Android usb设备权限查询及自动获取详解流程
看到当上面的对话框弹出时,可以使用命令查看顶层的活动窗口
adb shell dumpsys window | findstr mcurrentfocus mcurrentfocus=window{41ab0ee0 u0 com.android.systemui/com.android.systemui.usb.usbpermissionactivity}
这就是应用的位置,当然我们也可以是用grep命令来查找这个对话框的.xml文件,进入android源码然后输入命令:
grep '默认情况下用于' ./ -rn ./systemui/res/values-zh-rcn/strings.xml:51: <string name="always_use_device" msgid="1450287437017315906">"默认情况下用于该 usb 设备"</string> ./systemui/res/values-zh-rcn/strings.xml:52: <string name="always_use_accessory" msgid="1210954576979621596">"默认情况下用于该 usb 配件"</string>
那么这个对话框的路径在
/android/frameworks/base/packages/systemui/res/values-zh-rcn/strings.xml
其相关的内容如下:
<string name="always_use_device" msgid="1450287437017315906">"默认情况下用于该 usb 设备"</string> <string name="usb_device_permission_prompt" msgid="834698001271562057">"允许应用“<xliff:g id="application">%1$s</xliff:g>”访问该 usb 设备吗?"
相关应用路径找到.java文件来修改,其位置在:
/android/frameworks/base/packages/systemui/src/com/android/systemui/usb/usbpermissionactivity.java
这就是那个讨厌的对话框对应的java程序,那么来看看这个程序如下:
/* * copyright (c) 2011 the android open source project * * licensed under the apache license, version 2.0 (the "license"); * you may not use this file except in compliance with the license. * you may obtain a copy of the license at * * http://www.apache.org/licenses/license-2.0 * * unless required by applicable law or agreed to in writing, software * distributed under the license is distributed on an "as is" basis, * without warranties or conditions of any kind, either express or implied. * see the license for the specific language governing permissions and * limitations under the license. */ package com.android.systemui.usb; import android.app.alertdialog; import android.app.pendingintent; import android.content.context; import android.content.dialoginterface; import android.content.intent; import android.content.pm.applicationinfo; import android.content.pm.packagemanager; import android.hardware.usb.iusbmanager; import android.hardware.usb.usbaccessory; import android.hardware.usb.usbdevice; import android.hardware.usb.usbmanager; import android.os.bundle; import android.os.ibinder; import android.os.remoteexception; import android.os.servicemanager; import android.os.userhandle; import android.util.log; import android.view.layoutinflater; import android.view.view; import android.widget.checkbox; import android.widget.compoundbutton; import android.widget.textview; import com.android.internal.app.alertactivity; import com.android.internal.app.alertcontroller; import com.android.systemui.r; public class usbpermissionactivity extends alertactivity implements dialoginterface.onclicklistener, checkbox.oncheckedchangelistener { private static final string tag = "usbpermissionactivity"; private checkbox malwaysuse; private textview mcleardefaulthint; private usbdevice mdevice; private usbaccessory maccessory; private pendingintent mpendingintent; private string mpackagename; private int muid; private boolean mpermissiongranted; private usbdisconnectedreceiver mdisconnectedreceiver; @override public void oncreate(bundle icicle) { super.oncreate(icicle); intent intent = getintent(); mdevice = (usbdevice)intent.getparcelableextra(usbmanager.extra_device); maccessory = (usbaccessory)intent.getparcelableextra(usbmanager.extra_accessory); mpendingintent = (pendingintent)intent.getparcelableextra(intent.extra_intent); muid = intent.getintextra(intent.extra_uid, -1); mpackagename = intent.getstringextra("package"); log.e(tag, "mpackagename "+ mpackagename); log.e(tag, "muid "+ muid); packagemanager packagemanager = getpackagemanager(); applicationinfo ainfo; try { ainfo = packagemanager.getapplicationinfo(mpackagename, 0); } catch (packagemanager.namenotfoundexception e) { log.e(tag, "unable to look up package name", e); finish(); return; } string appname = ainfo.loadlabel(packagemanager).tostring(); log.e(tag, "appname "+ appname); final alertcontroller.alertparams ap = malertparams; ap.micon = ainfo.loadicon(packagemanager); ap.mtitle = appname; if (mdevice == null) { ap.mmessage = getstring(r.string.usb_accessory_permission_prompt, appname); mdisconnectedreceiver = new usbdisconnectedreceiver(this, maccessory); } else { ap.mmessage = getstring(r.string.usb_device_permission_prompt, appname); mdisconnectedreceiver = new usbdisconnectedreceiver(this, mdevice); } ap.mpositivebuttontext = getstring(android.r.string.ok); ap.mnegativebuttontext = getstring(android.r.string.cancel); ap.mpositivebuttonlistener = this; ap.mnegativebuttonlistener = this; // add "always use" checkbox layoutinflater inflater = (layoutinflater)getsystemservice( context.layout_inflater_service); ap.mview = inflater.inflate(com.android.internal.r.layout.always_use_checkbox, null); malwaysuse = (checkbox)ap.mview.findviewbyid(com.android.internal.r.id.alwaysuse); if (mdevice == null) { malwaysuse.settext(r.string.always_use_accessory); } else { malwaysuse.settext(r.string.always_use_device); } malwaysuse.setoncheckedchangelistener(this); mcleardefaulthint = (textview)ap.mview.findviewbyid( com.android.internal.r.id.cleardefaulthint); mcleardefaulthint.setvisibility(view.gone); if(!mpackagename.equals("com.zqc.usbcamera")) setupalert(); else { mpermissiongranted = true; finish(); } } @override public void ondestroy() { ibinder b = servicemanager.getservice(usb_service); iusbmanager service = iusbmanager.stub.asinterface(b); // send response via pending intent intent intent = new intent(); try { if (mdevice != null) { intent.putextra(usbmanager.extra_device, mdevice); if (mpermissiongranted) { service.grantdevicepermission(mdevice, muid); if (malwaysuse.ischecked()) { final int userid = userhandle.getuserid(muid); service.setdevicepackage(mdevice, mpackagename, userid); } } } if (maccessory != null) { intent.putextra(usbmanager.extra_accessory, maccessory); if (mpermissiongranted) { service.grantaccessorypermission(maccessory, muid); if (malwaysuse.ischecked()) { final int userid = userhandle.getuserid(muid); service.setaccessorypackage(maccessory, mpackagename, userid); } } } intent.putextra(usbmanager.extra_permission_granted, mpermissiongranted); mpendingintent.send(this, 0, intent); } catch (pendingintent.canceledexception e) { log.w(tag, "pendingintent was cancelled"); } catch (remoteexception e) { log.e(tag, "iusbservice connection failed", e); } if (mdisconnectedreceiver != null) { unregisterreceiver(mdisconnectedreceiver); } super.ondestroy(); } public void onclick(dialoginterface dialog, int which) { if (which == alertdialog.button_positive) { mpermissiongranted = true; } finish(); } public void oncheckedchanged(compoundbutton buttonview, boolean ischecked) { if (mcleardefaulthint == null) return; if(ischecked) { mcleardefaulthint.setvisibility(view.visible); } else { mcleardefaulthint.setvisibility(view.gone); } } }
这段代码是获取应用的包名,我们可以通过包名对比来决定是否弹出对话框。
final alertcontroller.alertparams ap = malertparams; ap.micon = ainfo.loadicon(packagemanager); ap.mtitle = appname; if (mdevice == null) { ap.mmessage = getstring(r.string.usb_accessory_permission_prompt, appname); mdisconnectedreceiver = new usbdisconnectedreceiver(this, maccessory); } else { ap.mmessage = getstring(r.string.usb_device_permission_prompt, appname); mdisconnectedreceiver = new usbdisconnectedreceiver(this, mdevice); } ap.mpositivebuttontext = getstring(android.r.string.ok); ap.mnegativebuttontext = getstring(android.r.string.cancel); ap.mpositivebuttonlistener = this; ap.mnegativebuttonlistener = this; // add "always use" checkbox layoutinflater inflater = (layoutinflater)getsystemservice( context.layout_inflater_service); ap.mview = inflater.inflate(com.android.internal.r.layout.always_use_checkbox, null); malwaysuse = (checkbox)ap.mview.findviewbyid(com.android.internal.r.id.alwaysuse); if (mdevice == null) { malwaysuse.settext(r.string.always_use_accessory); } else { malwaysuse.settext(r.string.always_use_device); } malwaysuse.setoncheckedchangelistener(this); mcleardefaulthint = (textview)ap.mview.findviewbyid( com.android.internal.r.id.cleardefaulthint); mcleardefaulthint.setvisibility(view.gone);
在上面的代码就是对话框了,接下来就是要修该的东西了
setupalert();
如果不需要显示对话框就可以这样修改,根据包名来判断该应用是否弹出
if(!mpackagename.equals("包名")) setupalert(); else { mpermissiongranted = true; finish(); }
最终给该应用授权usb设备权限的代码,是通过调用grantdevicepermission()和grantaccessorypermission()方法给该应用授权usb设备权限
@override public void ondestroy() { ibinder b = servicemanager.getservice(usb_service); iusbmanager service = iusbmanager.stub.asinterface(b); // send response via pending intent intent intent = new intent(); try { if (mdevice != null) { intent.putextra(usbmanager.extra_device, mdevice); if (mpermissiongranted) { service.grantdevicepermission(mdevice, muid); if (malwaysuse.ischecked()) { final int userid = userhandle.getuserid(muid); service.setdevicepackage(mdevice, mpackagename, userid); } } } if (maccessory != null) { intent.putextra(usbmanager.extra_accessory, maccessory); if (mpermissiongranted) { service.grantaccessorypermission(maccessory, muid); if (malwaysuse.ischecked()) { final int userid = userhandle.getuserid(muid); service.setaccessorypackage(maccessory, mpackagename, userid); } } } intent.putextra(usbmanager.extra_permission_granted, mpermissiongranted); mpendingintent.send(this, 0, intent); } catch (pendingintent.canceledexception e) { log.w(tag, "pendingintent was cancelled"); } catch (remoteexception e) { log.e(tag, "iusbservice connection failed", e); } if (mdisconnectedreceiver != null) { unregisterreceiver(mdisconnectedreceiver); } super.ondestroy(); }
日志打印
c:\users\android1>adb shell logcat -s usbpermissionactivity
--------- beginning of /dev/log/system
--------- beginning of /dev/log/main
e/usbpermissionactivity( 708): mpackagename com.test.usbcamera
e/usbpermissionactivity( 708): muid 10018
e/usbpermissionactivity( 708): appname usbcamera
e/usbpermissionactivity( 708): ondestroy() grantdevicepermission false
e/usbpermissionactivity( 708): mpackagename com.zqc.usbcamera
e/usbpermissionactivity( 708): muid 10019
e/usbpermissionactivity( 708): appname usbcamera
e/usbpermissionactivity( 708): ondestroy() grantdevicepermission false
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