在我的Android应用程序中,我想动态设置通知图标,这些图标将从URL加载。为此,我在setLargeIcon
中使用了NotificationBuilder的receiver
属性。我提到了许多链接并尝试了各种解决方案,但无法获得所需的输出。虽然我从url下载了该图像并在通知中设置了该位图,但它没有显示。相反,它会将setSmallIcon
图像显示为大图标。我不知道我哪里错了。我在这里发布我的代码。请帮我解决这个问题。谢谢。
代码:
@SuppressLint("NewApi")
public class C2DMMessageReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if ("com.google.android.c2dm.intent.RECEIVE".equals(action)) {
Log.e("C2DM", "received message");
final String fullName = intent.getStringExtra("message");
final String payload1 = intent.getStringExtra("message1");
final String payload2 = intent.getStringExtra("message2");
final String userImage = intent.getStringExtra("userImage");
Log.e("userImage Url :", userImage); //it shows correct url
new sendNotification(context)
.execute(fullName, payload1, userImage);
}
}
private class sendNotification extends AsyncTask<String, Void, Bitmap> {
Context ctx;
String message;
public sendNotification(Context context) {
super();
this.ctx = context;
}
@Override
protected Bitmap doInBackground(String... params) {
InputStream in;
message = params[0] + params[1];
try {
in = new URL(params[2]).openStream();
Bitmap bmp = BitmapFactory.decodeStream(in);
return bmp;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
try {
NotificationManager notificationManager = (NotificationManager) ctx
.getSystemService(Context.NOTIFICATION_SERVICE);
Intent intent = new Intent(ctx, NotificationsActivity.class);
intent.putExtra("isFromBadge", false);
Notification notification = new Notification.Builder(ctx)
.setContentTitle(
ctx.getResources().getString(R.string.app_name))
.setContentText(message)
.setSmallIcon(R.drawable.ic_launcher)
.setLargeIcon(result).build();
// hide the notification after its selected
notification.flags |= Notification.FLAG_AUTO_CANCEL;
notificationManager.notify(1, notification);
} catch (Exception e) {
e.printStackTrace();
}
}
}
答案 0 :(得分:35)
更改了我的代码,如下所示:
private class sendNotification extends AsyncTask<String, Void, Bitmap> {
Context ctx;
String message;
public sendNotification(Context context) {
super();
this.ctx = context;
}
@Override
protected Bitmap doInBackground(String... params) {
InputStream in;
message = params[0] + params[1];
try {
URL url = new URL(params[2]);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
in = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(in);
return myBitmap;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
try {
NotificationManager notificationManager = (NotificationManager) ctx
.getSystemService(Context.NOTIFICATION_SERVICE);
Intent intent = new Intent(ctx, NotificationsActivity.class);
intent.putExtra("isFromBadge", false);
Notification notification = new Notification.Builder(ctx)
.setContentTitle(
ctx.getResources().getString(R.string.app_name))
.setContentText(message)
.setSmallIcon(R.drawable.ic_launcher)
.setLargeIcon(result).build();
// hide the notification after its selected
notification.flags |= Notification.FLAG_AUTO_CANCEL;
notificationManager.notify(1, notification);
} catch (Exception e) {
e.printStackTrace();
}
}
}
答案 1 :(得分:31)
如何实施 BigPicture 样式通知:
Miracle已由.setStyle(new Notification.BigPictureStyle().bigPicture(result))
完成:
我这样做了:
通过 AsyncTask生成通知:
new generatePictureStyleNotification(this,"Title", "Message",
"http://api.androidhive.info/images/sample.jpg").execute();
<强>的AsyncTask 强>:
public class generatePictureStyleNotification extends AsyncTask<String, Void, Bitmap> {
private Context mContext;
private String title, message, imageUrl;
public generatePictureStyleNotification(Context context, String title, String message, String imageUrl) {
super();
this.mContext = context;
this.title = title;
this.message = message;
this.imageUrl = imageUrl;
}
@Override
protected Bitmap doInBackground(String... params) {
InputStream in;
try {
URL url = new URL(this.imageUrl);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoInput(true);
connection.connect();
in = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(in);
return myBitmap;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
@Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
Intent intent = new Intent(mContext, MyOpenableActivity.class);
intent.putExtra("key", "value");
PendingIntent pendingIntent = PendingIntent.getActivity(mContext, 100, intent, PendingIntent.FLAG_ONE_SHOT);
NotificationManager notificationManager = (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
Notification notif = new Notification.Builder(mContext)
.setContentIntent(pendingIntent)
.setContentTitle(title)
.setContentText(message)
.setSmallIcon(R.mipmap.ic_launcher)
.setLargeIcon(result)
.setStyle(new Notification.BigPictureStyle().bigPicture(result))
.build();
notif.flags |= Notification.FLAG_AUTO_CANCEL;
notificationManager.notify(1, notif);
}
}
答案 2 :(得分:6)
您可以使用Glide这样操作:
val notificationBuilder = NotificationCompat.Builder(this, channelId)
.setSmallIcon(R.drawable.ic_message)
.setContentTitle("title")
.setContentText("text")
val notificationManager = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
val futureTarget = Glide.with(this)
.asBitmap()
.load(photoUrl)
.submit()
val bitmap = futureTarget.get()
notificationBuilder.setLargeIcon(bitmap)
Glide.with(this).clear(futureTarget)
notificationManager.notify(0, notificationBuilder.build())
答案 3 :(得分:2)
由于图像是从Internet加载的,因此应在后台线程中异步进行。使用异步任务或Glide(以实现有效的图像加载)。
要加载图像通知,您需要使用“ NotificationCompat.BigPictureStyle()”。这需要位图(必须从图片网址中提取)
Glide 的大多数API和方法现已弃用。 以下是适用于Glide 4.9和Android 10的版本。
// Load bitmap from image url on background thread and display image notification
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: pass this bitmap
displayImageNotification(bitmap[0]);
}
@Override
public void onLoadCleared(@Nullable Drawable placeholder) {
}
});
}
显示图像通知一次,位图就准备好了。
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());
}
答案 4 :(得分:0)
我知道已经给出了很好的答案,所以让我们看看是否可以使它更易于理解和实施。
---------------------理论------------------------
该问题可以通过两步解决方案来抽象,即
1)从URL获取图像
2)解码图像并传递给通知生成器
1)从URL获取图像
InputStream in = new URL("Img URL goes here eg. http://gg.com/profile.jpg").openStream();
2)解码并传递给通知
Bitmap bmp = null;
#创建一个空的bmp容器,该容器将用于保存已解码的img
bmp = BitmapFactory.decodeStream(in);
#将图片保存到容器中
Voila!
一旦生成图像并将其保存在变量bmp中,就可以在通知生成器上调用它
.setLargeIcon(bmp)
--------实施---------------
Android Studio会鼓励您使用try catch来包装代码,以便最终产品看起来像这样。
Bitmap bmp = null;
try {
InputStream in = new URL("url goes here").openStream();
bmp = BitmapFactory.decodeStream(in);
} catch (IOException e) {
e.printStackTrace();
}
一旦有了bmp,您就可以在通知生成器中将其称为
NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(this, CHANNEL_ID)
.setSmallIcon(R.drawable.ic_launcher)
.setContentText("title")
.setContentText("text goes here")
.setLargeIcon(bmp)
.setAutoCancel(true);
答案 5 :(得分:0)
使用Picasso库。
Target target = new Target() {
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
largeIcon=bitmap;
}
@Override
public void onBitmapFailed(Drawable errorDrawable) {
}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
}
};
Picasso.with(this).load("url").into(target);
NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(this, channelId)
.setSmallIcon(R.drawable.icon)
.setContentTitle(msg.getString("title"))
.setContentText(msg.getString("msg"))
.setAutoCancel(true)
.setSound(defaultSoundUri)
.setLargeIcon(largeIcon)
.setContentIntent(pendingIntent);
答案 6 :(得分:0)
在Kotlin和协程中的最佳答案。此方法将位图应用到builder
而不是直接分配,当然,如果位图可用,也可以使用。很好,因为如果url错误,它将被try / catch捕获。
fun applyImageUrl(
builder: NotificationCompat.Builder,
imageUrl: String
) = runBlocking {
val url = URL(imageUrl)
withContext(Dispatchers.IO) {
try {
val input = url.openStream()
BitmapFactory.decodeStream(input)
} catch (e: IOException) {
null
}
}?.let { bitmap ->
builder.setLargeIcon(bitmap)
}
}
答案 7 :(得分:0)
由于找不到适用于毕加索的解决方案,因此我在下面使用毕加索发布了完整且有效的示例(2020年7月)。
它将立即发送通知,然后在加载setLargeIcon()的图像时对其进行更新。通常,这非常快,并且在大多数情况下,用户应该只看到通知的更新版本。
private void sendNotification(String message, String title, final String photoUrl) {
Intent intent = new Intent(this, MainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent,
PendingIntent.FLAG_ONE_SHOT);
final NotificationCompat.Builder notificationBuilder =
new NotificationCompat.Builder(this, CHANNEL_ID)
.setSmallIcon(R.drawable.wbib_transp_512)
.setContentTitle(title)
.setContentText(message)
.setAutoCancel(true)
.setPriority(NotificationCompat.PRIORITY_HIGH)
.setCategory(NotificationCompat.CATEGORY_MESSAGE)
.setContentIntent(pendingIntent);
final NotificationManager notificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(0, notificationBuilder.build());
final Handler uiHandler = new Handler(Looper.getMainLooper());
uiHandler.post(new Runnable() {
@Override
public void run() {
Picasso.get()
.load(photoUrl)
.resize(200, 200)
.into(new Target() {
@Override
public void onBitmapLoaded(final Bitmap bitmap, final Picasso.LoadedFrom from) {
notificationBuilder.setLargeIcon(bitmap);
notificationManager.notify(0, notificationBuilder.build());
}
@Override
public void onBitmapFailed(Exception e, final Drawable errorDrawable) {
// Do nothing?
}
@Override
public void onPrepareLoad(final Drawable placeHolderDrawable) {
// Do nothing?
}
});
}
});
}
答案 8 :(得分:0)
RxJava 和 Picasso 方式
private fun bigImageNotification(ctx: Context, title: String, msg: String, imgUrl: String): Disposable? {
return Observable.fromCallable {
Picasso.get().load(imgUrl).get()
}
.subscribeOn(Schedulers.io())
.observeOn(AndroidSchedulers.mainThread())
.subscribe({
createNotification(ctx, title, msg, it)
}, {it.printStackTrace()})
}
private fun createNotification(ctx: Context, title: String, msg: String, img: Bitmap?) {
val b = Notification.Builder(ctx)
b.setAutoCancel(true)
.setSmallIcon(R.mipmap.ic_launcher)
.setContentTitle(title)
.setContentText(msg)
.setStyle(Notification.BigPictureStyle().bigPicture(img))
val notificationManager = ctx.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
notificationManager.notify(1000, b.build())
}
用法
bigImageNotification(context, "title", "msg", "https://www.google.com/images/branding/googlelogo/1x/googlelogo_color_272x92dp.png")