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
Android默认输入法语言的修改以及SettingsProvider作用