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  • android 屏蔽home键操作

    1 重写onAttachedToWindow

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

    2 重写onKeyDown

    public boolean onKeyDown(int keyCode, KeyEvent event) {  
    switch (keyCode) {
    case KeyEvent.KeyEvent.KEYCODE_HOME:
    Log.i(TAG,"KEYCODE_HOME");
    return true;
    }
    return super.onKeyDown(keyCode, event);
    }



    3 android源码 

    因为android系统自己对home键在PhoneWindowManager中做了处理,不会返回到上层应用。查看源代码:

    \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;
    }
    }
    }

    4 Dialog

    如果在Activity弹出dialog,在Activity设置以上2个方法是没办法屏蔽的。 
    其实,原理是一样的,只是地方不一样而已。 

    final Dialog dialog = new Dialog(this);  
    dialog.setContentView(R.layout.mydailog);
    dialog.show(); //show应在setType之前,否则报错
    dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD);

    dialog.setOnKeyListener(new android.content.DialogInterface.OnKeyListener(){
    @Override
    public boolean onKey(DialogInterface dialog, int keyCode,KeyEvent event) {
    switch (keyCode) {
    case KeyEvent.KEYCODE_HOME:
    Log.i(TAG,"KEYCODE_HOME");
    return true;
    }
    return false;
    }
    });

    参考:

    dialog,activity 屏蔽Home键详解

    WindowManager.LayoutParams

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  • 原文地址:https://www.cnblogs.com/myparamita/p/2228054.html
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