Activity 返回数据

AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.xiesir.example26returndata">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        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=".ContactActivity"></activity>
        <activity android:name=".HandleExceptionActivity"></activity>
        <activity android:name=".SmsActivity"></activity>
    </application>

</manifest>

item_listview.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="26sp"
        />
</LinearLayout>

activity_contact.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:id="@+id/lv"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        ></ListView>
</LinearLayout>

activity_handleexception.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/tv_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="老婆"
        android:textSize="26sp"
        />
    <TextView
        android:id="@+id/tv_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="真正的道歉是无武装地舍弃自己。老婆，我以后一切都听你的了。"
        android:textSize="26sp"
        />
</LinearLayout>

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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:orientation="vertical"
    tools:context="com.xiesir.example26returndata.MainActivity">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        >
        <EditText
            android:id="@+id/et_name"
            android:layout_weight="1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="联系人"
            android:onClick="click"
            />
    </LinearLayout>

    <EditText
        android:id="@+id/et_content"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:ems="10" >
        <requestFocus />
    </EditText>

    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="快捷回复"
            android:onClick="click2"
            />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="道歉"
            android:onClick="click3"
            />
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="发送"
            />
    </LinearLayout>
</LinearLayout>

ContactActivity.java：

package com.xiesir.example26returndata;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

/**
 * Created by xiegly on 2016/6/5.
 */
public class ContactActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_contact);

        final String[] names = new String[] {"孙悟空", "朱八戒", "撒和尚"};

        // 显示联系人列表
        ListView lv = (ListView) findViewById(R.id.lv);
        lv.setAdapter(new ArrayAdapter<String>(this, R.layout.item_listview, R.id.tv, names));

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            // position:点击某个条目时，会通过position告诉程序员点击的是哪一个条目
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent data = new Intent();
                // 把要传递的数据封装至intent中
                data.putExtra("name", names[position]);
                // 当此Activity销毁时，返回至上一个Activity时，会把这个intent对象传递给上一个Activity
                setResult(10, data);

                // 销毁当前Activity
                finish();
            }
        });

    }
}

SmsActivity.java：

package com.xiesir.example26returndata;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

/**
 * Created by xiegly on 2016/6/5.
 */
public class SmsActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_contact);

        final String[] smss = new String[]{
                "我正在上课，一会回你",
                "我将春天付给了你，将冬天留给我自己。我将你的背影留给我自己，却将自己给了你。",
                "我所认为最深沉的爱，莫过于分开以后，我将自己活成了你的样子。"
        };
        // 显示联系人列表
        ListView lv = (ListView) findViewById(R.id.lv);
        lv.setAdapter(new ArrayAdapter<String>(this, R.layout.item_listview, R.id.tv, smss));

        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent data = new Intent();
                data.putExtra("sms", smss[position]);

                setResult(20, data);
                finish();
            }
        });
    }
}

HandleExceptionActivity.java：

package com.xiesir.example26returndata;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

/**
 * Created by xiegly on 2016/6/5.
 */
public class HandleExceptionActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_handleexception);

        final TextView tv_name = (TextView) findViewById(R.id.tv_name);
        final TextView tv_content = (TextView) findViewById(R.id.tv_content);

        tv_name.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent data = new Intent();
                data.putExtra("name", tv_name.getText());

                setResult(100, data);
                finish();
            }
        });

        tv_content.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent data = new Intent();
                data.putExtra("sms", tv_content.getText());

                setResult(200, data);
                finish();
            }
        });
    }
}

MainActivity.java：

package com.xiesir.example26returndata;

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

public class MainActivity extends AppCompatActivity {

    public static final int CONTACT = 10;
    public static final int SMS = 20;
    public static final int HANDLE_EXCEPTION = 30;

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

    public void click(View v){
        Intent intent = new Intent(this, ContactActivity.class);
        //启动一个Activity去获取数据（结果）
        startActivityForResult(intent, CONTACT);
    }

    public void click2(View v){
        Intent intent = new Intent(this, SmsActivity.class);
        startActivityForResult(intent, SMS);
    }

    public void click3(View v){
        Intent intent = new Intent(this, HandleExceptionActivity.class);
        startActivityForResult(intent, HANDLE_EXCEPTION);
    }

    // 只有通过startActivityForResult启动的Activity销毁时，才会回调这个方法，方法中传入的intent就封装了返回的数据
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        //通过请求码来判断data来自哪一个Activity
        if(requestCode == CONTACT){
            String name = data.getStringExtra("name");
            EditText et_name = (EditText) findViewById(R.id.et_name);
            et_name.setText(name);
        }
        else if(requestCode == SMS){
            String sms = data.getStringExtra("sms");
            EditText et_content = (EditText) findViewById(R.id.et_content);
            et_content.setText(sms);
        }
        //先通过请求码判断data来自哪个Activity
        else if(requestCode == HANDLE_EXCEPTION){
            //通过结果码判断数据data中的数据是什么类型
            if(resultCode == 100){
                String name = data.getStringExtra("name");
                EditText et_name = (EditText) findViewById(R.id.et_name);
                et_name.setText(name);
            }
            else if(resultCode == 200){
                String sms = data.getStringExtra("sms");
                EditText et_content = (EditText) findViewById(R.id.et_content);
                et_content.setText(sms);
            }
        }
    }
}

源程序下载

参考：