public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        Button go = (Button) findViewById(R.id.go);        final TextView tvResult = (TextView) findViewById(R.id.tv_result);        go.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                CityPicker cityPicker = new CityPicker.Builder(MainActivity.this).textSize(20)                        .textColor(Color.parseColor("#000000"))                        .provinceCyclic(true)                        .cityCyclic(false)                        .districtCyclic(false)                        .visibleItemsCount(7)                        .itemPadding(10)                        .build();                cityPicker.show();                cityPicker.setOnCityItemClickListener(new CityPicker.OnCityItemClickListener() {                    @Override                    public void onSelected(String... citySelected) {                        tvResult.setText("选择结果：\n省：" + citySelected[0] + "\n市：" + citySelected[1] + "\n区："                                + citySelected[2] + "\n邮编：" + citySelected[3]);                    }                });            }        });    }}

 compile 'liji.library.dev:citypickerview:0.3.0'