Android 各版本设置 USB 默认连接 MTP 模式 ( Android 6.0+ )

Android 6.0 以及之后的版本，google默认设计直接配置USB连接模式为：仅充电；

项目开发需要配置USB的默认连接方式为：MTP 模式；

废话不多说，直接给方案，不同平台源码有少许差异，请知悉！

Android 6.0 Before

modify /device/mediatek/common/device.mk

# default usb function ifeq ($(strip $(MTK_MASS_STORAGE)),yes)
ADDITIONAL_DEFAULT_PROPERTIES += persist.sys.usb.config=mass_storage
//修改上面成想要的功能，如 ADDITIONAL_DEFAULT_PROPERTIES += persist.sys.usb.config=mtp

Android 6.0 +

modify frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java。

public class UsbDeviceManager {···省略很多代码···private boolean mConfigured;//modified in 2017-05-22 start//解锁数据，连接电脑，就能看到默认连接模式为MTPprivate boolean mUsbDataUnlocked = true;//modified in 2017-05-22 endprivate String mCurrentFunctions;private String mDefaultFunctions;······@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case MSG_UPDATE_STATE:mConnected = (msg.arg1 == 1);mConfigured = (msg.arg2 == 1);mUsbConfigured = mConfigured;if (!mConnected) {//modified in 2017-05-22 start//default usb connect mode as mtp// When a disconnect occurs, relock access to sensitive user data//断开连接的时候，保持当前连接模式，下次连接的时候还是MTPmUsbDataUnlocked = true;//modified in 2017-05-22 end}updateUsbNotification();updateAdbNotification();if (UsbManager.containsFunction(mCurrentFunctions,UsbManager.USB_FUNCTION_ACCESSORY)) {updateCurrentAccessory();} else if (!mConnected) {//modified  in 2017-05-22 start//change default usb connect mode as mtp,do not restore// 这里不恢复默认连接方式，保持保持当前的连接模式setEnabledFunctions(null, true);//modified  in 2017-05-22 end}if (mBootCompleted) {updateUsbStateBroadcastIfNeeded();updateUsbFunctions();}······}

Android 7 +

Modify

1.修改frameworks/base/services/usb/java/com/android/server/usb/UsbService.java

public class UsbService extends IUsbManager.Stub {······final IntentFilter filter = new IntentFilter();filter.setPriority(IntentFilter.SYSTEM_HIGH_PRIORITY);filter.addAction(Intent.ACTION_USER_SWITCHED);filter.addAction(Intent.ACTION_USER_STOPPED);//add by xx in 2017-06-12 for bug 169853 start//注册三个广播filter.addAction(Intent.ACTION_USER_PRESENT);filter.addAction(Intent.ACTION_SCREEN_OFF);filter.addAction(Intent.ACTION_SCREEN_ON);//add by xx in 2017-06-12 for bug 169853 endfilter.addAction(DevicePolicyManager.ACTION_DEVICE_POLICY_MANAGER_STATE_CHANGED);mContext.registerReceiver(mReceiver, filter, null, null);······private BroadcastReceiver mReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {final int userId = intent.getIntExtra(Intent.EXTRA_USER_HANDLE, -1);final String action = intent.getAction();if (Intent.ACTION_USER_SWITCHED.equals(action)) {setCurrentUser(userId);} else if (Intent.ACTION_USER_STOPPED.equals(action)) {synchronized (mLock) {mSettingsByUser.remove(userId);}} else if (DevicePolicyManager.ACTION_DEVICE_POLICY_MANAGER_STATE_CHANGED.equals(action)) {if (mDeviceManager != null) {mDeviceManager.updateUserRestrictions();}//add by xx in 2017-06-12 for bug 169853 start//处理三个广播}else if (Intent.ACTION_USER_PRESENT.equals(action)) {if (mDeviceManager != null) {mDeviceManager.usbDataUnlocked(true);//这个方法系统有的mDeviceManager.setUserPresent();//这个方法是添加的}} else if (Intent.ACTION_SCREEN_OFF.equals(action)) {if (mDeviceManager != null) {mDeviceManager.updateScreentSate(true);//这个方法是添加的，为了更新屏幕状态}} else if (Intent.ACTION_SCREEN_ON.equals(action)) {if (mDeviceManager != null) {mDeviceManager.updateScreentSate(false);//这个方法是添加的，为了更新屏幕状态}//add by xx in 2017-06-12 for bug 169853 end}}};
}

2.接下来修改frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java

public class UsbDeviceManager {·····//添加两个全局变量，作为标识//modified by xx in 2017-06-12 for bug 169853 startprivate boolean mUserPresent = false;//用户是否结果到前台private boolean screenOff = false;//屏幕是否是熄屏private boolean changeByUser = false;//切换USB模式的时候，是这里代码切换的，还是用户点击切换的。//modified by xx in 2017-06-12 for bug 169853 end·····//添加这两个方法，在UsbService.java中用到，更新这边的状态//modified by xx in 2017-06-12 for bug 169853 startpublic void setUserPresent(){mUserPresent = true;}public void updateScreentSate(boolean state){screenOff = state;if(!screenOff) {mUserPresent = false;}if(mHandler != null){mHandler.updateUsbMode();}}public void usbDataUnlocked(){changeByUser  = false;mHandler.sendMessage(MSG_SET_USB_DATA_UNLOCKED, true);}//modified by xx in 2017-06-12 for bug 169853 end·····//更新USB连接状态public void updateState(String state) {int connected, configured;if ("HWDISCONNECTED".equals(state)) {connected = 0;configured = 0;mHwDisconnected = true;//add by xx in 2017-08-03 for swtich usb mode startchangeByUser = false;//add by xx in 2017-08-03 for swtich usb mode end} else if ("DISCONNECTED".equals(state)) {connected = 0;configured = 0;mHwDisconnected = false;//modified by xx in 2017-06-12 for bug 169853 start//当熄屏的情况下，更新用户不在前台的标识if(screenOff){mUserPresent = false;}//modified by xxx in 2017-06-12 for bug 169853 end} else if ("CONNECTED".equals(state)) {connected = 1;configured = 0;·····private final class UsbHandler extends Handler { ·····//在收到更新USB状态的消息之后，更新USB模式，当然要根据用户是否在前台进行判断@Overridepublic void handleMessage(Message msg) {switch (msg.what) {case MSG_UPDATE_STATE:mConnected = (msg.arg1 == 1);mConfigured = (msg.arg2 == 1);mUsbConfigured = mConfigured;//modified by xx in 2017-06-12 for bug 169853 start//update usb state firstupdateUsbMode();if (mUserPresent && !changeByUser) {   //用户在前台的mUsbDataUnlocked = true;//解锁数据，那么连接电脑就能看到连接模式为MTP了}//modified by xx in 2017-06-12 for bug 169853 endif (!mConnected) {// When a disconnect occurs, relock access to sensitive user datamUsbDataUnlocked = false;}updateUsbNotification();updateAdbNotification();if (UsbManager.containsFunction(mCurrentFunctions,UsbManager.USB_FUNCTION_ACCESSORY)) {updateCurrentAccessory();} else if (!mConnected) {}·····//省略代码case MSG_SET_USB_DATA_UNLOCKED://add by xx in 2017-08-03 for swtich usb mode startif(!changeByUser && mUsbDataUnlocked) return;//add by xx in 2017-08-03 for swtich usb mode endsetUsbDataUnlocked(msg.arg1 == 1);break;}·····//在UsbHandler类中的方法，主要是因为用到USB状态值：mConnected//add by xx in 2017-06-12 for bug 169853 startprivate void updateUsbMode(){if(!mConnected && screenOff){mUserPresent = false;}}//add by xx in 2017-06-12 for bug 169853 end}·····}//省略其他代码public void setCurrentFunctions(String functions) {if (DEBUG) Slog.d(TAG, "setCurrentFunctions(" + functions + ")");//add by xx in 2017-08-03 for swtich usb mode startchangeByUser = true;//add by xx in 2017-08-03 for swtich usb mode endmHandler.sendMessage(MSG_SET_CURRENT_FUNCTIONS, functions);}//省略其他代码
}

Android 8.0 +

modify /frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java

@Overridepublic void handleMessage(Message msg) {...case MSG_UPDATE_STATE:...if (!mConnected) {// restore defaults when USB is disconnectedsetEnabledFunctions(null, !mAdbEnabled, false);                         setEnabledFunctions(UsbManager.USB_FUNCTION_MTP, false, true); //chc add}...             case MSG_BOOT_COMPLETED:mBootCompleted = true;if (mPendingBootBroadcast) {updateUsbStateBroadcastIfNeeded(false);mPendingBootBroadcast = false;}//setEnabledFunctions(null, false, false);setEnabledFunctions(UsbManager.USB_FUNCTION_MTP, false, true); //chc addif (mCurrentAccessory != null) {getCurrentSettings().accessoryAttached(mCurrentAccessory);}if (mDebuggingManager != null) {mDebuggingManager.setAdbEnabled(mAdbEnabled);}break;}

连接电脑，看电脑上MTP的图标显示之后，然后将延迟进行相应的调整

Android 9.0

modify

--- a/frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java
+++ b/frameworks/base/services/usb/java/com/android/server/usb/UsbDeviceManager.java
@@ -824,7 +824,7 @@ public class UsbDeviceManager implements ActivityManagerInternal.ScreenObserver&& mScreenUnlockedFunctions != UsbManager.FUNCTION_NONE) {setScreenUnlockedFunctions();} else {
-                                setEnabledFunctions(UsbManager.FUNCTION_NONE, false);
+                                setEnabledFunctions(UsbManager.FUNCTION_MTP, false);}}updateUsbFunctions();
@@ -1012,7 +1012,9 @@ public class UsbDeviceManager implements ActivityManagerInternal.ScreenObserver&& mScreenUnlockedFunctions != UsbManager.FUNCTION_NONE) {setScreenUnlockedFunctions();} else {
-                    setEnabledFunctions(UsbManager.FUNCTION_NONE, false);
+                   Slog.e(TAG, "finishBoot");
+                    //setEnabledFunctions(UsbManager.FUNCTION_NONE, false);
+                   setEnabledFunctions(UsbManager.FUNCTION_MTP, false);}if (mCurrentAccessory != null) {mUsbDeviceManager.getCurrentSettings().accessoryAttached(mCurrentAccessory);

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