android dialog怎么禁止home键 android 弹出对话框后如何禁止回退
\u5982\u4f55\u4f7fdialog\u5c4f\u853dhome\u952e\u7528AlertDialog\u6216AlertDialog.Builder\u4e2d\u7684 setCancelable(boolean flag) \u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u662f\u7528\u6765\u8bbe\u7f6e\u7981\u6b62back\u952e\u53d6\u6d88\u5bf9\u8bdd\u6846\u7684
\u7528AlertDialog\u6216AlertDialog.Builder\u4e2d\u7684 setCancelable(boolean flag) \u65b9\u6cd5\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u662f\u7528\u6765\u8bbe\u7f6e\u7981\u6b62back\u952e\u53d6\u6d88\u5bf9\u8bdd\u6846\u7684
近日在研究一个视频锁的功能，即在 视频播放界面上设一个锁的功能，当该锁起效后，就会屏蔽back, home, menu三个键的功能。 back 和 menu 键都可以通过 app层 的 onKeyDown 和 onKeyUp 函数来拦截。但是 home 键不行。 于是上网查了一下在app层屏蔽 home 键的方法。 主流的方法如下所示。但只在2.2，2.3平台下有效。（下面列举的方法只在android 2.2, 2.3 上有效） 屏蔽Activity, Dialog风格Activity, AlertDialog的Home键功能方法分别是: 1.屏蔽Activity中的Home键功能，只需要在你要屏蔽的activity 中重写 onAttachToWindow() 这个函数就可以了 [java] @Override public void onAttachedToWindow() { this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD); super.onAttachedToWindow(); } @Override public void onAttachedToWindow() { this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD); super.onAttachedToWindow(); } 2.屏蔽 Dialog风格Activity的Home键功能，也需要在你要屏蔽的activity 中重写 onAttachToWindow() 这个函数，但设置window 的值需要改变为 TYPE_KEYGUARD_DIALOG [java] @Override public void onAttachedToWindow() { this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG); super.onAttachedToWindow(); } @Override public void onAttachedToWindow() { this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG); super.onAttachedToWindow(); } 这里之所以和Activity区分,是因为Dialog风格Activity如果用第一种方法,这个Dialog风格Activity的背景就变成黑色的,而不是透明的. 3.屏蔽AlertDialog的Home键功能 [java] AlertDialog d = b.create(); d.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); AlertDialog d = b.create(); d.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT); 后面通过上面一篇文章的思路来看 4.0平台的 framework 层的代码，发现在 PhoneWindowManager.java 的 interceptKeyBeforeDispatching 函数中对home键的处理如下： [java] 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 (mHomePressed && !down) { mHomePressed = false; .. } // 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; } } final int flag = attrs.flags; if ((flag & WindowManager.LayoutParams.FLAG_HOMEKEY_DISPATCHED) != 0) { // the window wants to handle the home key, so dispatch it to it. return 0; } } return -1; 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 (mHomePressed && !down) { mHomePressed = false; ...... } // 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; } } final int flag = attrs.flags; if ((flag & WindowManager.LayoutParams.FLAG_HOMEKEY_DISPATCHED) != 0) { // the window wants to handle the home key, so dispatch it to it. return 0; } } return -1; } 在此函数中，如果返回 0，则 home 键会交给 app 来处理，如果返回 -1 ，则不会处理 home 键。 在app 的你要屏蔽home 键的activity 中，只需要添加该标志就可以了 getWindow().addFlags(WindowManager.LayoutParams.FLAG_HOMEKEY_DISPATCHED); 如果要使home 键有效，再 clearFlags 即可。 getWindow().clearFlags(WindowManager.LayoutParams.FLAG_HOMEKEY_DISPATCHED); 从上面的代码来看，应该设置 window 的类型也是有效的，但不知为何在 4.0 中不取作用，打Log 看也不取效。不知何故。 this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD); 作者：fulinwsuafcie扩展阅读：android苹果版下载 ... javascript&jquery ... android下载安装app ... steam workshop18 ... android wear ... java properties ... java webservice ... apple日本网站 ... android app store china ...
