記錄android 8設置藍牙名稱的流程。java

packages/apps/Settings/src/com/android/settings/bluetooth/BluetoothDeviceRenamePreferenceController.java

顯示更改框

@Override

public boolean handlePreferenceTreeClick(Preference preference) {

if (PREF_KEY.equals(preference.getKey())) {

mMetricsFeatureProvider.action(mContext,

MetricsProto.MetricsEvent.ACTION_BLUETOOTH_RENAME);

LocalDeviceNameDialogFragment.newInstance()

.show(mFragment.getFragmentManager(), LocalDeviceNameDialogFragment.TAG);

return true;

}

return false;

}

packages/apps/Settings/src/com/android/settings/bluetooth/LocalDeviceNameDialogFragment.java

public class LocalDeviceNameDialogFragment extends BluetoothNameDialogFragment {

public static final String TAG = "LocalAdapterName";

private LocalBluetoothAdapter mLocalAdapter;

//對話框的title, Rename this device

@Override

protected int getDialogTitle() {

return R.string.bluetooth_rename_device;

}

更改確認按鍵在父類中實現。

abstract class BluetoothNameDialogFragment extends InstrumentedDialogFragment

implements TextWatcher {

@Override

public Dialog onCreateDialog(Bundle savedInstanceState) {

String deviceName = getDeviceName();

if (savedInstanceState != null) {

deviceName = savedInstanceState.getString(KEY_NAME, deviceName);

mDeviceNameEdited = savedInstanceState.getBoolean(KEY_NAME_EDITED, false);

}

// 對話框的顯示已經操做函數。

AlertDialog.Builder builder = new AlertDialog.Builder(getActivity())

.setTitle(getDialogTitle())

.setView(createDialogView(deviceName))

.setPositiveButton(R.string.bluetooth_rename_button, (dialog, which) -> {

setDeviceName(mDeviceNameView.getText().toString().trim());

})

.setNegativeButton(android.R.string.cancel, null);

mAlertDialog = builder.create();

mAlertDialog.getWindow().setSoftInputMode(

WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);

return mAlertDialog;

}

設置名稱函數在子類中實現。

packages/apps/Settings/src/com/android/settings/bluetooth/LocalDeviceNameDialogFragment.java

protected void setDeviceName(String deviceName) {

mLocalAdapter.setName(deviceName);

}

frameworks\base\packages\SettingsLib\src\com\android\settingslib\bluetooth\LocalBluetoothAdapter.java

public void setName(String name) {

mAdapter.setName(name);

}

frameworks\base\core\java\android\bluetooth\BluetoothAdapter.java

@RequiresPermission(Manifest.permission.BLUETOOTH_ADMIN)

public boolean setName(String name) {

if (getState() != STATE_ON) return false;

try {

mServiceLock.readLock().lock();

if (mService != null) return mService.setName(name);

} catch (RemoteException e) {

Log.e(TAG, "", e);

} finally {

mServiceLock.readLock().unlock();

}

return false;

}

frameworks\base\core\java\android\bluetooth\IBluetooth.aidl

interface IBluetooth

{

boolean isEnabled();

int getState();

boolean enable();

boolean enableNoAutoConnect();

boolean disable();

String getAddress();

ParcelUuid[] getUuids();

boolean setName(in String name);

對應的服務端程序以下。

frameworks\base\services\core\java\com\android\server\BluetoothManagerService.java

case MESSAGE_BLUETOOTH_SERVICE_CONNECTED:

{

if (DBG) Slog.d(TAG,"MESSAGE_BLUETOOTH_SERVICE_CONNECTED: " + msg.arg1);

IBinder service = (IBinder) msg.obj;

try {

mBluetoothLock.writeLock().lock();

if (msg.arg1 == SERVICE_IBLUETOOTHGATT) {

mBluetoothGatt = IBluetoothGatt.Stub

.asInterface(Binder.allowBlocking(service));

onBluetoothGattServiceUp();

break;

} // else must be SERVICE_IBLUETOOTH

//Remove timeout

mHandler.removeMessages(MESSAGE_TIMEOUT_BIND);

mBinding = false;

mBluetoothBinder = service;

// 服務端和客戶端創建鏈接

mBluetooth = IBluetooth.Stub.asInterface(Binder.allowBlocking(service));

if (!isNameAndAddressSet()) {

Message getMsg = mHandler.obtainMessage(MESSAGE_GET_NAME_AND_ADDRESS);

mHandler.sendMessage(getMsg);

if (mGetNameAddressOnly) return;

}

// 客戶端程序繼承IBluetooth.Stub

packages\apps\Bluetooth\src\com\android\bluetooth\btservice\AdapterService.java

private static class AdapterServiceBinder extends IBluetooth.Stub {

private AdapterService mService;

public String getName() {

if ((Binder.getCallingUid() != Process.SYSTEM_UID) &&

(!Utils.checkCaller())) {

Log.w(TAG, "getName() - Not allowed for non-active user and non system user");

return null;

}

AdapterService service = getService();

if (service == null) return null;

return service.getName();

}

// 設置名稱

public boolean setName(String name) {

if (!Utils.checkCaller()) {

Log.w(TAG, "setName() - Not allowed for non-active user");

return false;

}

AdapterService service = getService();

if (service == null) return false;

return service.setName(name);

}

boolean setName(String name) {

enforceCallingOrSelfPermission(BLUETOOTH_ADMIN_PERM,

"Need BLUETOOTH ADMIN permission");

return mAdapterProperties.setName(name);

}

packages\apps\Bluetooth\src\com\android\bluetooth\btservice\AdapterProperties.java

boolean setName(String name) {

synchronized (mObject) {

if (name.length() > BLUETOOTH_NAME_MAX_LENGTH_BYTES)

name = name.substring(0, BLUETOOTH_NAME_MAX_LENGTH_BYTES);

return mService.setAdapterPropertyNative(

AbstractionLayer.BT_PROPERTY_BDNAME, name.getBytes());

}

}

調用JNI

packages\apps\Bluetooth\src\com\android\bluetooth\btservice\AdapterService.java

native boolean setAdapterPropertyNative(int type, byte[] val);

packages\apps\Bluetooth\jni\com_android_bluetooth_btservice_AdapterService.cpp

static jboolean setAdapterPropertyNative(JNIEnv* env, jobject obj, jint type,

jbyteArray value) {

ALOGV("%s", __func__);

if (!sBluetoothInterface) return JNI_FALSE;

jbyte* val = env->GetByteArrayElements(value, NULL);

bt_property_t prop;

prop.type = (bt_property_type_t)type;

prop.len = env->GetArrayLength(value);

prop.val = val;

int ret = sBluetoothInterface->set_adapter_property(&prop);

env->ReleaseByteArrayElements(value, val, 0);

return (ret == BT_STATUS_SUCCESS) ? JNI_TRUE : JNI_FALSE;

}

Liu Tao

2019-3-27android

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