Android中Intent中传递对象的方法,
一种是Bundle.putSerializable(Key,Object);
另一种是Bundle.putParcelable(Key, Object);
当然这些Object是有一定的条件的,前者是实现了Serializable接口,而后者是实现了Parcelable接口
过程:
第一,Object:implements Serializable 或者 implements Parcelable
第二,对象里不要包括Bitmap,不然会报错:
第三,在传递端:
Intent intent = new Intent(当前的activity.this,目标Activity.class);
Bundle mBundle = new Bundle();
mBundle.putSerializable("设置标记的key",对象Bean); 或者 mBundle.putParcelable("设置标记的key",对象Bean);
intent.putExtras(mBundle);
startActivity(intent);
第四,接收端:
对象bean= (对象bean) getIntent().getSerializableExtra("设置标记的key");
性能:
1.在使用内存的时候,Parcelable 类比Serializable性能高,所以推荐使用Parcelable类。
2.Serializable在序列化的时候会产生大量的临时变量,从而引起频繁的GC。
3.Parcelable不能使用在要将数据存储在磁盘上的情况,因为Parcelable不能很好的保证数据的持续性在外界有变化的情况下。
尽管Serializable效率低点, 也不提倡用,但在这种情况下,还是建议你用Serializable 。
示例:
import java.io.Serializable;
public class Person implements Serializable {
private static final long serialVersionUID = -7060210544600464481L;
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;
}
}
import android.os.Parcel;
import android.os.Parcelable;
public class Book implements Parcelable {
private String bookName;
private String author;
private int publishTime;
public String getBookName() {
return bookName;
}
public void setBookName(String bookName) {
this.bookName = bookName;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public int getPublishTime() {
return publishTime;
}
public void setPublishTime(int publishTime) {
this.publishTime = publishTime;
}
public static final Parcelable.Creator
public Book createFromParcel(Parcel source) {
Book mBook = new Book();
mBook.bookName = source.readString();
mBook.author = source.readString();
mBook.publishTime = source.readInt();
return mBook;
}
public Book[] newArray(int size) {
return new Book[size];
}
};
public int describeContents() {
return 0;
}
public void writeToParcel(Parcel parcel, int flags) {
parcel.writeString(bookName);
parcel.writeString(author);
parcel.writeInt(publishTime);
}
}
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 ObjectTranDemo extends Activity implements OnClickListener {
private Button sButton,pButton;
public final static String SER_KEY = "com.tutor.objecttran.ser";
public final static String PAR_KEY = "com.tutor.objecttran.par";
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setupViews();
}
public void setupViews(){
sButton = (Button)findViewById(R.id.button1);
pButton = (Button)findViewById(R.id.button2);
sButton.setOnClickListener(this);
pButton.setOnClickListener(this);
}
//Serializeable传递对象的方法
public void SerializeMethod(){
Person mPerson = new Person();
mPerson.setName("frankie");
mPerson.setAge(25);
Intent mIntent = new Intent(this,ObjectTranDemo1.class);
Bundle mBundle = new Bundle();
mBundle.putSerializable(SER_KEY,mPerson);
mIntent.putExtras(mBundle);
startActivity(mIntent);
}
//Pacelable传递对象方法
public void PacelableMethod(){
Book mBook = new Book();
mBook.setBookName("Android Tutor");
mBook.setAuthor("Frankie");
mBook.setPublishTime(2010);
Intent mIntent = new Intent(this,ObjectTranDemo2.class);
Bundle mBundle = new Bundle();
mBundle.putParcelable(PAR_KEY, mBook);
mIntent.putExtras(mBundle);
startActivity(mIntent);
}
//铵钮点击事件响应
public void onClick(View v) {
if(v == sButton){
SerializeMethod();
}else{
PacelableMethod();
}
}
}
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class ObjectTranDemo1 extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TextView mTextView = new TextView(this);
Person mPerson = (Person)getIntent().getSerializableExtra(ObjectTranDemo.SER_KEY);
mTextView.setText("You name is: " + mPerson.getName() + "\n"+
"You age is: " + mPerson.getAge());
setContentView(mTextView);
}
}
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class ObjectTranDemo2 extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
TextView mTextView = new TextView(this);
Book mBook = (Book)getIntent().getParcelableExtra(ObjectTranDemo.PAR_KEY);
mTextView.setText("Book name is: " + mBook.getBookName()+"\n"+
"Author is: " + mBook.getAuthor() + "\n" +
"PublishTime is: " + mBook.getPublishTime());
setContentView(mTextView);
}
}