Android 中Activity 之间传递参数

android 中activity 之间传递参数

1.传递简单数据

在a activity中

findviewbyid(r.id.startbacticitybtn).setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        intent i = new intent(mainactivity.this,theactivity.class);
//        对基础的数据类型进行传递
       i.putextra("data","我是国人");
       startactivity(i);
      }
    });

在b activity中接受数据

  tv =(textview)findviewbyid(r.id.thetextview);
    intent i = getintent();
    tv.settext(i.getstringextra("data"));

这种传值就是传递基本的数据类型

2.传递数据 包bundle

在a activity中

 findviewbyid(r.id.startbacticitybtn).setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        intent i = new intent(mainactivity.this,theactivity.class);
        bundle bundle = new bundle();
        bundle.putstring("name","qll");
        bundle.putint("age",3);

//        i.putextras(bundle); 
//        另种传递方式
        i.putextra("data",bundle);
        startactivity(i);
      }
    });
  }

在b activity中接受数据     

 tv =(textview)findviewbyid(r.id.thetextview);
    edittext = (edittext) findviewbyid(r.id.edittext3);
    intent i = getintent();
//    bundle date = i.getextras();
//     接受方式不同
    bundle date = i.getbundleextra("data");
    tv.settext(string.format("name=%s,age=%d",date.getstring("name"),date.getint("age")));

这总传递方式类似ios中传递字典数据类型过来 。

3.传递值对象

自定义一个user类，传递自定义类需要对类进行序列化

用serializable进行序列化

这种方法只需要类实现serializable接口就可以了

user 类

import java.io.serializable;

public class user implements serializable{

  private string name;
  private int age;

  public int getage(){
    return age;
  }

  public void setage(int age){
    this.age = age;
  }

  public string getname(){
    return name;
  }

  public void setname(string name){
    this.name = name;
  }

  public user(string name,int age){
    this.name = name;
    this.age = age;
  }

在a activity中   

  findviewbyid(r.id.startbacticitybtn).setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        intent i = new intent(mainactivity.this,theactivity.class);
        i.putextra("user",new user("qll",24));
        startactivity(i);
      }
    });
  }

在b activity中

 tv =(textview)findviewbyid(r.id.thetextview);
 user user = (user)i.getserializableextra("user");
 tv.settext(string.format("user info(name=%s,age=%d)",user.getname(),user.getage()));

用parcelable实现

同样的需要实现parcelable接口

user 类

package com.example.wyhaiapple.transferdata1;

import android.os.parcel;
import android.os.parcelable;
import android.text.parcelablespan;

public class user implements parcelable{
  private string name;
  private int age;

  public int getage(){
    return age;
  }

  public void setage(int age){
    this.age = age;
  }

  public string getname(){
    return name;
  }

  public void setname(string name){
    this.name = name;
  }

  public user(string name,int age){
    this.name = name;
    this.age = age;
  }

  @override
  public int describecontents() {
    return 0;
  }

  @override
  public void writetoparcel(parcel dest, int flags) {
    dest.writestring(getname());
    dest.writeint(getage());
  }


  public static final creator<user> creator = new creator<user>() {
    @override
    public user createfromparcel(parcel source) {
      return new user(source.readstring(),source.readint());
    }

    @override
    public user[] newarray(int size) {
      return new user[size];
    }
  };
}

在a activity中 与上面的相同

在b activity中

 tv =(textview)findviewbyid(r.id.thetextview);
 user user = (user)i.getparcelableextra("user");
 tv.settext(string.format("user info(name=%s,age=%d)",user.getname(),user.getage()));

4.获取 activity 的返回参数

在b activity中

protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(r.layout.activity_the);
    tv =(textview)findviewbyid(r.id.thetextview);
    edittext = (edittext) findviewbyid(r.id.edittext3);

    findviewbyid(r.id.button2).setonclicklistener(new view.onclicklistener() {
      @override
      public void onclick(view v) {
        intent i = new intent();
        i.putextra("data",edittext.gettext().tostring());
        setresult(1,i);
        finish();
      }
    });
  }
}

在a activity中

startactivityforresult(i,0);

  @override
  protected void onactivityresult(int requestcode, int resultcode, intent data) {
    super.onactivityresult(requestcode, resultcode, data);
    textview.settext("返回的值："+data.getstringextra("data"));
  }

如有疑问请留言或者到本站社区交流讨论，感谢阅读，希望能帮助到大家，谢谢大家对本站的支持！