java - 如何跨 Activity 发送非字符串数据

Question

在 twitterfragment 类中我有

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 类中，我想获取我从 twitter fragment 发送的雕像。

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
    }

这里的 Intent 希望在函数 getIntent.getStringArrayExtra(...) 中获取 StringArray，但我已经从我的 fragment 中发送了 Twitter 状态。

Answer 1

因为 twitter4j.Status类实现 Serializable，您应该能够创建一个 Serializable 包装类并通过 Intent Extras 发送它。

在 MyStatuses.java 中创建一个 MyStatuses 类:

import java.io.Serializable;

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

然后在 Intent Extras 中发送一个包装类的实例:

    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() 来获取 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;
        }
    }