原文地址：[http://blog.csdn.net/ouyang_peng/article/details/49815865](http://blog.csdn.net/ouyang_peng/article/details/49815865) 今天有个用户对【设置】有个特殊的要求，即： 1、开机的时候默认显示【开发者选项】并打开【USB调试】开关    （【Developer options】-->【USB debugging】） 2、开机的时候默认打开【安全】-->【未知来源】的开关    (【Security】--->【Unknown sources】) 1、首先解决【设置】界面默认显示【开发者选项】的问题 查看源代码：packages/apps/Settings/src/com/android/settings/SettingsActivity.java 在updateTilesList(List<DashboardCategory> target)方法中，可以找到【开发者选项】相关的代码： ~~~ else if (id == R.id.development_settings) { Log.d(LOG_TAG, "=================oyp K="+showDev); if (!showDev || um.hasUserRestriction( UserManager.DISALLOW_DEBUGGING_FEATURES)) { removeTile = true; } } ~~~ 其中showDev变量定义在该方法最开始处 ~~~ final boolean showDev = mDevelopmentPreferences.getBoolean(                  DevelopmentSettings.PREF_SHOW,                  android.os.Build.TYPE.equals("eng"));   ~~~ 因此要想特定客户直接显示【开发者选项】，则将showDev的值改变即可，代码如下： ~~~ //added by ouyang 2015-11-10 set DevelopmentSettings.PREF_SHOW=true if model is J5 if (android.os.SystemProperties.isJ5Version()) { SharedPreferences.Editor editor=mDevelopmentPreferences.edit(); editor.putBoolean(DevelopmentSettings.PREF_SHOW, true); editor.commit(); Log.d(LOG_TAG, "=================oyp set DevelopmentSettings.PREF_SHOW=true if model is J5 "); } //added by ouyang 2015-11-10 end final boolean showDev = mDevelopmentPreferences.getBoolean( DevelopmentSettings.PREF_SHOW, android.os.Build.TYPE.equals("eng")); ~~~ 即在初始化showDev变量之前，将DevelopmentSettings.PREF_SHOW的值设置为true，那么showDev也会是true。这样【开发者选项】就会默认打开。那个判断是J5客户的方法在/frameworks/base/core/java/android/os/SystemProperties.java中定义 ~~~ public static boolean isJ5Version(){       return SystemProperties.get("ro.product.model").contains("J5");   }   ~~~  2、解决【开发者选项】-->【USB调试】开关  首先查看packages/apps/Settings/src/com/android/settings/DevelopmentSettings.java 在updateAllOptions()方法中，有关于【USB调试】的逻辑处理。 ~~~ /// M: CR ALPS00244115. Lock and unlock screen, the "USB debugging" is unchecked. boolean isChecked = (mAdbDialog != null && mAdbDialog.isShowing()) ? true : (Settings.Global.getInt(cr, Settings.Global.ADB_ENABLED, 0) != 0); updateSwitchPreference(mEnableAdb, isChecked); /// M: update usb preference again mExt.customUSBPreference(mEnableAdb); ~~~ ~~~ void updateSwitchPreference(SwitchPreference switchPreference, boolean value) {       switchPreference.setChecked(value);       mHaveDebugSettings |= value;   }   ~~~ 其中mEnableAdb即【USB调试】开关控件。一开始我直接强制的把isChecked变量设置为true，如下代码所示 ~~~ /// M: CR ALPS00244115. Lock and unlock screen, the "USB debugging" is unchecked. boolean isChecked = (mAdbDialog != null && mAdbDialog.isShowing()) ? true : (Settings.Global.getInt(cr, Settings.Global.ADB_ENABLED, 0) != 0); - //added by ouyang 2015-11-10 set mEnableAdb=true if model is J5 - if (android.os.SystemProperties.isJ5Version()) { - isChecked=true; - } - //added by ouyang 2015-11-10 end updateSwitchPreference(mEnableAdb, isChecked); /// M: update usb preference again mExt.customUSBPreference(mEnableAdb); ~~~ 但是这样的话，直接刷机后开机的话还是不能直接连接USB调试，还要重新关闭该开关再打开该开关才能进行USB调试，因此该方案被放弃。 因为是否真正打开【USB调试】功能，是看Settings.Global.ADB_ENABLED这个属性的值是0还是1。因此真正的方法是在一个接受开机广播的广播接收者中将Settings.Global.ADB_ENABLED设置为1。 在下面和【未知来源】一起修改，在第4步骤中解决。 3、解决【安全】-->【未知来源】的开关 默认打开的问题 首先查看packages/apps/Settings/src/com/android/settings/SecuritySettings.java文件，在createPreferenceHierarchy()方法中找到【未知来源】的控件，403行附近 ~~~ mToggleAppInstallation = (SwitchPreference) findPreference(                  KEY_TOGGLE_INSTALL_APPLICATIONS);    mToggleAppInstallation.setChecked(isNonMarketAppsAllowed());  ~~~ 其中isNonMarketAppsAllowed()方法代码如下 ~~~ private boolean isNonMarketAppsAllowed() {         return Settings.Global.getInt(getContentResolver(),                                       Settings.Global.INSTALL_NON_MARKET_APPS, 0) > 0;     }   ~~~ setNonMarketAppsAllowed(boolean enabled)方法代码如下 ~~~ private void setNonMarketAppsAllowed(boolean enabled) { final UserManager um = (UserManager) getActivity().getSystemService(Context.USER_SERVICE); if (um.hasUserRestriction(UserManager.DISALLOW_INSTALL_UNKNOWN_SOURCES)) { return; } // Change the system setting Settings.Global.putInt(getContentResolver(), Settings.Global.INSTALL_NON_MARKET_APPS, enabled ? 1 : 0); } ~~~ 一开始我在判断isNonMarketAppsAllowed()方法之前，先调用setNonMarketAppsAllowed()方法，这样一进入这个界面的话，【未知来源】选项是被勾选的。 ~~~ mToggleAppInstallation = (SwitchPreference) findPreference( KEY_TOGGLE_INSTALL_APPLICATIONS); - - //added by ouyang 2015-11-10 setChecked(true) if the model is J5 - if (android.os.SystemProperties.isJ5Version()) { - setNonMarketAppsAllowed(true); - } mToggleAppInstallation.setChecked(isNonMarketAppsAllowed()); - //added by ouyang 2015-11-10 end ~~~ 但是，刷完机直接安装一个第三方的apk的话，还是会弹出窗口要我设置【未知来源】选项，如下所示，因此该方案被放弃。  点击【设置】按钮进入到界面是，【未知来源】按钮默认勾选了，这个时候退出去，继续安装apk的话就可以安装了，如下所示：  因为这个添加的代码是在SecuritySettings的createPreferenceHierarchy()方法中，也就是说要进入到该Activity才生效。这样明显没达到目的。 因此要和设置【USB调试】一样，在一个接收开机广播的广播接收者中将Settings.Global.INSTALL_NON_MARKET_APPS设置为1。 4、找Settings里面定义的一个接收开机广播的广播接收者，在AndroidManifest.xml中找到一个，当然你也可以自己定义一个这样的广播接收者。 ~~~ <!-- Restore Rotation Receiver --> <receiver android:name="com.mediatek.settings.RestoreRotationReceiver"> <intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED" /> <action android:name="android.intent.action.ACTION_BOOT_IPO" /> </intent-filter> </receiver> ~~~ 因此在packages/apps/Settings/src/com/mediatek/settings/RestoreRotationReceiver.java的onReceive(Context context, Intent intent)方法中加入以下代码： ~~~ //added by ouyang 2015-11-13 if (android.os.SystemProperties.isJ5Version()) { // 开机启动时，默认设置 [未知来源] 勾选 Settings.Global.putInt(context.getContentResolver(), Settings.Global.INSTALL_NON_MARKET_APPS,1); // 开机启动时，默认设置 [USB调试] 勾选 Settings.Global.putInt(context.getContentResolver(),Settings.Global.ADB_ENABLED, 1); } //added by ouyang 2015-11-13 end ~~~ 而一开始添加的代码可以注释掉了。通过git diff可以看出来 ~~~ diff --git a/packages/apps/Settings/src/com/android/settings/DevelopmentSettings.java b/packages/apps/Settings/src/com/android/settings/Devel index 0a987df..503270a 100755 --- a/packages/apps/Settings/src/com/android/settings/DevelopmentSettings.java +++ b/packages/apps/Settings/src/com/android/settings/DevelopmentSettings.java @@ -508,15 +508,9 @@ public class DevelopmentSettings extends SettingsPreferenceFragment final Context context = getActivity(); final ContentResolver cr = context.getContentResolver(); mHaveDebugSettings = false; - /// M: CR ALPS00244115. Lock and unlock screen, the "USB debugging" is unchecked. boolean isChecked = (mAdbDialog != null && mAdbDialog.isShowing()) ? true : (Settings.Global.getInt(cr, Settings.Global.ADB_ENABLED, 0) != 0); - //added by ouyang 2015-11-10 set mEnableAdb=true if model is J5 - if (android.os.SystemProperties.isJ5Version()) { - isChecked=true; - } - //added by ouyang 2015-11-10 end updateSwitchPreference(mEnableAdb, isChecked); /// M: update usb preference again mExt.customUSBPreference(mEnableAdb); ~~~ ~~~ diff --git a/packages/apps/Settings/src/com/android/settings/SecuritySettings.java b/packages/apps/Settings/src/com/android/settings/Security index 4de173a..392e6ee 100755 --- a/packages/apps/Settings/src/com/android/settings/SecuritySettings.java +++ b/packages/apps/Settings/src/com/android/settings/SecuritySettings.java @@ -402,14 +402,7 @@ public class SecuritySettings extends SettingsPreferenceFragment root.findPreference(KEY_DEVICE_ADMIN_CATEGORY); mToggleAppInstallation = (SwitchPreference) findPreference( KEY_TOGGLE_INSTALL_APPLICATIONS); - - //added by ouyang 2015-11-10 setChecked(true) if the model is J5 - if (android.os.SystemProperties.isJ5Version()) { - setNonMarketAppsAllowed(true); - } mToggleAppInstallation.setChecked(isNonMarketAppsAllowed()); - //added by ouyang 2015-11-10 end - // Side loading of apps. // Disable for restricted profiles. For others, check if policy disallows it. mToggleAppInstallation.setEnabled(!um.getUserInfo(UserHandle.myUserId()).isRestricted()); ~~~ 这样改为后，编译，刷机后，插上USB数据线就可以开始进行adb调试了，而且可以直接安装未知来源的apk了。