在活动之间传递对象的数组列表

Question

我试图在两个活动之间传递一个对象数组列表，但我的应用程序在第二个活动中崩溃了。 有人能帮我解决这个问题吗...

这是我的第一个活动的代码：

Intent i = new Intent();
Bundle b = new Bundle();
b.putParcelableArrayList("songs",(ArrayList<? extends Parcelable>) albumsArray.get(position).getSongs());
Log.v("--", "OK");
i.putExtras(b);
i.setClass(LatestAlbums.this, AlbumDetails.class);
startActivity(i);

来自第二个活动的代码：

songs=new ArrayList<Songs>();
Bundle b = this.getIntent().getExtras();
if(b!=null)
    songs = b.getParcelable("songs");
Log.v("--", songs.size()+"");

我的 logcat 输出：

04-03 16:37:03.513: E/AndroidRuntime(6576): FATAL EXCEPTION: main
04-03 16:37:03.513: E/AndroidRuntime(6576): java.lang.RuntimeException: Parcel: unable to marshal value com.musicapp.objects.Songs@419489e8
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.os.Parcel.writeValue(Parcel.java:1137)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.os.Parcel.writeList(Parcel.java:524)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.os.Parcel.writeValue(Parcel.java:1097)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.os.Parcel.writeMapInternal(Parcel.java:493)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.os.Bundle.writeToParcel(Bundle.java:1612)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.os.Parcel.writeBundle(Parcel.java:507)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.content.Intent.writeToParcel(Intent.java:6147)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.app.ActivityManagerProxy.startActivity(ActivityManagerNative.java:1613)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.app.Instrumentation.execStartActivity(Instrumentation.java:1379)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.app.Activity.startActivityFromChild(Activity.java:3458)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.app.Activity.startActivityForResult(Activity.java:3210)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:817)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.app.Activity.startActivity(Activity.java:3297)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at com.outsourcefarm.musicagratis.activities.LatestAlbums$4$1.onItemClick(LatestAlbums.java:232)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.widget.AdapterView.performItemClick(AdapterView.java:292)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.widget.AbsListView.performItemClick(AbsListView.java:1058)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.widget.AbsListView$PerformClick.run(AbsListView.java:2514)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.widget.AbsListView$1.run(AbsListView.java:3168)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.os.Handler.handleCallback(Handler.java:605)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.os.Handler.dispatchMessage(Handler.java:92)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.os.Looper.loop(Looper.java:137)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at android.app.ActivityThread.main(ActivityThread.java:4440)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at java.lang.reflect.Method.invokeNative(Native Method)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at java.lang.reflect.Method.invoke(Method.java:511)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:787)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:554)
04-03 16:37:03.513: E/AndroidRuntime(6576):     at dalvik.system.NativeStart.main(Native Method)

Answer 1

你试试下面的

intent.putParcelableArrayListExtra("key", ArrayList<T extends Parcelable> list);
startActivity(intent);

检索它

getIntent().getParcelableArrayListExtra("key");

将用户定义对象的数组列表传递给 Intent android 。 检查 Sajmon 的答案

据Sajmon提出的意见， Song类必须implement Parcelable

Answer 2

你应该让你的Song类实现Parcelable 。

Answer 3

Intent intent=new Intent(ActivityFrom.this,ActivityTo.class);
intent.putExtra("StringKey",arrayList);
startActivity(intent);

并检索

ArrayList<String> myList = (ArrayList<String>) getIntent().getSerializableExtra("StringKey");

Answer 4

     i.setClass(LatestAlbums.this, AlbumDetails.class);
     i.putStringArrayListExtra("list", your song list);
     startActivity(i);

获取活动中的数组列表。

ArrayList<String> fetchList= new ArrayList<String>();
fetchList=  getIntent().getStringArrayListExtra("list");

希望这会帮助你。

如需更多参考，请使用此链接。

Answer 5

指这个问题。 我希望这个例子对你有帮助。

1. 你的 Song 类应该实现 Parcelable 类

public class Song implements Parcelable { 
//Your setter and getter methods
}

2. 把你的数组列表放到 putParcelableArrayListExtra()

public class ActivityA extends AppCompatActivity {
ArrayList<Song> songs;

@Override
protected void onCreate(Bundle savedInstanceState) {
button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            startActivity(new Intent(getApplicationContext(), ActivityB.class)
            .putParcelableArrayListExtra("songs", (ArrayList<? extends Parcelable>) songs));
        }
    });
}

3.在ActivityB中

public class ActivityB extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
    Intent intent = getIntent();
    final ArrayList<Song> songs = intent.getParcelableArrayListExtra("songs");

    //Check the value in the console
    buttonCheck.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            for (Song value : songs) {
                System.out.println(value.getTitle());
            }
        }
    });
}

Answer 6

您可以像这样使 Songs 类实现 Serializable。

public class Songs implements Serializable{ // your code here } .

在活动一

Intent intent =  new Intent(MainActivity.this,Main2Activity.class);
Bundle bundle = new Bundle();
bundle.putSerializable("Songs",arrSongs); //where arrSongs is object of  ArrayList<Songs>

intent.putExtras(bundle);
startActivity(intent);

在您想要检索 ArrayList 对象的 SecondActivity 中

 Bundle bundle =  getIntent().getExtras();
 private ArrayList<Songs> items;
 items = (ArrayList<Songs>)bundle.getSerializable("Songs");