android home按键拦截

home按键默认现在没法屏蔽，但是mtk由于特殊需要，需要拦截home按键，于是添加了一套机制实现。

1：在alps\frameworks\base\core\java\android\view WindowManager.java

里面添加一个属性
/** M: Window flag: When this flag is set, the home key can be dispatched
* to the window.
* {@hide} */
public static final int FLAG_HOMEKEY_DISPATCHED = 0x80000000;

2：在 alps\frameworks\base\policy\src\com\android\internal\policy\impl PhoneWindowManager.java
里面的
public long interceptKeyBeforeDispatching(WindowState win, KeyEvent event, int policyFlags) {
接口里面，添加
if (keyCode == KeyEvent.KEYCODE_HOME) {
/// M: [ALPS00054781]Dispatch the home key to the application @{
if (win != null && win.getAttrs() != null) {
final int flag = win.getAttrs().flags;
if ((flag & WindowManager.LayoutParams.FLAG_HOMEKEY_DISPATCHED) != 0) {
// the window wants to handle the home key, so dispatch it to it.
return 0;
}
}

通过这里来拦截home按键
3：如果需要app拦截
在 activity 的 onCreate 里面增加
getWindow().addFlags(FLAG_HOMEKEY_DISPATCHED);

即可。

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