在佈局檔案中寫一個button，寫一個sendNotification方法

public void sendNotification(View view){
      //例項化通知管理器
        NotificationManager notificationManager= (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        //例項化通知
        NotificationCompat.Builder builder=new NotificationCompat.Builder(this);
        builder.setContentTitle("系統訊息");
        builder.setContentText("來自系統的訊息");
        builder.setDefaults(NotificationCompat.DEFAULT_ALL);
        builder.setSmallIcon(android.R.drawable.ic_media_play);
        builder.setContentIntent(PendingIntent.getActivity(this,0x102,new Intent(this,RingActivity.class),0));

        Notification notification=builder.build();
        //發出通知.
        notificationManager.notify(0x101,notification);
    }
 

自定義通知欄：

佈局檔案：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    >
    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        />
    <TextView
        android:id="@+id/textView1"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:clickable="true"
        />
    <TextView
        android:id="@+id/textView2"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        />
</LinearLayout>
 

package com.example.android_alarmandnotification;

import android.os.Bundle;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.graphics.Color;
import android.widget.RemoteViews;;
import android.content.Context;
import android.content.Intent;
public class NotifictionActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Notification notification = new Notification();
      //設定圖示，後面的自定義佈局的圖片會覆蓋它，但還是得設定，不然不會顯示到通知欄
        notification.icon = android.R.drawable.ic_media_play;
        notification.tickerText = "來資訊啦";
        notification.when = System.currentTimeMillis();
        notification.flags = Notification.FLAG_AUTO_CANCEL;
     //傳入當前專案的包名，和你通知欄上要顯示的自定義佈局的ID
        RemoteViews remoteViews = new RemoteViews(getPackageName(), R.layout.activity_notifiction);
      //下面都是設定通知欄佈局裡面控制元件的屬性
        remoteViews.setImageViewResource(R.id.imageView1, android.R.drawable.ic_media_play);
        remoteViews.setTextColor(R.id.textView1, Color.RED);
        remoteViews.setTextViewText(R.id.textView1, "今日頭條");
        //	PendingIntent有4種flag.
     //	- FLAG_ONE_SHOT 只執行一次
     //	- FLAG_NO_CREATE 若描述的Intent不存在則返回NULL值
    //	- FLAG_CANCEL_CURRENT 如果描述的PendingIntent已經存在，則在產生新的Intent之前會先取消掉當前的
    //	- FLAG_UPDATE_CURRENT 總是執行,這個flag用的最多
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, MainActivity.class),
                PendingIntent.FLAG_UPDATE_CURRENT);
        remoteViews.setOnClickPendingIntent(R.id.textView1, pendingIntent);
        notification.contentView = remoteViews;
        notification.contentIntent = pendingIntent;
        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        manager.notify(1, notification);
    }
}