Android屏蔽home键

在activity中加上下面这段代码就可以屏蔽home

@Override
	public boolean onKeyDown(int keyCode, KeyEvent event)
	{
		// TODO Auto-generated method stub
		// 按下键盘上返回按钮

		if (keyCode == KeyEvent.KEYCODE_HOME)
		{
                        Log.i("TAG","home");
			System.exit(0);
			return true;
		}
		else
			return super.onKeyDown(keyCode, event);

	}

 

前提是，要重写onAttachedToWindow()这个方法。

 

@Override
	public void onAttachedToWindow()
	{
		this.getWindow().setType(WindowManager.LayoutParams.TYPE_KEYGUARD_DIALOG);
		super.onAttachedToWindow();
	}

 

 

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;
                    }
                }
            }

 注意，activity中重写onAttachedToWindow（）方法需要api 5以上

 

附API Level对照表

Android 2.3 - API Level 9

   

            2.2 - 8

 

            2.1 - 7

 

            2..0.1 - 6

 

            2.0 - 5

 

            1.6 - 4

 

            1.5 -3

 

            1.1 - 2