Activity

Android中的Activity的生命周期：

 

Activity页面之间如何进行数据传递？？

先写两个页面

然后写两个页面相对应的class类

package com.zking.administrator.g160628_android12_activity;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import com.zking.entity.Person;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private EditText et_main_uname;
    private TextView tv_main_showThink;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        et_main_uname = (EditText) findViewById(R.id.et_main_uname);
        tv_main_showThink = (TextView) findViewById(R.id.tv_main_showThink);
        Log.i("test","onCreate");
//      String content=getIntent().getStringExtra("content");
//      tv_main_showThink.setText(content);
    }

    public void writeThink(View view){
         String uname=et_main_uname.getText().toString();
         Intent intent=new Intent(this,ThinkActivity.class);
        //传递基本数据类型
         //intent.putExtra("uname",uname);
//         intent.putExtra("uage",19);
        //传递Bundle
//         Bundle bundle=new Bundle();
//         bundle.putString("uname",uname);
//         bundle.putInt("uage",19);
//         intent.putExtra("bundle",bundle);
           //传递对象
           Person person1=new Person(1,"静静",19);
           Person person2=new Person(2,"明明",19);
           Person person3=new Person(3,"雨田君",19);

        ArrayList persons=new ArrayList<>();
        persons.add(person1);
        persons.add(person2);
        persons.add(person3);

        //intent.putExtra("persons",persons);
        //传递对象集合
        intent.putParcelableArrayListExtra("persons",persons);


         //startActivity(intent);
        //带有目的的跳转
        startActivityForResult(intent,0x201);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Log.i("test","onActivityResult");
        String content=data.getStringExtra("content");
        tv_main_showThink.setText(content);
    }
}

package com.zking.administrator.g160628_android12_activity;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

import com.zking.entity.Person;

import java.util.List;

public class ThinkActivity extends AppCompatActivity {

    private TextView tv_think_showName;
    private EditText et_think_content;

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

        tv_think_showName = (TextView) findViewById(R.id.tv_think_showName);
        et_think_content = (EditText) findViewById(R.id.et_think_content);

        //获取第一个页面传递过来的数据
//        String uname=getIntent().getStringExtra("uname");
//        int uage=getIntent().getIntExtra("uage",0);
        //接受bundle
//        Bundle bundle=getIntent().getBundleExtra("bundle");
//        String uname=bundle.getString("uname");
//        int uage=bundle.getInt("uage");
        //接受对象
        //Person person= (Person) getIntent().getSerializableExtra("person");
        //Person person=getIntent().getParcelableExtra("person");

        //接受对象集合
        List persons=getIntent().getParcelableArrayListExtra("persons");
        tv_think_showName.setTextSize(30);
        for (Person person : persons) {
            tv_think_showName.setText(tv_think_showName.getText()+"\n"+person.toString());
        }


    }

    public void ok(View view){
        String content=et_think_content.getText().toString();
        Intent intent=new Intent();
        intent.putExtra("content",content);

        //设置结果
        setResult(0x100,intent);

        //自杀(干掉自己，干掉当前的Activity)
        finish();

        //startActivity(intent);
    }
}

因为博主这里还在两个页面之间传递了对象，所以再写个实体类

package com.zking.entity;

import android.os.Parcel;
import android.os.Parcelable;

import java.io.Serializable;

/**
 * Created by Administrator on 2017/6/16 0016.
 */

public class Person implements Parcelable{
    private int pid;
    private String pname;
    private int page;

    public Person() {
    }

    public Person(int pid, String pname, int page) {
        this.pid = pid;
        this.pname = pname;
        this.page = page;
    }

    protected Person(Parcel in) {
        pid = in.readInt();
        pname = in.readString();
        page = in.readInt();
    }

    public static final Creator CREATOR = new Creator() {
        @Override
        public Person createFromParcel(Parcel in) {
            return new Person(in);
        }

        @Override
        public Person[] newArray(int size) {
            return new Person[size];
        }
    };

    public int getPid() {
        return pid;
    }

    public void setPid(int pid) {
        this.pid = pid;
    }

    public String getPname() {
        return pname;
    }

    public void setPname(String pname) {
        this.pname = pname;
    }

    public int getPage() {
        return page;
    }

    public void setPage(int page) {
        this.page = page;
    }

    @Override
    public String toString() {
        return "Person{" +
                "pid=" + pid +
                ", pname='" + pname + '\'' +
                ", page=" + page +
                '}';
    }

    @Override
    public int describeContents() {
        return 0;
    }

    //把属性写到序列化中
    @Override
    public void writeToParcel(Parcel dest, int flags) {
        dest.writeInt(pid);
        dest.writeString(pname);
        dest.writeInt(page);
    }
}

最后配置