三级联动

1.demo.xml布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="小区"
        android:textColor="#000000" />

    <Spinner
        android:id="@+id/sheng"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="楼号+单元号"
        android:textColor="#000000" />

    <Spinner
        android:id="@+id/shi"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="房号"
        android:textColor="#000000" />

    <Spinner
        android:id="@+id/xian"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/t_v"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</LinearLayout>

2.MainActivity.java文件

public class MainActivity extends AppCompatActivity {

    Spinner s_sheng;
    ArrayAdapter<String> adapter_sheng;
    ArrayAdapter<String> adapter_shi;
    ArrayAdapter<String> adapter_xian;
    Spinner s_shi;
    Spinner s_xian;
    int sheng_postion;
    int shi_postion;
    String seletced_sheng;
    String seletced_shi;
    String seletced_xian;
    TextView t_v;
    String[] arr_sheng = {"A小区", "B小区", "C小区", "D小区", "E小区", "F小区", "G小区"};
    String[][] arr_shi = new String[][]{
            {"1号楼1单元", "1号楼2单元", "1号楼3单元"},
            {"2号楼1单元", "2号楼2单元", "2号楼3单元"},
            {"3号楼1单元", "3号楼2单元", "3号楼3单元"},
            {"4号楼1单元", "4号楼2单元", "4号楼3单元"},
            {"5号楼1单元", "5号楼2单元", "5号楼3单元"},
            {"6号楼1单元", "6号楼2单元", "6号楼3单元"},
            {"7号楼1单元", "7号楼2单元", "7号楼3单元"},           　　　　　　{"8号楼1单元", "8号楼2单元", "8号楼3单元"}    };    String[][][] arr_xian = new String[][][]{          
  {//                
    {"0101", "0102", "0103", "0104"}            },          
  {//                    {"0201", "0202", "0203", "0204"}            },         
   {//                    {"0301", "0302", "0303", "0304"}            },       
     {//                    {"0401", "0402", "0403", "0404"}            },         
   {//                    {"0501", "0502", "0503", "0504"}            },         
   {//                    {"0601", "0602", "0603", "0604"}            },      
      {//                    {"0701", "0702", "0703", "0704"}            },       
     {//                    {"0801", "0802", "0803", "0804"}            }   
 }; 
   @Override    
public void onCreate(@Nullable Bundle savedInstanceState) {     
   super.onCreate(savedInstanceState);      
  View rootView = View.inflate(this, R.layout.demo, null);     
   setContentView(rootView);    
    t_v = (TextView) findViewById(R.id.t_v); 
       s_sheng = (Spinner) findViewById(R.id.sheng);  
      s_shi = (Spinner) findViewById(R.id.shi);   
     s_xian = (Spinner) findViewById(R.id.xian); 
       adapter_sheng = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, arr_sheng); 
       adapter_shi = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, arr_shi[0]);     
   adapter_xian = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, arr_xian[0][0]);   
     s_sheng.setAdapter(adapter_sheng);     
   s_sheng.setSelection(0);      
  s_shi.setAdapter(adapter_shi);    
    s_shi.setSelection(0);      
  s_xian.setAdapter(adapter_xian);  
      s_xian.setSelection(0);  
      s_sheng.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {    
        @Override        
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {      
          Log.e("AAAAAAAAAAAA   ", sheng_postion + "       " + i);             
   sheng_postion = i;            
    adapter_shi = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_dropdown_item, arr_shi[i]);     
           s_shi.setAdapter(adapter_shi);         
       seletced_sheng = arr_sheng[i];     
       }           
 @Override    
        public void onNothingSelected(AdapterView<?> parent) {            }        });    
    s_shi.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {   
        @Override       
     public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {//           
     shi_postion = i;           
     adapter_xian = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_spinner_dropdown_item, arr_xian[sheng_postion][shi_postion]);   
             s_xian.setAdapter(adapter_xian);           
     seletced_shi = arr_shi[sheng_postion][i];         
   }          
  @Override       
     public void onNothingSelected(AdapterView<?> parent) {            }        });     
   s_xian.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {      
      @Override     
       public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {      
          seletced_xian = arr_xian[sheng_postion][shi_postion][i];          
      t_v.setText(seletced_sheng + "-" + seletced_shi + "-" + seletced_xian);     
       }         
   @Override    
        public void onNothingSelected(AdapterView<?> parent) {            }        });    }}