长按Home键不做任何功能处理

在Android中一般按Home键是回到主界面，有时候客户需要特殊需求，这时候需要进行额外处理。想要完全监听Home键需要结合源码修改。

需要修改的源码及其路径：frameworks/base/services/core/java/com/android/server/policy/PhoneWindowManager.java

1、通过源码我们可以发现，通过下面几个常量来控制，这些常量与config.xml文件相对应：

 // These need to match the documentation/constant in
    // core/res/res/values/config.xml
    static final int LONG_PRESS_HOME_NOTHING = 0;
    static final int LONG_PRESS_HOME_ALL_APPS = 1;
    static final int LONG_PRESS_HOME_ASSIST = 2;
    static final int LAST_LONG_PRESS_HOME_BEHAVIOR = LONG_PRESS_HOME_ASSIST;

2、之后是通过readConfigurationDependentBehaviors()方法读取xml中定义的常量。我们也是在这修改所获取的值来达到修改长按Home键的目的。以下是代码：

    /**
     * Read values from config.xml that may be overridden depending on
     * the configuration of the device.
     * eg. Disable long press on home goes to recents on sw600dp.
     */
    private void readConfigurationDependentBehaviors() {
        final Resources res = mContext.getResources();

        mLongPressOnHomeBehavior = res.getInteger(
                com.android.internal.R.integer.config_longPressOnHomeBehavior);
        if (mLongPressOnHomeBehavior < LONG_PRESS_HOME_NOTHING ||
                mLongPressOnHomeBehavior > LAST_LONG_PRESS_HOME_BEHAVIOR) {
            mLongPressOnHomeBehavior = LONG_PRESS_HOME_NOTHING;
        }

        mDoubleTapOnHomeBehavior = res.getInteger(
                com.android.internal.R.integer.config_doubleTapOnHomeBehavior);
        if (mDoubleTapOnHomeBehavior < DOUBLE_TAP_HOME_NOTHING ||
                mDoubleTapOnHomeBehavior > DOUBLE_TAP_HOME_RECENT_SYSTEM_UI) {
            mDoubleTapOnHomeBehavior = LONG_PRESS_HOME_NOTHING;
        }

        mShortPressOnWindowBehavior = SHORT_PRESS_WINDOW_NOTHING;
        if (mContext.getPackageManager().hasSystemFeature(FEATURE_PICTURE_IN_PICTURE)) {
            mShortPressOnWindowBehavior = SHORT_PRESS_WINDOW_PICTURE_IN_PICTURE;
        }

        mNavBarOpacityMode = res.getInteger(
                com.android.internal.R.integer.config_navBarOpacityMode);
    }

3、修改后的方法：

    private void readConfigurationDependentBehaviors() {
        final Resources res = mContext.getResources();

        mLongPressOnHomeBehavior = res.getInteger(
                com.android.internal.R.integer.config_longPressOnHomeBehavior);
        if (mLongPressOnHomeBehavior < LONG_PRESS_HOME_NOTHING ||
                mLongPressOnHomeBehavior > LAST_LONG_PRESS_HOME_BEHAVIOR) {
            mLongPressOnHomeBehavior = LONG_PRESS_HOME_NOTHING;
        }
           mLongPressOnHomeBehavior= LONG_PRESS_HOME_NOTHING; //其实只加了这句话，强制赋值达到目的
         Log.w(TAG,"LongPress : "+mLongPressOnHomeBehavior);

        mDoubleTapOnHomeBehavior = res.getInteger(
                com.android.internal.R.integer.config_doubleTapOnHomeBehavior);
        if (mDoubleTapOnHomeBehavior < DOUBLE_TAP_HOME_NOTHING ||
                mDoubleTapOnHomeBehavior > DOUBLE_TAP_HOME_RECENT_SYSTEM_UI) {
            mDoubleTapOnHomeBehavior = LONG_PRESS_HOME_NOTHING;
        }

        mShortPressOnWindowBehavior = SHORT_PRESS_WINDOW_NOTHING;
        if (mContext.getPackageManager().hasSystemFeature(FEATURE_PICTURE_IN_PICTURE)) {
            mShortPressOnWindowBehavior = SHORT_PRESS_WINDOW_PICTURE_IN_PICTURE;
        }

        mNavBarOpacityMode = res.getInteger(
                com.android.internal.R.integer.config_navBarOpacityMode);
    }

对应的XML文件的路径及其相应代码：\frameworks\base\core\res\res\values\config.xml

   
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PS:

有人可能会有疑问，为什么不能通过直接修改xml中的属性来达到目的，这是因为直接修改xml文件，系统会自动默认还原回去，这样设置无效。
包括power键等都可以通过修改该java文件来达到目的，双击也一样