Android中使用Intent在Activity之間傳遞對象(使用Serializable或者Parcelable)的方法

2020-04-11 10:55:56

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Android中的不同Activity之間傳遞對象，我們可以考慮采用Bundle.putSerializable(Key,Object);也可以考慮采用Bundle.putParcelable(Key, Object);其中前面一種方法中的Object要實(shí)現(xiàn)Serializable接口，后面一種方法中的Object要實(shí)現(xiàn)Parcelable接口。下面我們以一個(gè)完整的例子來說明。

1.新建一個(gè)Android的工程，其中該工程的目錄結(jié)構(gòu)如下圖：

2. 修改main.xml布局文件。布局文件的源碼如下：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <Button android:id="@+id/serButton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Serializable"/> <Button android:id="@+id/parButton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="Parcelable"/> </LinearLayout>

3.在工程的src目錄下新建一個(gè)實(shí)體類包，命名為com.andy.entity.同時(shí)在該package中添加兩個(gè)實(shí)體類，一個(gè)是Person.java，該類實(shí)現(xiàn)Serializable接口；一個(gè)是Police.java，該類實(shí)現(xiàn)Parcelable接口。代碼分別如下：

Person.java:package com.andy.entity; import java.io.Serializable; public class Person implements Serializable { private static final long serialVersionUID = -6919461967497580385L; private String name; private int age; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } } Police.java:[c-sharp] view plain copypackage com.andy.entity; import android.os.Parcel; import android.os.Parcelable; public class Police implements Parcelable { private String name; private int workTime; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getWorkTime() { return workTime; } public void setWorkTime(int workTime) { this.workTime = workTime; } public static final Parcelable.Creator<Police> CREATOR = new Creator<Police>() { @Override public Police createFromParcel(Parcel source) { Police police = new Police(); police.name = source.readString(); police.workTime = source.readInt(); return police; } @Override public Police[] newArray(int size) { return new Police[size]; } }; @Override public int describeContents() { return 0; } @Override public void writeToParcel(Parcel parcel, int flags) { parcel.writeString(name); parcel.writeInt(workTime); } }

4.在包c(diǎn)om.andy.testdemo中修改TestActivity.java類，同時(shí)在該包中添加類SerializableDemo和ParcelableDemo，分別繼承了Activity類和分別顯示Person對象和Police對象的數(shù)據(jù)。代碼如下：

package com.andy.testdemo; import com.andy.entity.Person; import com.andy.entity.Police; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.View; import android.widget.Button; public class TestActivity extends Activity { private Button sButton,pButton; public final static String SER_KEY = "com.andy.ser"; public final static String PAR_KEY = "com.andy.par"; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); sButton = (Button)findViewById(R.id.serButton); sButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { SerializeMethod(); } }); pButton = (Button)findViewById(R.id.parButton); pButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { PacelableMethod(); } }); } /** * Serializeable傳遞對象的方法 */ private void SerializeMethod(){ Person mPerson = new Person(); mPerson.setName("andy"); mPerson.setAge(26); Intent mIntent = new Intent(this,SerializableDemo.class); Bundle mBundle = new Bundle(); mBundle.putSerializable(SER_KEY,mPerson); mIntent.putExtras(mBundle); startActivity(mIntent); } /** * Pacelable傳遞對象方法 */ private void PacelableMethod(){ Police mPolice = new Police(); mPolice.setName("I am Police"); mPolice.setWorkTime(2008); Intent mIntent = new Intent(this,ParcelableDemo.class); Bundle mBundle = new Bundle(); mBundle.putParcelable(PAR_KEY, mPolice); mIntent.putExtras(mBundle); startActivity(mIntent); } }

SerializableDemo.java類

package com.andy.testdemo; import com.andy.entity.Person; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class SerializableDemo extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView mTextView = new TextView(this); Person mPerson = (Person)getIntent().getSerializableExtra(TestActivity.SER_KEY); mTextView.setText("You name is: " + mPerson.getName() + "/n"+ "You age is: " + mPerson.getAge()); setContentView(mTextView); } }

ParcelableDemo.java類：

package com.andy.testdemo; import com.andy.entity.Police; import android.app.Activity; import android.os.Bundle; import android.widget.TextView; public class ParcelableDemo extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView mTextView = new TextView(this); Police mPolice = (Police)getIntent().getParcelableExtra(TestActivity.PAR_KEY); mTextView.setText("Police name is: " + mPolice.getName()+"/n"+ "WorkTime is: " + mPolice.getWorkTime() + "/n"); setContentView(mTextView); } }

5.在AndroidManifest.xml文件中為新添加的兩個(gè)Activity進(jìn)行注冊。

<?xml version="1.0" encoding="utf-8"?> <manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.andy.testdemo" android:versionCode="1" android:versionName="1.0"> <application android:icon="@drawable/icon" android:label="@string/app_name"> <activity android:name=".TestActivity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".SerializableDemo"/> <activity android:name=".ParcelableDemo"/> </application> <uses-sdk android:minSdkVersion="8" /> </manifest>

6.運(yùn)行程序查看效果圖：

【1】主界面截圖：