android 4.0 屏蔽 HOME_KEY 和 RECENT_APP_KEY

在项目中需要屏蔽虚拟按键，back 和menu键可以屏蔽，但是HOME_KEY 和 RECENT_APP_KEY 却无法屏蔽，在 onKeyDown(int keyCode, KeyEvent event) 方法中不能捕获HOME_KEY 和 RECENT_APP_KEY 的动作。

1、屏蔽HOME_KEY

参考网站http://www.2cto.com/kf/201207/138886.html

在/frameworks/base/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java(拦截消息的处理类) 

的interceptKeyBeforeDispatching() 方法中做修改

public static final int FLAG_HOMEKEY_DISPATCHED = 0x80000000;

// 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 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;
}
}

//以下条件屏蔽HOMEKEY
final int flag = attrs.flags;
if ((flag & FLAG_HOMEKEY_DISPATCHED) != 0){
Log.i(TAG, "============ FLAG_HOMEKEY_DISPATCHED");
return 0;
}
}

在应用中设置以下代码

public static final int FLAG_HOMEKEY_DISPATCHED = 0x80000000;public void onAttachedToWindow() {
getWindow().addFlags(FLAG_HOMEKEY_DISPATCHED);
super.onAttachedToWindow();
}

并在onKeyDown(int keyCode, KeyEvent event) 中返回true。屏蔽了HOME键。

2、屏蔽RECENT_APP_KEY

在PhoneWindowManager.java(拦截消息的处理类) 的interceptKeyBeforeDispatching() 方法中，RECENT_APP_KEY的事件不能截取。屏蔽RECENT_APP_KEY只能另想办法。

参考http://blog.csdn.net/yihongyuelan/article/details/7623578

在/frameworks/base/packages/SystemUI 中的TabletStatusBar.java （平板的StatusBar）。发现在类中存在一个广播类，添加一个屏蔽的动作和一个取消屏蔽的动作。达到通过广播去控制recentApp的动作是否响应。

protected View makeStatusBarView() {
...
...
// receive broadcasts
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);
filter.addAction(Intent.ACTION_SCREEN_OFF);
//增加开关动作
filter.addAction(ACTION_DISABLE_RECENT_BUTTON);
filter.addAction(ACTION_ENABLE_RECENT_BUTTON);
context.registerReceiver(mBroadcastReceiver, filter);

return sb;
}
private boolean disableRecentButton = false;
private static final String ACTION_DISABLE_RECENT_BUTTON = "action_disable_recent_button";
private static final String ACTION_ENABLE_RECENT_BUTTON = "action_enable_recent_button";

private View.OnClickListener mOnClickListener = new View.OnClickListener() {
public void onClick(View v) {
if (v == mRecentButton) {
if (!disableRecentButton) {
//recentApp 动作处理
onClickRecentButton();
}
} else if (v == mInputMethodSwitchButton) {
onClickInputMethodSwitchButton();
} else if (v == mCompatModeButton) {
onClickCompatModeButton();
}
}
};

private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {
public void onReceive(Context context, Intent intent) {
String action = intent.getAction();
if (Intent.ACTION_CLOSE_SYSTEM_DIALOGS.equals(action)
|| Intent.ACTION_SCREEN_OFF.equals(action)) {
boolean excludeRecents = false;
if (Intent.ACTION_CLOSE_SYSTEM_DIALOGS.equals(action)) {
String reason = intent.getStringExtra("reason");
if (reason != null) {
excludeRecents = reason.equals("recentapps");
}
}
if (Intent.ACTION_SCREEN_OFF.equals(action)) {
// If we're turning the screen off, we want to hide the
// recents panel with no animation
// TODO: hide other things, like the notification tray,
// with no animation as well
mRecentsPanel.show(false, false);
excludeRecents = true;
}
animateCollapse(excludeRecents);
}
//增加开关动作
else if (ACTION_DISABLE_RECENT_BUTTON.equals(action)){
disableRecentButton = true;
} else if (ACTION_ENABLE_RECENT_BUTTON.equals(action)){
disableRecentButton = false;
}
}
};

最后在应用中添加以下代码就可以屏蔽了RECNET_APP_KEY

private static final String ACTION_DISABLE_RECENT_BUTTON = "action_disable_recent_button";
private static final String ACTION_ENABLE_RECENT_BUTTON = "action_enable_recent_button";

@Override
protected void onResume() {
super.onResume();
Intent intent = new Intent(ACTION_DISABLE_RECENT_BUTTON);
sendBroadcast(intent);
}

@Override
protected void onPause() {
Intent intent = new Intent(ACTION_ENABLE_RECENT_BUTTON);
sendBroadcast(intent);
super.onPause();
}