Android应用图标在状态栏上显示实现原理

一、前方
在研究《Android类似360,QQ管家那样的悬浮窗》突发奇想，想把应用的图标也显示到状态栏上，类似手机QQ，而有消息来时改变状态栏上的图标显示。
二、原理
其实很研究完后，才发现，很简单：
2.1 显示图标在状态栏上
代码如下:
NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
Notification n = new Notification(
resId, "Floats Start!", System.currentTimeMillis());
// 将此通知放到通知栏的"OnGoing"即"正在运行"组中
n.flags |= Notification.FLAG_ONGOING_EVENT;
// 表明在点击了通知栏中的"清除通知"后，此通知不清除，
// 经常与FLAG_ONGOING_EVENT一起使用
n.flags |= Notification.FLAG_NO_CLEAR;
PendingIntent pi = PendingIntent.getActivity(this, 0, getIntent(), 0);
n.contentIntent = pi;
n.setLatestEventInfo(this, "FloatsWindow", "start!", pi);
nm.notify(NOTIFICATION_ID_ICON, n);

2.2 修改图标的显示
不用cancel这个通知，只需传入不同的resId，再通知即可。
代码如下:
package com.chris.floats.window;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.view.Gravity;
import android.view.WindowManager;
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
public class MainActivity extends Activity {
private static WindowManager mWindowMgr = null;
private WindowManager.LayoutParams mWindowMgrParams = null;
private static FloatsWindowView mFloatsWindowView = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
protected void onStop() {
super.onStop();
deleteIconToStatusbar();
}

@Override
public void onWindowFocusChanged(boolean hasFocus) {
if(hasFocus){
if(mFloatsWindowView != null){
mWindowMgr.removeView(mFloatsWindowView);
mFloatsWindowView = null;
}
addIconToStatusbar(R.drawable.a0);
}else{
getWindowLayout();
addIconToStatusbar(R.drawable.ic_launcher);
}
}
private void initParams(){
DisplayMetrics dm = getResources().getDisplayMetrics();
mWindowMgrParams.x = dm.widthPixels - 136;
mWindowMgrParams.y = 300;
mWindowMgrParams.width = 136;
mWindowMgrParams.height = 136;
}
private void getWindowLayout(){
if(mFloatsWindowView == null){
mWindowMgr = (WindowManager)getBaseContext().getSystemService(Context.WINDOW_SERVICE);
mWindowMgrParams = new WindowManager.LayoutParams();

mWindowMgrParams.type = 2003;
mWindowMgrParams.fORMat = 1;

mWindowMgrParams.flags = 40;
mWindowMgrParams.gravity = Gravity.LEFT | Gravity.TOP;
initParams();
mFloatsWindowView = new FloatsWindowView(this);
mWindowMgr.addView(mFloatsWindowView, mWindowMgrParams);
}
}
private final static int NOTIFICATION_ID_ICON = 0x10000;

private void addIconToStatusbar(int resId){
NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
Notification n = new Notification(
resId, "Floats Start!", System.currentT imeMillis());
// 将此通知放到通知栏的"Ongoing"即"正在运行"组中
n.flags |= Notification.FLAG_ONGOING_EVENT;
// 表明在点击了通知栏中的"清除通知"后，此通知不清除，
// 经常与FLAG_ONGOING_EVENT一起使用
n.flags |= Notification.FLAG_NO_CLEAR;
PendingIntent pi = PendingIntent.getActivity(this, 0, getIntent(), 0);
n.contentIntent = pi;
n.setLatestEventInfo(this, "FloatsWindow", "start!", pi);
nm.notify(NOTIFICATION_ID_ICON, n);
}
private void deleteIconToStatusbar(){
NotificationManager nm = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
nm.cancel(NOTIFICATION_ID_ICON);
}
}

以上就是源码，当应用的焦点变化时，状态栏上的图片也会跟着变化。
源码下载地址：Http://download.csdn.net/detail/qingye_love/5506825 您可能感兴趣的文章:Android 状态栏的设置适配问题详解Android系统更改状态栏字体颜色android 动态控制状态栏显示和隐藏的方法实例Android 去掉状态栏的方法汇总3种Android隐藏顶部状态栏及标题栏的方法Android自定义状态栏颜色与应用标题栏颜色一致Android实现修改状态栏背景、字体和图标颜色的方法Android 实现沉浸式状态栏的方法Android动态控制状态栏显示和隐藏Android状态栏的适配汇总