Android Activity之间的传值示例

AndroidManifest.xml

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

    <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/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
        android:name=".MyActivity"
        android:label="@string/title_activity_my_activity2" >
        </activity>
    </application>

</manifest>

MainActivity.java

package online.geekgalaxy.activityargsdelivery;

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

public class MainActivity extends AppCompatActivity {

    private Button btnregister;
    private EditText editname;
    private RadioGroup rad;

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

        btnregister = (Button)findViewById(R.id.btnregister);
        editname = (EditText)findViewById(R.id.editname);
        rad = (RadioGroup)findViewById(R.id.radioGroup);
        btnregister.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name,sex = "";
                Intent it = new Intent(MainActivity.this,MyActivity.class);

                name = editname.getText().toString();

                //遍历RadioGroup找出被选中的单选按钮
                for(int i = 0;i < rad.getChildCount();i++)
                {
                    RadioButton rd = (RadioButton)rad.getChildAt(i);
                    if(rd.isChecked())
                    {
                        sex = rd.getText().toString();
                        break;
                    }
                }

                //新建Bundle对象,并把数据写入
                Bundle bd = new Bundle();
                bd.putCharSequence("user",name);
                bd.putCharSequence("sex",sex);

                //将数据包Bundle绑定到Intent上
                it.putExtras(bd);
                startActivity(it);
                //关闭第一个Activity
                finish();

            }
        });
    }
}

MyActivity.java

package online.geekgalaxy.activityargsdelivery;

/**
 * Created by jailman on 2017/10/17.
 */

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

public class MyActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_2);

        TextView txtshow = (TextView) findViewById(R.id.txtshow);
        //获得Intent对象,并且用Bundle出去里面的数据
        Intent it = getIntent();
        Bundle bd = it.getExtras();

        //按键值的方式取出Bundle中的数据
        String name = bd.getCharSequence("user").toString();
        String sex = bd.getCharSequence("sex").toString();
        txtshow.setText("尊敬的"+ name + " " + sex + "士"+"恭喜你,注册成功~");
    }

}

layout

activity_main.xml

<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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="请输入注册信息:"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="用户名:"/>

        <EditText
            android:hint="请输入用户名"
            android:id="@+id/editname"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">
        <TextView
            android:layout_marginTop="10dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="性   别:"
            />

        <RadioGroup
            android:id="@+id/radioGroup"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="horizontal">

            <RadioButton
                android:id="@+id/btnman"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="男"
                android:checked="true"/>

            <RadioButton
                android:id="@+id/btnwoman"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="女"/>
        </RadioGroup>
    </LinearLayout>

    <Button
        android:id="@+id/btnregister"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="注册"/>

</LinearLayout>

activity_2.xml

<RelativeLayout 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="online.geekgalaxy.activityargsdelivery.MyActivity">

    <TextView
        android:id="@+id/txtshow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</RelativeLayout>

values

strings.xml

<resources>
    <string name="app_name">ActivityArgsDelivery</string>
    <string name="hello_world">Hello world!</string>
    <string name="action_settings">Settings</string>
    <string name="title_activity_my_activity2">MyActivity2</string>
</resources>

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 26
    buildToolsVersion "26.0.2"
    defaultConfig {
        applicationId "online.geekgalaxy.activityargsdelivery"
        minSdkVersion 25
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.+'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'
}