Android SystemUI 添加USBOTG存储设备卸载按钮

来源：互联网发布：什么营销软件好编辑：程序博客网时间：2024/06/05 06:07

需求是，当插入USB设备时，在下拉状态栏里出现一个图标按钮，点击后卸载USBotg存储，同时，卸载完成时，该按钮消失。

实现思路，当插入USB存储时，通知栏会弹出“正在准备USB存储设备是否有误”，通过这句话找到弹出的位置发送一个自定义广播，然后在SystemUI里监听该广播更新存储按钮的状态即可。

先看插入时通知栏提示的代码位置

frameworks/base/packages/SystemUI/src/com/android/systemui/usb/StorageNotification.java

if (newState.equals(Environment.MEDIA_CHECKING)) {140             /*141              * Storage is now checking. Update media notification and disable142              * UMS notification.143              */144             setMediaStorageNotification(145                     com.android.internal.R.string.ext_media_checking_notification_title,146                     com.android.internal.R.string.ext_media_checking_notification_message,147                     com.android.internal.R.drawable.stat_notify_sdcard_prepare, true, false, null);148             updateUsbMassStorageNotification(false);                                   149         }

如以上代码所示if里的判断条件是MEDIA_CHECKING。接下去的一个if就是MEDIA_MOUNTED在这个状态中发送广播即可

if (newState.equals(Environment.MEDIA_MOUNTED)) { 150             Intent intent = new Intent();  151             intent.setAction("com.socsi.USB"); //设置意图发送广播  152              intent.putExtra("usb","mounted"); //参数是挂载了153             mContext.sendBroadcast(intent,null); //发送154             /*155              * Storage is now mounted. Dismiss any media notifications,156              * and enable UMS notification if connected.157              */158             setMediaStorageNotification(0, 0, 0, false, false, null);159             updateUsbMassStorageNotification(mUmsAvailable);160         }

同理在MEDIA_UNMOUNTED和MEDIA_BAD_REMOVAL里也添加发送卸载USB存储设备的广播。

if (newState.equals(Environment.MEDIA_UNMOUNTED)) {//正常卸载状态161                         Intent intent = new Intent();  162                         intent.setAction("com.socsi.USB");  163                         intent.putExtra("usb","unmounted");164                         mContext.sendBroadcast(intent,null); 165     ………………//省略无关代码

if (newState.equals(Environment.MEDIA_BAD_REMOVAL)) {//直接拔出状态244             /*245              * Storage has been removed unsafely. Show bad removal media notification,246              * and disable UMS notification regardless of connection state.247              */248             Intent intent = new Intent();  249             intent.setAction("com.socsi.USB");  250             intent.putExtra("usb","unmounted");251             mContext.sendBroadcast(intent,null); 252             setMediaStorageNotification(253                     com.android.internal.R.string.ext_media_badremoval_notification_title,254                     com.android.internal.R.string.ext_media_badremoval_notification_message,255                     com.android.internal.R.drawable.stat_sys_warning,256                     true, true, null);257             updateUsbMassStorageNotification(false);258         }

发送状态的代码也就完成了。

现在看看添加的新按钮，关于如何添加新按钮博客已经非常之多了。可以参考

http://blog.csdn.net/lyjit/article/details/51579067

 45 public class SdcardTile extends QSTile<QSTile.BooleanState> { 46     private final String TAG = "qs_sdcard"; 47      48     private StorageManager mStorageManager; 49     private IMountService mMountService; 52 private boolean mountState = false; 53     public SdcardTile(Host host) {

 54         super(host); 55         IntentFilter filter = new IntentFilter();  //注册监听广播 56         filter.addAction("com.socsi.USB");   57         mContext.registerReceiver(mReceiver, filter);   58  67     } 73  74     @Override 75     public void handleClick() {//处理按钮点击事件 76         if(mountState) { 77             Toast.makeText(mContext, "系统将卸载USB存储设备" ,Toast.LENGTH_SHORT).show();//弹出一个提示吐司 78             IMountService mountService = getMountService(); 79             try { 80                 mountService.unmountVolume("/storage/usbotg", true, false);//卸载设备 81             } catch (RemoteException e) { 82                 // Informative dialog to user that unmount failed. 83                 Toast.makeText(mContext, "卸载失败" ,Toast.LENGTH_SHORT).show(); 84             } 85         }    86     } 87  88     private synchronized IMountService getMountService() {                              89         if (mMountService == null) { 90             IBinder service = ServiceManager.getService("mount"); 91             if (service != null) { 92                 mMountService = IMountService.Stub.asInterface(service); 93             } else { 94                 Log.e("luomf", "Can't get mount service"); 95             } 96         } 97         return mMountService; 98     } 99 103 104 105     @Override106     protected void handleUpdateState(BooleanState state, Object arg) {107         Log.d(TAG,"handleUpdateState");108         state.visible = false;//按钮默认不显示109         state.label = mContext.getString(R.string.quick_settings_no_otg);//按钮图标下面的字符串110         state.icon = ResourceIcon.get(R.drawable.usb_attach);//按钮的图标111         if(mountState){112             state.visible = true;//如果挂载了则显示按钮113         }else{114             state.visible = false;//否则不显示按钮115         }116     }117 118     119     private BroadcastReceiver mReceiver = new BroadcastReceiver(){  120 121         @Override  122         public void onReceive(Context context, Intent intent) {123             String mountstate = intent.getExtras().getString("usb");  124             Log.d("luomf", "接收到:"+mountstate);  125             mountState = mountstate.equals("mounted") ? true:false;126             refreshState(true);//这句话会刷新handleUpdateState127         }  128 129     };

以上就是关于弹出图标、消失图标与卸载的逻辑实现方法。

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