Android 5.0 屏蔽Home键

来源：互联网发布：山东数据共享交换平台编辑：程序博客网时间：2024/05/02 17:56

最近项目有这样的需要所以研究了一下着块的内容.....刚开始在度娘了一大堆要么支持2.3之前的要么是...反正都是这个复制那个没么卵用的办法..

我想先说明一点想在应用上彻底屏蔽Home是不可能,要想屏蔽只能去改系统源码。好了,下面就看是怎么改的

首先改第一处:源码位置在frameworks\base\services\core\java\com\android\server\wm\WindowManagerService.java

relayoutWindow方法中找到这一段

if (attrs != null) {
if (win.mAttrs.type != attrs.type) {
Slog.e(TAG, "Window : " + win + "changes the window type!!");
Slog.e(TAG, "Original type : " + win.mAttrs.type);
Slog.e(TAG, "Changed type : " + attrs.type);
throw new IllegalArgumentException(
"Window type can not be changed after the window is added.");
}

百度上有一种方法是复写

@Override
public void onAttachedToWindow() {
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
super.onAttachedToWindow();

}

这种方法原来的确是可以的,但是由于安全方面的原因，google已经屏蔽这个方法了，一用就会报错,要想不会报错，我们就要注释掉这里

接下来修改第二处:源码位置在frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java

在interceptKeyBeforeDispatching方法找到if (keyCode == KeyEvent.KEYCODE_HOME)时的处理

if (keyCode == KeyEvent.KEYCODE_HOME) {
// If we have released the home key, and didn't do anything else
// while it was pressed, then it is time to go home!
if (!down) {
cancelPreloadRecentApps();
mHomePressed = false;
if (mHomeConsumed) {
mHomeConsumed = false;
return -1;
}
if (canceled) {
Log.i(TAG, "Ignoring HOME; event canceled.");
return -1;
}
// Delay handling home if a double-tap is possible.
if (mDoubleTapOnHomeBehavior != DOUBLE_TAP_HOME_NOTHING) {
mHandler.removeCallbacks(mHomeDoubleTapTimeoutRunnable); // just in case
mHomeDoubleTapPending = true;
mHandler.postDelayed(mHomeDoubleTapTimeoutRunnable,
ViewConfiguration.getDoubleTapTimeout());
return -1;
}
handleShortPressOnHome();
return -1;
}

WindowManager.LayoutParams attrs = win != null ? win.getAttrs() : null;
if (attrs != null) {
final int type = attrs.type;
if (type == WindowManager.LayoutParams.TYPE_KEYGUARD_SCRIM
|| type == WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG
|| (attrs.privateFlags & PRIVATE_FLAG_KEYGUARD) != 0) {
// the "app" is keyguard, so give it the key
return 0;
}
final int typeCount = WINDOW_TYPES_WHERE_HOME_DOESNT_WORK.length;
for (int i=0; i<typeCount; i++) {
if (type == WINDOW_TYPES_WHERE_HOME_DOESNT_WORK[i]) {
// don't do anything, but also don't pass it to the app
return -1;
}
}
}

看到这段系统会先判断窗口的类型，然后再通过handleShortPressOnHome();这个方法去返回到桌面,这就好办了，我们刚第一步已经把

WindowManager.LayoutParams.TYPE_KEYGUARD这个类型给开放出来了..只需要加个标记去判断要不要返回到主界面就可以了,这样子改

1：首先加个是否回到桌面的标记

2：加个类型判断当时这个类型时我们让标记为false

3：在要返回桌面的方法进行判断

到此位置我们源码的改动就完成了，最后上层要用的话只需要在要屏蔽Home键的当前Activity中复写onAttachedToWindow跟onKeyDown

并可以再onKeyDowm中干我们想干的事，什么都不干return true就可以了

@Override
public void onAttachedToWindow() {
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
super.onAttachedToWindow();

}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {

if(keyCode==KeyEvent.KEYCODE_HOME){
   //干自己的事情
return true;
}
else {
return super.onKeyDown(keyCode, event);
}
}

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