Android系统移植与调试之------->如何修改Android系统默认显示【开发者选项】并默认打开【USB调试】和【未知来源】开关

              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。

====================================================================================

  作者：欧阳鹏  欢迎转载，与人分享是进步的源泉！

  转载请保留原文地址：http://blog.csdn.net/ouyang_peng

====================================================================================