我有这个问题,我从我在通知中使用的URL生成位图.然而,在我的手机上,Bitmap显示为一个小白色的方块.我看着它,发现很多帖子像这样说：

Icon not displaying in notification: white square shown instead

我确定我的小图标通知确实是透明的.然而,对于大图标,我意识到大图标不能透明,因为它实际上是一个从URL生成的位图.那么我该如何解决这个问题,并确保图像呈现正确,而不是将大图标显示为白色方块？这是我的尝试：

NotificationService.java：

NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context)

.setContentTitle(getString(R.string.app_name))

.setContentText(remoteMessage.getNotification().getBody())

.setTicker(remoteMessage.getFrom() + " has responded!")

.setLargeIcon(AndroidUtils.getBitmapFromURL(remoteMessage.getNotification().getIcon()))

.setAutoCancel(true)

.setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION))

.setStyle(new NotificationCompat.BigTextStyle().bigText(remoteMessage.getNotification().getBody()))

.setSmallIcon(R.drawable.ic_tabs_notification_transparent);

AndroidUtils.java：

public static Bitmap getBitmapFromURL(String userId) {

try {

URL imgUrl = new URL("https://graph.facebook.com/" + userId + "/picture?type=large");

InputStream in = (InputStream) imgUrl.getContent();

Bitmap bitmap = BitmapFactory.decodeStream(in);

Bitmap output;

Rect srcRect;

if (bitmap.getWidth() > bitmap.getHeight()) {

output = Bitmap.createBitmap(bitmap.getHeight(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);

srcRect = new Rect((bitmap.getWidth()-bitmap.getHeight())/2, 0, bitmap.getWidth()+(bitmap.getWidth()-bitmap.getHeight())/2, bitmap.getHeight());

} else {

output = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getWidth(), Bitmap.Config.ARGB_8888);

srcRect = new Rect(0, (bitmap.getHeight()-bitmap.getWidth())/2, bitmap.getWidth(), bitmap.getHeight()+(bitmap.getHeight()-bitmap.getWidth())/2);

}

Canvas canvas = new Canvas(output);

final int color = 0xff424242;

final Paint paint = new Paint();

final Rect rect = new Rect(0, 0, bitmap.getWidth(), bitmap.getHeight());

float r;

if (bitmap.getWidth() > bitmap.getHeight()) {

r = bitmap.getHeight() / 2;

} else {

r = bitmap.getWidth() / 2;

}

paint.setAntiAlias(true);

canvas.drawARGB(0, 0, 0, 0);

paint.setColor(color);

canvas.drawCircle(r, r, r, paint);

paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));

canvas.drawBitmap(bitmap, srcRect, rect, paint);

return output;

} catch (IOException e) {

FirebaseCrash.report(e);

return null;

}

图像显示我的问题：

编辑：Build.gradle文件显示：

apply plugin: 'com.android.application'

android {

compileSdkVersion 23

buildToolsVersion "23.0.1"

compileOptions {

sourceCompatibility JavaVersion.VERSION_1_7

targetCompatibility JavaVersion.VERSION_1_7

}

defaultConfig {

applicationId ''

multiDexEnabled true

minSdkVersion 21

targetSdkVersion 23

versionCode 12

versionName ".12"

signingConfig signingConfigs.Tabs

}

buildTypes {

release {

minifyEnabled false

shrinkResources false

zipAlignEnabled true

debuggable false

proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'

signingConfig signingConfigs.Tabs

}

debug {

applicationIdSuffix ".debug"

debuggable true

minifyEnabled false

signingConfig signingConfigs.Tabs

}

}

//DatabaseReference stuff

packagingOptions {

exclude 'META-INF/LICENSE'

exclude 'META-INF/LICENSE-FIREBASE.txt'

exclude 'META-INF/NOTICE'

}

dexOptions {

javaMaxHeapSize "4g"

}

productFlavors {

}

}