http://tonyyu.iteye.com/blog/671297
方法1：
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public Point getDisplayMetrics() {
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DisplayMetrics dm = new DisplayMetrics();
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dm = getApplicationContext().getResources().getDisplayMetrics();
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int screenWidth = dm.widthPixels;
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int screenHeight = dm.heightPixels;
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return new Point(screenWidth ,screenHeight );
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}
方法2：
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public Point getDisplayScreen() {
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WindowManager windowManager = getWindowManager();
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Display display = windowManager.getDefaultDisplay();
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screenWidth = display.getWidth();
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screenHeight = display.getHeight();
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return new Point(screenWidth ,screenHeight );
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}
2种方法都可以获取当前display的screen尺寸。
