Android Activity与Fragment之间的跳转实例详解

activity及fragment之间的跳转

直接跳转

基本使用方法

public class mainactivity extends appcompatactivity {

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
  }

  public void jump(view view) {
    intent intent = new intent(this, videoplayactivity.class);
    intent.putextra("video_id", "1");
    startactivity(intent);
  }
}

public class videoplayactivity extends activity {
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_video_play);

    intent intent = getintent();
  }
}

借助工具类

然而并没什么卵用

public static void startactivity(context context, class clazz,bundle data) {
  intent intent = new intent(context, clazz);
  if(data != null){
    intent.putextras(data);
  }
  context.startactivity(intent);
}

推荐方案

1. 把new intent()放在目标activity,这样可以oncreate里的getintent形成对应
2. 更容易理解和管理一个出口，多个入口的情况
3. 较方便维护传递数据的key和value（即key由目标activity来定义，value是实际的来源）

public class mainactivity extends appcompatactivity {

  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_main);
  }

  public void jump(view view) {
    startactivity(videoplayactivity.newintent(this, "1"));
  }

}

public class videoplayactivity extends activity {
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_video_play);

  }

  public static intent newintent(context context, string vid) {
    intent intent = new intent(context, videoplayactivity.class);
    intent.putextra("video_id", vid);
    return intent;
  }
}

fragment跳转

• 首先需要一个空的构造方法，fragment恢复重建要使用。
• 使用newinstance代替构造方法传参
• 在fragment.oncreate方法获取实参
  

public class mainfragment{

  public mainfragment() {
    // required empty public constructor
  }

  public static mainfragment newinstance(int pos) {
    mainfragment fragment = new mainfragment();
    bundle args = new bundle();
    args.putint("pos", pos);
    fragment.setarguments(args);
    return fragment;
  }

  @override
  public void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    if (getarguments() != null) {
      pos = getarguments().getint("pos");
    }
  }
}

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