Android 呼吸灯流程分析（一）

一、Android 呼吸灯的使用

在讲呼吸灯实现流程之前，我们先看一下如何使用它。
Android提供了呼吸灯的接口，我们可以通过该接口，控制呼吸灯的闪烁频率和占空比。具体代码如下：

[java] view plaincopyprint?

package com.example.test;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
public class MainActivity extends Activity {
Button working;
EditText ledOn;
EditText ledOff;
final int ID_LED=19871103;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ledOn = (EditText)findViewById(R.id.LedOn);
ledOff = (EditText)findViewById(R.id.LedOff);
working = (Button)findViewById(R.id.bu1);
working.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
NotificationManager nm=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
Notification notification = new Notification();
notification.ledARGB = 0xffff0000; //这里是颜色，我们可以尝试改变，理论上0xFFff0000是红色
// notification.ledOnMS = 350;
// notification.ledOffMS = 300;
notification.ledOnMS = Integer.parseInt((ledOn.getText().toString()));
notification.ledOffMS = Integer.parseInt((ledOff.getText().toString()));
notification.flags = Notification.FLAG_SHOW_LIGHTS;
nm.notify(ID_LED, notification);
}
});
//nm.cancel(ID_LED);
}
}

package com.example.test;import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;public class MainActivity extends Activity {Button working;EditText ledOn;EditText ledOff;    final int ID_LED=19871103;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ledOn = (EditText)findViewById(R.id.LedOn);ledOff = (EditText)findViewById(R.id.LedOff);working = (Button)findViewById(R.id.bu1);working.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubNotificationManager nm=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);Notification notification = new Notification();notification.ledARGB = 0xffff0000; //这里是颜色，我们可以尝试改变，理论上0xFFff0000是红色
//              notification.ledOnMS = 350;
//              notification.ledOffMS = 300;notification.ledOnMS = Integer.parseInt((ledOn.getText().toString()));notification.ledOffMS = Integer.parseInt((ledOff.getText().toString()));notification.flags = Notification.FLAG_SHOW_LIGHTS;nm.notify(ID_LED, notification);}});//nm.cancel(ID_LED);}
}

通过该程序，便能自由控制呼吸灯的占空比与频率。

二、Android上层呼吸灯的实现

1、NotificationManager

(1).在apk中我们填充了结构notification，并调用了nm.notify。很显然，找到了关键点NotificationManager，对应文件为：
frameworks/base/core/java/android/app/NotificationManager.java

(2).在NotificationManager.java中找到了我们的调用方法notify。对应如下：