Android11下APK调用USB serialn每次开机弹窗问题

[前言]最近客户做了一个Player，他的APK开机会调用ttyUSB0这个串口，客户想要去掉每次开机弹出权限确认的窗口，为此我在网上收集资料并找到一个较简单的方法提供给大家。

借鉴文章：解决绕过android下apk使用usb设备权限查询相应问题，自动获取usb权限_默认情况下用于该usb设备-CSDN博客

弹窗示例图片1

根据图片，我们定位到systemui里面，在系统文件中grep查找相关字眼

对话框的路径在

/android/frameworks/base/packages/SystemUI/res/values/strings.xml

通过关键词找到代码在

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

下面就是对话框的代码了

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(UsbManager.EXTRA_PACKAGE); boolean canBeDefault = intent.getBooleanExtra(UsbManager.EXTRA_CAN_BE_DEFAULT, false); 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();

下面的代码时获取应用的包名，通过包名来决定是否弹出对话框

final AlertController.AlertParams ap = mAlertParams; ap.mTitle = appName; boolean useRecordWarning = false; if (mDevice == null) { // Accessory Case ap.mMessage = getString(R.string.usb_accessory_permission_prompt, appName, mAccessory.getDescription()); mDisconnectedReceiver = new UsbDisconnectedReceiver(this, mAccessory); } else { boolean hasRecordPermission = PermissionChecker.checkPermissionForPreflight( this, android.Manifest.permission.RECORD_AUDIO, -1, aInfo.uid, mPackageName) == android.content.pm.PackageManager.PERMISSION_GRANTED; boolean isAudioCaptureDevice = mDevice.getHasAudioCapture(); useRecordWarning = isAudioCaptureDevice && !hasRecordPermission; int strID = useRecordWarning ? R.string.usb_device_permission_prompt_warn : R.string.usb_device_permission_prompt; ap.mMessage = getString(strID, appName, mDevice.getProductName()); 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; // Don't show the "always use" checkbox if the USB/Record warning is in effect if (!useRecordWarning && canBeDefault && (mDevice != null || mAccessory != null)) { // add "open when" 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(getString(R.string.always_use_accessory, appName, mAccessory.getDescription())); } else { mAlwaysUse.setText(getString(R.string.always_use_device, appName, mDevice.getProductName())); } mAlwaysUse.setOnCheckedChangeListener(this); mClearDefaultHint = (TextView)ap.mView.findViewById( com.android.internal.R.id.clearDefaultHint); mClearDefaultHint.setVisibility(View.GONE); }

下面两种方法来将讨厌的对话框去掉，做法是将应用的包名自动获取权限

1.允许所有设备获取usb权限

//setupAlert(); //允许所有设备获取usb权限 mPermissionGranted = true; finish();

2.只运行客户的apk，即包名获取usb权限，可能不止一个apk

if("com.app.signage".equals(mPackageName) || "com.app.youpackage".equals(mPackageName)) { // 包名在允许列表中 mPermissionGranted = true; finish(); } else { // 包名不在允许列表中 setupAlert(); }

或

if (!mPackageName.equals("com.app.signage") && !mPackageName.equals("com.app.youpackage")) { setupAlert(); // 不在允许列表，弹窗提示 } else { mPermissionGranted = true; // 在允许列表，直接授权 finish(); }

此方法来自下面代码的按钮点击回应函数

public void onClick(DialogInterface dialog, int which) { if (which == AlertDialog.BUTTON_POSITIVE) { mPermissionGranted = true; } finish(); }

这样，问题就解决了