Android设置系统首次开机的默认输入法

16 Jan 2015

Android OS: 4.4.4 需求：Android系统首次开机(恢复出厂状态)，读取build.prop中的属性来设置默认的输入法。

增加系统属性

ro.product.IME.default

修改InputMethodService

打开文件 frameworks/base/services/java/com/android/server/InputMethodManagerService.java

增加如下方法：

    /**
     * 0: not first boot
     * 1: first boot
     */
    static final String FIRST_BOOT_FLAG = "first_boot_flag";

    private void setCustomDefaultIME() {
        int firstBootFlag = Settings.System.getInt(
                mContext.getContentResolver(), FIRST_BOOT_FLAG, 1);
        if(DEBUG)
            Slog.d(TAG, "First Boot Flag: " + firstBootFlag);

        if (1 == firstBootFlag) {// first boot
            String defaultIme = SystemProperties.get("ro.product.IME.default", "");
            if(DEBUG)
                Slog.d(TAG, "Customer Default IME: " + defaultIme);

            if (defaultIme != null && defaultIme.length() > 0)
                mSettings.putSelectedInputMethod(defaultIme);

            // set first boot flag to 0
            Settings.System.putInt(mContext.getContentResolver(),
                    FIRST_BOOT_FLAG, 0);
        }
    }

在InputMethodManagerService()的构造方法中调用它：

        // mSettings should be created before buildInputMethodListLocked
        mSettings = new InputMethodSettings(
                mRes, context.getContentResolver(), mMethodMap, mMethodList, userId);
        mFileManager = new InputMethodFileManager(mMethodMap, userId);
        mImListManager = new InputMethodAndSubtypeListManager(context, this);

        setCustomDefaultIME();

        // Just checking if defaultImiId is empty or not
        final String defaultImiId = mSettings.getSelectedInputMethod();
        if (DEBUG) {
            Slog.d(TAG, "Initial default ime = " + defaultImiId);
        }
        mImeSelectedOnBoot = !TextUtils.isEmpty(defaultImiId);

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