Android开发学习笔记-关于Android的消息推送以及前后台切换

下面是最简单的Android的消息推送的实现方法

package com.example.shownotic;

import java.util.Random;

import android.support.v7.app.ActionBarActivity;

import android.app.Notification;

import android.app.NotificationManager;

import android.app.PendingIntent;

import android.content.ComponentName;

import android.content.Context;

import android.content.Intent;

import android.net.Uri;

import android.os.Bundle;

import android.os.SystemClock;

import android.provider.MediaStore.Audio.Media;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class MainActivity extends ActionBarActivity {

    private static final int STATUS_BAR_ID = 0;

    Button btnShowNotic = null;

    private Random random = new Random(20);

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        btnShowNotic = (Button) findViewById(R.id.btnShowNotic);

        btnShowNotic.setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View v) {

                // TODO Auto-generated method stub

                new Thread(new Runnable() {

                    public void run() {

                        while(true)

                        {

                            SystemClock.sleep(30000);

                            showNotic();

                        }

                    }

                }).start();

                showNotic();

            }

        });

    }

    private void showNotic() {

        NotificationManager notificationManger = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

        int icon = R.drawable.ic_launcher;

        CharSequence tickerText = "Gigade";

        long when = System.currentTimeMillis();

        Notification notification = new Notification(icon , tickerText , when );

        notification.flags = Notification.FLAG_AUTO_CANCEL;

        CharSequence contentText = "show:"+random.nextInt(30);

        Intent intent = new Intent();

        intent.setAction(Intent.ACTION_WEB_SEARCH);

        intent.setData(Uri.parse("http://www.baidu.com"));

        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent , 0);

        notification.setLatestEventInfo(this, getTitle(), contentText , contentIntent );

        notificationManger.notify(0, notification );

    }

}