android 用Parcelable传递图片等复杂数据类型

这是我13年在eoeandroid上发的文章，由于eoe改版导致代码找不到了，搬到csdn来做个备份

1. activity_main.xml

//主界面布局只有一个button，用来跳转到另外一个activity

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:paddingBottom="@dimen/activity_vertical_margin"

    android:paddingLeft="@dimen/activity_horizontal_margin"

    android:paddingRight="@dimen/activity_horizontal_margin"

    android:paddingTop="@dimen/activity_vertical_margin"

    tools:context=".MainActivity" >

    <Button

        android:id="@+id/sendobj"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:text="@string/sendobj" />

</RelativeLayout>

2. another.xml

//接收复杂数据类型的activity的布局文件，这里主要是接收一个Bitmap对象

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent" >

 

    <ImageView

        android:id="@+id/imgview"

        android:layout_width="100dp"

        android:layout_height="100dp"

        android:contentDescription="@string/hello_world"

        android:paddingLeft="10dp"

        android:paddingRight="10dp" />

 

    <TextView

        android:id="@+id/txtview"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/imgview"

        android:paddingBottom="10dp"

        android:textColor="#CC0033"

        android:textSize="16dp" />

</RelativeLayout>

3. ObjBean.java

//创建一个bean类

package com.example.passobjdemo;

import android.graphics.Bitmap;

public class ObjBean {

private int id;
private String name;
private double price;
private Bitmap bitmap;

public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public Bitmap getBitmap() {
return bitmap;
}
public void setBitmap(Bitmap bitmap) {
this.bitmap = bitmap;
}
public String toString() {
return "id=" + id + ", name=" + name + ", price=" + price;
}

}

4. ParcelableUtil.java

package com.example.passobjdemo;

import android.graphics.Bitmap;

import android.os.Parcel;

import android.os.Parcelable;

/*

 *  Android传递复杂类型，Activity之间传递数据是通过Intent实现的。

 *  Android序列化对象主要有两种方法，实现Serializable接口、或者实现Parcelable接口。

 *  Parcelable是Android API特有的接口，效率比Serializable高，推荐用这种方法提高性能。

 *  Parcelable接口的作用：实现了Parcelable接口的实例可以将自身的状态信息写入Parcel，

 *  也可以从Parcel中恢复其状态。 Parcel用来完成数据的序列化传递。

 * */

public class ParcelableUtil implements Parcelable {

private ObjBean objBean;

public ObjBean getObjBean() {
return objBean;
}

public ParcelableUtil(ObjBean objBean) {
super();
this.objBean = objBean;
}

private ParcelableUtil(Parcel in) {
objBean = new ObjBean();
objBean.setId(in.readInt());
objBean.setName(in.readString());
objBean.setPrice(in.readDouble());
objBean.setBitmap((Bitmap) in.readParcelable(Bitmap.class.getClassLoader()));
}

@Override
public int describeContents() {
return 0;
}

/*
* 对象序列化在这里实现，
* 对每一个属性进行封装,写到流中
* 注意：在其他地方读或者设置值的时候，要跟这里写的顺序保持一致，否则读到的值可能为null
* */
@Override
public void writeToParcel(Parcel in, int flags) {
in.writeInt(objBean.getId());
in.writeString(objBean.getName());
in.writeDouble(objBean.getPrice());
in.writeParcelable(objBean.getBitmap(), PARCELABLE_WRITE_RETURN_VALUE);
}

/*
* API解释: Interface that must be implemented and provided as a public CREATOR field 
* that generates instances of your Parcelable class from a Parcel. 
* 
* 实际上用来对象的反序列化
* */
public static final Parcelable.Creator<ParcelableUtil> CREATOR = 
new Parcelable.Creator<ParcelableUtil>() {

@Override
public ParcelableUtil createFromParcel(Parcel source) {
return new ParcelableUtil(source);
}

@Override
public ParcelableUtil[] newArray(int size) {
return new ParcelableUtil[size];
}
};

}

5. MainActivity.java

package com.example.passobjdemo;

import java.io.InputStream;

import android.app.Activity;

import android.content.Intent;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

public class MainActivity extends Activity implements OnClickListener{

private Button sendobj;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

sendobj = (Button) findViewById(R.id.sendobj);
sendobj.setOnClickListener(this);
}

@Override
public void onClick(View v) {
if (v.getId() == R.id.sendobj) {
ObjBean bean = new ObjBean();
bean.setId(1);
bean.setName("Android smart Phone");
bean.setPrice(999.99);

InputStream is = getResources().openRawResource(R.raw.amz);
Bitmap bit = BitmapFactory.decodeStream(is);
bean.setBitmap(bit);

ParcelableUtil pUtil = new ParcelableUtil(bean);

Intent intent = new Intent(MainActivity.this, AnotherActivity.class);
intent.putExtra("objbean", pUtil);//将ParcelableUtil对象put到intent中
startActivity(intent);
}
}

}

6. AnotherActivity.java

package com.example.passobjdemo;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.widget.ImageView;

import android.widget.TextView;

public class AnotherActivity extends Activity {

private ImageView imgView;
private TextView txtView;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.another);
imgView = (ImageView) findViewById(R.id.imgview);
txtView = (TextView) findViewById(R.id.txtview);

Intent intent = getIntent();

                //获取从mainactivity传过来的ParcelableUtil对象
ParcelableUtil pu = (ParcelableUtil) intent.getParcelableExtra("objbean");
ObjBean bean = pu.getObjBean();

                //显示值
imgView.setImageBitmap(bean.getBitmap());
txtView.setText(bean.getName() + "\n" + bean.getPrice());
}

}