Android源码中默认的有三种输入法：英文，中文，日文。对应的工程代码路径为： <android_root>/packages/inputmethods/LatinIME/ <android_root>/packages/inputmethods/OpenWnn/ <android_root>/packages/inputmethods/PinyinIME/
一般情况下，默认都是选择的LatinIME输入法，但是Android系统默认都是选择系统语言作为输入法，比如我们要用中文输入法， 就需要切换系统语言为中文，或不勾选系统语言，主动勾选中文，但是我们怎么修改默认的语言输入法呢？ 主要要关注3个模块代码: (1) Setting源码 (2) SettingsProvider源码 (3) LatinIME输入法源码
方法一:(修改默认输入法语言为英文和泰文,亲测ok) (1) 修改 packages\inputmethods\LatinIME\java\AndroidManifest.xml,增加
<uses-permission android:name="android.permission.WRITE_SETTINGS" /> <uses-permission android:name="android.permission.WRITE_SECURE_SETTINGS" /> <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" /> <receiver android:name="LatinImeReceiver" android:enabled="true"> <intent-filter> <action android:name="android.intent.action.BOOT_COMPLETED" /> </intent-filter> </receiver>
(2) 在packages\inputmethods\LatinIME\java\src\com\android\inputmethod\latin目录增加LatinImeReceiver.java文件，源码如下
package com.android.inputmethod.latin; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.content.SharedPreferences; import android.provider.Settings; import android.util.Log; import android.view.inputmethod.InputMethodInfo; import android.view.inputmethod.InputMethodManager; import android.view.inputmethod.InputMethodSubtype; import android.text.TextUtils; import android.content.SharedPreferences.Editor; import android.preference.PreferenceManager; public class LatinImeReceiver extends BroadcastReceiver { private static final String TAG = LatinImeReceiver.class.getSimpleName(); private static final String[] DEFAULT_LATIN_IME_LANGUAGES = {"en_US","th"};//默认开启输入法的语言 @Override public void onReceive(Context context, Intent intent) { // Set the default input language at the system boot completed. if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) { Log.i(TAG,"onReceive:ACTION_BOOT_COMPLETED"); SharedPreferences sp = context.getSharedPreferences("default_input_language_config", Context.MODE_PRIVATE); boolean hasSet = sp.getBoolean("has_set", false); if (!hasSet) { setDefaultSubtypes(context); sp.edit().putBoolean("has_set", true).commit(); } } } /** * M: Set the default IME subtype. */ private void setDefaultSubtypes(Context context) { Log.i(TAG,"setDefaultSubtypes"); final String serviceName = "com.android.inputmethod.latin/.LatinIME"; final String currentPackageName = "com.android.inputmethod.latin"; final String enable = Settings.Secure.getString(context.getContentResolver(), Settings.Secure.ENABLED_INPUT_METHODS); Log.i(TAG,"enable="+enable);//com.android.inputmethod.latin/.LatinIME final InputMethodManager imm = (InputMethodManager) context.getSystemService( Context.INPUT_METHOD_SERVICE); final StringBuilder builder = new StringBuilder(); // Get sub type hash code for (InputMethodInfo info : imm.getInputMethodList()) { if (currentPackageName.equals(info.getPackageName())) { Log.i(TAG,"info.getSubtypeCount()="+info.getSubtypeCount());//55 for (int i = 0; i < info.getSubtypeCount(); i++) { final InputMethodSubtype subtype = info.getSubtypeAt(i); final String locale = subtype.getLocale().toString(); Log.i(TAG,"locale="+locale); if (isDefaultLocale(locale)) { Log.i(TAG, "default enabled subtype locale = " + locale); builder.append(';'); builder.append(subtype.hashCode()); } } break; } } // Insert the sub type if (builder.length() > 0 && !TextUtils.isEmpty(enable)) { final String subtype = builder.toString(); builder.setLength(0); final int index = enable.indexOf(serviceName) + serviceName.length(); if (enable.length() > index) { builder.append(enable.substring(0, index)); builder.append(subtype); builder.append(enable.substring(index)); } else if (enable.length() == index) { builder.append(enable); builder.append(subtype); } else { return; } } else { Log.w(TAG, "Build Latin IME subtype failed: " + " builder length = " + builder.length() + "; enable isEmpty :" + TextUtils.isEmpty(enable)); return; } /*android/packages/inputmethods/LatinIME/java/res/xml/method.xml -921088104;529847764分别代表en_US和th */ Log.i(TAG,"commoit:"+builder.toString());//com.android.inputmethod.latin/.LatinIME;-921088104;529847764 // Commit the result android.provider.Settings.Secure.putString(context.getContentResolver(), android.provider.Settings.Secure.ENABLED_INPUT_METHODS, builder.toString()); String lastInputMethodId = Settings.Secure.getString(context.getContentResolver(), Settings.Secure.DEFAULT_INPUT_METHOD); Log.w(TAG, "DEFAULT_INPUT_METHOD = " + lastInputMethodId); //com.android.inputmethod.latin/.LatinIME if(lastInputMethodId.equals(serviceName)) { Log.w(TAG, "DEFAULT_INPUT_METHOD = com.android.inputmethod.latin/.LatinIME" ); for (InputMethodInfo info : imm.getInputMethodList()) { if (currentPackageName.equals(info.getPackageName())) { for (int i = 0; i < info.getSubtypeCount(); i++) { final InputMethodSubtype subtype = info.getSubtypeAt(i); final String[] locales = DEFAULT_LATIN_IME_LANGUAGES; Log.w(TAG, "i = " + i + ", locales[0] = " + locales[0]); if((subtype.getLocale()).equals(locales[0])) { Log.w(TAG, "putString " + subtype.hashCode()); android.provider.Settings.Secure.putInt(context.getContentResolver(), android.provider.Settings.Secure.SELECTED_INPUT_METHOD_SUBTYPE, subtype.hashCode()); } } } } } } /** * M: Check if the current locale is default or not. */ private boolean isDefaultLocale (String locale) { final String[] locales = DEFAULT_LATIN_IME_LANGUAGES; for (String s : locales) { if (s.equals(locale)) { return true; } } return false; } }
方法二: 还有一种修改方案:(在amlogic验证是OK的) (1) 首先frameworks\base\packages\SettingsProvider\res\values\defaults.xml 增加下面语句 <string name="def_input_methods">com.android.inputmethod.latin/.LatinIME;529847764;-921088104</string>
意思是增加英文和泰文输入法,android/packages/inputmethods/LatinIME/java/res/xml/method.xml中有定义的 -921088104;529847764分别代表en_US和th
(2) 然后在frameworks\base\packages\SettingsProvider\src\com\android\providers\settings\DatabaseHelper.java 增加如下代码 loadStringSetting(stmt, Settings.Secure.ENABLED_INPUT_METHODS, R.string.def_input_methods);
frameworks/base/packages/SettingsProvider的作用 我们在调用android.provider.Settings修改一些设置时，Settings会调用真正的SettingsProvider去访问数据库。 android把SettingsProvider的代码放在了frameworks/base/packages下面。
Android framework系统默认设置修改 修改Settings源码可修改系统设置项，Settings数据被存放于com.android.providers.settings/databases/settings.db 中，如果想修改系统启动后加载的默认值，一种方法是直接修改settings.db的值，另一种就是修改SettingsProvider默认值 Settings应用能够配置Android系统的各种设置，这些设置的默认值都是由frameworks中的SettingsProvider从数据库中读取的， 那么第一次开机的时候这些数据都是从哪儿来的呢？ frameworks/base/packages/SettingsProvider/res/values/defaults.xml这个文件就是用来存储Android系统的默认设置 如果想定义defaults.xml中没有的，在这里添加后，需修改frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java，加入自己的存储代码。 例如： 600000设置关屏超时时间的默认值 102 设置亮度的默认值 false设置是否允许安装非Market应用程序的默认值
参考: Android的语言设置（一） http://blog.csdn.net/seker_xinjian/article/details/6288957
Latin输入法怎么默认勾选几种语言 http://wenku.baidu.com/link?url=gAscqnKoMNOi_wzR3LEsk9kw-Hsp6k-hkWsW3_Jvyz3SmMXkENODD6XjRtS9BrndAS4iY2IuM8nQaxj05J4NUmBFdFE5-7nl9P9bVIwqfCm
Android framework系统默认设置修改 http://blog.csdn.net/tiantian715/article/details/7739294
在android settings.db数据库中添加一项新的设置 http://www.2cto.com/kf/201303/198067.html
