如何在Android6.0 设置默认输入法

Android6.0设置默认输入法，这里以日文输入法为例，

1.在frameworks/base/packages/SettingsProvider/res/values/defaults.xml 添加：

jp.co.omronsoft.openwnn/.OpenWnnJAJP

2.在frameworks/base/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java添加：

loadStringSetting(stmt, Settings.Secure.DEFAULT_INPUT_METHOD,R.string.def_input_method );

这个方法加在private void loadSecureSettings(SQLiteDatabase db)这个里面。

3.使能所有输入法，frameworks/base/core/java/com/android/internal/inputmethod/InputMethodUtils.java

--- a/frameworks/base/core/java/com/android/internal/inputmethod/InputMethodUtils.java
+++ b/frameworks/base/core/java/com/android/internal/inputmethod/InputMethodUtils.java
@@ -926,7 +926,7 @@ public class InputMethodUtils {
         // At the initial boot, the settings for input methods are not set,
         // so we need to enable IME in that case.
         public void enableAllIMEsIfThereIsNoEnabledIME() {
-            if (TextUtils.isEmpty(getEnabledInputMethodsStr())) {
+            if (!TextUtils.isEmpty(getEnabledInputMethodsStr())) {
                 StringBuilder sb = new StringBuilder();
                 final int N = mMethodList.size();
                 for (int i = 0; i < N; i++) {

这里的jp.co.omronsoft.openwnn/.OpenWnnJAJP是输入法ID，每个输入法都有自己的ID，如果不知道输入法ID，可以通过下面的打印方法获取：

frameworks/base/services/core/java/com/android/server/InputMethodManagerService.java

 void buildInputMethodListLocked(ArrayListlist,
            HashMapmap, boolean resetDefaultEnabledIme) {
        if (DEBUG) {
            Slog.d(TAG, "--- re-buildInputMethodList reset = " + resetDefaultEnabledIme
                    + " n ------ n" + InputMethodUtils.getStackTrace());
        }
        list.clear();
        map.clear();

        // Use for queryIntentServicesAsUser
        final PackageManager pm = mContext.getPackageManager();
        String disabledSysImes = mSettings.getDisabledSystemInputMethods();
        if (disabledSysImes == null) disabledSysImes = "";

        final Listservices = pm.queryIntentServicesAsUser(
                new Intent(InputMethod.SERVICE_INTERFACE),
                PackageManager.GET_META_DATA | PackageManager.GET_DISABLED_UNTIL_USED_COMPONENTS,
                mSettings.getCurrentUserId());

        final HashMap<String, List> additionalSubtypes =
                mFileManager.getAllAdditionalInputMethodSubtypes();
        for (int i = 0; i < services.size(); ++i) {
            ResolveInfo ri = services.get(i);
            ServiceInfo si = ri.serviceInfo;
            ComponentName compName = new ComponentName(si.packageName, si.name);
            if (!android.Manifest.permission.BIND_INPUT_METHOD.equals(
                    si.permission)) {
                Slog.w(TAG, "Skipping input method " + compName
                        + ": it does not require the permission "
                        + android.Manifest.permission.BIND_INPUT_METHOD);
                continue;
            }

            if (DEBUG) Slog.d(TAG, "Checking " + compName);
			//打印添加在这里，打印所有输入法的ID
            Slog.d(TAG, "Checking packageName:" + si.packageName + "  name:" + si.name);

            try {
                InputMethodInfo p = new InputMethodInfo(mContext, ri, additionalSubtypes);
                list.add(p);
                final String id = p.getId();
                map.put(id, p);

                if (DEBUG) {
                    Slog.d(TAG, "Found an input method " + p);
                }

重新编译，烧录测试ok。