Android usb设备权限查询及自动获取的示例分析

这篇文章主要介绍Android usb设备权限查询及自动获取的示例分析，文中介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

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{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:    "默认情况下用于该 USB 设备"./SystemUI/res/values-zh-rCN/strings.xml:52:    "默认情况下用于该 USB 配件"

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：

"默认情况下用于该 USB 设备""允许应用"%1$s"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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