原文地址：[http://blog.csdn.net/ouyang_peng/article/details/49815865](http://blog.csdn.net/ouyang_peng/article/details/49815865) 今天有個用戶對【設置】有個特殊的要求，即： 1、開機的時候默認顯示【開發者選項】并打開【USB調試】開關??? （【Developer options】-->【USB debugging】） 2、開機的時候默認打開【安全】-->【未知來源】的開關??? (【Security】--->【Unknown sources】) 1、首先解決【設置】界面默認顯示【開發者選項】的問題 查看源代碼：packages/apps/Settings/src/com/android/settings/SettingsActivity.java 在updateTilesList(List<DashboardCategory> target)方法中，可以找到【開發者選項】相關的代碼： ~~~ 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變量定義在該方法最開始處 ~~~ final?boolean?showDev?=?mDevelopmentPreferences.getBoolean(?? ???????????????DevelopmentSettings.PREF_SHOW,?? ???????????????android.os.Build.TYPE.equals("eng"));?? ~~~ 因此要想特定客戶直接顯示【開發者選項】，則將showDev的值改變即可，代碼如下： ~~~ //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變量之前，將DevelopmentSettings.PREF_SHOW的值設置為true，那么showDev也會是true。這樣【開發者選項】就會默認打開。那個判斷是J5客戶的方法在/frameworks/base/core/java/android/os/SystemProperties.java中定義 ~~~ public?static?boolean?isJ5Version(){?? ????return?SystemProperties.get("ro.product.model").contains("J5");?? }?? ~~~  2、解決【開發者選項】-->【USB調試】開關? 首先查看packages/apps/Settings/src/com/android/settings/DevelopmentSettings.java 在updateAllOptions()方法中，有關于【USB調試】的邏輯處理。 ~~~ /// 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調試】開關控件。一開始我直接強制的把isChecked變量設置為true，如下代碼所示 ~~~ /// 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); ~~~ 但是這樣的話，直接刷機后開機的話還是不能直接連接USB調試，還要重新關閉該開關再打開該開關才能進行USB調試，因此該方案被放棄。 因為是否真正打開【USB調試】功能，是看Settings.Global.ADB_ENABLED這個屬性的值是0還是1。因此真正的方法是在一個接受開機廣播的廣播接收者中將Settings.Global.ADB_ENABLED設置為1。 在下面和【未知來源】一起修改，在第4步驟中解決。 3、解決【安全】-->【未知來源】的開關 默認打開的問題 首先查看packages/apps/Settings/src/com/android/settings/SecuritySettings.java文件，在createPreferenceHierarchy()方法中找到【未知來源】的控件，403行附近 ~~~ mToggleAppInstallation?=?(SwitchPreference)?findPreference(?? ???????????????KEY_TOGGLE_INSTALL_APPLICATIONS);?? ?mToggleAppInstallation.setChecked(isNonMarketAppsAllowed());? ~~~ 其中isNonMarketAppsAllowed()方法代碼如下 ~~~ private?boolean?isNonMarketAppsAllowed()?{?? ??????return?Settings.Global.getInt(getContentResolver(),?? ????????????????????????????????????Settings.Global.INSTALL_NON_MARKET_APPS,?0)?>?0;?? ??}?? ~~~ setNonMarketAppsAllowed(boolean enabled)方法代碼如下 ~~~ 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); } ~~~ 一開始我在判斷isNonMarketAppsAllowed()方法之前，先調用setNonMarketAppsAllowed()方法，這樣一進入這個界面的話，【未知來源】選項是被勾選的。 ~~~ 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，刷完機直接安裝一個第三方的apk的話，還是會彈出窗口要我設置【未知來源】選項，如下所示，因此該方案被放棄。  點擊【設置】按鈕進入到界面是，【未知來源】按鈕默認勾選了，這個時候退出去，繼續安裝apk的話就可以安裝了，如下所示：  因為這個添加的代碼是在SecuritySettings的createPreferenceHierarchy()方法中，也就是說要進入到該Activity才生效。這樣明顯沒達到目的。 因此要和設置【USB調試】一樣，在一個接收開機廣播的廣播接收者中將Settings.Global.INSTALL_NON_MARKET_APPS設置為1。 4、找Settings里面定義的一個接收開機廣播的廣播接收者，在AndroidManifest.xml中找到一個，當然你也可以自己定義一個這樣的廣播接收者。 ~~~ <!-- 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)方法中加入以下代碼： ~~~ //added by ouyang 2015-11-13 if (android.os.SystemProperties.isJ5Version()) { // 開機啟動時，默認設置 [未知來源] 勾選 Settings.Global.putInt(context.getContentResolver(), Settings.Global.INSTALL_NON_MARKET_APPS,1); // 開機啟動時，默認設置 [USB調試] 勾選 Settings.Global.putInt(context.getContentResolver(),Settings.Global.ADB_ENABLED, 1); } //added by ouyang 2015-11-13 end ~~~ 而一開始添加的代碼可以注釋掉了。通過git diff可以看出來 ~~~ 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()); ~~~ 這樣改為后，編譯，刷機后，插上USB數據線就可以開始進行adb調試了，而且可以直接安裝未知來源的apk了。