Android 获取屏幕的dpi 的方法

public  class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState){
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        DisplayMetrics dm = new DisplayMetrics();
        getWindowManager().getDefaultDisplay().getMetrics(dm);
        int dpi = (int) (dm.density*160);
        Log.e("------------dpi", String.valueOf(dpi));
        
    }

}