnahme ausgelöst und ein Nullzeiger zurückgegeben, der versucht, die Daten zu dekompilieren.

Der Absender muss auf (Parcelable) umwandeln, um Mehrdeutigkeiten aufzulösen. Der Empfänger beschwert sich jedoch darüber, dass Parcelable erwartet wird, aber HashMap gefunden wurde.

Hat jemand Erfolg damit? Ist meine Syntax falsch? Gibt es eine bessere Lösung?

Folgend ist der Code:

HomeActivity.java - der Absender ContentViewActivity.java - der Empfänger ContentItemSimple.java - wie der Name schon sagt (umschließt einen String und eine Ganzzahl) ContentItemCollection.java - das ist die HashMap

HomeActivity.java

package com.mobibob.android.studyparceable;

import java.util.HashMap;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.os.Parcel;
import android.os.Parcelable;
import android.text.format.Time;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class HomeActivity extends Activity implements OnClickListener {
    private static final String TAG = "HomeActivity";
    private ContentItemSimple mContentItemSimple = null;
    private ContentItemContainer mContentItemContainer = null;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.home);

        Button click = (Button) findViewById(R.id.button_clickit);
        click.setOnClickListener(this);

        mContentItemSimple = new ContentItemSimple();
        mContentItemSimple.name = "mobibob";
        mContentItemSimple.year = 2010;

        String value = "value";
        Time nowTime = new Time();
        nowTime.setToNow();
        mContentItemContainer = new ContentItemContainer();
        mContentItemContainer.put("string", new String("baseball is great!"));
        mContentItemContainer.put("integer", new Integer(1234));
//        mContentItemContainer.put("boolean", new Boolean(true));
//        mContentItemContainer.put("date", nowTime);
//        mContentItemContainer.put("parcel", new Bundle());
        Log.d(TAG, "..... " + mContentItemContainer.toString());
    }

    @Override
    public void onClick(View v) {

        Intent i = new Intent(getBaseContext(), ContentViewActivity.class);
        i.putExtra(ContentItemSimple.EXTRA_CONTENT_DETAIL, mContentItemSimple);
        i.putExtra(ContentItemContainer.EXTRA_CONTENT_CONTAINER, (Parcelable) mContentItemContainer);
        startActivityForResult(i, 0);

    }
}

ContentViewActivity

package com.mobibob.android.studyparceable;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

import com.mobibob.android.studyparceable.ContentItemSimple;

public class ContentViewActivity extends Activity implements OnClickListener {

    private static final String TAG = "ContentViewActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.content_view);

        Button gohome = (Button) findViewById(R.id.button_gohome);

        gohome.setOnClickListener(this);

        ContentItemSimple ci = null;
        ContentItemContainer cx = null;

        try {
            ci = getIntent().getParcelableExtra(ContentItemSimple.EXTRA_CONTENT_DETAIL);
            Log.i(TAG, "ci = " + ci.toString());

            cx = getIntent().getParcelableExtra(ContentItemContainer.EXTRA_CONTENT_CONTAINER);
            Log.i(TAG, "cx = " + cx.toString());

            TextView tvName = (TextView) findViewById(R.id.ci_name);
            tvName.setText(ci.name);
            TextView tvYear = (TextView) findViewById(R.id.ci_year);
            tvYear.setText(String.format("%d", ci.year));

        } catch (Exception e) {
            Log.e(TAG, e.toString());
            e.printStackTrace();
        }
    }

    @Override
    public void onClick(View v) {
        finish();
    }

}

ContentItemSimple.java

package com.mobibob.android.studyparceable;

import android.os.Parcel;
import android.os.Parcelable;
import android.util.Log;

public class ContentItemSimple implements Parcelable {
        public static final String TAG = "ContentItem";
    public static final String EXTRA_CONTENT_DETAIL = "contentDetail";
    public String name = "name";
    public Integer year = Integer.MIN_VALUE;

    ContentItemSimple() {
        name = new String("");
        year = new Integer(Integer.MIN_VALUE);
    }

    ContentItemSimple(Parcel in) {
            try {
                name = in.readString();
                year = in.readInt();
            } catch (Exception e) {
                Log.e(TAG, e.toString());
                e.printStackTrace();
        }
    }

    @Override
    public String toString() {
        return String.format("name=%s age=%d", name, year);
    }

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeString(name);
        dest.writeInt(year);
    }

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

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

}

ContentItemContainer.java

package com.mobibob.android.studyparceable;

import java.util.HashMap;
import java.util.Iterator;

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

public class ContentItemContainer extends HashMap<String, Object> implements Parcelable {
    /**
     * Container for wddx 'struct' elements.
     */
    private static final long serialVersionUID = 1L;
    // public String name = "?";
    // public String value = "?";
    public static final String EXTRA_CONTENT_DETAIL = "contentDetail";
    public static final String EXTRA_CONTENT_CONTAINER = "contentContainer";
    public static final String EXTRA_CONTENTDETAIL_NAME = "name";
    public static final String EXTRA_CONTENTDETAIL_VALUE = "value";

//    private static HashMap<String, Object> map = new HashMap<String, Object>();

    ContentItemContainer() {
        super();
    }

    ContentItemContainer(Parcel in) {
        in.readMap(this, ContentItemContainer.class.getClassLoader());
    }

    @Override
    public String toString() {
        StringBuilder sb = new StringBuilder("");
        Integer x = 0;
        Iterator<HashMap.Entry<String, Object>> it = this.entrySet().iterator();
        while (it.hasNext()) {
            HashMap.Entry<String, Object> pairs = (HashMap.Entry<String, Object>) it.next();
            x++;
            sb.append("\n"+x.toString()+": ").append("name=").append(pairs.getKey()).append(" value=").append(pairs.getValue().toString());
        }
        return sb.toString();
    }

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

    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeMap(this);
    }

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

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

}