Android中通过Intent传递对象类型的方法有两种，一种是Bundle.putSerializable(Key,Object),另一种是Bundle.putParcelable(Key,Object).传递这些对象要满足一定的条件，前者是实现Serializable接口，后一种是实现了Parcelable.
本文的例子是Parcelable接口的方法。
Parcelable需要实现三个函数:writeToParcel、describeContents和CREATOR.
wroteToParcel(Parcel dest,int flags)将需要数列化存储的数据写入外部提供的Parcel对象dest.
describeContent()描述值类型，直接返回0即可
static final Parcelable.Creator 对象 CREATOR:这个CREATOR命名是固定的，而它对应的接口有两个方法必须实现，createFromPrcel(Parcel source)实现从source创建出JavaBean实例的功能；newArray(int size)创建该类长度的数组。
实现Parcelable接口，代码如下:
package com.activity.transfer;
import android.os.Parcel;
import android.os.Parcelable;
public class ParcelableTest implements Parcelable
{
private String string1;
private String string2;
@Override
public int describeContents() {
// TODO Auto-generated method stub
return 0;
}
@Override
public void writeToParcel(Parcel arg0, int arg1) {
// TODO Auto-generated method stub
arg0.writeString(string1);
arg0.writeString(string2);
}
public void setString1Value(String str1)
{
this.string1 = str1;
}
public String getString1Value()
{
return this.string1;
}
public void setString2Value(String str2)
{
this.string2 = str2;
}
public String getString2Value()
{
return this.string2;
}
public static final Parcelable.Creator<ParcelableTest> CREATOR = new Creator<ParcelableTest>()
{
@Override
public ParcelableTest createFromParcel(Parcel source) {
// TODO Auto-generated method stub
ParcelableTest p = new ParcelableTest();
p.string1 = source.readString();
p.string2 = source.readString();
return p;
}
@Override
public ParcelableTest[] newArray(int size) {
// TODO Auto-generated method stub
return new ParcelableTest[size];
}
};
}
在mainActivity中创建一个按钮，点击按钮后，将构造对象传递到activity2中，在activity中取值并显示出来。
MainActivity.java代码如下:
package com.activity.transfer;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
Button button1 = null;
Button button2 = null;
EditText edit = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button1 = (Button)findViewById(R.id.button1);
button2 = (Button)findViewById(R.id.button2);
edit = (EditText)findViewById(R.id.editText1);
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent = new Intent(MainActivity.this,activity2.class);
String name = edit.getText().toString();
intent.putExtra("editText", name);
//创建对象
ParcelableTest mTest = new ParcelableTest();
mTest.setString1Value(name);
mTest.setString2Value("string2");
//绑定数据到bundle
Bundle mBundle = new Bundle();
mBundle.putParcelable("DATA", mTest);
intent.putExtras(mBundle);
startActivity(intent);
}
});
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
在activity2.java中显示出来，代码如下:
package com.activity.transfer;
import android.os.Bundle;
import android.widget.TextView;
import android.app.Activity;
import android.content.Intent;
public class activity2 extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity2);
Intent intent = this.getIntent();
String name = intent.getStringExtra("editText");
TextView text = (TextView)findViewById(R.id.textView2);
//text.setText(name);
ParcelableTest mTest = (ParcelableTest)getIntent().getParcelableExtra("DATA");
text.setText(name+"ParcelableTest传过来的值为:"+"string1是:"+mTest.getString1Value()+"string2是:"+mTest.getString2Value());
}
}
整个工程地址:
http://www.eoeandroid.com/thread-538356-1-1.html
时间： 2024-11-11 05:18:59