安卓学习-界面-ui-Notification

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="horizontal" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="发送通知" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="关闭通知" />

</LinearLayout>

public class MainActivity extends Activity {

    NotificationManager nm;
    Button btn1;
    Button btn2;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        //获取系统的NotificationManager服务
        nm=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
        
        btn1=(Button)findViewById(R.id.button1);
        btn2=(Button)findViewById(R.id.button2);
        
        btn1.setOnClickListener(new OnClickListener() {
                public void onClick(View v) {
                
                Intent intent=new Intent(MainActivity.this,LoginActivity.class);
                //对intent进行包装
                PendingIntent pi=PendingIntent.getActivity(MainActivity.this, 0, intent, 0);
                //创建通知
                Notification nf=new Notification.Builder(MainActivity.this)
                            //是否自动关闭
                            .setAutoCancel(true)
                            //通知的提示信息
                            .setTicker("有新消息")
                            //小图标
                            .setSmallIcon(R.drawable.ic_launcher)
                            //通知标题
                            .setContentTitle("一条新的通知")
                            //通知内容
                            .setContentText("有新的通知，点击查看")
                            //设置系统默认声音，默认LED灯
                            //.setDefaults(Notification.DEFAULT_SOUND|Notification.DEFAULT_LIGHTS)
                            //设置自定义声音
                            //.setSound(sound)
                            //什么时候启动
                            .setWhen(System.currentTimeMillis())
                            //设置该通知要启动的intent
                            .setContentIntent(pi).build();
                //发送
                nm.notify(1234, nf);                            
            }
        });
        
        btn2.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                //取消
                nm.cancel(1234);
            }
        });

    }
}