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";@Overrideprotected 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() {@Overridepublic 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";@Overrideprotected 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;}@Overridepublic String toString() {return "Worker [id=" + id + ", name=" + name + "]";} ///////////////////////////////////////////////////////////////对象在Parcelable中的编码形式 @Overridepublic int describeContents() {return 0;}//把javaBean中的数据写到Parcel @Overridepublic 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@Overridepublic Worker createFromParcel(Parcel source) {return new Worker(source.readInt(), source.readString());}@Overridepublic 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>