Android usb設(shè)備權(quán)限查詢及自動獲取詳解流程

更新時(shí)間：2021年10月29日 11:54:58 作者：路過獨(dú)木橋！！

本篇文章介紹了我想要獲取Android系統(tǒng)usb設(shè)備使用權(quán)限時(shí)遇到的問題，以及解決該問題的過程及思路，通讀本篇對大家的學(xué)習(xí)或工作具有一定的價(jià)值，需要的朋友可以參考下

在這里插入圖片描述

看到當(dāng)上面的對話框彈出時(shí)，可以使用命令查看頂層的活動窗口

adb shell dumpsys window | findstr mCurrentFocus
mCurrentFocus=Window{41ab0ee0 u0 com.android.systemui/com.android.systemui.usb.UsbPermissionActivity}

在這里插入圖片描述

這就是應(yīng)用的位置，當(dāng)然我們也可以是用grep命令來查找這個(gè)對話框的.xml文件，進(jìn)入android源碼然后輸入命令：

grep '默認(rèn)情況下用于' ./ -Rn
./SystemUI/res/values-zh-rCN/strings.xml:51:    <string name="always_use_device" msgid="1450287437017315906">"默認(rèn)情況下用于該 USB 設(shè)備"</string>
./SystemUI/res/values-zh-rCN/strings.xml:52:    <string name="always_use_accessory" msgid="1210954576979621596">"默認(rèn)情況下用于該 USB 配件"</string>

那么這個(gè)對話框的路徑在

/android/frameworks/base/packages/SystemUI/res/values-zh-rCN/strings.xml

其相關(guān)的內(nèi)容如下：

<string name="always_use_device" msgid="1450287437017315906">"默認(rèn)情況下用于該 USB 設(shè)備"</string>

<string name="usb_device_permission_prompt" msgid="834698001271562057">"允許應(yīng)用“<xliff:g id="APPLICATION">%1$s</xliff:g>”訪問該 USB 設(shè)備嗎？"

相關(guān)應(yīng)用路徑找到.java文件來修改，其位置在:

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

這就是那個(gè)討厭的對話框?qū)?yīng)的java程序，那么來看看這個(gè)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);
        }
    }
}

這段代碼是獲取應(yīng)用的包名，我們可以通過包名對比來決定是否彈出對話框。

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);

在上面的代碼就是對話框了，接下來就是要修該的東西了

setupAlert();

如果不需要顯示對話框就可以這樣修改，根據(jù)包名來判斷該應(yīng)用是否彈出

if(!mPackageName.equals("包名"))
	setupAlert();
else {
	mPermissionGranted = true;
	finish();
}

最終給該應(yīng)用授權(quán)USB設(shè)備權(quán)限的代碼，是通過調(diào)用grantDevicePermission()和grantAccessoryPermission()方法給該應(yīng)用授權(quán)USB設(shè)備權(quán)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

到此這篇關(guān)于Android usb設(shè)備權(quán)限查詢及自動獲取詳解流程的文章就介紹到這了,更多相關(guān)Android usb設(shè)備權(quán)限內(nèi)容請搜索腳本之家以前的文章或繼續(xù)瀏覽下面的相關(guān)文章希望大家以后多多支持腳本之家！

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