Android之Notification

activity_main如下：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/linearLayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center"
    android:orientation="vertical"
    tools:context="com.imooc.notification.MainActivity" >


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


    <Button
        android:id="@+id/btn_cancel"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="取消通知" />


</LinearLayout>

MainActivity代码如下：

public class MainActivity extends Activity implements OnClickListener {
private NotificationManager notificationManager; //通知控件类
int nottification_id;

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


notificationManager = (NotificationManager).getSystemService(Context.NOTIFICATION_SERVICE);
findViewById(R.id.btn_enter).setOnClickListener(this);
findViewById(R.id.btn_cancel).setOnClickListener(this);
}


@Override
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()) {
case R.id.btn_enter:
sendNotification();
break;


case R.id.btn_cancel:
notificationManager.cancel(nottification_id);
break;
}
}


/**
* 构造notification并发送通知
*/
@SuppressLint("NewApi")
private void sendNotification() {
Intent intent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
Builder builder = new Notification.Builder(this);
builder.setSmallIcon(R.drawable.ic_launcher);
builder.setTicker("Hello,World!"); // 手机状态栏提示
builder.setWhen(System.currentTimeMillis()); // 设置当前系统时间
builder.setContentTitle("设置通知栏通知"); // 设置消息标题
builder.setContentText("我来自Notification"); // 设置内容
builder.setContentIntent(pendingIntent); // 设置点击后的事件
// builder.setDefaults(Notification.DEFAULT_SOUND); // 设置提示声音
// builder.setDefaults(Notification.DEFAULT_LIGHTS); // 设置提示灯
// builder.setDefaults(Notification.DEFAULT_VIBRATE); // 设置震动
builder.setDefaults(Notification.DEFAULT_ALL); // 设置以上三个
Notification notification = builder.build(); // Android 4.1 以上
// builder.getNotification();
notificationManager.notify(nottification_id, notification);
}
}