Android中Activity之间数据传递及返回

下面通过一个简单的Demo来说明：

一般情况下，简单的数据比如基本类型int,char等等可以使用Intent的putExtra()进行传递。这里主要是一个类通过实现Parcelable或者Serializable将数据从一个界面传递到另一个界面，以及如何从另一个界面把数据回传到第一个界面。
首先来看代码的结构：

第一步：创建IntentDemo的工程，activity_main.xml的代码如下所示：<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"> <button android:id="@+id/button01" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Serializable"> </button><button android:id="@+id/button02" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="Parcelable"> <textview android:id="@+id/textview" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text=""></textview></button></linearlayout>;

第二步：编写一个Worker类，使其实现Serializable。代码如下： package com.nanhai.demo;import java.io.Serializable;public class Worker implements Serializable {private String name;private String sex;private int age;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}}

第三步：编写一个类Boss继承Parcelable,代码如下： package com.nanhai.demo;import android.os.Parcel;import android.os.Parcelable;public class Boss implements Parcelable {private String name;private String sex;private int age;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public static final Parcelable.Creator<boss> CREATOR = new Creator<boss>() {@Overridepublic Boss[] newArray(int size) {return new Boss[size];}@Overridepublic Boss createFromParcel(Parcel source) {Boss boss = new Boss();boss.name = source.readString();boss.sex = source.readString();boss.age = source.readInt();return boss;}};@Overridepublic int describeContents() {return 0;}@Overridepublic void writeToParcel(Parcel dest, int flags) {dest.writeString(name);dest.writeString(sex);dest.writeInt(age);}}</boss></boss>

第四步：完成MainActivity逻辑部分，把数据从这个界面传递到另外两个界面：IntentParcelableActivity与IntentSerializableActivity。MainActivity界面的代码如下：package com.nanhai.demo;import java.util.ArrayList;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class MainActivity extends Activity implements OnClickListener {private ArrayList<worker> mArrayListWorkers = new ArrayList<worker>();private ArrayList<boss> mArrayListBoss = new ArrayList<boss>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);InitUI();}private void InitUI() {Button Serializable = (Button) findViewById(R.id.button01);Button Parcelable = (Button) findViewById(R.id.button02);if (Serializable != null) {Serializable.setOnClickListener(this);}if (Parcelable != null) {Parcelable.setOnClickListener(this);}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic void onClick(View v) {if (v.getId() == R.id.button01) {setSerializable();} else if (v.getId() == R.id.button02) {setParcelable();}}private void setSerializable() {Worker worker01 = new Worker();worker01.setName("daqiao");worker01.setSex("nv");worker01.setAge(18);Worker worker02 = new Worker();worker02.setName("xiaoqiao");worker02.setSex("nv");worker02.setAge(16);mArrayListWorkers.add(worker01);mArrayListWorkers.add(worker02);Intent mIntent = new Intent(this, IntentSerializableActivity.class);Bundle mBundle = new Bundle();mBundle.putSerializable("worker_key", worker01);mBundle.putSerializable("worker_Array", mArrayListWorkers);mIntent.putExtras(mBundle);startActivityForResult(mIntent, 100);}private void setParcelable() {Boss boss01 = new Boss();boss01.setName("sunce");boss01.setSex("nan");boss01.setAge(20);Boss boss02 = new Boss();boss02.setName("zhouyu");boss02.setSex("nan");boss02.setAge(19);mArrayListBoss.add(boss01);mArrayListBoss.add(boss02);Intent mIntent = new Intent(this, IntentParcelableActivity.class);Bundle mBundle = new Bundle();mBundle.putParcelable("boss_key", boss01);mBundle.putParcelableArrayList("boss_Array", mArrayListBoss);mIntent.putExtras(mBundle);startActivityForResult(mIntent, 200);}@Overrideprotected void onActivityResult(int requestCode, int resultCode, Intent data) {TextView show = (TextView) findViewById(R.id.textview);if (resultCode == RESULT_OK && requestCode == 100) {Bundle bundle = getIntent().getExtras();if (bundle != null) {mArrayListWorkers = (ArrayList<worker>) bundle.getSerializable("worker_Array");}show.setText("");show.append("IntentSerializableActivity:" + "\n");for (int i = 0; i < mArrayListWorkers.size(); i++) {Worker workerArrayList = new Worker();workerArrayList = mArrayListWorkers.get(i);show.append("Your name is:" + workerArrayList.getName() + "\n"+ "Your sex is:" + workerArrayList.getSex() + "\n"+ "Your age is:" + workerArrayList.getAge() + "\n");}} else if (resultCode == RESULT_OK && requestCode == 200) {Bundle bundle = getIntent().getExtras();if (bundle != null) {mArrayListBoss = bundle.getParcelableArrayList("boss_Array");}show.setText("");show.append("IntentParcelableActivity:" + "\n");for (int i = 0; i < mArrayListBoss.size(); i++) {Boss bossArrayList = new Boss();bossArrayList = mArrayListBoss.get(i);show.append("Your name is:" + bossArrayList.getName() + "\n"+ "Your sex is:" + bossArrayList.getSex() + "\n"+ "Your age is:" + bossArrayList.getAge() + "\n");}}}}</worker></boss></boss></worker></worker>

第五步：接收数据的两个界面IntentParcelableActivity与IntentSerializableActivity，代码分别如下：IntentParcelableActivity：
package com.nanhai.demo;import java.util.ArrayList;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.KeyEvent;import android.view.Menu;import android.widget.TextView;public class IntentParcelableActivity extends Activity {private ArrayList<boss> mArrayListBoss = new ArrayList<boss>();@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.activity_main);TextView mTextView = new TextView(this);Boss boss01 = new Boss();Bundle bundle = getIntent().getExtras();if (bundle != null) {boss01 = bundle.getParcelable("boss_key");mArrayListBoss = bundle.getParcelableArrayList("boss_Array");}mTextView.setText("");mTextView.append("name is:" + boss01.getName() + "\n" + "sex is:"+ boss01.getSex() + "\n" + "age is:" + boss01.getAge() + "\n"+ "\n");for (int i = 0; i < mArrayListBoss.size(); i++) {Boss bossArrayList = new Boss();bossArrayList = mArrayListBoss.get(i);mTextView.append("name is:" + bossArrayList.getName() + "\n"+ "sex is:" + bossArrayList.getSex() + "\n" + "age is:"+ bossArrayList.getAge() + "\n");}setContentView(mTextView);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK) {Intent intent = new Intent();Bundle mBundle = new Bundle();mBundle.putParcelableArrayList("boss_Array", mArrayListBoss);intent.putExtras(mBundle);setResult(RESULT_OK, intent);finish();}return true;}}</boss></boss>

IntentSerializableActivity：
package com.nanhai.demo;import java.util.ArrayList;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.KeyEvent;import android.view.Menu;import android.widget.TextView;public class IntentSerializableActivity extends Activity {private ArrayList<worker> mArrayListWorkers = new ArrayList<worker>();@Overrideprotected void onCreate(Bundle savedInstanceState) {// TODO Auto-generated method stubsuper.onCreate(savedInstanceState);setContentView(R.layout.activity_main);TextView mTextView = new TextView(this);Worker worker01 = new Worker();Bundle bundle = getIntent().getExtras();if (bundle != null) {worker01 = (Worker) bundle.getSerializable("worker_key");mArrayListWorkers = (ArrayList<worker>) bundle.getSerializable("worker_Array");}mTextView.setText("");mTextView.append("name is:" + worker01.getName() + "\n" + "sex is:"+ worker01.getSex() + "\n" + "age is:" + worker01.getAge()+ "\n" + "\n");for (int i = 0; i < mArrayListWorkers.size(); i++) {Worker workerArrayList = new Worker();workerArrayList = mArrayListWorkers.get(i);mTextView.append("name is:" + workerArrayList.getName() + "\n"+ "sex is:" + workerArrayList.getSex() + "\n" + "age is:"+ workerArrayList.getAge() + "\n");}setContentView(mTextView);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onKeyDown(int keyCode, KeyEvent event) {if (keyCode == KeyEvent.KEYCODE_BACK) {Intent mIntent = new Intent();Bundle mBundle = new Bundle();mBundle.putSerializable("worker_Array", mArrayListWorkers);mIntent.putExtras(mBundle);setResult(RESULT_OK, mIntent);finish();}return true;}}</worker></worker></worker>

注意：千万别忘记在清单文件AndroidManifest.xml中给IntentParcelableActivity与IntentSerializableActivity注册。