原文：https://blog.csdn.net/uyy203/article/details/55517723

先上效果圖，重點在實現功能，界面比較隨便

1.通知欄中顯示自定義的消息布局樣式

image.png

2點擊消息回到Activity 界面，并點擊 print 鍵6次

image.png

3.在Activity中點擊6次 print 鍵后，可簡單這時通知欄中消息提示收到這6次的點擊信號。再點擊 ← 兩次，點擊 → 3次，然后回到Activity中

image.png

4.回到Activity 中可看見，Activity 接收到信號， ←被點擊 兩次， → 被點擊 3次

image.png

5.點擊清除，可以讓通知欄中的消息通知消失，點擊顯示，能讓消息通知再次出現

從實現過程中看，如果需要從Activity向Notification發送信號，利用NotificationManage的notify方法刷新即可。如果需要從Notification向Activity發送信號，需要在Activity中使用廣播接收者。

//自定義Notification布局文件
//notification.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000"
    android:gravity="center_vertical"
    >
 
    <ImageView
        android:id="@+id/im"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@mipmap/ic_launcher"
        android:layout_alignParentLeft="true"
        />
 
 
    <LinearLayout
        android:orientation="horizontal" android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_toRightOf="@id/im"
        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        >
 
    <Button
        android:id="@+id/btn"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:text="←"
        android:background="@color/colorPrimary"
        android:gravity="center"
        android:textSize="25dp"
        />
 

 
    <Button
        android:id="@+id/btn2"
        android:layout_width="50dp"
        android:layout_height="50dp"
        android:text="→"
        android:background="@color/colorAccent"
        android:gravity="center"
        android:textSize="25dp"
        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        />
 
 
        <TextView
            android:id="@+id/showTv"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="wq"
            android:textColor="@color/colorPrimaryDark"
            android:layout_marginLeft="@dimen/activity_horizontal_margin"
            android:textSize="25dp"
            />
 
    </LinearLayout>
 
</RelativeLayout>

//MainActivity.java

import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.app.NotificationCompat;
import android.view.View;
import android.widget.Button;
import android.widget.RemoteViews;
import android.widget.TextView;
 
public class MainActivity extends AppCompatActivity {
    private int i=0;
    private int j=0;
    private int k=0;
    private Button btn;
    private Button clear_btn;
    private Button show_btn;
    private Button print;
    private TextView tx1;
    private TextView tx2;
    private TextView showTv;
    private ButtonBroadcastReceiver bReceiver;
    public static final String ACTION_BUTTON = "intent_action";
    static NotificationManager manager;
    static NotificationCompat.Builder builder;
    private static RemoteViews mRemoteViews;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tx1=(TextView) findViewById(R.id.tx1);
        tx2=(TextView) findViewById(R.id.tx2);
        clear_btn=(Button)findViewById(R.id.clear_btn);
        print=(Button)findViewById(R.id.print);
        show_btn=(Button)findViewById(R.id.show_btn);
 
 
 
 
                manager = (NotificationManager) getBaseContext().getSystemService(getBaseContext().NOTIFICATION_SERVICE);
 
                initBttonReceiver();//注冊按鍵廣播接收者
 
                showNotifictionIcon(getBaseContext());//顯示通知
 
                //清除消息通知
                clear_btn.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        manager.cancel(0);
            }
        });
 
 
        //顯示消息通知按鈕
        show_btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                manager.notify(0,builder.build());
            }
        });
 
        //每點擊一個，消息通知中的數字便會+1
        print.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                k++;
                mRemoteViews.setTextViewText(R.id.showTv,""+k);
                manager.notify(0,builder.build());
            }
        });
 
 
 
 
 
 
    }
 
    //消息通知設置和顯示
    public static void showNotifictionIcon(Context context) {
        builder = new NotificationCompat.Builder(context);
        mRemoteViews = new RemoteViews(context.getPackageName(), R.layout.notification);
        mRemoteViews.setViewVisibility(R.id.btn, View.VISIBLE);
        Intent intent = new Intent(context, MainActivity.class);//將要跳轉的界面
        intent.addCategory(Intent.CATEGORY_LAUNCHER);
        intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);//activity啟動模式為：singleTop
 
 
        builder.setAutoCancel(false);//點擊是否后消失
        builder.setSmallIcon(R.mipmap.ic_launcher);//設置通知欄消息標題的頭像
//        builder.setDefaults(NotificationCompat.DEFAULT_SOUND);//設置通知鈴聲
        builder.setTicker("通知");
        builder.setContentTitle("通知");
        builder.setOngoing(true);
 
 
        Intent buttonIntent =new Intent(ACTION_BUTTON);
        buttonIntent.putExtra("ButtonId", 1);
        //假如在同一個requestCode下，使用FLAG_UPDATE_CURRENT，最新接收的廣播消息中的Intent的extra會替換掉舊的廣播消息Intent的extra
        PendingIntent intent_btn=PendingIntent.getBroadcast(context,1,buttonIntent,PendingIntent.FLAG_UPDATE_CURRENT);
        mRemoteViews.setOnClickPendingIntent(R.id.btn,intent_btn);
 
        buttonIntent.putExtra("ButtonId",2);
        intent_btn=PendingIntent.getBroadcast(context,2,buttonIntent,PendingIntent.FLAG_UPDATE_CURRENT);
        mRemoteViews.setOnClickPendingIntent(R.id.btn2,intent_btn);
 
 
        //利用PendingIntent來包裝我們的intent對象,使其延遲跳轉
        builder.setContent(mRemoteViews);
        //假如在同一個requestCode下，使用FLAG_CANCEL_CURRENT，會把舊的廣播消息Intent 中的extra清除掉
        PendingIntent intentPend = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);
        builder.setContentIntent(intentPend);
 
        //刷新通知
        manager.notify(0, builder.build());
    }
 
    //初始化廣播接收器
    public void initBttonReceiver() {
        bReceiver=new ButtonBroadcastReceiver();
        IntentFilter intentFilter=new IntentFilter();
        intentFilter.addAction(ACTION_BUTTON);
        registerReceiver(bReceiver,intentFilter);
 
    }
 
 
    //廣播接收類
    public  class ButtonBroadcastReceiver extends BroadcastReceiver{
        @Override
        public void onReceive(Context context, Intent intent) {
            String action=intent.getAction();
            if(action.equals(ACTION_BUTTON)){
                int buttonId=intent.getIntExtra("ButtonId",0);
                switch (buttonId){
                    case 1:
                        i++;
                        tx1.setText("點擊了←"+i+"次");
                        break;
                    case 2:
                        j++;
                        tx2.setText("點擊了→"+j+"次");
                    default:
                        break;
                }
            }
        }
    }
 
 
 
 
}

github : https://github.com/Cedric-Xuan/CustomNotificationDemo