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Window window = getWindow();
requestWindowFeature(Window.FEATURE_NO_TITLE);
if (window != null) {
window.getDecorView().setPadding(0, 0, 0, 0);
//很重要 window.setBackgroundDrawableResource(android.R.color.transparent);
WindowManager.LayoutParams params = window.getAttributes();
params.width = ViewGroup.LayoutParams.MATCH_PARENT;
params.height = ViewGroup.LayoutParams.MATCH_PARENT;
window.setAttributes(params);
}