RemoteViews使用，内部原理史上最全 (一)

 

RemoteViews是什么？

翻译过来，顾名思义就是远程的View，先看下官方文档的说明

/**
 * A class that describes a view hierarchy that can be displayed in
 * another process. The hierarchy is inflated from a layout resource
 * file, and this class provides some basic operations for modifying
 * the content of the inflated hierarchy.
   public class RemoteViews implements Parcelable, Filter {

意思是这个类是一个描述视图结构的类、以及提供了一些基本的修改操作，注意这个RemoteViews并没有继承于View，不是一个View，只是提供方法，并且继承了Parcelable，为实现跨进程提供了条件。

RemoteViews常用的就是自定义通知栏界面、桌面小控件、当然也可以更新两个不同应用的界面、或者用于闹钟功能（闹钟功能这里不讲）这些接下来会讲到。

 

一、RemoteViews和Notification

public final String CHANNEL_ID_SERVICE_HANDLE = "com.xsx.Channel_id";
 
 private void setNotification() {
        //判断版本
        setChannel();
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID_SERVICE_HANDLE);
        builder.setSmallIcon(R.mipmap.ic_launcher_round);
        builder.setContentTitle("我去也");
        builder.setContentText("我來也");
        builder.setSound(null);
        //点击消失
        //builder.setAutoCancel(true);
        //默认高度256 超出则显示不全
        //builder.setCustomBigContentView(remoteViews);
        Notification notification = builder.build();
        NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        Intent intent = new Intent();
        PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 1, intent, PendingIntent.FLAG_UPDATE_CURRENT);
        notification.contentIntent = pendingIntent;
        // if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
            // 高度256 超出则显示不全 可以更大的显示通知栏高度
            // 通知栏默认高度是64
            // notification.bigContentView = remoteViews;
        // }
        manager.notify(1, notification);
    }
    
   private void setChannel() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            CharSequence name = "CHANNEL_NAME";
            String description = "CHANNEL_DESCRIPTION";
            int importance = NotificationManager.IMPORTANCE_DEFAULT;
            NotificationChannel channel = new NotificationChannel(CHANNEL_ID_SERVICE_HANDLE, name, importance);
            channel.setDescription(description);
            channel.setSound(null, null);
            NotificationManager notificationManager = getSystemService(NotificationManager.class);
            notificationManager.createNotificationChannel(channel);

        }
    }

效果图如下：

 

1.1、自定义通知栏界面

上面是简单的实现系统通知栏的效果，但是无法自定义通知栏界面，并且无法实现通知栏里特定控件的点击事件，这就可以用到RemoteViews，先初始化RemoteViews，通过setOnClickPendingIntent(注意不是setOnClickListener)来设置点击事件，再写一个广播来监听点击事件，

如下：

private void setNotification() {
        //判断版本
        setChannel();
        //初始化RemoteViews
        RemoteViews remoteViews = new RemoteViews(this.getPackageName(), R.layout.remote_view);
        NotificationCompat.Builder builder = new NotificationCompat.Builder(this, CHANNEL_ID_SERVICE_HANDLE);
        builder.setSmallIcon(R.mipmap.ic_launcher_round);
        builder.setContentTitle("我去也");
        builder.setContentText("我來也");
        builder.setSound(null);
   
        Notification notification = builder.build();
        NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
        //设置头部图片
        remoteViews.setImageViewResource(R.id.head_imageVie, R.drawable.zip1);
        //头部图片点击