android notification

专案网址https://github.com/uuko/android_project/tree/master/Notifaction
参考文章 android官方document+codelab
每个通知通道代表一种通知类型。
在您的代码中，您可以在每个通知通道中将多个通知分组。
对于每个通知通道，您的应用程序设置行为的通道，并且行为被应用到该频道的所有通知。例如，您的应用可能会在频道中设置通知以播放声音，闪烁灯光或振动。
无论您的应用为通知渠道设置了什么行为，用户都可以更改该行为，并且用户可以完全关闭您的应用的通知。

//每个channel与唯一id相连  private static final String PRIMARY_CHANNEL_ID ="primary_notification_channel";  @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button notify=(Button) findViewById(R.id.notify);        notify.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                sendNotification();            }        });       ** createNotificationChannel();**    }   public void sendNotification(){                                                  //builder实例        NotificationCompat.Builder notifyBuilder = getNotificationBuilder();        notificationManager.**notify**(NOTIFICATION_ID, notifyBuilder.build());    }  //notificationmanger >传递给用户的 private NotificationManager notificationManager;public void createNotificationChannel() {//实体化manager并设置一些参数     notificationManager=            (NotificationManager)getSystemService(NOTIFICATION_SERVICE);        if (Build.VERSION.SDK_INT>=android.os.Build.VERSION_CODES.O){        /*创建一个channel对象 public NotificationChannel (String id,                 CharSequence name,                 int importance)*/            NotificationChannel notificationChannel=                    new NotificationChannel(PRIMARY_CHANNEL_ID,                            "123" ,NotificationManager.IMPORTANCE_HIGH                            );            notificationChannel.enableLights(true);            notificationChannel.setLightColor(Color.RED);            notificationChannel.enableVibration(true);            notificationChannel.setDescription("hihi"); //正式创建                   notificationManager.createNotificationChannel(notificationChannel);           }}//使用NotificationCompat.Builder该类创建通知//需要一个ID让通知相关 以好取消OR更新private static final int NOTIFICATION_ID = 0;private NotificationCompat.Builder getNotificationBuilder(){        Intent notifyIntent=new Intent(this,MainActivity.class);        //intent必须包在pendingintent里面        PendingIntent notifyPendingIntent=PendingIntent.getActivity(this,                NOTIFICATION_ID,notifyIntent,PendingIntent.FLAG_UPDATE_CURRENT);                //FLAG_UPDATE_CURRENT>第二条会替换第一条内容 CANCEL是会变点第一条没反应只有第二条可以点        NotificationCompat.Builder notifyBuilder=                new NotificationCompat.Builder(this,PRIMARY_CHANNEL_ID)                        .setContentTitle("notify~~~")                        .setContentText("uuko notify!!")                        .setSmallIcon(R.drawable.ic_launcher_background)                        .setContentIntent(notifyPendingIntent)//加入intent                        .setAutoCancel(true);        return notifyBuilder;    }

观念>
通知为您的应用提供了一种与用户进行交互的方式，即使该应用未运行也是如此。
当Android发布通知时，该通知首先显示为设备通知区域中的图标。
(这可以用intent+pendingintent去做 再加broadcast)
要指定通知的UI和操作，请使用NotificationCompat.Builder。
要创建通知，请使用NotificationCompat.Builder.build()。
要发出通知，请使用NotificationManager.notify()将该通知对像传递给Android运行时系统。
为了使更新或取消通知成为可能，请将通知ID与通知相关联。
通知可以包含多个组件，包括一个小图标（setSmallIcon()，必填）；标题（setContentTitle()）; 以及详细的文字（setContentText()）。
通知还可以包括待处理的意图，扩展的样式，优先级等。有关更多详细信息，请参见 NotificationCompat.Builder。

//功能拓展

public class MainActivity extends AppCompatActivity {    private static final String PRIMARY_CHANNEL_ID = "primary_notification_channel";    private NotificationManager notificationManager;    private static final int NOTIFICATION_ID = 0;    private static final String ACTION_UPDATE_NOTIFICATION =            "com.example.android.Notifaction.ACTION_UPDATE_NOTIFICATION";    private NotificationReciever notificationReciever;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        notificationReciever=new NotificationReciever();        Button update=(Button) findViewById(R.id.update);        update.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                updateNotification();            }        });        Button cancel=(Button) findViewById(R.id.cancel);        cancel.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                cancelupdateNotification();            }        });        Button notify=(Button) findViewById(R.id.notify);        notify.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                sendNotification();            }        });        createNotificationChannel();        setbuttonstate(true,false,false);        registerReceiver(notificationReciever,new IntentFilter(ACTION_UPDATE_NOTIFICATION));    }        @Override    public void onDestroy(){        unregisterReceiver(notificationReciever);        super.onDestroy();    }    //更新    public  void updateNotification(){        Bitmap bitmap= BitmapFactory.decodeResource(getResources(),R.drawable.mascot_1);        NotificationCompat.Builder notifybuilder=getNotificationBuilder();        notifybuilder.setStyle(new NotificationCompat.BigPictureStyle()                .bigPicture(bitmap)                .setBigContentTitle("bigggg"));        notificationManager.notify(NOTIFICATION_ID,notifybuilder.build());        setbuttonstate(false,true,true);    }    //取消通知    public  void  cancelupdateNotification(){        notificationManager.cancel(NOTIFICATION_ID);    }    public void sendNotification(){        Intent intent=new Intent(ACTION_UPDATE_NOTIFICATION);        PendingIntent pendingIntent=PendingIntent.getBroadcast(this,NOTIFICATION_ID,intent,PendingIntent.FLAG_UPDATE_CURRENT);        NotificationCompat.Builder notifyBuilder = getNotificationBuilder();        notifyBuilder.addAction(R.drawable.ic_update,"update",pendingIntent);        notificationManager.notify(NOTIFICATION_ID, notifyBuilder.build());        setbuttonstate(false,true,true);    }    void setbuttonstate(Boolean isNotifyEnabled,Boolean isUpdadateEnabled,Boolean isCancelEnabled){        Button update=(Button) findViewById(R.id.update);        Button notify=(Button) findViewById(R.id.notify);        Button cancel=(Button) findViewById(R.id.cancel);        notify.setEnabled(isNotifyEnabled);        update.setEnabled(isUpdadateEnabled);        cancel.setEnabled(isCancelEnabled);    }    public void   createNotificationChannel(){        notificationManager=            (NotificationManager)getSystemService(NOTIFICATION_SERVICE);        if (Build.VERSION.SDK_INT>=android.os.Build.VERSION_CODES.O){            NotificationChannel notificationChannel=                    new NotificationChannel(PRIMARY_CHANNEL_ID,                            "123" ,NotificationManager.IMPORTANCE_HIGH                            );            notificationChannel.enableLights(true);            notificationChannel.setLightColor(Color.RED);            notificationChannel.enableVibration(true);            notificationChannel.setDescription("hihi");            notificationManager.createNotificationChannel(notificationChannel);        }    }    private NotificationCompat.Builder getNotificationBuilder(){        Intent notifyIntent=new Intent(this,MainActivity.class);        PendingIntent notifyPendingIntent=PendingIntent.getActivity(this,                NOTIFICATION_ID,notifyIntent,PendingIntent.FLAG_UPDATE_CURRENT);        NotificationCompat.Builder notifyBuilder=                new NotificationCompat.Builder(this,PRIMARY_CHANNEL_ID)                        .setContentTitle("notify~~~")                        .setContentText("uuko notify!!")                        .setSmallIcon(R.drawable.ic_launcher_background)                        .setContentIntent(notifyPendingIntent)                        .setAutoCancel(true);        return notifyBuilder;    }    public class  NotificationReciever extends BroadcastReceiver{        public NotificationReciever(){        }        @Override        public void onReceive(Context context, Intent intent) {            updateNotification();        }    }}