Android Studio基础项目-两个Activity的Intent跳转与传值，并onActivityResult回传一个/多个值，与回传消息内容。

内容如图：

android studio数据回调 android studio数据回传_bundle

代码接该章节：

一、简单传值

第一步：在MainActivty.java

android studio数据回调 android studio数据回传_bundle_02

第二步：重新方法

android studio数据回调 android studio数据回传_java_03

第三步：打印回传数据值信息

android studio数据回调 android studio数据回传_android studio数据回调_04

MainActivty.java的代码内容：

package com.xwb.userintent;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.renderscript.RenderScript;
import android.util.Log;
import android.view.View;

import com.xwb.userintent.model.User;

import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {
    public void tiaozhuan(View v){
        Intent intent = new Intent();//跳转意图
        //告诉意图，想从哪个界面跳转到哪里
        intent.setClass(MainActivity.this,MainActivity_sec.class);//跳转的源、目的

        //发送数据，java基本数据类型有8类，不支持Map类型。设置完数据后，需要到MainActivity_sec.activity中接收数据
        intent.putExtra("name","haha");
        intent.putExtra("age",20);//int型数据
        intent.putExtra("aihao",new String[]{"唱歌","打游戏"});

        //使用Bundle，发送数据
        Bundle bundle = new Bundle();//创建
        bundle.putInt("score",100);//设置score值为100
        bundle.putString("info","这里是Bundle传值");
        intent.putExtras(bundle);//关键处，把bundle值传给intent

        //传自定义数据，发送数据
        User user = new User("lidada","123456",40);
        intent.putExtra("user",user);

        //startActivity(intent);//执行跳转
        startActivityForResult(intent,100);//第1步设置回传值
    }

    //第2步重新方法
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Log.i("MainActivity","onActivityResult");//打印该方法是否回传数据值信息
    }

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

第4步：运行APP，当中必须点击返回按钮，才能看到是否回传信息

android studio数据回调 android studio数据回传_android_05

android studio数据回调 android studio数据回传_java_06

二、通过requestCode的单一值来判断执行事件

android studio数据回调 android studio数据回传_java_07

package com.xwb.userintent;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.renderscript.RenderScript;
import android.util.Log;
import android.view.View;

import com.xwb.userintent.model.User;

import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {
    public void tiaozhuan(View v){
        Intent intent = new Intent();//跳转意图
        //告诉意图，想从哪个界面跳转到哪里
        intent.setClass(MainActivity.this,MainActivity_sec.class);//跳转的源、目的

        //发送数据，java基本数据类型有8类，不支持Map类型。设置完数据后，需要到MainActivity_sec.activity中接收数据
        intent.putExtra("name","haha");
        intent.putExtra("age",20);//int型数据
        intent.putExtra("aihao",new String[]{"唱歌","打游戏"});

        //使用Bundle，发送数据
        Bundle bundle = new Bundle();//创建
        bundle.putInt("score",100);//设置score值为100
        bundle.putString("info","这里是Bundle传值");
        intent.putExtras(bundle);//关键处，把bundle值传给intent

        //传自定义数据，发送数据
        User user = new User("lidada","123456",40);
        intent.putExtra("user",user);

        //startActivity(intent);//执行跳转
        startActivityForResult(intent,100);//第1步设置回传值
    }

    //第2步重新方法
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Log.i("MainActivity","onActivityResult");//打印该方法是否回传数据值信息
        switch (requestCode){//通过requestCode值来判断执行事件
            case 100:
                Log.i("MainActivity",""+requestCode+"."+resultCode);
        }
    }

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

 

运行app

android studio数据回调 android studio数据回传_android studio数据回调_08

三、通过requestCode的多个值来判断执行事件

第一步：在xml页面增加一个返回按钮，并添加点击事件

android studio数据回调 android studio数据回传_android studio数据回调_09

<?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"
    android:background="@color/purple_500"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <Button
        android:onClick="back"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="返回"/>


    <Button
        android:id="@+id/sec"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第二个Activity的显示界面"/>

</LinearLayout>

第二步：在java代码中增加back的点击事件

android studio数据回调 android studio数据回传_android_10

 

android studio数据回调 android studio数据回传_android studio数据回调_11

package com.xwb.userintent;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

import androidx.appcompat.app.AppCompatActivity;

import com.xwb.userintent.model.User;

import java.io.Serializable;
import java.lang.reflect.Array;
import java.util.Arrays;

public class MainActivity_sec extends AppCompatActivity {

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

        //接收MainActivity的传过来的数据值，并保存到相应值中
        Intent intent = getIntent();
        int age = intent.getIntExtra("age",0);//接收第一个int型数据，没有就使用默认值0
        int score = intent.getIntExtra("score",0);//没有使用bundle时值为0,使用后为100，bundle接受数据
        String name = intent.getStringExtra("name");
        String[] aihao = intent.getStringArrayExtra("aihao");

        //自定义类User.class接收数据
        Serializable user = (User)intent.getSerializableExtra("user");

        Log.i("MainActivity_sec",age+"  显示年龄");
        Log.i("MainActivity_sec",score+"  显示分数");
        Log.i("MainActivity_sec",name+"   显示姓名");
        Log.i("MainActivity_sec", Arrays.toString(aihao));
        Log.i("MainActivity_sec",user.toString());//打印user自定义数据
    }

    public void back(View v){//“返回”按钮的方法
        Intent intent = new Intent();
        intent.putExtra("msg","这是从MainActivity返回来的数据");
        setResult(200,intent);
        finish();//关闭activty,效果等同于返回按钮
    }
}

第三步：运行APP

android studio数据回调 android studio数据回传_bundle_12

四、回传值与消息内容

android studio数据回调 android studio数据回传_java_13

package com.xwb.userintent;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.renderscript.RenderScript;
import android.util.Log;
import android.view.View;

import com.xwb.userintent.model.User;

import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {
    public void tiaozhuan(View v){
        Intent intent = new Intent();//跳转意图
        //告诉意图，想从哪个界面跳转到哪里
        intent.setClass(MainActivity.this,MainActivity_sec.class);//跳转的源、目的

        //发送数据，java基本数据类型有8类，不支持Map类型。设置完数据后，需要到MainActivity_sec.activity中接收数据
        intent.putExtra("name","haha");
        intent.putExtra("age",20);//int型数据
        intent.putExtra("aihao",new String[]{"唱歌","打游戏"});

        //使用Bundle，发送数据
        Bundle bundle = new Bundle();//创建
        bundle.putInt("score",100);//设置score值为100
        bundle.putString("info","这里是Bundle传值");
        intent.putExtras(bundle);//关键处，把bundle值传给intent

        //传自定义数据，发送数据
        User user = new User("lidada","123456",40);
        intent.putExtra("user",user);

        //startActivity(intent);//执行跳转
        startActivityForResult(intent,100);//第1步设置回传值
    }

    //第2步重新方法
    //requestCode请求码与startActivityForResult（）中requestCode一致;
    // resultCode结果码，由上一个页面返回的setResult（）设置;
    // Intent data上一个界面的返回的数据对象
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Log.i("MainActivity","onActivityResult");//打印该方法是否回传数据值信息
        switch (requestCode){//通过requestCode值来判断执行事件
            case 100:
                String msg = data.getStringExtra("msg");
                Log.i("MainActivity",""+requestCode+"."+resultCode+"."+msg);
        }
    }

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

运行APP

android studio数据回调 android studio数据回传_android_14

-------------------------------------------------------------------------------------------------------------------

完整代码

android studio数据回调 android studio数据回传_android_15


<?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"
    android:background="@color/purple_200"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/main"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第一个Activity会跳转的界面"
        android:onClick="tiaozhuan"
        />

</LinearLayout>


android studio数据回调 android studio数据回传_android studio数据回调_16


<?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"
    android:background="@color/purple_500"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <Button
        android:onClick="back"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="返回"/>


    <Button
        android:id="@+id/sec"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="第二个Activity的显示界面"/>

</LinearLayout>


android studio数据回调 android studio数据回传_android studio数据回调_17

package com.xwb.userintent;

import androidx.annotation.Nullable;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.renderscript.RenderScript;
import android.util.Log;
import android.view.View;

import com.xwb.userintent.model.User;

import java.util.HashMap;
import java.util.Map;

public class MainActivity extends AppCompatActivity {
    public void tiaozhuan(View v){
        Intent intent = new Intent();//跳转意图
        //告诉意图，想从哪个界面跳转到哪里
        intent.setClass(MainActivity.this,MainActivity_sec.class);//跳转的源、目的

        //发送数据，java基本数据类型有8类，不支持Map类型。设置完数据后，需要到MainActivity_sec.activity中接收数据
        intent.putExtra("name","haha");
        intent.putExtra("age",20);//int型数据
        intent.putExtra("aihao",new String[]{"唱歌","打游戏"});

        //使用Bundle，发送数据
        Bundle bundle = new Bundle();//创建
        bundle.putInt("score",100);//设置score值为100
        bundle.putString("info","这里是Bundle传值");
        intent.putExtras(bundle);//关键处，把bundle值传给intent

        //传自定义数据，发送数据
        User user = new User("lidada","123456",40);
        intent.putExtra("user",user);

        //startActivity(intent);//执行跳转
        startActivityForResult(intent,100);//第1步设置回传值
    }

    //第2步重新方法
    //requestCode请求码与startActivityForResult（）中requestCode一致;
    // resultCode结果码，由上一个页面返回的setResult（）设置;
    // Intent data上一个界面的返回的数据对象
    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        Log.i("MainActivity","onActivityResult");//打印该方法是否回传数据值信息
        switch (requestCode){//通过requestCode值来判断执行事件
            case 100:
                String msg = data.getStringExtra("msg");
                Log.i("MainActivity",""+requestCode+"."+resultCode+"."+msg);
        }
    }

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


android studio数据回调 android studio数据回传_android studio数据回调_18


package com.xwb.userintent;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

import androidx.appcompat.app.AppCompatActivity;

import com.xwb.userintent.model.User;

import java.io.Serializable;
import java.lang.reflect.Array;
import java.util.Arrays;

public class MainActivity_sec extends AppCompatActivity {

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

        //接收MainActivity的传过来的数据值，并保存到相应值中
        Intent intent = getIntent();
        int age = intent.getIntExtra("age",0);//接收第一个int型数据，没有就使用默认值0
        int score = intent.getIntExtra("score",0);//没有使用bundle时值为0,使用后为100，bundle接受数据
        String name = intent.getStringExtra("name");
        String[] aihao = intent.getStringArrayExtra("aihao");

        //自定义类User.class接收数据
        Serializable user = (User)intent.getSerializableExtra("user");

        Log.i("MainActivity_sec",age+"  显示年龄");
        Log.i("MainActivity_sec",score+"  显示分数");
        Log.i("MainActivity_sec",name+"   显示姓名");
        Log.i("MainActivity_sec", Arrays.toString(aihao));
        Log.i("MainActivity_sec",user.toString());//打印user自定义数据
    }

    public void back(View v){//“返回”按钮的方法
        Intent intent = new Intent();
        intent.putExtra("msg","这是从MainActivity返回来的数据");
        setResult(200,intent);
        finish();//关闭activty,效果等同于返回按钮
    }
}


android studio数据回调 android studio数据回传_java_19


package com.xwb.userintent.model;

import java.io.Serializable;

/**JavaBean**/
public class User implements Serializable {//在该自定义User类放置自定义的部分数据，大部分情况数据来源于自定义类，如：数据库也多用于此类
    private String name;
    private String password;
    private int age;

    public User(){

    }
    public User(String name,String password,int age){
        this.name = name;
        this.password = password;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public int getAge() {
        return age;
    }

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

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", password='" + password + '\'' +
                ", age=" + age +
                '}';
    }
}

android studio数据回调 android studio数据回传_android_20


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.xwb.userintent">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/Theme.Design.NoActionBar">
        <activity android:name=".MainActivity_sec">/
        </activity>
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>


android studio数据回调 android studio数据回传_java_21


plugins {
    id 'com.android.application'
}

android {
    compileSdkVersion 28
    buildToolsVersion "30.0.3"

    defaultConfig {
        applicationId "com.xwb.userintent"
        minSdkVersion 21
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
}

dependencies {

    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'com.google.android.material:material:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    testImplementation 'junit:junit:4.+'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
}