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1.背景
最近有个国内的项目，预制了输入法apk，但是无法调出软键盘。原因是没有配置默认输入法，本文主要记录下如何配置默认输入法。
2.代码设置
设置默认输入法需要配置Settings.Secure.ENABLED_INPUT_METHODS和Settings.Secure.DEFAULT_INPUT_METHOD的值。
（1）添加默认属性
frameworks/base/packages/SettingsProvider/res/values/defaults.xml
<string name="enabled_input_methods" translatable="false">com.android.inputmethod.latin/.LatinIME:com.xxx.xxx/.LatinIME:com.xxx.xxx/com.xxx.xxx.LatinIME</string>
<string name="def_input_method" translatable="false">com.xxx.xxx/com.xxx.xxx.LatinIME</string>（2）加载默认属性
frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
private void loadSecureSettings(SQLiteDatabase db) {SQLiteStatement stmt = null;try {stmt = db.compileStatement("INSERT OR IGNORE INTO secure(name,value)"+ " VALUES(?,?);");......loadIntegerSetting(stmt, Settings.Secure.SLEEP_TIMEOUT,R.integer.def_sleep_timeout);//add for default methodloadStringSetting(stmt, Settings.Secure.ENABLED_INPUT_METHODS,R.string.enabled_input_methods);loadStringSetting(stmt, Settings.Secure.DEFAULT_INPUT_METHOD,R.string.def_input_method);//add for default method/** IMPORTANT: Do not add any more upgrade steps here as the global,* secure, and system settings are no longer stored in a database* but are kept in memory and persisted to XML.** See: SettingsProvider.UpgradeController#onUpgradeLocked*/} finally {if (stmt != null) stmt.close();}}PS:如果无法确认enabled_input_methods 和def_input_method的值的话，可以在设置里手动将内置的输入法apk设置成默认输入法，然后通过adb shell 命令查看当前默认输入法的对应值。
adb shell settings get secure default_input_method
adb shell settings get secure enabled_input_methodsadb shell ime list -a可以查看已安装的输入法apk的属性