Android应用图标在状态栏上显示，以及显示不同的图标
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
[java] view plaincopy
- 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。
[java] view plaincopy
- 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();
- }
- /*
- * 显示应用主界面时，去除悬浮层
- * 修改状态栏上的图标
- */
- @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();
- /*
- * 2003 在指悬浮在所有界面之上
- * (4.0+系统中，在下拉菜单下面，而在2.3中，在上拉菜单之上)
- */
- mWindowMgrParams.type = 2003;
- mWindowMgrParams.format = 1;
- /*
- * 代码实际是wmParams.flags |= FLAG_NOT_FOCUSABLE;
- * 40的由来是wmParams的默认属性（32）+ FLAG_NOT_FOCUSABLE（8）
- */
- 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;
- /*
- * 如果没有从状态栏中删除ICON，且继续调用addIconToStatusbar,
- * 则不会有任何变化。除了：
- * 如果，将notification中的resId设置不同的图标，则会显示不同
- * 的图标
- */
- private void addIconToStatusbar(int resId){
- 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);
- }
- 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
