android的Service和Notification学习

在安卓应用中经常看到比如一连接网络某个应用就在状态栏上更新一些信息

今天花了一个下午研究下贴上代码:

package com.example.study;
 
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
 
public class MainActivity extends Activity implements OnClickListener {
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Intent intent = getIntent();
        String data = intent.getStringExtra("data");
        if (data != null && data.equals("data")
                && ServiceDemo.notificationManager != null) {
            ServiceDemo.notificationManager.cancel(0);
            ServiceDemo.notificationManager=null;
        }
    }
 
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
 
    public boolean detect(Context con) {
 
        ConnectivityManager manager = (ConnectivityManager) con
                .getApplicationContext().getSystemService(
                        Context.CONNECTIVITY_SERVICE);
 
        if (manager == null) {
            return false;
        }
 
        NetworkInfo networkinfo = manager.getActiveNetworkInfo();
 
        if (networkinfo == null || !networkinfo.isAvailable()) {
            return false;
        }
 
        return true;
    }
 
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.start_service:
            this.startService(new Intent(this, ServiceDemo.class));
            break;
 
        default:
            break;
        }
    }
 
}

　　service代码:

package com.example.study;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.util.Log;

public class ServiceDemo extends Service {
    public static NotificationManager notificationManager;
    Handler mHandler = new Handler() {

        public void handleMessage(Message msg) {
            switch (msg.what) {
            case 1:
                if (notificationManager == null) {
                    addNotificaction();
                }
                break;
            default:
                break;
            }
        }
    };

    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        new Thread(new Runnable() {

            @Override
            public void run() {
                while (true) {
                    try {
                        Thread.sleep(1000 * 60);
                    } catch (Exception e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    Boolean b = detect(ServiceDemo.this);
                    System.out.println(b);
                    if (b) {
                        Message msg = new Message();
                        msg.what = 1;
                        mHandler.sendMessage(msg);
                    }
                }

            }
        }).start();
    }

    private void addNotificaction() {
        Notification notification = new Notification(R.drawable.ic_launcher,
                "Notification测试", System.currentTimeMillis());
        notificationManager = (NotificationManager) this
                .getSystemService(Context.NOTIFICATION_SERVICE);
        Intent startintent = new Intent(this, MainActivity.class);
        startintent.putExtra("data", "data");
        PendingIntent pendingIntent02 = PendingIntent.getActivity(this, 0,
                startintent, 0);
        notification.setLatestEventInfo(this, "测试", "跳转到主界面", pendingIntent02);
        notificationManager.notify(0, notification);

    }

    public boolean detect(Context con) {

        ConnectivityManager manager = (ConnectivityManager) con
                .getApplicationContext().getSystemService(
                        Context.CONNECTIVITY_SERVICE);

        if (manager == null) {
            return false;
        }

        NetworkInfo networkinfo = manager.getActiveNetworkInfo();

        if (networkinfo == null || !networkinfo.isAvailable()) {
            return false;
        }

        return true;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        Log.v("CountService", "on destroy");
    }

}
代码下载:http://download.csdn.net/detail/wenwei19861106/4566084