Android Studio2.3版本可以直接用一个按钮来查找城市

1：在build.gradle里面添加

allprojects{
    repositories{
        jcenter()
        maven { url "https://jitpack.io" }
    }
}

在dependencies里面添加：compile 'com.github.yekh:CityPicker:v1.0.0'

2：布局一个按钮：

<Button
    android:id="@+id/button"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="选择城市"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

3：在main类里面找到控件id，然后点击事件：

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
  button= (Button) findViewById(R.id.button);

    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            CityListActivity.startCityActivityForResult(MainActivity.this);
        }
    });

}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode==CityListActivity.REQUEST_CODE&&resultCode==CityListActivity.RESULT_CODE){
    String cituName=data.getStringExtra(CityListActivity.RESULT_KEY);
     button.setText(cituName);
    }
}

完成！