Android利用Parcelable在Activity其间传递自定义对象

Android利用Parcelable在Activity之间传递自定义对象

MainActivity如下:

package cc.testparcelable;

import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
import android.content.Intent;
/**
 * Demo描述:
 * 利用Parcelable在Activity之间传递自定义对象
 */
public class MainActivity extends Activity {
    private Button mButton;
    private final String key="testparcelable";
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		init();
	}
	
	private void init(){
		mButton=(Button) findViewById(R.id.button);
		mButton.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View view) {
				Worker worker=new Worker(9527, "zxx");
				Bundle bundle=new Bundle();
				bundle.putParcelable(key, worker);
				Intent intent=new Intent(MainActivity.this, AnotherActivity.class);
				intent.putExtras(bundle);
				startActivity(intent);
			}
		});
		
	}
}

AnotherActivity如下:

package cc.testparcelable;

import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import android.os.Parcelable;

public class AnotherActivity extends Activity {
	private TextView mTextView;
	 private final String key="testparcelable";
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.another);
		init();
	}

	private void init() {
		mTextView=(TextView) findViewById(R.id.textView);
		Parcelable parcelable=this.getIntent().getParcelableExtra(key);
		Worker worker=(Worker) parcelable;
		mTextView.setText("Parcelable传递过来的数据为:\n"+"id="+worker.getId()+"    name="+worker.getName());
	}

}

Worker如下:

package cc.testparcelable;

import android.os.Parcel;
import android.os.Parcelable;
/**
 * 要传递自定义类型,应让自定义类型支持parcelable协议,
 * 
 * 实现步骤如下：
 * 1>自定义类型必须实现Parcelable接口,并且实现Parcelable接口的public void writeToParcel(Parcel dest, int flags)方法 .
 * 2>自定义类型中必须含有一个名称为CREATOR的静态成员,该成员对象要求实现Parcelable.Creator接口及其方法.
 * 
 * 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(状态信息通常指的是各成员变量的值)写入Parcel
 * 也可以从Parcel中恢复其状态. 所以使用Parcel用来完成数据的序列化传递.
 */

public class Worker implements Parcelable {
	private Integer id;
	private String name;
	

	public Worker() {
		super();
	}
	

	public Worker(Integer id, String name) {
		super();
		this.id = id;
		this.name = name;
	}


	public Integer getId() {
		return id;
	}


	public void setId(Integer id) {
		this.id = id;
	}


	public String getName() {
		return name;
	}


	public void setName(String name) {
		this.name = name;
	}


	@Override
	public String toString() {
		return "Worker [id=" + id + ", name=" + name + "]";
	}

	
   /////////////////////////////////////////////////////////////
	
	//对象在Parcelable中的编码形式 
	@Override
	public int describeContents() {
		return 0;
	}

	//把javaBean中的数据写到Parcel  
	@Override
	public void writeToParcel(Parcel parcel, int flags) {
          parcel.writeInt(this.id);
          parcel.writeString(this.name);
	}
	
	//添加一个静态成员,名为CREATOR,该对象实现了Parcelable.Creator接口
	public static final Parcelable.Creator<Worker> CREATOR = new Parcelable.Creator<Worker>(){
		
		//从Parcel中读取数据,返回worker对象
		@Override
		public Worker createFromParcel(Parcel source) {
			return new Worker(source.readInt(), source.readString());
		}
		@Override
		public Worker[] newArray(int size) {
			return new Worker[size];
		}
	};

}

main.xml如下:

<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"
   >

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Test Parcelable" 
        android:layout_centerInParent="true"
    />

</RelativeLayout>

another.xml如下:

<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"
   >

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
    />

</RelativeLayout>

Android利用Parcelable在Activity其间传递自定义对象

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