Android通过RemoteViews实现跨进程更新UI示例

概述一、概述前面一篇文章Android通过AIDL实现跨进程更新UI我们学习了aidl跨进程更新ui，这种传统方式实现跨进程更新UI是可行的，但有以下弊端：

一、概述

前面一篇文章AndroID通过AIDL实现跨进程更新UI我们学习了aIDl跨进程更新ui，这种传统方式实现跨进程更新UI是可行的，但有以下弊端：

VIEw中的方法数比较多，在IPC中需要增加对应的方法比较繁琐。 VIEw的每一个方法都会涉及到IPC *** 作，多次IPC带来的开销问题不容小觑。 VIEw中方法的某些参数可能不支持IPC传输。例如：OnClickListener，它仅仅是个接口没有序列化。

接下来我们通过RemoteVIEws实现跨进程更新UI

二、实现效果图

在同一个应用中有两个Activity，MainActivity和Temp2Activity，这两个Activity不在同一个进程中。

现在需要通过Temp2Activity来改变MainActivity中的视图，即在MainActivity中添加两个button，也就是实现跨进程更新UI这么一个功能。

在MainActivity里点击“跳转到新进程ACTIVITY”按钮，会启动一个新进程的Temp2Activity，我们先点击“绑定服务”，这样我们就启动了服务，再点击“AIDL更新”按钮，通过调用handler来实现跨进程更新UI，点击返回，我们发现MainActivity页面中新添加了两个按钮，并且按钮还具有点击事件。

三、核心代码

IremoteVIEwsManager.aIDl

里面提供了两个方法，一个是根据ID更新TextVIEw里面的内容，一个是根据ID添加vIEw视图

// IremoteVIEwsManager.aIDl.aIDlpackage com.czhappy.remotevIEwdemo;interface IremoteVIEwsManager {  voID addRemoteVIEw(in RemoteVIEws remoteVIEws);}

RemoteVIEwsAIDLService.Java

package com.czhappy.remotevIEwdemo.service;import androID.app.Service;import androID.content.Intent;import androID.os.Binder;import androID.os.Bundle;import androID.os.IBinder;import androID.os.Message;import androID.os.remoteexception;import androID.Widget.RemoteVIEws;import com.czhappy.remotevIEwdemo.IremoteVIEwsManager;import com.czhappy.remotevIEwdemo.activity.MainActivity;/** * Description: * User: chenzheng * Date: 2017/2/10 0010 * Time: 10:56 */public class RemoteVIEwsAIDLService extends Service {  private static final String TAG = "RemoteVIEwsAIDLService";  private Binder remoteVIEwsBinder = new IremoteVIEwsManager.Stub(){    @OverrIDe    public voID addRemoteVIEw(RemoteVIEws remoteVIEws) throws remoteexception {      Message message = new Message();      message.what = 1;      Bundle bundle = new Bundle();      bundle.putParcelable("remoteVIEws",remoteVIEws);      message.setData(bundle);      new MainActivity.MyHandler(RemoteVIEwsAIDLService.this,getMainLooper()).sendMessage(message);    }  };  public RemoteVIEwsAIDLService() {  }  @OverrIDe  public IBinder onBind(Intent intent) {    return remoteVIEwsBinder;  }}

MainActivity.java

package com.czhappy.remotevIEwdemo.activity;import androID.content.Context;import androID.content.Intent;import androID.os.Bundle;import androID.os.Handler;import androID.os.Looper;import androID.os.Message;import androID.support.v7.app.AppCompatActivity;import androID.util.Log;import androID.vIEw.LayoutInflater;import androID.vIEw.VIEw;import androID.Widget.linearLayout;import androID.Widget.RemoteVIEws;import androID.Widget.TextVIEw;import com.czhappy.remotevIEwdemo.R;import java.lang.ref.WeakReference;public class MainActivity extends AppCompatActivity {  private static String TAG = "MainActivity";  private static linearLayout mlinearLayout;  @OverrIDe  protected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    mlinearLayout = (linearLayout) this.findVIEwByID(R.ID.mylayout);  }  public static class MyHandler extends Handler {    WeakReference<Context> weakReference;    public MyHandler(Context context,Looper looper) {      super(looper);      weakReference = new WeakReference<>(context);    }    @OverrIDe    public voID handleMessage(Message msg) {      super.handleMessage(msg);      Log.i(TAG,"handleMessage");      switch (msg.what) {        case 1: //RemoteVIEws的AIDL实现          RemoteVIEws remoteVIEws = msg.getData().getParcelable("remoteVIEws");          if (remoteVIEws != null) {            Log.i(TAG,"updateUI");            VIEw vIEw = remoteVIEws.apply(weakReference.get(),mlinearLayout);            mlinearLayout.addVIEw(vIEw);          }          break;        default:          break;      }    }  };  public voID readyGo(VIEw vIEw){    Intent intent = new Intent(MainActivity.this,Temp2Activity.class);    startActivity(intent);  }}

Temp2Activity.java

package com.czhappy.remotevIEwdemo.activity;import androID.app.PendingIntent;import androID.content.Componentname;import androID.content.Context;import androID.content.Intent;import androID.content.ServiceConnection;import androID.os.Bundle;import androID.os.IBinder;import androID.os.remoteexception;import androID.support.annotation.Nullable;import androID.support.v7.app.AppCompatActivity;import androID.util.Log;import androID.vIEw.VIEw;import androID.Widget.RemoteVIEws;import com.czhappy.remotevIEwdemo.IremoteVIEwsManager;import com.czhappy.remotevIEwdemo.R;import com.czhappy.remotevIEwdemo.service.RemoteVIEwsAIDLService;/** * Description: * User: chenzheng * Date: 2017/2/9 0009 * Time: 16:05 */public class Temp2Activity extends AppCompatActivity {  private String TAG = "Temp2Activity";  private IremoteVIEwsManager remoteVIEwsManager;  private boolean isBind = false;  private ServiceConnection remoteVIEwServiceConnection = new ServiceConnection() {    @OverrIDe    public voID onServiceConnected(Componentname name,IBinder service) {      Log.i(TAG,"onServiceConnected");      remoteVIEwsManager = IremoteVIEwsManager.Stub.asInterface(service);    }    @OverrIDe    public voID onServicedisconnected(Componentname name) {      //回收      remoteVIEwsManager = null;    }  };  @OverrIDe  protected voID onCreate(@Nullable Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    this.setContentVIEw(R.layout.activity_temp);  }  /**   * 绑定服务   */  public voID bindService(VIEw vIEw) {    Intent vIEwServiceIntent = new Intent(this,RemoteVIEwsAIDLService.class);    isBind = bindService(vIEwServiceIntent,remoteVIEwServiceConnection,Context.BIND_auto_CREATE);  }  /**   * 更新UI   */  public voID UpdateUI(VIEw vIEw){    RemoteVIEws remoteVIEws = new RemoteVIEws(Temp2Activity.this.getPackagename(),R.layout.button_layout);    Intent intentClick = new Intent(Temp2Activity.this,FirstActivity.class);    PendingIntent openFirstActivity = PendingIntent.getActivity(Temp2Activity.this,intentClick,0);    remoteVIEws.setonClickPendingIntent(R.ID.firstbutton,openFirstActivity);    Intent secondClick = new Intent(Temp2Activity.this,SecondActivity.class);    PendingIntent openSecondActivity = PendingIntent.getActivity(Temp2Activity.this,secondClick,0);    remoteVIEws.setonClickPendingIntent(R.ID.secondbutton,openSecondActivity);    remoteVIEws.setCharSequence(R.ID.secondbutton,"setText","想改就改");    try {      remoteVIEwsManager.addRemoteVIEw(remoteVIEws);    } catch (remoteexception e) {      e.printstacktrace();    }  }  @OverrIDe  protected voID onDestroy() {    super.onDestroy();    if(isBind){      unbindService(remoteVIEwServiceConnection);      isBind = false;    }  }}

AndroIDManifest.xml

<?xml version="1.0" enCoding="utf-8"?><manifest xmlns:androID="http://schemas.androID.com/apk/res/androID"  package="com.czhappy.remotevIEwdemo">  <application    androID:allowBackup="true"    androID:icon="@mipmap/ic_launcher"    androID:label="@string/app_name"    androID:supportsRtl="true"    androID:theme="@style/Apptheme">    <activity androID:name=".activity.MainActivity">      <intent-filter>        <action androID:name="androID.intent.action.MAIN" />        <category androID:name="androID.intent.category.LAUNCHER" />      </intent-filter>    </activity>    <activity androID:name=".activity.FirstActivity" />    <activity androID:name=".activity.SecondActivity" />    <activity      androID:name=".activity.Temp2Activity"      androID:process=":remote2" />    <service androID:name="com.czhappy.remotevIEwdemo.service.RemoteVIEwsAIDLService" />  </application></manifest>

四、总结

RemoteVIEws就是为跨进程更新UI而生的，内部封装了很多方法用来实现跨进程更新UI。但这并不代表RemoteVIEws是就是万能的了，它也有不足之处，目前支持的布局和VIEw有限

layout：

FrameLayout linearLayout relativeLayout GrIDLayout

VIEw：

AnalogClock button Chronometer Imagebutton ImageVIEw Progressbar TextVIEw VIEwFlipper ListVIEw GrIDVIEw StackVIEw AdapterVIEwFlipper VIEwStub

不支持自定义view 所以具体使用RemoteVIEws还是aIDl或者broadCastReceiver还得看实际的需求。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程小技巧。

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