bundle.putParcelable可以實現傳遞對象,但是這個對象的類必須實現Parcelable介面才能夠使用。
下面是一個簡單的在Activity之間傳遞對象的例子。
parcel實現參數的序列化,把類對象序列化為齊位的二進位流,提高傳輸的效率。
Parcelable類。最主要的類,也就是我們要傳送的對象的類,需要實現Parcelable介面。
[java]
import android.os.Parcel;
import android.os.Parcelable;
public class BenParcelable implements Parcelable {
public String name;
public int age;
public String profession;
public BenParcelable(String name, int age, String profession) {
this.name = name;
this.age = age;
this.profession = profession;
}
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;
}
public String getprofession() {
return profession;
}
public void setprofession(String profession) {
this.profession = profession;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel parcel, int flag) {
parcel.writeString(name);
parcel.writeInt(age);
parcel.writeString(profession);
}
public static final Creator<BenParcelable> CREATOR = new Creator<BenParcelable>() {
public BenParcelable createFromParcel(Parcel in) {
return new BenParcelable(in);
}
public BenParcelable[] newArray(int size) {
return new BenParcelable[size];
}
};
private BenParcelable(Parcel in) {
name = in.readString();
age = in.readInt();
profession = in.readString();
}
}
import android.os.Parcel;
import android.os.Parcelable;
public class BenParcelable implements Parcelable {
public String name;
public int age;
public String profession;
public BenParcelable(String name, int age, String profession) {
this.name = name;
this.age = age;
this.profession = profession;
}
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;
}
public String getprofession() {
return profession;
}
public void setprofession(String profession) {
this.profession = profession;
}
@Override
public int describeContents() {
return 0;
}
@Override
public void writeToParcel(Parcel parcel, int flag) {
parcel.writeString(name);
parcel.writeInt(age);
parcel.writeString(profession);
}
public static final Creator<BenParcelable> CREATOR = new Creator<BenParcelable>() {
public BenParcelable createFromParcel(Parcel in) {
return new BenParcelable(in);
}
public BenParcelable[] newArray(int size) {
return new BenParcelable[size];
}
};
private BenParcelable(Parcel in) {
name = in.readString();
age = in.readInt();
profession = in.readString();
}
}
ParcelableActivity類,傳遞對象的Activity類。
[java]
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;
public class ParcelableActivity extends Activity {
private Button myButton;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton = (Button) findViewById(R.id.myButton);
myButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
BenParcelable benParcelable = new BenParcelable("BenZeph", 23,
"Java/Android Engineer");
Intent intent = new Intent();
intent.setClass(getApplicationContext(),
GetParcelableActivity.class);
Bundle bundle = new Bundle();
bundle.putParcelable("Ben", benParcelable);
intent.putExtras(bundle);
startActivity(intent);
}
});
}
}
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;
public class ParcelableActivity extends Activity {
private Button myButton;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
myButton = (Button) findViewById(R.id.myButton);
myButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
BenParcelable benParcelable = new BenParcelable("BenZeph", 23,
"Java/Android Engineer");
Intent intent = new Intent();
intent.setClass(getApplicationContext(),
GetParcelableActivity.class);
Bundle bundle = new Bundle();
bundle.putParcelable("Ben", benParcelable);
intent.putExtras(bundle);
startActivity(intent);
}
});
}
}
GetParcelableActivity類,接收序列化對象的Activity類。
[java]
<SPAN style="FONT-SIZE: 18px"><STRONG>import android.app.Activity;
import android.os.Bundle;
public class GetParcelableActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
BenParcelable parcelable = getIntent().getParcelableExtra("Ben");
System.out.println(parcelable.getName());
System.out.println(parcelable.getAge());
System.out.println(parcelable.getprofession());
}
} </STRONG></SPAN>
import android.app.Activity;
import android.os.Bundle;
public class GetParcelableActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
BenParcelable parcelable = getIntent().getParcelableExtra("Ben");
System.out.println(parcelable.getName());
System.out.println(parcelable.getAge());
System.out.println(parcelable.getprofession());
}
}