Android序列化

来源：互联网发布：c语言编程实例编辑：程序博客网时间：2024/05/19 22:46

其实刚开始目的就是想知道bitmap数组如何传递，结果硬是没弄出来，哎！先把写好的发了，后面再去研究研究。。。

activity_main.xml

<LinearLayout 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"
tools:context="com.example.serializable.MainActivity"
android:orientation="vertical"
>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/hello_world" />
<Button
android:id="@+id/btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="serializable"
/>
<Button
android:id="@+id/btn2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="parcelable"
/>

</LinearLayout>

MainActivity:

public class MainActivity extends Activity implements OnClickListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(this);
Button btn2 = (Button) findViewById(R.id.btn2);
btn2.setOnClickListener(this);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn:
Intent intent = new Intent(MainActivity.this,SerializableActivity.class);
List<String> info = new ArrayList<String>();
info.add("18");
info.add("男");
PersonBean pb = new PersonBean("张三", info);
Bundle mBundle = new Bundle();
mBundle.putSerializable("PersonBean", pb);
intent.putExtras(mBundle);
startActivity(intent);
break;
case R.id.btn2:
Intent intent2 = new Intent(MainActivity.this,ParcelableActivity.class);
List<String> info2 = new ArrayList<String>();
info2.add("18");
info2.add("男");
Bitmap d1 = BitmapFactory.decodeResource(getResources(), R.drawable.a001);
ParcelableBean pab = new ParcelableBean("李四", info2);
Bundle mBundle2 = new Bundle();
mBundle2.putParcelable("ParcelableBean", pab);
ByteArrayOutputStream baos=new ByteArrayOutputStream();
d1.compress(Bitmap.CompressFormat.PNG, 100, baos);
byte [] bitmapByte =baos.toByteArray();
intent2.putExtras(mBundle2);
intent2.putExtra("bitmap",bitmapByte);
startActivity(intent2);
break;
}
}
}

activity_serializable.xml

SerializableActivity:

public class SerializableActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_serializable);
PersonBean pb = (PersonBean) getIntent().getSerializableExtra("PersonBean");
TextView tv1 = (TextView) findViewById(R.id.tv1);
TextView tv2 = (TextView) findViewById(R.id.tv2);
TextView tv3 = (TextView) findViewById(R.id.tv3);
tv1.setText(pb.getName());
tv2.setText(pb.getInfo().get(0));
tv3.setText(pb.getInfo().get(1));
}
}

PersonBean:

public class PersonBean implements Serializable{
private static final long serialVersionUID = 1L;
private String name;
private List<String> info;
public PersonBean() {
}
public PersonBean(String name, List<String> info) {
this.name = name;
this.info = info;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<String> getInfo() {
return info;
}
public void setInfo(List<String> info) {
this.info = info;
}
}

activity_parcelable.xml:

ParcelableActivity:

public class ParcelableActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.i("PDA", "=======2========");
setContentView(R.layout.activity_parcelable);
Log.i("PDA", "=======3========");
//用Intent传bitmap不能大于40KB,否则就会出现这个情况。解决这个问题的简单方案就是全局单例模式：
//我将bitmap放在一个固定的生命周期中的值里，随时可取可消。
ParcelableBean pb = (ParcelableBean) getIntent().getParcelableExtra("ParcelableBean");
Intent intent=getIntent();
byte [] bis=intent.getByteArrayExtra("bitmap");
Bitmap bitmap=BitmapFactory.decodeByteArray(bis, 0, bis.length);
TextView tv1 = (TextView) findViewById(R.id.tv4);
TextView tv2 = (TextView) findViewById(R.id.tv5);
TextView tv3 = (TextView) findViewById(R.id.tv6);
ImageView iv1 = (ImageView) findViewById(R.id.iv1);
tv1.setText(pb.getName());
tv2.setText(pb.getInfo().get(0));
tv3.setText(pb.getInfo().get(1));
iv1.setImageBitmap(bitmap);
}
}

ParcelableBean:

public class ParcelableBean implements Parcelable{
/*实现Parcelable接口需要实现三个方法：
1）writeToParcel方法。该方法将类的数据写入外部提供的Parcel中。声明：writeToParcel(Parcel dest, int flags)。
2）describeContents方法。直接返回0就可以。
3）静态的Parcelable.Creator<T>接口，本接口有两个方法：createFromParcel(Parcel in) 实现从in中创建出类的实例的功能。
newArray(int size) 创建一个类型为T，长度为size的数组， returnnew T[size];即可。本方法是供外部类反序列化本类数组使用。*/
String name;
List<String> info;
public ParcelableBean() {
}
public ParcelableBean(String name, List<String> info) {
this.name = name;
this.info = info;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public List<String> getInfo() {
return info;
}
public void setInfo(List<String> info) {
this.info = info;
}
@Override
public int describeContents() {
return 0;
}
//该方法将类的数据写入外部提供的Parcel中。
@Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(name);
dest.writeList(info);
}
public static final Parcelable.Creator<ParcelableBean> CREATOR = new Creator<ParcelableBean>(){
//实现从source中创建出类的实例的功能
@Override
public ParcelableBean createFromParcel(Parcel source) {
ParcelableBean pb = new ParcelableBean();
pb.name = source.readString();
pb.info = new ArrayList<String>();
source.readList(pb.info,getClass().getClassLoader());
return pb;
}
//创建一个类型为T，长度为size的数组
@Override
public ParcelableBean[] newArray(int size) {
return new ParcelableBean[size];
}
};
}

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