可以使用类DisplayMetrics来获取屏幕尺寸：
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
Log.i("ClockFrog", "widthPixels: " + metrics.widthPixels);
Log.i("ClockFrog", "heightPixels: " + metrics.heightPixels);
Log.i("ClockFrog", "density: " + metrics.density);
Log.i("ClockFrog", "densityDpi: " + metrics.densityDpi);
Log.i("ClockFrog", "widthDpi: " + metrics.widthPixels/metrics.density);
Log.i("ClockFrog", "heightDpi: " + metrics.heightPixels/metrics.density);
}
最终数据为：
02-01 18:17:21.868 23731-23731/com.nd.sample I/ClockFrog: widthPixels: 2560
02-01 18:17:21.868 23731-23731/com.nd.sample I/ClockFrog: heightPixels: 1600
02-01 18:17:21.869 23731-23731/com.nd.sample I/ClockFrog: density: 2.0
02-01 18:17:21.869 23731-23731/com.nd.sample I/ClockFrog: densityDpi: 320
02-01 18:17:21.869 23731-23731/com.nd.sample I/ClockFrog: widthDpi: 1280.0
02-01 18:17:21.869 23731-23731/com.nd.sample I/ClockFrog: heightDpi: 800.0
分别对应于：
| 名称 | 值 |
|---|---|
| 屏幕宽度 | 2560 |
| 屏幕高度 | 1600 |
| 屏幕密度 | 2.0 |
| 像素密度 | 320 |
| 像素宽度 | 1280.0 |
| 像素高度 | 800.0 |
