我知道您可以在消息、标题、图像 URL 等推送通知参数中发送信息。Facebook 如何在通知区域中显示您的个人资料图片和您的消息？我想在通知区域中使用外部图像，因此当您将其拉下时，您会看到带有消息的个人资料图像。现在，我的只是显示可绘制文件夹中的默认图标。我认为这可能是一个常见问题，但找不到任何东西。你能帮忙的话，我会很高兴。
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5 回答
36
该语句将使用一种方法将 URL（自然地，指向图像的 URL）转换为Bitmap.
Bitmap bitmap = getBitmapFromURL("https://graph.facebook.com/YOUR_USER_ID/picture?type=large");
注意：由于您提到了 Facebook 个人资料，因此我提供了一个 URL，该 URL 可以获取您的 Facebook 用户的大尺寸个人资料图片。但是，您可以将其更改为指向您需要在Notification.
以及从您在上述语句中指定的 URL 获取图像的方法：
public Bitmap getBitmapFromURL(String strURL) {
try {
URL url = new URL(strURL);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(input);
return myBitmap;
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
现在将bitmap上面创建的实例传递给Notification.Builder实例。我builder在这个示例代码中调用它。它用于此行：builder.setLargeIcon(bitmap);. 我假设您知道如何显示实际Notification及其配置。因此，我将跳过该部分并仅添加builder。
// CONSTRUCT THE NOTIFICATION DETAILS
builder.setAutoCancel(true);
builder.setSmallIcon(R.drawable.ic_launcher);
builder.setContentTitle("Some Title");
builder.setContentText("Some Content Text");
builder.setLargeIcon(bitmap);
builder.setContentIntent(pendingIntent);
哦，差点忘了，如果你还没有这样做，你需要在 Manifest 中设置这个权限：
<uses-permission android:name="android.permission.INTERNET" />
于 2013-04-15T04:30:15.983 回答
18
首先使用以下代码下载图像：
private Bitmap getBitmap(String url)
{
File f=fileCache.getFile(url);
//from SD cache
Bitmap b = decodeFile(f);
if(b!=null)
return b;
//from web
try {
Bitmap bitmap=null;
URL imageUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection)imageUrl.openConnection();
conn.setConnectTimeout(30000);
conn.setReadTimeout(30000);
conn.setInstanceFollowRedirects(true);
InputStream is=conn.getInputStream();
OutputStream os = new FileOutputStream(f);
Utils.CopyStream(is, os);
os.close();
bitmap = decodeFile(f);
return bitmap;
} catch (Exception ex){
ex.printStackTrace();
return null;
}
}
//decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f){
try {
//decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(f),null,o);
//Find the correct scale value. It should be the power of 2.
final int REQUIRED_SIZE=70;
int width_tmp=o.outWidth, height_tmp=o.outHeight;
int scale=1;
while(true){
if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
break;
width_tmp/=2;
height_tmp/=2;
scale*=2;
}
//decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize=scale;
return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
} catch (FileNotFoundException e) {}
return null;
}
在下面的代码中使用该图像作为位图：
Bitmap icon1 = downloadedBitmap;
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(
this).setAutoCancel(true)
.setContentTitle("DJ-Android notification")
.setSmallIcon(R.drawable.ic_launcher)
.setContentText("Hello World!");
NotificationCompat.BigPictureStyle bigPicStyle = new NotificationCompat.BigPictureStyle();
bigPicStyle.bigPicture(icon1);
bigPicStyle.setBigContentTitle("Dhaval Sodha Parmar");
mBuilder.setStyle(bigPicStyle);
// Creates an explicit intent for an Activity in your app
Intent resultIntent = new Intent(this, testActivity.class);
// The stack builder object will contain an artificial back stack
// for
// the
// started Activity.
// This ensures that navigating backward from the Activity leads out
// of
// your application to the Home screen.
TaskStackBuilder stackBuilder = TaskStackBuilder.create(this);
// Adds the back stack for the Intent (but not the Intent itself)
stackBuilder.addParentStack(testActivity.class);
// Adds the Intent that starts the Activity to the top of the stack
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent = stackBuilder.getPendingIntent(
0, PendingIntent.FLAG_UPDATE_CURRENT);
mBuilder.setContentIntent(resultPendingIntent);
NotificationManager mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// mId allows you to update the notification later on.
mNotificationManager.notify(100, mBuilder.build());
我知道你不知道关于 android 权限：
<uses-permission android:name="android.permission.INTERNET" />
有关更多详细信息，请查看此artical和android 开发人员
于 2013-04-15T05:38:39.627 回答
0
我使用通用图像加载器来解决这个问题。查看 wiki 以了解如何设置它。实例化一次后，这是我在 GCM 侦听器中用于下载和显示图像的代码。我下载位图，然后在通知中设置它：
// Download profile picture of the user with Universal Image Loader
Bitmap bitmap = ImageLoader.getInstance().loadImageSync(profilePhotoUrl);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent,
PendingIntent.FLAG_ONE_SHOT);
Uri defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
.setSmallIcon(R.drawable.ic_my_app)
.setLargeIcon(bitmap) // This is the image displayed on the lock screen
.setContentTitle("My App")
.setContentText(message)
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setContentIntent(pendingIntent);
于 2016-03-11T01:40:31.717 回答
0
由于图像是从互联网加载的，它应该在后台线程中异步完成。您可以使用 (1) 异步任务或 (2) Glide（用于有效的图像加载）。
要加载图像通知，您需要使用“ NotificationCompat.BigPictureStyle() ”。这需要一个位图（必须从图像 url 中提取）
Glide的大部分 API 和方法现在都被弃用了。以下适用于 Glide 4.9 和 Android 10。
第 1 步：从后台线程上的图像 url 加载位图
private void getBitmapAsyncAndDoWork(String imageUrl) {
final Bitmap[] bitmap = {null};
Glide.with(getApplicationContext())
.asBitmap()
.load(imageUrl)
.into(new CustomTarget<Bitmap>() {
@Override
public void onResourceReady(@NonNull Bitmap resource, @Nullable Transition<? super Bitmap> transition) {
bitmap[0] = resource;
// TODO Do some work: Load image notification from here
displayImageNotification(bitmap[0]);
}
@Override
public void onLoadCleared(@Nullable Drawable placeholder) {
}
});
}
步骤2：显示一次图像通知，位图准备就绪。
private void displayImageNotification(Bitmap bitmap) {
NotificationCompat.Builder builder = new NotificationCompat.Builder(getApplicationContext(), getChannelId());
builder
.setContentTitle(title)
.setContentText(subtext)
.setDefaults(Notification.DEFAULT_LIGHTS | Notification.DEFAULT_VIBRATE)
.setSmallIcon(SMALL_ICON)
.setPriority(NotificationCompat.PRIORITY_DEFAULT)
.setColor(getApplicationContext().getColor(color))
.setAutoCancel(true)
.setOngoing(false)
.setOnlyAlertOnce(true)
.setContentIntent(pendingIntent)
.setStyle(
new NotificationCompat.BigPictureStyle().bigPicture(bitmap))
.setPriority(Notification.PRIORITY_HIGH);
getManager().notify(tag, id, builder.build());
}
于 2019-11-08T06:57:15.370 回答
-3
Notification notif = new Notification.Builder(context)
.setContentTitle("Title")
.setContentText("content")
.setSmallIcon(R.drawable.ic_small)
.setLargeIcon(bitmap)
.setStyle(new Notification.BigPictureStyle()
.bigPicture(bigBitmap)
.setBigContentTitle("big title"))
.build();
于 2015-02-03T08:48:52.177 回答