[移动开发]Android 10 添加第三方输入法为系统默认输入法

由于Android10 在SettingsProviderres应用中找不到默认定义的变量enabled_input_methods，所以我们需要自己重新自定义一下
代码路径：
android/frameworks/base/packages/SettingsProviderres/values/defaults.xml
android/frameworks/base/packages/SettingsProvidersrc/com/android/providers/settings/DatabaseHelper.java
1、在defaults.xml资源文件中添加输入法包名

<string name="sogou_input_method">com.sohu.inputmethod.sogou/.SogouIME</string>
<string name="enable_sogou_input_method">com.sohu.inputmethod.sogou/.SogouIME:com.android.inputmethod.latin/.LatinIME</string>

2、在DatabaseHelper.java中loadSecureSettings()方法中

	private static final String INPUT_METHOD = SystemProperties.get("persist.sys.input_method","sogou");
 if (INPUT_METHOD.equals("sogou")) {
				loadStringSetting(stmt, Settings.Secure.ENABLED_INPUT_METHODS, R.string.enable_sogou_input_method);
				loadStringSetting(stmt, Settings.Secure.DEFAULT_INPUT_METHOD, R.string.sogou_input_method);
			}else {
				 loadStringSetting(stmt, Settings.Secure.ENABLED_INPUT_METHODS,
                    R.string.enabled_input_methods);
				loadStringSetting(stmt, Settings.Secure.DEFAULT_INPUT_METHOD,
                    R.string.default_input_method);
			}