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

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();
	}