Android入门篇四：使用剪切板在Activity之间传递对象数据

使用剪切板在Activity之间传递对象数据，要用到一个特殊的类---android.util.Base64.java，将对象转换成字符串，再在剪切板中放入要传递的数据，在接收端将字符串还原成对象，在把数据取出来，通过例子来看一下如何实现：

工程结构图：

运行结果如下：

MainActivity截图：

OtherActivity截图：

开始上源代码：

MainActivity.java:

package com.intent.activity;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.ObjectOutputStream;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.content.pm.ActivityInfo;import android.os.Bundle;import android.text.ClipboardManager;import android.util.Base64;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity {private Button btn;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        btn = (Button)findViewById(R.id.btOpenOtherActivity);        btn.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {Person person = new Person("wulianghuan","22");//将对象转换成字符串ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();String base64String = "";try {ObjectOutputStream objectOutputStream = new ObjectOutputStream(byteArrayOutputStream);objectOutputStream.writeObject(person);base64String = Base64.encodeToString(byteArrayOutputStream.toByteArray(), Base64.DEFAULT);objectOutputStream.close();} catch (IOException e) {e.printStackTrace();}//从Android系统中调用剪切板的服务ClipboardManager clipboardManager = (ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE);//在剪切板中放入要传递的数据clipboardManager.setText(base64String);//定义一个意图Intent intent = new Intent(MainActivity.this,OtherActivity.class);startActivity(intent);}});    }}

OtherActivity.java:

package com.intent.activity;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.ObjectInputStream;import java.io.StreamCorruptedException;import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.text.ClipboardManager;import android.util.Base64;import android.util.Log;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class OtherActivity extends Activity {private TextView text_name;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.other);text_name = (TextView) findViewById(R.id.name);//从Android系统中调用剪切板的服务ClipboardManager clipboardManager = (ClipboardManager)getSystemService(Context.CLIPBOARD_SERVICE);String getString = clipboardManager.getText().toString();//字符串还原成对象byte[] base64_byte = Base64.decode(getString, Base64.DEFAULT);ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(base64_byte);try {ObjectInputStream objectInputStream = new ObjectInputStream(byteArrayInputStream);Person person = (Person)objectInputStream.readObject();Log.i("OtherActivity", person.toString());//设置文本框的数据text_name.setText(person.toString());} catch (StreamCorruptedException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} catch (ClassNotFoundException e) {e.printStackTrace();}}}

由于main.xml文件比较简单，这里就不给出源代码了

注意在AndroidManifest.xml中对OtherActivity进行声明。

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