Notification消息通知（消息合并且显示条数，自定义消息通知内容布局）

没找到原创作者，所以也不知道来自何处，只有等以后知道原创作者后再补上来源网址！！！

具体操作：自定义消息通知内容布局；点击界面中心的“点击发送消息”TextView控件，模拟发送通知消息，通知栏接收消息，点击几次则发送几次，点击通知栏消息，跳转到详情界面。

1.activity_main.xml：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
tools:context=".MainActivity">

<TextView
android:id="@+id/tv_show"
android:text="点击发送消息"
android:textSize="24sp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

</LinearLayout>

2.layout_item.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" >

<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:src="@mipmap/ic_launcher" />

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="18dp"
android:layout_toRightOf="@+id/imageView1"
android:text="TextView" />

<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="15dp"
android:text="TextView" />

<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView1"
android:layout_marginLeft="54dp"
android:layout_toRightOf="@+id/textView2"
android:text="TextView" />

<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_below="@+id/textView1"
android:text="TextView" />

</RelativeLayout>

3.activity_detail.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/name"
android:textSize="18sp"
android:layout_gravity="center_horizontal"/>

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/price"
android:textSize="18sp"
android:layout_gravity="center_horizontal"/>

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Text"
android:id="@+id/detail"
android:textSize="18sp"
android:layout_gravity="center_horizontal"/>
</LinearLayout>

4.SingletonF类：

/**
* 用于存储消息数目
* Created by admin on 2017/9/4.
*/

public class SingletonF{

private  int info_number=0;

private static class SingletonHolder {
/**
* 单例对象实例
*/
static final SingletonF INSTANCE = new SingletonF();
}

public static SingletonF getInstance() {
return SingletonHolder.INSTANCE;
}

/**
* private的构造函数用于避免外界直接使用new来实例化对象
*/
private SingletonF() {}

public  int getInfo_number() {
return info_number;
}

public  void setInfo_number(int info_number) {
this.info_number = info_number;
}

//    /**
//     * 若SingletonF implements Serializable则必须实现readResolve方法
//     * readResolve方法应对单例对象被序列化时候
//     */
//    private Object readResolve() {
//        return getInstance();
//    }

}

5.MyBroadcastReceiver类：

import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.support.v4.app.NotificationCompat;
import android.util.Log;
import android.widget.RemoteViews;

public class MyBroadcastReceiver extends BroadcastReceiver {

private SingletonF singletonF;
private Context context1;

@Override
public void onReceive(Context context, Intent intent) {
this.context1 = context;
//      if (intent.getStringExtra("info").equals("广播发送了")) {
//          Log.i("静态广播：", "广播我已经接受了");
//      }
Message message = handler.obtainMessage();
message.what = 0;
handler.sendMessage(message);
}

private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 0:
singletonF = SingletonF.getInstance();
int first = singletonF.getInfo_number();
first++;
Date nowTime = new Date(System.currentTimeMillis());
SimpleDateFormat sdFormatter = new SimpleDateFormat("HH:mm");
String retStrFormatNowDate = sdFormatter.format(nowTime);
singletonF.setInfo_number( first);

RemoteViews contentViews = new RemoteViews(context1.getPackageName(), R.layout.layout_item);
// 通过控件的Id设置属性
contentViews.setImageViewResource(R.id.imageView1, R.mipmap.ic_launcher_round);
contentViews.setTextViewText(R.id.textView1, "消息标题");
contentViews.setTextViewText(R.id.textView2, "消息内容");
contentViews.setTextViewText(R.id.textView3, " (" + first + "条新消息)");
contentViews.setTextViewText(R.id.textView4, "" + retStrFormatNowDate);
// 点击通知栏跳转的activity
Intent intent = new Intent(context1, ActDetail.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context1, 0, intent,
PendingIntent.FLAG_CANCEL_CURRENT);

NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(context1)
.setSmallIcon(R.mipmap.ic_launcher_round).setTicker("new message");
// 自动管理通知栏消息
mBuilder.setAutoCancel(true);
mBuilder.setContentIntent(pendingIntent);
/// 自定义布局
mBuilder.setContent(contentViews);
// 使用默认提示音
mBuilder.setDefaults(Notification.DEFAULT_ALL);
NotificationManager mNotificationManager = (NotificationManager) context1
.getSystemService(context1.NOTIFICATION_SERVICE);
// notify(int id, Notification notification)若id为同一个值，则通知栏只会显示一行，并不停更新此消息内容
// 若为类似UUID.randomUUID().hashCode()这样不同的唯一标识符，则有几条消息通知栏就显示几行
mNotificationManager.notify(1, mBuilder.build());

break;
default:
break;
}
}
};

}

6.MainActivity类：

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private TextView tv_show;
private int btn_number = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

tv_show = (TextView) this.findViewById( R.id.tv_show);
tv_show.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
showNotify();
btn_number++;
tv_show.setText("发送了" + btn_number + "次广播");
}
});
}

private void showNotify() {
Intent intent = new Intent();
intent.setAction("MASSAGE_NOTIFICATION");
//        intent.putExtra("info", "广播发送了");
sendBroadcast(intent);
}

@Override
protected void onStop() {
btn_number = 0;
tv_show.setText("发送了" + btn_number + "次广播");
super.onStop();
}

@Override
protected void onPause() {
btn_number = 0;
tv_show.setText("发送了" + btn_number + "次广播");
super.onPause();
}

@Override
protected void onDestroy() {
btn_number = 0;
super.onDestroy();
}

}

7.ActDetail类：

import android.app.NotificationManager;
import android.content.Context;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;

/**
* Created by admin on 2017/9/4.
*/

public class ActDetail extends AppCompatActivity{

NotificationManager notificationManager;
SingletonF singletonF;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);

singletonF = SingletonF.getInstance();
notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.cancel(1);
singletonF.setInfo_number(0);
}
}