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@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main);//获取屏幕的长度和宽度DisplayMetrics dm = new DisplayMetrics();getWindowManager().getDefaultDisplay().getMetrics(dm);int width = dm.widthPixels;int heigh = dm.heightPixels;Dialog d = new Dialog(this);d.setTitle(width + "*" + heigh);d.show(); }