requestCode相同时：

消息栏通知中的manager.notify()的第一个参数相同时

内容更新，实例化PendingIntent时的参数Intent的putExra(this,xxx.class);xxx不变

消息栏通知中的manager.notify()的第一个参数不同时

会生成一条新的消息，原消息的内容不变，点击效果变为第二个PendingIntent,消息的也有点击效果//都更新为最新的PendingIntent

requestCode不同时：

消息栏通知中的manager.notify()的第一个参数相同时

内容更新，实例化PendingIntent时的参数Intent的putExra(this,xxx.class);xxx更新为最新的

消息栏通知中的manager.notify()的第一个参数不同时

会生成一条新的消息，原消息的内容不变，点击效果也不变,新消息也有点击效果//都更新为最新的

public class MainActivity extends Activity {
private TextView num;
private TextView content;
private CheckBox box;
private CheckBox box1;

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

num = (TextView) findViewById(R.id.num);
content = (TextView) findViewById(R.id.content);
box = (CheckBox) findViewById(R.id.checkBox1);
box1 = (CheckBox) findViewById(R.id.checkBox);
Button FLAG_CANCEL_CURRENT = (Button) findViewById(R.id.FLAG_CANCEL_CURRENT);
Button FLAG_UPDATE_CURRENT = (Button) findViewById(R.id.FLAG_UPDATE_CURRENT);
Button FLAG_ONE_SHOT = (Button) findViewById(R.id.FLAG_ONE_SHOT);
Button FLAG_NO_CREATE = (Button) findViewById(R.id.FLAG_NO_CREATE);
FLAG_CANCEL_CURRENT.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
sendNo(PendingIntent.FLAG_CANCEL_CURRENT);
}
});
FLAG_UPDATE_CURRENT.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
sendNo(PendingIntent.FLAG_UPDATE_CURRENT);
}
});
FLAG_ONE_SHOT.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
sendNo(PendingIntent.FLAG_ONE_SHOT);
}
});
FLAG_NO_CREATE.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {
sendNo(PendingIntent.FLAG_NO_CREATE);
}
});

}

@SuppressLint("NewApi")
private void sendNo(int flags) {
NotificationManager manager = (NotificationManager) this
.getSystemService(this.NOTIFICATION_SERVICE);
NotificationCompat.Builder builder1 = new NotificationCompat.Builder(
MainActivity.this);
builder1.setSmallIcon(R.drawable.ic_launcher); // 设置图标
builder1.setTicker("显示第二个通知");// 消息栏弹出来时显示的内容
builder1.setContentTitle("通知"); // 在下拉通知栏中查看通知时，显示的通知的标题
builder1.setContentText(content.getText().toString()); // 在下拉植栏中查看通知时，显示的通知的内容
builder1.setWhen(System.currentTimeMillis()); // 发送时间
builder1.setDefaults(Notification.DEFAULT_ALL); // 设置默认的提示音，振动方式，灯光
builder1.setAutoCancel(true);// 点击后是否消失
RemoteViews view = new RemoteViews(getPackageName(),
R.layout.button_play);

PendingIntent intent1 = PendingIntent.getActivity(this, Integer
.parseInt(num.getText().toString()), new Intent(this,
ThreeActivity.class).putExtra("send", "开始"), 0);// 自定义布局的意图的flag不能相同，相同则只会以最新的为标准
// 设置未知意图监听
view.setOnClickPendingIntent(R.id.play, intent1);

PendingIntent intent2 = PendingIntent.getActivity(this, Integer
.parseInt(num.getText().toString()), new Intent(this,
ThreeActivity.class).putExtra("send", "停止"), 1);// 自定义布局的意图的flag不能相同，相同则只会以最新的为标准
view.setOnClickPendingIntent(R.id.stop, intent2);// 设置位置意图上的自定义布局上的控件的监听

Intent intent = new Intent(MainActivity.this, TwoActivity.class);
PendingIntent pendingIntent = null;

if (box.isChecked()) {
pendingIntent = PendingIntent.getActivity(MainActivity.this,
Integer.parseInt(num.getText().toString()), intent, flags);
} else {
pendingIntent = PendingIntent.getActivity(MainActivity.this, 1,
intent, flags);
}
builder1.setContentIntent(pendingIntent);
Notification notification1 = builder1.build();
// notification1.contentView = view;
if (box1.isChecked()) {
manager.notify(Integer.parseInt(num.getText().toString()),
notification1); // 通过通知管理器发送通知
} else {
manager.notify(1, notification1); // 通过通知管理器发送通知
}
}