Activity设置为对话框属性时（Theme.Dialog）时，改变其在屏幕中的位置

原帖http://stackoverflow.com/questions/2163427/android-dialog-activity-position

如果有需要要将Activity变成一个窗口形式（在Manifest.xml中的activity标签设置android:theme="@android:style/Theme.Dialog"属性），默认Activity窗口弹出是在屏幕的正中央。通过覆写Activity中onAttachedToWindow()方法，在期中将DecorView的参数重设一下就可以指定其显示的位置了。

@Overridepublic void onAttachedToWindow() {    super.onAttachedToWindow();    View view = getWindow().getDecorView();    WindowManager.LayoutParams lp = (WindowManager.LayoutParams) view.getLayoutParams();    lp.gravity = Gravity.LEFT | Gravity.TOP;    lp.x = 10;    lp.y = 10;    lp.width = 300;    lp.height = 300;    getWindowManager().updateViewLayout(view, lp);}

lp.x , lp.y , lp.width ,lp.height的具体值可以定义到res/values/dimens.xml中，方便以后修改。

@Override    public void onAttachedToWindow() {        // 设置本Activity在父窗口的位置        super.onAttachedToWindow();        View view = getWindow().getDecorView();        WindowManager.LayoutParams lp = (WindowManager.LayoutParams) view                .getLayoutParams();        lp.gravity = Gravity.RIGHT | Gravity.BOTTOM;        lp.x = getResources().getDimensionPixelSize(                R.dimen.playqueue_dialog_marginright);        lp.y = getResources().getDimensionPixelSize(                R.dimen.playqueue_dialog_marginbottom);        lp.width = getResources().getDimensionPixelSize(                R.dimen.playqueue_dialog_width);        lp.height = getResources().getDimensionPixelSize(                R.dimen.playqueue_dialog_height);        getWindowManager().updateViewLayout(view, lp);    }

 <resources> <dimen name="playqueue_dialog_marginright">0dp</dimen>    <dimen name="playqueue_dialog_marginbottom">60dp</dimen>    <dimen name="playqueue_dialog_width">250dp</dimen>    <dimen name="playqueue_dialog_height">380dp</dimen>    <dimen name="playqueue_dialog_select_item_from_top">90dp</dimen></resources>

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