Android 全屏底部Dialog
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dialog_share);
Window window = this.getWindow();
window.setGravity(Gravity.BOTTOM);
WindowManager.LayoutParams params = window.getAttributes();
params.width = WindowManager.LayoutParams.MATCH_PARENT;
params.height = WindowManager.LayoutParams.WRAP_CONTENT;
window.setAttributes(params);
initView();
}