如何跨活動發送非字符串數據

Question

在twitterfragment類中，我有

List<twitter4j.Status> statuses = twitter.getUserTimeline(user);
Intent intent = new Intent(getActivity(), twitter_timeline.class);
intent.putExtra(twitter_timeline.STATUS_LIST, statuses);// this line giving error if I pass status 

在twitter_timeline類中，我想獲取從twitter片段發送的雕像。

public class twitter_timeline extends Activity {
    public static List<twitter4j.Status> STATUS_LIST;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_twitter_timeline);

        setTitle("Timeline");

        List<twitter4j.Status> statuses = (Status) this.getIntent().getStringArrayExtra(STATUS_LIST); // this line not resolving even if I cast it to status type
    }

這里的意圖是希望在函數getIntent.getStringArrayExtra（...）中獲取StringArray，但是我已經從片段中發送了Twitter Status。

Answer 1

因為twitter4j.Status類實現了Serializable，所以您應該能夠創建Serializable包裝器類，並將其通過Intent Extras發送。

在MyStatuses.java中創建一個MyStatuses類：

import java.io.Serializable;

public class MyStatuses implements Serializable {
    List<twitter4j.Status> statuses;
}

然后在Intent Extras中發送包裝類的實例：

    List<twitter4j.Status> statuses = twitter.getUserTimeline(user);
    MyStatuses myStatuses = new MyStatuses();
    myStatuses.statuses = statuses;
    Intent intent = new Intent(getActivity(), twitter_timeline.class);
    intent.putExtra("statuses", myStatuses);

然后使用getSerializable（）以獲得Intent Extra：

public class twitter_timeline extends Activity {
    //public static List<twitter4j.Status> STATUS_LIST; 
    List<twitter4j.Status> statuses;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_twitter_timeline);

        setTitle("Timeline");
        Bundle b = this.getIntent().getExtras();
        if (b != null) {
            MyStatuses myStatuses = (MyStatuses) b.getSerializable("statuses");
            statuses = myStatuses.statuses;
        }
    }