Question

我在使用Application-Theme更改Background-Color时出现问题。

NotificationCompat.Builder nBuilder = new NotificationCompat.Builder(this);

TypedValue typedValue = new TypedValue();

getTheme().resolveAttribute(R.attr.colorPrimary, typedValue, true);

int iPrimaryColor = typedValue.data;

getTheme().resolveAttribute(R.attr.colorPrimaryDark, typedValue, true);

int iPrimaryDarkColor = typedValue.data;

Intent notIntent = new Intent(getApplicationContext(), MainActivity.class);
notIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);

PendingIntent notOpenOnClick = PendingIntent.getActivity(getApplicationContext(), 0, notIntent, PendingIntent.FLAG_UPDATE_CURRENT);

RemoteViews smallContentView = new RemoteViews(getPackageName(), R.layout.notification_small);
RemoteViews bigContentView = new RemoteViews(getPackageName(), R.layout.notification_expanded);

nBuilder.setSmallIcon(R.drawable.not_icon)
    .setOngoing(true)
    .setContentTitle(getCurrentSong().getTitle())
    .setContentIntent(notOpenOnClick);

Notification not = nBuilder.build();

smallContentView.setInt(R.id.not_linLayout, "setBackgroundColor", iPrimaryColor);
smallContentView.setInt(R.id.not_imvDivider, "setBackgroundColor", iPrimaryDarkColor);

bigContentView.setInt(R.id.not_linLayout, "setBackgroundColor", iPrimaryColor);
bigContentView.setInt(R.id.not_imvDivider, "setBackgroundColor", iPrimaryDarkColor);

setListeners(smallContentView);
setListeners(bigContentView);

not.contentView = smallContentView;
not.bigContentView = bigContentView;

if (isPlaying()) {
    not.contentView.setImageViewResource(R.id.not_btnPlayPause, R.drawable.ic_pause_48dp);
    not.bigContentView.setImageViewResource(R.id.not_btnPlayPause, R.drawable.ic_pause_48dp);
}
else {
    not.contentView.setImageViewResource(R.id.not_btnPlayPause, R.drawable.ic_play_48dp);
    not.bigContentView.setImageViewResource(R.id.not_btnPlayPause, R.drawable.ic_play_48dp);
}

我已经尝试过了，但我的通知背景仍然是白色的。 ID是正确的，View linLayout是一个LinearLayout。

请记住：整个代码在服务中调用！

谢谢！

Answer 1

利用NotificationCompat.MediaStyle可以更轻松地完成大部分工作。它从API 24之前的设备上的setColor()调用中提取背景颜色（并将该颜色用作API 24+设备上的重音）。这也意味着您不再需要编写任何自定义RemoteViews代码，因为它仅依赖于您添加到媒体控件通知中的操作：

NotificationCompat.Builder nBuilder = new NotificationCompat.Builder(this);
nBuilder.setSmallIcon(R.drawable.not_icon)
  .setContentTitle(getCurrentSong().getTitle())
  .setContentIntent(notOpenOnClick);
// This is what sets the background color on <N devices
// It is an accent color on N+ devices
nBuilder.setColor(getResources().getColor(R.color.colorPrimary));
// Add actions via nBuilder.addAction()
// Set the style, setShowActionsInCompactView(0) means the first
// action you've added will be shown the non-expanded view
nBuilder.setStyle(new NotificationCompat.MediaStyle()
  .setShowActionsInCompactView(0));

您绝对应该阅读MediaStyle可用的所有方法，并重新审核Best Practices in media playback I/O 2016 talk示例代码和使用通知的最佳做法。具体在30 minutes into the talk

Answer 2

setColorized文档说：

设置此通知是否应为彩色。设置后，使用 setColor（int）设置的颜色将用作此通知的背景色。

这仅应用于用户的高优先级正在进行的任务，例如导航，正在进行的呼叫或其他类似的高优先级事件。

对于大多数样式，仅当通知是针对前台服务通知时，才会应用着色。

但是，对于附加了媒体会话的 MediaStyle和DecoratedMediaCustomViewStyle通知，则没有此要求。

在O之前的任何版本上调用此方法都不会影响通知，并且不会着色。

科特琳代码：

import android.support.v4.media.session.MediaSessionCompat
import android.support.v4.media.session.PlaybackStateCompat
import androidx.core.app.NotificationCompat
import androidx.media.app.NotificationCompat.DecoratedMediaCustomViewStyle

// create a MediaSession so that we can create a DecoratedMediaCustomViewStyle
val mediaSession = MediaSessionCompat(applicationContext,"tag")
mediaSession.setFlags(0)
mediaSession.setPlaybackState(PlaybackStateCompat.Builder()
        .setState(PlaybackStateCompat.STATE_NONE,0,0f)
        .build())

// create & display the colorized notification
notificationManager.notify(
        0,
        NotificationCompat
                .Builder(this,notificationChannel)
                .setStyle(DecoratedMediaCustomViewStyle()
                        .setMediaSession(mediaSession.sessionToken))
                .setSmallIcon(R.drawable.ic_app_foreground)
                .setColor(getColor(android.R.color.black))
                .setColorized(true)
                .setContentText("Hello, World!")
                .build())

....

// cleanup upon dismissing the notification
mediaSession.release()

更改通知RemoteViews背景颜色

2 个答案: