Notification(二)——PendingIntent的flag导致数据相同的问题

package cc.cu;

import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
/**
* Demo描述:
* 两个Notification均使用Intent携带数据时.当收到第一个通知时取出其携带的数据没有问题,数据准确;
* 但是当收到第二个通知时取出其携带的数据时,居然发现是第一个通知携带的数据.
* 当时出现这个问题时,第一感觉问题在于
* NotificationManager.notify(int id, Notification notification)
* 方法里的id值相同造成的.但将其修改为不同的值后发现问题依旧.
*
* 后来发现问题出现于方法:
* PendingIntent.getActivity(Context context, int requestCode, Intent intent, int flags)
* 的最后一个参数.该值共有四个常量.最好是使用PendingIntent.FLAG_UPDATE_CURRENT,该值的解释如下:
*
* Flag indicating that if the described PendingIntent already exists,
* then keep it but replace its extra data with what is in this new Intent
*
* 如果PendingIntent已经存在,那么保留它并且只替换它的extra数据
*
* 参考资料:
* 1 http://blog.csdn.net/lilu_leo/article/details/8491738 * 2 http://developer.android.com/reference/android/app/PendingIntent.html#FLAG_UPDATE_CURRENT * 3 http://blog.csdn.net/vipzjyno1/article/details/25248021 *   Thank you very much
*   在资料3中对于Notification作了很全面和详细的介绍.有兴趣的可以看看.
*
* 备注说明:
* 测试环境Android2.3.6
*
*/
public class MainActivity extends Activity {
private Context mContext;
private Button mFirstButton;
private Button mSecondButton;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
// 取出通知携带的数据
if (this.getIntent().getExtras() != null) {
String data = this.getIntent().getExtras().getString("testData");
System.out.println("得到通知传过来的数据:" + data);
}
}

private void init() {
mContext = this;

mFirstButton = (Button) findViewById(R.id.sendFirstNotificationButton);
mFirstButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
sendFirstNotification();
}
});

mSecondButton = (Button) findViewById(R.id.sendSecondNotificationButton);
mSecondButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
sendSecondNotification();
}
});
}

// 发送通知
private void sendFirstNotification() {
Notification notification = new Notification();
Intent intent = new Intent(mContext, MainActivity.class);
intent.putExtra("testData", "来自first的数据");
// PendingIntent pendingIntent=PendingIntent.getActivity(mContext, 0,intent, 0);//error code
PendingIntent pendingIntent = PendingIntent.getActivity(mContext, 0,intent, PendingIntent.FLAG_UPDATE_CURRENT);
notification.icon = R.drawable.ic_launcher;
notification.defaults = Notification.DEFAULT_SOUND;
notification.flags |= Notification.FLAG_AUTO_CANCEL;
notification.tickerText = "第一个通知";
notification.setLatestEventInfo(mContext, "通知1", "来自第一个按钮触发的通知",pendingIntent);
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(0, notification);
}

// 发送通知
private void sendSecondNotification() {
Notification notification = new Notification();
Intent intent = new Intent(mContext, MainActivity.class);
intent.putExtra("testData", "来自second的数据");
// PendingIntent pendingIntent=PendingIntent.getActivity(mContext, 0,intent, 0);//error code
PendingIntent pendingIntent = PendingIntent.getActivity(mContext, 0,intent, PendingIntent.FLAG_UPDATE_CURRENT);
notification.icon = R.drawable.ic_launcher;
notification.defaults = Notification.DEFAULT_SOUND;
notification.flags |= Notification.FLAG_AUTO_CANCEL;
notification.tickerText = "第二个通知";
notification.setLatestEventInfo(mContext, "通知2", "来自第二个按钮触发的通知",pendingIntent);
NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
notificationManager.notify(1, notification);
}

}

<RelativeLayout 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"
>

<Button
android:id="@+id/sendFirstNotificationButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="100dip"
android:text="发送第一个通知" />

<Button
android:id="@+id/sendSecondNotificationButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="200dip"
android:text="发送第二个通知" />

</RelativeLayout>