安卓开发之Activity信息传递

这个其实也是比较简单的感觉很好玩就写篇博客记录一下吧

我们都知道活动的开启是

startActivity(intent);

然后我们如果想传入值的话直接

intent.putExtra 就可以

第一个是我们的标识（我是这样理解的代表是那个信号然后第二个就是传入的参数了）

然后如果想传入类的话需要继承序列化的类

还有表示设置成全局的静变量就ok了

package com.example.lenovo.myapplication;

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

import java.io.Serializable;

public class MainActivity extends AppCompatActivity {

    public static String  Y="Y";
    public static String  C="C";
    private Button button;
    private EditText view1;
    private String str;
    public  Intent intent;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) findViewById(R.id.button);
        view1 = (EditText) findViewById(R.id.editText);
        intent = new Intent(MainActivity.this, Main2Activity.class);
        SetLister();
    }
    private void SetLister() {
        OnClick onclick=new OnClick();
        button.setOnClickListener(onclick);
    }
    private class  OnClick implements View.OnClickListener{

        @Override
        public void onClick(View v) {
            switch (v.getId())
            {
                case R.id.button:
                    str=view1.getText().toString();
                    intent.putExtra("Y",str);
                    demo d=new demo("皮皮虾",12);
                    intent.putExtra("C", (Serializable) d);
                   // Log.i("呜呜","出bug了");
                    startActivity(intent);

            }
        }
    }

}

package com.example.lenovo.myapplication;

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

public class Main2Activity extends AppCompatActivity {

    private TextView view2;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        view2=(TextView) findViewById(R.id.textView);
        Intent intent = getIntent();
        if(intent!=null)
        {
            String title = intent.getStringExtra(MainActivity.Y);
            view2.setText(title);
            demo s=(demo)intent.getSerializableExtra(MainActivity.C);
            setTitle("名字是："+ s.getUserName());
        }
    }
}

package com.example.lenovo.myapplication;

import java.io.Serializable;

/**
 * Created by Lenovo on 2019/3/16.
 */

public class demo implements Serializable {
    private String name;
    private int age;


    public String getName() {
        return name;
    }

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

    public void setName(String name) {
        this.name = name;
    }
    public String getUserName()
    {
        return this.name;
    }
    public demo(String name,int age) {
        this.name = name;
        this.age = age;
    }
}

然后效果如下

安卓开发之Activity信息传递