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);    }}