在Android中,兩個Acitivity之間是靠Intent傳遞資訊的,因為Intent本來就起到信使的作用,所以用它來傳遞資料也顯得順理成章了.

Intent 提供了多個方法來"攜帶"額外的資料

putExtras(Bundle data): 向Intent中放入需要"攜帶"的資料

putXxx(String key,Xxx date):向Bundle放入Int,Long等各種型別的資料(Xxx指代各種資料型別的名稱)

putSerializable(String key,Serializable date):向Bundle中放入一個可序列化的物件.

當然Intent也提供了相應的取出"攜帶"資料的方法

getXxx(String key):從Bundle取出Int,Long 等各種資料型別的資料.

getSerializable(String Key,Serializable data): 從Bundle取出一個可序列化的物件.

下面以使用getSerializable為例,定義一個可序列化的Person類,模擬一個使用者註冊的過程,通過註冊那個視窗(Acitivity)傳遞註冊資訊到另一個視窗

下面是定義的一個DTO類Person用來記錄註冊的資訊,注意!要定義成可序列化的類,繼承Serializable

package WangLi.Activity.Bundle;import java.io.Serializable;public
 
 class Person implements Serializable {    private String _Name;    private String _Passwd;    private String _Gender;    public String getName()    {     return _Name;    }    public String getPass()    {     return _Passwd;    }    public String getGender()    {     return _Gender;    }    public Person
 
(String Name,String Passwd,String Gender)    {     this._Name = Name;     this._Passwd = Passwd;     this._Gender = Gender;    }}

填入註冊資訊後,點"註冊"後跳到新視窗,顯示剛剛輸入的資訊

下面是註冊視窗,介面xml 和程式碼

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TableLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content" >               <TextView             android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:text="請輸入您的註冊資訊"            android:textSize="20sp"            />                <TableRow>            <TextView                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:text="使用者名稱:"                android:textSize="16sp"            />                        <EditText                android:id="@+id/name"                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:hint="請填寫想註冊的賬號"                android:selectAllOnFocus="true"             />        </TableRow>        <TableRow>            <TextView                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:text="密碼:"                android:textSize="16sp"            />            <EditText                android:id="@+id/passwd"                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:password = "true"                android:selectAllOnFocus="true"             />        </TableRow>        <TableRow>            <TextView                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:text="性別"                android:textSize="16sp"            />            <RadioGroup                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:orientation="horizontal"            >                <RadioButton                     android:id="@+id/male"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:text="男"                    android:textSize="16sp"                    />                 <RadioButton                     android:id="@+id/female"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:text="女"                    android:textSize="16sp"                    />            </RadioGroup>        </TableRow>        <TableRow>            <Button                android:id="@+id/bn"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text='註冊'                android:textSize="16sp"                />        </TableRow>    </TableLayout></LinearLayout>

package WangLi.Activity.Bundle;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.RadioButton;public class BundleTest extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        Button bn = (Button)findViewById(R.id.bn);        bn.setOnClickListener(new OnClickListener()        {         public void onClick(View v)         {          EditText name = (EditText)findViewById(R.id.name);          EditText passwd = (EditText)findViewById(R.id.passwd);          RadioButton male = (RadioButton)findViewById(R.id.male);          String gender = male.isChecked() ? "男" : "女";          Person p = new Person(name.getText().toString(),passwd.getText().toString(),gender);          //建立Bundle物件          Bundle data = new Bundle();          data.putSerializable("person", p);          //建立一個Intent          Intent intent = new Intent(BundleTest.this,ResultActivity.class);          intent.putExtras(data);          //啟動intent對應的Activity          startActivity(intent);         }        });    }}

第二個接受資訊視窗介面xml 及程式碼

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <TableLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content" >               <TextView             android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:text="請輸入您的註冊資訊"            android:textSize="20sp"            />                <TableRow>            <TextView                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:text="使用者名稱:"                android:textSize="16sp"            />                        <EditText                android:id="@+id/name"                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:hint="請填寫想註冊的賬號"                android:selectAllOnFocus="true"             />        </TableRow>        <TableRow>            <TextView                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:text="密碼:"                android:textSize="16sp"            />            <EditText                android:id="@+id/passwd"                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:password = "true"                android:selectAllOnFocus="true"             />        </TableRow>        <TableRow>            <TextView                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:text="性別"                android:textSize="16sp"            />            <RadioGroup                android:layout_width="fill_parent"                android:layout_height="wrap_content"                android:orientation="horizontal"            >                <RadioButton                     android:id="@+id/male"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:text="男"                    android:textSize="16sp"                    />                 <RadioButton                     android:id="@+id/female"                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:text="女"                    android:textSize="16sp"                    />            </RadioGroup>        </TableRow>        <TableRow>            <Button                android:id="@+id/bn"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                android:text='註冊'                android:textSize="16sp"                />        </TableRow>    </TableLayout></LinearLayout>

package WangLi.Activity.Bundle;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.widget.TextView;public class ResultActivity extends Activity {     @Override     public void onCreate(Bundle savedInstanceState)     {      super.onCreate(savedInstanceState);      setContentView(R.layout.result);      TextView name = (TextView)findViewById(R.id.name);      TextView passwd = (TextView)findViewById(R.id.passwd);      TextView gender = (TextView)findViewById(R.id.gender);      //獲取啟動該Result的Intent      Intent intent = getIntent();      //獲取該intent所攜帶的資料      Bundle data = intent.getExtras();      //從Bundle包中取出資料      Person p = (Person)data.getSerializable("person");      name.setText("使用者名稱:"+p.getName());      passwd.setText("密碼:"+p.getPass());      gender.setText("性別:"+p.getGender());     }}

當然,最後也別忘了把所有Activity都加入AndroidManifest.xml中