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Android studio ：活动间的通信

程序员文章站 2022-04-19 14:01:48
PutActivityMainActivity.javapackage com.example.putactivity;import android.content.Intent;import androidx.appcompat.app.AppCompatActivity;import android.os.Bundle;import android.view.View;import android.widget.Button;public class MainActivity ext...

PutActivity
MainActivity.java

package com.example.putactivity;

import android.content.Intent;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    Bundle bundle = new Bundle();//创建bundle对象
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn = findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                bundle.putString("key1","小明");//bandle对象携带压入字符串数据
                bundle.putInt("key2",18);//bandle对象压入整形数据
                Intent intent = new Intent(MainActivity.this,Main2Activity.class);
                intent.putExtras(bundle);//使用Intetnt携带bundle对象
                startActivity(intent);//启动活动
            }
        });
    }
}

Main2Activity.java

package com.example.putactivity;

import android.content.Intent;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class Main2Activity extends AppCompatActivity {
   Intent intent;//定义Intent对象
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        TextView tv1 = findViewById(R.id.tv1);
        TextView tv2 = findViewById(R.id.tv2);
        intent = getIntent();//获取intent对象
        //通过intent对象获取数据
        String name = intent.getStringExtra("key1");
        int age = intent.getIntExtra("key2",0);
        tv1.setText("用户名为："+name);//显示数据
        tv2.setText("年龄为："+age);
    }
}

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <Button
        android:id="@+id/btn"
        android:layout_marginTop="10dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动新活动"/>
</LinearLayout>

Activity_main2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Main2Activity"
    android:orientation="vertical">
    <TextView
        android:id="@+id/tv1"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    <TextView
        android:id="@+id/tv2"
        android:layout_marginLeft="10dp"
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

Android studio ：活动间的通信
Android studio ：活动间的通信
ResultActivity
MainActivity.java

package com.example.resultactivity;

import android.content.Intent;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn = findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Intent intent = new Intent(MainActivity.this, Main2Activity.class);
                //第一个参数是intent,第二个参数是请求码，随便定义，保证是唯一的就行
                startActivityForResult(intent, 1);
            }
        });
    }
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //这里要通过请求码来判断数据的来源
        switch (requestCode) {
            case 1:
                //判断请求的结果是否成功，resultCode == RESULT_OK，代表成功了
                if (resultCode == RESULT_OK) {
                    String name = data.getStringExtra("key1");
                    String age = data.getStringExtra("key2");
                    Toast.makeText(MainActivity.this, "姓名："+name+"年龄："+age, Toast.LENGTH_LONG).show();
                }
                break;
            /**这里可以有多个requestcode**/
            default:
        }
    }
}

Main2Activity.java

package com.example.resultactivity;

import android.content.Intent;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.text.Editable;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class Main2Activity extends AppCompatActivity {
    String name;//定义名称字符串串
    String age;//定义年龄整形
    EditText et1,et2;//定义编辑框对象
    Intent intent;//定义Intent对象
    Bundle bundle = new Bundle();//定义bundle对象
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        et1 = findViewById(R.id.et1);
        et2 = findViewById(R.id.et2);
        Button btn = findViewById(R.id.btn);
        //设置按钮监听事件
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                intent = new Intent();//定义Intent
                //获取用户输入数据
                name = et1.getText().toString();
                age = et2.getText().toString();
                //压入数据
                bundle.putString("key1",name);
                bundle.putString("key2",age);
                intent.putExtras(bundle);//传递bundle对象
                setResult(RESULT_OK,intent);//设置返回消息码
                finish();//关闭该活动页面
            }
        });
    }
}

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Main2Activity"
    android:orientation="vertical">
    <EditText
        android:id="@+id/et1"
        android:layout_marginTop="20dp"
        android:layout_marginLeft="10dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入姓名"/>
    <EditText
        android:id="@+id/et2"
        android:layout_marginTop="20dp"
        android:layout_marginLeft="10dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="请输入年龄"/>
    <Button
        android:id="@+id/btn"
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="提交"/>
</LinearLayout>

Activity_main2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <Button
        android:id="@+id/btn"
        android:layout_marginTop="10dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="跳转至新页面"/>
</LinearLayout>

Android studio ：活动间的通信
Android studio ：活动间的通信
StaticActivity
MainActivity.java

package com.example.staticactivity;

import android.content.Intent;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button btn = findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                //给新活动中的静态成员赋值
                Main2Activity.name = "小明";
                Main2Activity.age = 18;
                //创建Intent对象
                Intent intent = new Intent(MainActivity.this,Main2Activity.class);
                startActivity(intent);//启动活动
            }
        });
    }
}

Main2Activity.java

package com.example.staticactivity;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class Main2Activity extends AppCompatActivity {
    public static String name="";
    public static int age=0;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
        //将传入的数据打印显示
        Toast.makeText(Main2Activity.this,"姓名："+name+" 年龄:"+age,Toast.LENGTH_SHORT).show();
    }
}

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <Button
        android:id="@+id/btn"
        android:layout_marginTop="20dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="跳转至新页面"/>
</LinearLayout>

Activity_main2.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".Main2Activity"
    android:orientation="vertical">
    <TextView
        android:layout_marginTop="20dp"
        android:layout_marginLeft="10dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="新活动"/>

</LinearLayout>

Android studio ：活动间的通信
Android studio ：活动间的通信

本文地址：https://blog.csdn.net/ITarmi/article/details/107207572

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