android参数传递的几种方法

Intent
Intent i=new Intent(当前Activity.this,目标Activity.class);
1.传单值
传入:
i. i.putExtra("名称","数据类型");
startActivity(i)
接收:
Intent i=getIntent();
String val=i.getStringExtra("名字");
2.传Bunlde对象
传入:
(1)
Bunlde b=new Bunlde();
b.putString("键值名称","键值");
i. i.putExtra(b);
(2)
  i. i.putExtra("名称",b);
接收:
  Intent i=getIntent();
(1)
  Bunlde data=i.getExtras();
(2)
  Bunlde data=i.getBunldeExtra("名称");
  String val=data.getString("键值名称");
  //键值不存在的时候,赋默认值
  String val=data.getString("键值名称","默认值");
3.传Model对象
方式一:Serializable:
  传入:
  public class UserModel implements Serializable{}
  i.putExtra("user", new UserModel(strAccount,"test",1));
  接收:
  UserModel user=(UserModel)i.getSerializableExtra("user");
  String userName=user.getUserName();
方式二:Parcelable:
  public class UserModel implements Parcelable {
    protected UserModel(Parcel in) {
      UserId = in.readInt();
      UserName = in.readString();
      Account = in.readString();
    }
    public static final Creator<UserModel> CREATOR = new Creator<UserModel>() {
      @Override
      public UserModel createFromParcel(Parcel in) {
        return new UserModel(in.readString(),in.readString(),in.readInt());
      }
      @Override
      public UserModel[] newArray(int size) {
        return new UserModel[size];
      }
    };
  private int UserId;
  public int getUserId() {return UserId;}
  public void setUserId(int userId) {this.UserId = userId;}
  private String UserName;
  public String getUserName() {return UserName;}
  public void setUserName(String userName) {this.UserName = userName;}
  private String Account;
  public String getAccount() {return Account;}
  public void setAccount(String account) {this.Account = account;}
  public UserModel(String strAccount,String strUserName,int id){
    this.Account=strAccount;
    this.UserId=id;
    this.UserName=strUserName;
    }
    @Override
    public int describeContents() {
      return 0;
    }
    @Override
    public void writeToParcel(Parcel dest, int flags) {
      dest.writeString(getAccount());
      dest.writeString(getUserName());
      dest.writeInt(getUserId());
    }
}
传入:
i.putExtra("user", (Parcelable) new UserModel(strAccount,"test",1));
接收:
UserModel user=(UserModel)i.getParcelableExtra("user");
String userName=user.getUserName();
4.传返回值
1.需要返回的界面
  Intent i=new Intent();
  i. i.putExtra("名称","数据类型");
  setResult(1,i);
  finish();
2.返回界面接收值
  startActivityForResult(i,0);//第一个为数据参数,第二个为请求代码参数
  加下面方法
  @Override
  //requestCode:请求代码
  //resultCode:返回的结果码
  //data:返回的结果数据
  protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    //处理返回回来的数据。
  }
posted @ 2017-04-21 11:32  二先生  阅读(7487)  评论(0编辑  收藏  举报