android 捕获并处理HOME键

最新推荐文章于 2024-03-24 22:13:34 发布

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最新推荐文章于 2024-03-24 22:13:34 发布

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分类专栏： android 捕获并处理HOME键文章标签： windowmanager home

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本文介绍了如何在Android应用中通过重写onAttachedToWindow()方法来屏蔽Home键，利用系统源码中的特殊处理机制，使得应用在特定情况下无法通过Home键返回。此方法适用于API等级5以上的应用。

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1. 在activity中加上这段代码就可以屏蔽home键（onKeyDown事件会捕捉到home键）。

public void onAttachedToWindow()
{
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
super.onAttachedToWindow();
}
public void onAttachedToWindow()
{
this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);
super.onAttachedToWindow();
} 2.因为android系统自己对与home键power键在PhoneWindowManager中做了处理，不会返回到上层应用的。以下为系统源码：
\frameworks\policies\base\phone\com\android\internal\policy\impl\PhoneWindowManager.java 1089行

if (code == KeyEvent.KEYCODE_HOME) {

// If a system window has focus, then it doesn't make sense
// right now to interact with applications.
WindowManager.LayoutParams attrs = win != null ? win.getAttrs() : null;
if (attrs != null) {
final int type = attrs.type;
if (type == WindowManager.LayoutParams.TYPE_KEYGUARD
|| type == WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG) {
// the "app" is keyguard, so give it the key
return false;
}
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 true;
}
}
}
\frameworks\policies\base\phone\com\android\internal\policy\impl\PhoneWindowManager.java 1089行

if (code == KeyEvent.KEYCODE_HOME) {

// If a system window has focus, then it doesn't make sense
// right now to interact with applications.
WindowManager.LayoutParams attrs = win != null ? win.getAttrs() : null;
if (attrs != null) {
final int type = attrs.type;
if (type == WindowManager.LayoutParams.TYPE_KEYGUARD
|| type == WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG) {
// the "app" is keyguard, so give it the key
return false;
}
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 true;
}
}
}

type == WindowManager.LayoutParams.TYPE_KEYGUARD这一句，我们可以看到，android对于锁屏特殊判断了，所以我就模拟这个进行的实现，只是有一点，activity中重写onAttachedToWindow（）方法需要api 5以上。

摘自 xiaoxiaobian3310903的专栏