Android之使用Bundle进行IPC

一、Bundle进行IPC介绍

四大组件中的三大组件（Activity、Service、Receiver）都是支持在Intent中传递Bundle数据的，由于Bundle实现了Parcelable接口，所以它可以方便地在不同的进程之间传输。当然，传输的数据必须能够被序列化，比如基本类型、实现了Parcelable接口的对象、实现了Serializable接口的对象以及一些Android支持的特殊对象，具体内容可以看Bundle这个类，就可以看到所有它支持的类型。Bundle不支持的类型无法通过它在进程间传递数据。

二、使用方法

1.打包数据发送

Intent intent1 = new Intent(MainActivity.this, ThirdActivity.class);
Bundle bundle = new Bundle();
bundle.putCharSequence("name", "zhangmiao");
bundle.putInt("age", 20);
intent1.putExtras(bundle);
startActivity(intent1);

2.接受数据

Intent intent = getIntent();
Bundle bundle = intent.getExtras();
String name = bundle.getString("name");
int age = bundle.getInt("age");

3.在AndroidManifest.xml中开启多进程

<activity
   ...
   android:process=":remote" />

三、小案例

1.修改activity_main.xml文件

<?xml version="1.0" encoding="utf-8"?>
<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"
    android:fitsSystemWindows="true"
    tools:context="com.zhangmiao.ipcdemo.MainActivity"
    android:orientation="vertical"
    >
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="Bundler">
    </TextView>

    <Button
        android:id="@+id/bundler_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="send message">
    </Button>

</LinearLayout>

2.添加activity_third.xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="at activity Third" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Activity Third" />

</LinearLayout>

3.添加ThirdActivity类

package com.zhangmiao.ipcdemo;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

/**
 * Created by zhangmiao on 2016/12/27.
 */
public class ThirdActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_third);
        Intent intent = getIntent();
        Bundle bundle = intent.getExtras();
        String name = bundle.getString("name");
        int age = bundle.getInt("age");
        TextView textView = (TextView) findViewById(R.id.textView1);
        textView.setText("name:" + name + ",age:" + age);
    }
}

4.修改MainActivity类

package com.zhangmiao.ipcdemo;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";

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

        Button button = (Button) findViewById(R.id.bundler_button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent1 = new Intent(MainActivity.this, ThirdActivity.class);
                Bundle bundle = new Bundle();
                bundle.putCharSequence("name", "zhangmiao");
                bundle.putInt("age", 20);
                intent1.putExtras(bundle);
                startActivity(intent1);
            }
        });
    }
}

5.修改AndroidManifest.xml文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.zhangmiao.ipcdemo">

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:launchMode="standard"
            android:theme="@style/AppTheme.NoActionBar">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <activity
            android:name=".ThirdActivity"
            android:configChanges="screenLayout"
            android:label="@string/app_name"
            android:process=":remote" />
    </application>
</manifest>

完整代码下载地址：https://github.com/ZhangMiao147/IPCDemo