Android usb设备权限查询及自动获取详解流程
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2022-03-09 19:41:08
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 mcurrentfocusmcurrentfocus=window{41a...
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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